JP2011247548A - Snow air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a snow air conditioning system that prevents shortage of heat exchange capacity of a heat exchanger at the peak of a load.SOLUTION: A heat storage tank 13 is provided to circulate a heat medium 4 through a high-temperature side heat storage tank 16, a first heat exchanger 5, and a low-temperature side heat storage tank 15, so that cold heat of the heat medium 4 is stored in the low-temperature side heat storage tank 15. By using the cold heat stored in the low-temperature side heat storage tank 15 when a load device 23 is in operation, it is possible to compensate for the shortage of heat exchange capacity of the first heat exchanger 5 for the load variation at the peak. Consequently, even when the first heat exchanger 5 cannot secure the heat exchange capacity for the load variation at the peak, the shortage of heat exchange capacity for the system can be prevented.

Description

  The present invention relates to a snow air-conditioning system that performs cooling by using the cold heat of a stored snow melt.

  2. Description of the Related Art A snow air conditioning system that stores snow in winter in a snow storage tank and cools it in summer using the cold heat of the melted snow stored in the snow storage tank is known (see, for example, Patent Document 1). ). Such a snow air-conditioning system is attracting attention as an effective countermeasure against global warming in snowy areas, because it uses natural snow and does not emit greenhouse gases.

JP 2005-299944 A

  In the conventional snow air-conditioning system, it is necessary to select a heat exchanger having a heat exchange capacity corresponding to the peak load fluctuation as cold heat required by the load device (air conditioner). However, since the heat exchange capacity of the heat exchanger depends on the heat transfer area, in other words, the floor area of the snow storage tank, it is limited by the size of the snow storage tank. Therefore, in the conventional snow air-conditioning system, an extremely high efficiency heat exchanger is necessary to cope with the load fluctuation at the peak time, but such an ultra-high efficiency heat exchanger is not realistic. As a result, in the conventional snow air conditioning system, the load fluctuation at the peak may exceed the capacity of the snow air conditioning system, that is, the heat exchange capacity of the heat exchanger.

  Then, this invention was made | formed in view of the said situation, and it was made as a subject to provide the snow air-conditioning system which can eliminate the shortage of heat exchange capacity | capacitance of the heat exchanger at the time of load peak. .

  In order to solve the above problems, a snow air conditioning system of the present invention is a snow air conditioning system that cools air-conditioning target equipment using the cold heat of melted snow stored in a snow storage tank, and is heated by a load device. A first heat exchanger that makes thermal contact between the heat medium used for the exchange and the molten water stored in the snow storage tank; and the heat medium that is heat-exchanged by the first heat exchanger is stored and the heat A heat storage tank in which heat is stored, a first heat medium path through which the heat medium circulates via the heat storage tank and the first heat exchanger, and the heat medium stored in the heat storage tank directly Alternatively, the heat medium that is brought into thermal contact with the heat medium has a second heat medium path that circulates through the load device.

(Aspect of the Invention)
In the following, aspects of the invention that is recognized as being capable of being claimed in the present application (hereinafter referred to as claimable invention) will be exemplified, and each exemplified aspect will be described. Here, as in the claims, each aspect is divided into paragraphs, numbers are assigned to the respective paragraphs, and the descriptions of other paragraphs are cited as necessary. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combination of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiment, etc., and as long as the interpretation is followed, another aspect is added to the aspect of each section. Moreover, the aspect which deleted the component from the aspect of each term can also be one aspect of the claimable invention.
In the following items, each of the items (1) to (9) corresponds to each of claims 1 to 9 described in the claims.

(1) A snow air-conditioning system that cools the air-conditioning target equipment using the cold heat of the melted snow stored in the snow storage tank, and is stored in the heat storage medium used for heat exchange with the load device and the snow storage tank. A first heat exchanger for bringing the molten water into thermal contact, a heat storage tank in which the heat medium exchanged by the first heat exchanger is stored and the heat is stored, and the heat medium is the heat storage tank and the first heat The first heat medium path circulating through the exchanger and the heat medium stored in the heat storage tank directly or through the load device circulates the heat medium in thermal contact with the heat medium. A snow air conditioning system having a second heat medium path.
According to the system of this section, a heat storage tank is provided to constitute a snow air conditioning system, and the heat medium circulates in the first heat medium path via the heat storage tank and the first heat exchanger. Thereby, the cold energy of the heat medium heat-exchanged with the 1st heat exchanger is stored in a heat storage tank. The heat medium circulates in the second heat medium path via the heat storage tank and the load device. Thus, in this system, for example, by circulating the heat medium in the first heat medium path in a 24-hour operation, the cold heat of the heat medium heat-exchanged by the first heat exchanger is gradually stored in the heat storage tank. Can do. And the lack of the heat exchange capacity of the 1st heat exchanger with respect to the load fluctuation at the peak can be compensated by using the cold energy stored in the heat storage tank at the time of operation of the load device. Therefore, even if the heat transfer area of the first heat exchanger is limited and the first heat exchanger cannot secure a heat exchange capacity corresponding to the load fluctuation at the peak time, the system As a result, it is possible to prevent the heat exchange capacity from being insufficient. In addition, in the system of this term, bringing into thermal contact with the melted water stored in the snow storage tank includes bringing it into thermal contact with snow ice stored in the snow storage tank.
In the system of this section, it is desirable to set the heat exchange capacity of the first heat exchanger to the maximum and to set the heat storage capacity of the heat storage tank to the minimum necessary. Thereby, the initial introduction cost of a thermal storage tank can be suppressed to the minimum.
In the system of this section, the snow storage tank has, for example, a basic structure including a bottom part of a reinforced concrete structure and a steel structure built on the bottom part, and six surfaces of this structure are insulated with a thickness of 100 to 150 mm. The outer wall can be covered with a galvalume steel plate, and the roof can be made of a folded roof plate. In addition, about the part where waterproofness and corrosion resistance are required, such as a part which stores molten water, it is set as the structure where the required performance is ensured.
In the system of this section, the first heat exchanger is made of, for example, pipes (for example, bridged polypipes) laid at intervals of 50 to 100 mm on the bottom of the snow storage tank with protective concrete or submerged asphalt having a thickness of 50 to 100 mm. It can be configured by covering. Of the pipes constituting the first heat medium path, a pipe extending from the first heat exchanger to the heat storage tank, that is, a pipe for sending the heat medium cooled by the first heat exchanger to the heat storage tank (first forward path) Can be constructed using a pipe made of vinyl chloride (HIVP) whose outer periphery is covered with a heat insulating material such as foaming resin, etc., but a stainless steel pipe whose outer periphery is covered with a heat insulating material such as foaming resin It is desirable to adopt.

(2) a molten water tank in which the molten water overflowing the snow storage tank is stored, a second heat exchanger that makes thermal contact between the molten water stored in the molten water tank and the heat medium used for heat exchange in the load device; The snow air conditioning system according to (1).
In the system of this section, the heat medium that is used for heat exchange in the load device and returns to the heat storage tank is cooled by a second heat exchanger that is provided by being submerged in the molten water stored in the molten water tank. In other words, the heat medium that has been heated by the load device and used for heat exchange is introduced into the heat storage tank after being cooled by the second heat exchanger. Thus, in the system of this section, the heat exchange efficiency of the system can be improved by effectively utilizing the sensible heat of the molten water that has overflowed the snow storage tank that has been conventionally treated as waste water.
In the system of this section, the snow stored in the snow storage tank is melted by latent heat and sensible heat being taken away by natural melting and heat exchange in the first heat exchanger. Further, in order to maintain the water level constant, the melted water stored in the snow storage tank is discharged from the overflow pipe and stored in the melting water tank. And the capacity | capacitance of a molten water tank shall be 1 to 2 hours of the amount of molten water discharged | emitted from the overflow pipe | tube in the unit time at the time of a maximum load, for example.

(3) The heat storage tank was used for heat exchange in the low temperature side heat storage tank in which the heat medium exchanged by the first heat exchanger was introduced and the heat medium sent to the load apparatus was stored, and in the load apparatus (1) having a high temperature side heat storage tank in which a heat medium is introduced and a heat medium sent to the first heat exchanger is stored, and a communication path that connects the low temperature side heat storage tank and the high temperature side heat storage tank. (2) Snow air conditioning system.
According to the system of this section, since the heat medium that has been used for heat exchange in the load device and has been heated is introduced into the high-temperature side heat storage tank, the heated heat medium and the heat medium that has been cooled by the first heat exchanger There is no direct thermal contact. Therefore, it can be prevented that the cold heat stored in the low temperature side heat storage tank is taken away by the return heat medium from the load device and the heat exchange efficiency of the system is lowered. In addition, the heat medium pumped up from the high-temperature side heat storage tank, that is, the heat medium used for heat exchange by the load device and heated up and the molten water stored in the snow storage tank are in thermal contact with each other, so The temperature difference with water can be set larger than the temperature difference when the heat medium is in thermal contact when the heat storage tank is one tank. As a result, the heat exchange efficiency in the first heat exchanger is improved. Can be made.
In the system of this section, the heat storage tank does not need to prepare a low temperature side heat storage tank and a high temperature side heat storage tank separately, and the inside of one tank is partitioned by a partition wall having heat insulating properties, and the partition wall is partitioned by the partition wall. Can be a low temperature side heat storage tank and the other can be a high temperature side heat storage tank. In this case, the communication path can be a communication pipe that penetrates the partition wall.
In the system of this section, the temperature of the heat medium stored in the low temperature side heat storage tank is desirably 3 to 4 ° C. Therefore, in the system of this section, a temperature sensor for measuring the temperature of the heat medium stored in the low temperature side heat storage tank is provided, and the temperature of the heat medium in the low temperature side heat storage tank increases to reach, for example, 6 ° C. At that time, the heat medium stored in the low temperature side heat storage tank is lowered by operating the cold water pump and circulating the heat medium in the first heat medium path, and the heat medium in the low temperature side heat storage tank is lowered, for example, 4 When the temperature reaches 0 ° C., the chilled water pump can be stopped to stop the circulation of the heat medium in the first heat medium path.

(4) The first heat exchanger has a plurality of rows of heat transfer tubes laid on the floor of the snow storage tank, and a collecting tube that consolidates the forward side of the plurality of rows of heat transfer tubes is stored in the snow storage tank. The snow air conditioning system according to (2) or (3), wherein a collecting pipe that is submerged in water and aggregates the return sides of the plurality of rows of heat transfer pipes is submerged in the molten water stored in the molten water tank.
In the system in this section, the sensible heat of the molten water stored in the snow storage tank is recovered by submerging the collecting pipe that consolidates the forward (exit) side of the multiple rows of heat transfer tubes in the molten water stored in the snow storage tank. can do. In addition, by collecting the collecting pipe that consolidates the return path (inlet) side of the multiple rows of heat transfer tubes into the molten water stored in the molten water tank, the sensible heat of the molten water stored in the molten water tank can be recovered. it can. Thereby, the heat exchange efficiency of the said system can be improved.

(5) The snow air conditioning system according to any one of (1) to (4), further including first watering means for watering the roof of the snow storage tank, wherein the first watering means uses the molten water overflowed from the molten water tank.
In the system of this section, the melted water sprayed onto the roof of the snow storage tank, particularly the roof that tends to rise in temperature when exposed to sunlight, is melted by the water sprayed onto the roof of the snow storage tank by the first watering means. Can be cooled by the latent heat and sensible heat that accompanies evaporation. Moreover, since the water sprinkled by the 1st watering means reuses the water (melted water) which overflowed from the melting water tank, it suppresses the increase in running cost when compared with the case of watering using clean water. be able to.
In the system of this section, the first watering means has a drainage tank in which the molten water overflowed from the melting water tank is stored, and is configured to sprinkle water (melted water) pumped from the drainage tank by the pump. Can do. In addition, the molten water sprayed on the roof of the snow storage tank by the first watering means can be discharged out of the system by collecting it with a gutter provided along the roof eaves.

(6) It has a snow density adjusting means for adjusting the snow density of the snow stored in the snow storage tank, and the snow density adjusting means has a second watering means for watering the snow stored in the snow storage tank, and the second water spraying means. The snow air conditioning system according to any one of (1) to (5), comprising: air blowing means that blows cold air on the water sprayed by the water spraying means to refreeze the air.
For example, when removing snow with relatively low density that has been removed and left for a certain period of time, the snow density becomes about 0.5 Mg / m ³ due to its own weight. In the system of this section, first, snow is poured in a state where rainwater is accumulated at the bottom of the snow storage tank. The thrown snow becomes sherbet. An ice layer having a constant thickness can be generated at the bottom of the snow storage tank by spraying the sherbet-like snow with cold air below the freezing point at night by air blowing means and refreezing it. Furthermore, snow is thrown in on it with a fixed thickness, and the stored snow is sprinkled by the second watering means. Thereby, the upper part of snow becomes a sherbet shape, and the volume specific gravity of snow is raised. Further, the upper part of the snow is re-frozen by blowing cold air below the freezing point at night to the top of the sprinkled snow by the blowing means. In this manner, in the system of this section, the density of snow stored in the snow storage tank can be increased to about 0.7 to 0.8 Mg / m ³ by repeating watering and refreezing.

(7) The snow air conditioning system according to (5) or (6), having rainwater supply means for storing rainwater and supplying the stored rainwater to the first watering means or the second watering means.
According to the system of this section, an increase in running cost can be suppressed as compared with the case where water is sprayed using clean water. In the system of this section, a rainwater tank for storing rainwater collected during rainfall can be provided separately, but a rainwater tank and a snow storage tank can be used in combination. In this case, a switching valve is provided in a path along which the collected rainwater moves toward the snow storage tank, and the rainwater can be drained as necessary when the amount of rainfall is large.

(8) The snow air conditioning system according to (1) to (7), including a heat pump chiller and a third heat medium path through which the heat medium circulates through the heat pump chiller and the heat storage tank.
In the system in this section, a heat pump chiller can be used as a backup for snow cooling when the peak load fluctuation exceeds the heat exchange capacity of the system or when the snow in the snow storage tank is used up. . Moreover, in the system of this term, the said system can be used as heating by heating the heat medium which circulates through a 3rd heat medium path | route with a heat pump chiller. In addition, although a hot water boiler etc. can be used instead of a heat pump chiller, by using a heat pump chiller, hot water can be obtained using late-night electricity at a low charge, so running costs can be reduced. it can.

(9) The second heat medium path includes a third heat exchanger, a fourth heat medium path through which the heat medium circulates via the third heat exchanger and the heat storage tank, and a heat medium that performs the third heat exchange. A snow air conditioning system according to any one of (1) to (8), further including a fifth heat medium path that circulates through the heater and the load device.
According to the system of this section, the fifth heat medium path can be a closed circuit. Thereby, the corrosion of the pipe which comprises the 5th heat-medium path | route including a load apparatus can be prevented. Moreover, the burden of the pump for pumping a heat medium to a load apparatus can be reduced compared with the aspect of (1) mentioned above. Furthermore, since the heat medium circulating in the fifth heat medium path can be simply water (tap water), it is possible to greatly reduce the amount of antifreeze used as the heat medium, thereby reducing the equipment cost and running cost. Can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the snow air conditioning system which can eliminate the heat exchange capacity shortage of the heat exchanger at the time of load peak can be provided.

1 is a schematic view of a snow air conditioning system according to a first embodiment. It is the schematic of the piping system of the snow air conditioning system which concerns on 1st Embodiment. It is explanatory drawing of the snow storage tank in the snow air conditioning system which concerns on 2nd Embodiment. It is the schematic of the snow air conditioning system which concerns on 3rd Embodiment. It is the schematic of the snow air conditioning system which concerns on 4th Embodiment. It is the schematic of the piping system of the snow air conditioning system which concerns on 4th Embodiment. It is the schematic of the snow air conditioning system which concerns on 5th Embodiment. It is the schematic of the piping system of the snow air conditioning system which concerns on 5th Embodiment.

(First embodiment)
A first embodiment of the present invention will be described with reference to the accompanying drawings. The present snow air conditioning system is a snow cooling system that cools the air-conditioning target equipment by using the cold heat of the melted water 2 of the snow ice 1 stored in the snow storage tank 3. Moreover, the specific numerical value of the temperature of the heat medium 4 to be described later is not intended to be limited to this.
As shown in FIG. 1, the system has a snow storage tank 3 in which snow ice 1 and its melted water 2 are stored. The snow storage tank 3 includes a bottom portion 3a formed of reinforced concrete, a frame of a steel structure constructed on the bottom portion 3a, a roof portion 3b formed of a folded plate, an outer wall formed of a galvalume and an ALC panel, etc. And a heat insulating material that covers all surfaces (six surfaces in the first embodiment). Further, the snow storage tank 3 has an overflow pipe 6 for maintaining the water level of the molten water 2 to be stored constant, and the molten water 2 discharged from the snow storage tank 3 by the overflow pipe 6 has a heat insulating structure. It is collected and stored by the molten water tank 7 having The molten water 2 overflowing the molten water tank 7 is discharged from the molten water tank 7 through the overflow pipe 8 and is collected and stored by the drain tank 10 adjacent to the molten water tank 7 through the partition wall 9.

  As shown in FIG. 1, the bottom 3 a of the snow storage tank 3 is provided with a first heat exchanger 5 that indirectly heat-contacts the heat medium 4 and the melted water 2 (including snow ice 1) of the snow storage tank 3. It is done. The first heat exchanger 5 includes a plurality of rows of heat transfer tubes laid in parallel at predetermined intervals on the bottom portion 3a of the snow storage tank 3, and a protective layer made of concrete or submerged asphalt that covers these heat transfer tubes. Have. A crosslinked poly pipe is used for each heat transfer tube of the first heat exchanger 5. In addition, each heat transfer tube of the first heat exchanger 5 is aggregated at the end on the forward path (exit) side by the header 11 (collection pipe) and at the end on the return path (inlet) side is the header 12 (collection pipe). ). In this system, the forward path header 11 is provided so as to be submerged in the molten water 2 stored in the snow storage tank 3, and the return path header 12 is stored in the molten water tank 7. It is provided to be submerged in water.

  As shown in FIG. 1, the present snow air conditioning system includes a heat storage tank 13 in which a heat medium 4 that circulates the system is stored and heat (cold heat) of the stored heat medium 4 is stored. The heat storage tank 13 has a heat insulating structure, and the inside thereof is divided into a low temperature side heat storage tank 15 and a high temperature side heat storage tank 16 by a partition wall 14. The heat storage tank 13 has a plurality of (two in FIG. 1) communication pipes 17 provided in the partition wall 14 for communicating the low temperature side heat storage tank 15 and the high temperature side heat storage tank 16. In this system, the heat storage capacity of the heat storage tank 13 is set to the minimum necessary by setting the heat exchange capacity of the first heat exchanger 5 to the maximum.

  As shown in FIG. 1, the present snow air-conditioning system has a first watering device (first watering means) that sprays the molten water 2 of the drainage tank 10 onto the roof portion 3 b of the snow storage tank 3. The first watering device extends along one side (the side disposed at the highest position) of the drainage pump 18 that pumps the molten water 2 stored in the drainage tank 10 and is pumped up from the drainage tank 10. The melted water 2 has a first sprinkler pipe 19 through which water is sprinkled from a nozzle, and a water feed pipe 20 extending from the drain pump 18 to the first sprinkler pipe 19. The melted water 2 sprinkled on the roof portion 3a of the snow storage tank 3 by the first watering device is collected by the eaves 21 extending along the other side (side arranged at the lowest position) of the roof portion 3b. It is discharged outside the system. The system is configured such that the melted water 2 stored in the drain tank 10 can be selected to be pumped and drained by the drain pump 18.

  Here, an outline of the piping system of the system will be described. As shown in FIG. 2, the system includes a first heat medium path 22 for circulating the heat medium 4 via the first heat exchanger 5 and the heat storage tank 13, and the heat medium 4 for the heat storage tank 13 and the load. And a second heat medium path 24 that circulates through existing equipment including the device 23. In addition, although the load apparatus 23 (air conditioner) in the said system is a fan coil unit and an air handling unit, in the following description, these are collectively called the load apparatus 23 for convenience in explanation. Moreover, the codes | symbols 29 and 30 in FIG. 1 are the cold heat source and heat source of an existing installation. Of course, the existing facility may be a new facility.

  As shown in FIG. 1, the first heat medium path 22 extends from the header 11 to the low temperature side heat storage tank 15 and sends the heat medium cooled by the first heat exchanger 5 to the low temperature side heat storage tank 15. 25, a first return path 26 that extends from the high temperature side heat storage tank 16 to the header 12 and stores the heat medium 4 stored in the high temperature side heat storage tank 16 to the first heat exchanger 5, and a first return path 26. And a first temperature sensor 28 for monitoring the temperature of the heat medium 4 stored in the low temperature side heat storage tank 15. In the system, based on the measurement result of the first temperature sensor 28, when the heat medium 4 in the low temperature side heat storage tank 15 is heated and reaches 6 ° C., the pump 27 is operated to activate the first heat medium. The temperature of the heat medium in the low temperature side heat storage tank 15 is lowered by circulating the heat medium 4 in the path 22, and when the temperature of the heat medium 4 in the low temperature side heat storage tank 15 is lowered to 4 ° C., the pump 27 is turned on. The temperature of the heat medium 4 in the low temperature side heat storage tank 15 is maintained at 3 to 4 ° C. by stopping the circulation of the heat medium 4 in the first heat medium path 22.

  As shown in FIG. 1, the second heat medium path 24 includes a second forward path 31 that extends from the low temperature side heat storage tank 15 to the load device 23 and sends the heat medium 4 stored in the low temperature side heat storage tank to the load apparatus 23. The second return path 32 that extends from the load device 23 to the high temperature side heat storage tank 16 and that is used for heat exchange in the load apparatus 23 is sent to the high temperature side heat storage tank 16, and the second return path 32 is provided at a low temperature. A pump 33 for pumping up the heat medium 4 stored in the side heat storage tank 15, a second temperature sensor 34 for monitoring the temperature of the heat medium 4 moving between the low temperature side heat storage tank 15 and the pump 33, and a second temperature sensor A bypass path 35 that connects the second forward path 31 and the second return path 32 upstream of 34 (the low temperature side heat storage tank 15 side), and a movement path of the heat medium 4 that moves through the second return path 32 are bypass paths. And a three-way control valve 36 for switching to 35. The second heat medium path is a system used in a general air conditioning system, and is not limited to a constant flow system using a three-way control valve. Naturally, a variable flow system that controls the pump 33 with an inverter or the like can also be used. It is.

  And in the said system, based on the measurement result of the 2nd temperature sensor 34, the three-way control valve 36 is controlled, and the temperature of the heat medium 4 which moves the 2nd outward path 31 is lower than preset temperature as needed. ), The heat medium 4 that moves through the second return path 32, that is, the heat medium 4 that has been heated and used for heat exchange by the load device 23 is introduced into the second forward path 31. . Thus, in the system, the temperature (set temperature) of the heat medium 4 introduced into the load device 23 is adjusted to 7 ° C. In addition, the code | symbol 37 in FIG. 1 is a pressure holding valve for hold | maintaining the pressure in the 2nd return path 32 to a positive pressure.

  As shown in FIG. 1, the system is submerged in the molten water 2 provided in the second return path 32 between the three-way control valve 36 and the high temperature side heat storage tank 16 and stored in the molten water tank 7. A second heat exchanger 38 is provided. The second heat exchanger 38 is stored in the molten water tank 7 by bringing the heat medium 4 heated for use in the heat exchange by the load device 23 and the molten water 2 stored in the molten water tank 7 into thermal contact with each other. The sensible heat of the molten water 2 is recovered. In addition, the code | symbol 39 in FIG. 1 is an on-off valve opened / closed as needed. Moreover, the pipe which comprises the 1st heat-medium path | route 22 and the 2nd heat-medium path | route 24 is using the stainless steel pipe by which the outer periphery was covered with the heat insulating material which consists of a foamable resin.

Next, the operation of the first embodiment will be described mainly with reference to FIG.
First, the circulation of the heat medium 4 in the first heat medium path 22 will be described. The heat medium 4 pumped up from the high temperature side heat storage tank 16 by the pump 27 moves through the first return path 26 and is returned to the first heat exchanger 5 by the header 12 (collecting pipe) on the return path side of the first heat exchanger 5. It is distributed to each heat transfer tube. Here, since the header 12 is submerged in the molten water 2 stored in the molten water tank 7, heat exchange is performed between the molten water 2 stored in the molten water tank 7 and the heat medium 4 that moves the header 12. And the sensible heat of the molten water 2 stored in the molten water tank 7 is recovered. In the first heat exchanger 5, the heat medium 4 is cooled by exchanging heat between the heat medium 4 moving through the heat transfer tubes and the molten water 2 stored in the snow storage tank 3.

  The heat medium 4 cooled by passing through the heat transfer tubes of the first heat exchanger 5 is collected by the header 11 (collection tube) on the forward path side. Again, since the header 11 is submerged in the molten water 2 stored in the snow storage tank 3, heat exchange is performed between the molten water 2 stored in the snow storage tank 3 and the heat medium 4 that moves the header 11. Is performed, the sensible heat of the molten water 2 stored in the snow storage tank 3 is recovered. The heat medium 4 collected by the header 11 moves through the first forward path 25 and is introduced into the low temperature side heat storage tank 15. Thus, by circulating the heat medium 4 through the first heat medium path 22, the cold heat of the heat medium 4 cooled by the first heat exchanger 5 is gradually stored in the low temperature side heat storage tank 15.

  In this system, the temperature of the heat medium 4 in the low temperature side heat storage tank 15 is raised and reaches 6 ° C., and the pump 27 is operated to circulate the heat medium 4 through the first heat medium path 22, thereby reducing the temperature of the heat medium 4. The temperature of the heat medium 4 stored in the heat storage tank 15 is lowered, and when the temperature of the heat medium 4 in the low temperature side heat storage tank 15 is lowered and reaches 4 ° C., the pump 27 is stopped to heat the heat medium in the first heat medium path 22. By stopping the circulation of 4, the temperature of the heat medium 4 stored in the low temperature side heat storage tank 15 is maintained at 3 to 4 ° C.

  Next, the distribution of the heat medium 4 in the second heat medium path 24 will be described. In the second heat medium path 24, the heat medium 4 pumped from the low temperature side heat storage tank 15 by the pump 33 moves through the second forward path 31 and is used for heat exchange by the load device 23. The heat medium 4 used for heat exchange by the load device 23 moves along the second return path 32 toward the high temperature side heat storage tank 16. In this system, based on the measurement result of the second temperature sensor 34, more specifically, when the measurement result of the second temperature sensor 34 is lower than the set temperature, the three-way control valve 36 is switched to load the load device. The temperature of the heat medium 4 introduced into the load device 23 is adjusted to 7 ° C. by introducing the heat medium 4 in the second return path 32, which has been heated by heat exchange at 23, into the second forward path 31. Has been.

  Further, the heat medium 4 moving through the second return path 32 is introduced into the second heat exchanger 38. In the second heat exchanger 38, heat is exchanged between the molten water 2 stored in the molten water tank 7 and the heat medium 4 to be cooled. Then, the heat medium 4 cooled and cooled by the second heat exchanger 38 is introduced into the high temperature side heat storage tank 16. Furthermore, in this system, the first watering device (first watering means) pumps the melted water 2 stored in the drainage tank 10 by the drainage pump 18 and sprays it on the roof portion 3b of the snow storage tank 3, thereby spraying water. The roof portion 3b is cooled by the latent heat and sensible heat when the molten water 2 is evaporated. Note that the melted water sprayed on the roof 3b of the snow storage tank 3 is collected by the gutter 21 and discharged out of the system.

The first embodiment has the following effects.
According to the first embodiment, the heat storage tank 13 is provided to constitute the snow air conditioning system, and the heat medium 4 is disposed in the first heat medium path 22 in the high temperature side heat storage tank 16, the first heat exchanger 5, and the low temperature side. It is circulated through the heat storage tank 15. Thereby, the cold energy of the heat medium 4 exchanged by the first heat exchanger 5 is stored in the low temperature side heat storage tank 15. Further, the heat medium 4 is circulated through the second heat medium path 24 via the low temperature side heat storage tank 15, the load device 23, and the high temperature side heat storage tank 16. As described above, in the first embodiment, for example, the heat medium 4 is circulated through the first heat medium path 22 in a 24-hour operation, so that the heat of the heat medium 4 exchanged in the first heat exchanger 5 is reduced in temperature. Heat can be gradually stored in the side heat storage tank 15. And by using the cold energy stored in the low temperature side heat storage tank 15 at the time of operation of the load device 23, the heat storage tank 13 includes the shortage of the heat exchange capacity of the first heat exchanger 5 with respect to the load fluctuation at the peak time. The first heat medium path 22 can be supplemented. Therefore, even if the heat transfer area of the first heat exchanger 5 is limited, and the first heat exchanger 5 cannot secure a heat exchange capacity corresponding to the peak load fluctuation, This system can prevent the heat exchange capacity from being insufficient.
In the first embodiment, since the heat storage capacity of the heat storage tank 13 is set to the minimum necessary by setting the heat exchange capacity of the first heat exchanger 5 to the maximum, the initial introduction cost of the heat storage tank 13 is minimized. Can be suppressed.
The molten water 2 overflowing the snow storage tank 3 has been conventionally drained to a drainage groove or the like, but according to the first embodiment, the molten water tank 7 storing the molten water 2 overflowing the snow storage tank 3 is provided, The molten water 2 was collected in the molten water tank 7, and the molten water 2 stored in the molten water tank 7 was brought into thermal contact with the heat medium 4 used for heat exchange in the load device 23 by the second heat exchanger 38. Therefore, the sensible heat of the molten water 2 can be used effectively, and the heat exchange efficiency of the system can be improved.
According to the first embodiment, the heat storage tank 13 is divided into a low temperature side heat storage tank 15 and a high temperature side heat storage tank 16, and heat is exchanged in the low temperature side heat storage tank 15 by the first heat exchanger 5. When the heat medium 4 is introduced, the cold heat of the heat medium 4 sent to the load device 23 is stored, and the heat medium 4 used for heat exchange in the load device 23 is introduced into the high temperature side heat storage tank 16. In addition, since the heat medium 4 sent to the first heat exchanger 5 is stored, the heat medium 4 used for heat exchange by the load device 23 and heated and the heat cooled by the first heat exchanger 5 and cooled. When there is no direct thermal contact with the medium 4 and the heat storage tank 13 does not have the partition wall 14, that is, the heat medium 4 with a relatively low temperature and the return heat medium 4 with a relatively high temperature are the heat storage tank 13. To improve the heat exchange efficiency of the system compared with the case of mixing in It can be. Further, the heat medium 4 pumped up from the high temperature side heat storage tank 16, that is, the heat medium 4 that has been heated for heat exchange by the load device 23, and the molten water 2 (including snow and ice 1) stored in the snow storage tank 3. Therefore, the temperature difference between the heat medium 4 and the molten water 2 is assumed to be the temperature difference when the heat medium 4 is brought into thermal contact with the molten water 2 on the assumption that the heat storage tank 13 does not have the partition wall 14. As a result, the heat exchange efficiency in the first heat exchanger 5 can be improved.
According to the first embodiment, the header 11 (collection tube) that consolidates the forward (exit) side of the plurality of rows of heat transfer tubes of the first heat exchanger 5 is submerged in the molten water 2 stored in the snow storage tank 3. Therefore, the sensible heat of the molten water 2 stored in the snow storage tank 3 can be efficiently recovered. In addition, since the header 12 (collection tube) for consolidating the return path (inlet) side of the plurality of rows of heat transfer tubes of the first heat exchanger 5 is submerged in the molten water 2 stored in the molten water tank 7, the molten water tank 7 It is possible to efficiently recover the sensible heat of the molten water 2 stored in the water. Thereby, the heat exchange efficiency of the said system can be improved.
According to the first embodiment, the molten water 2 overflowed from the molten water tank 7 is collected and stored in the drain tank 10 and stored in the drain tank 10 by the first watering device (first watering means). Since the molten water is sprinkled on the roof portion 3b of the snow storage tank 3, the molten water 2 sprinkled on the roof portion 3b evaporates in the snow storage tank 3, in particular, the roof portion 3b that tends to rise in temperature when exposed to sunlight. It can be cooled by latent heat and sensible heat. Moreover, since the water sprayed to the roof part 3b reuses the molten water 2 which overflowed from the molten water tank 7, when compared with the case where water is sprayed using water, an increase in running cost can be suppressed. it can.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to the accompanying drawings. In addition, the same name and code | symbol are provided to the structure which is the same as that of the structure in 1st Embodiment mentioned above, or it corresponds, and the detailed description is abbreviate | omitted.
The present snow air conditioning system has a snow density adjusting device (snow density adjusting means) that adjusts (increases) the density of snow ice stored in a snow storage tank. As shown in FIG. 3, the snow density adjusting device includes a second watering device (second watering means) for spraying snow and ice stored in the snow storage tank 3, and cold air (outside air) on the snow and ice stored in the snow storage tank 3. A blowing device (blowing means) for blowing air.

  The second watering device is supplied with rainwater from a rainwater water supply device (rainwater water supply means) in a third embodiment to be described later, and the rainwater is stored in the snow storage tank by a second water spray pipe 41 provided in the upper part of the snow storage tank 3. Water is sprinkled on snow and ice stored in 3. The blower device has a blower fan 42 that is installed on the outer wall of the snow storage tank 3 and can be operated using late-night power. The blower device has an outside air temperature for monitoring the outside air temperature. When the outside air temperature decreases and reaches −2 ° C., the blower device 42 starts to operate, and the outside air temperature rises to 0. The operation of the blower fan 42 is controlled so that the operation of the blower fan 42 is stopped when the temperature reaches ° C.

Next, the operation of the second embodiment will be described.
When removing snow with relatively low density that has been removed and left for a certain period of time, the snow density becomes about 0.5 Mg / m ³ due to its own weight. In the system, the second water sprinkling pipe 41 of the second water sprinkling device (second water sprinkling means) sprinkles water with relatively small density stored in the snow storage tank 3. Thereby, the uppermost part of snow becomes a sherbet shape, and the volume specific gravity of snow is increased. Further, the outside air below freezing point is blown to the top of the sherbet-like snow by the blower fan 42 of the blower (blower means). This refreezes the top of the snow. In this way, the snow density adjusting device (snow density adjusting means) repeats watering and refreezing to increase the density of snow ice stored in the snow storage tank 3 to about 0.7 to 0.8 Mg / m ^3. It is done.

  According to the second embodiment, in addition to the effects of the first embodiment described above, the density of snow and ice stored in the snow storage tank 3 can be maximized, and the volume of the snow storage tank 3 can be saved and more. Snow cooling can be operated for a long period of time.

(Third embodiment)
A third embodiment of the present invention will be described with reference to the accompanying drawings. In addition, the same name and code | symbol are provided to the structure which is the same as that of the structure in 1st Embodiment and 2nd Embodiment mentioned above, or it corresponds, and the detailed description is abbreviate | omitted.
This snow air-conditioning system stores rainwater collected at the time of rain in the snow storage tank 3, the melting water tank 7 and the drainage tank 10, and the stored rainwater is stored in the first watering device (first watering means) and the second watering device (first watering device). (2 watering means) has a rainwater water supply device (rainwater water supply means).

  As shown in FIG. 4, the rainwater supply apparatus has a rainwater channel 43 through which rainwater collected by the eaves 21 moves toward the snow storage tank 3. The rainwater channel 43 is provided with a rainwater drain valve 44. By operating the rainwater drain valve 44, the rainwater moving through the rainwater channel 43 is not sent to the snow storage tank 3 as necessary. It can be drained outside. Moreover, in the rainwater water supply apparatus, the water pipe 20 is branched, and one branched water pipe 20a is connected to the first water pipe 19 of the first water spray apparatus, and the other water pipe 20b is the second water spray apparatus. Are connected to the second water spray pipe 41. Each water pipe 20a and 20b is provided with a first watering switching valve 45 and a second watering switching valve 46, respectively. Further, reference numeral 40 in FIG. 4 is a rainwater switching valve provided in the rainwater channel 43.

  Moreover, the rainwater supply apparatus has a float sensor (not shown) that monitors the water level of the drainage tank 10, and the drainage pump 18 is controlled based on the detection result of the float sensor. In the system, the drainage pump 18 is controlled so that the water level is maintained at L1 in FIG. 4 during the operation of the snow cooling, and the water level is set to L2 (L2> L1) in FIG. 4 during the operation of the rainwater supply apparatus. The drain pump 18 is controlled to maintain. In FIG. 4, reference numeral 47 denotes a first drainage stopper provided in the snow storage tank 3, reference numeral 48 denotes a second drainage stopper provided in the melting water tank 7, and reference numeral 49 denotes a water level of the drainage tank 10 during operation of the rainwater supply apparatus. An overflow pipe for maintaining at L2, a reference numeral 50 is a rainwater trap, a reference numeral 51 is an upper water supply pipe for supplying water to the drain tank 10 in an emergency, and a reference numeral 52 is provided on the upper water supply pipe 52. It is a water switching valve.

Next, the operation of the third embodiment will be described.
When the operation of the snow cooling is finished, the water remaining in the system is first drained and cleaned. In this case, first, the first drain plug 47 and the second drain plug 48 are opened, and the drain pump 18 is operated. Thereby, the water stored in the snow storage tank 3, the melting water tank 7, and the drain tank 10 is drained out of the system. Next, the snow storage tank 3, the melting water tank 7, and the drainage tank 10 are cleaned. After completing the cleaning of the tanks 3, 7, and 10, the first drain cock 47 is closed, the rainwater switching valve 40 is opened, and the rainwater drain valve is closed. Thereby, the rainwater at the time of rain is collected by the fence 19 and introduced into the snow storage tank 3 through the rainwater channel 43.

  The rainwater stored in the snow storage tank 3 is stored in the molten water tank 7 via the overflow pipe 6 in excess of the set water level. Further, the rainwater stored in the molten water tank 7 is stored in the drain tank 10 through the overflow pipe 8 in excess of the set water level. Further, the rainwater stored in the drainage tank 10 becomes full, and the portion exceeding the set water level is drained to the rainwater trap 50 through the overflow pipe 49. When each of the tanks 3, 7, and 10 becomes full, the rainwater switching valve 40 is closed and the rainwater drain valve 44 is opened to drain the rainwater collected by the rod 19 out of the system. .

  The snow is stored in the snow storage tank 3, and after the storage of the snow is completed, the drain pump 18 is operated to drain the water remaining in the melting water tank 7. After completing the cleaning of the molten water tank 7, the second drain cock 48 is closed to prepare for the operation of the snow cooling.

  According to 3rd Embodiment, in addition to the effect which 1st Embodiment and 2nd Embodiment mentioned above show | play, by collecting and using rainwater, compared with the case where using clean water, running cost is reduced. Increase can be suppressed.

(Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to the accompanying drawings. In addition, the same name and code | symbol are provided to the structure which is the same as that of the structure in 1st Embodiment, 2nd Embodiment, and 3rd Embodiment mentioned above, or it corresponds, and the detailed description is abbreviate | omitted.
As shown in FIGS. 5 and 6, the present snow air conditioning system has a heat pump chiller 54 that controls the temperature of the heat medium 4 stored in the heat storage tank 13. The system extends from the heat pump chiller 54 to the first heat storage tank 15 and sends the heat medium 4 cooled or heated by the heat pump chiller 54 to the first heat storage tank 15 and the pump 56 by the second heat storage tank 16. The third return path 57 for sending the heat medium 4 pumped up from the heat pump chiller 54, the third temperature sensor 58 for monitoring the temperature of the heat medium 4 moving in the third forward path 55, and the measurement results of the first temperature sensor 28 And a control device 59 for controlling the operation of the heat pump chiller 54 and the pump 56. A third heat medium path 60 is configured by the third forward path 55 and the third return path 57.

Next, the operation of the fourth embodiment will be described.
First, a case where the system is used as a backup during cooling will be described. The control device 59 starts the operation of the heat pump chiller 54 and the pump 56 when the temperature of the heat medium 4 stored in the first heat storage tank 15 rises and reaches 6 ° C. Thereby, the heat medium 4 circulating through the third heat medium path 60 is cooled by the heat pump chiller 54, and the temperature of the heat medium 4 stored in the first heat storage tank 15 is lowered. Further, the control device 59 stops the operation of the heat pump chiller 54 and the pump 56 when the temperature of the heat medium 4 in the first heat storage tank 15 decreases and reaches 4 ° C. Thus, the temperature of the heat medium 4 stored in the first heat storage tank 15 is maintained at 3 to 6 ° C. by controlling the operation of the heat pump chiller 54 and the pump 56 by the control device 59.

  Next, the case where the said system is utilized as heating is demonstrated. The control device 59 starts the operation of the heat pump chiller 54 and the pump 56 when the temperature of the heat medium 4 stored in the first heat storage tank 15 decreases and reaches 60 ° C. Thereby, the heat medium 4 circulating through the third heat medium path 60 is heated by the heat pump chiller 54, and the temperature of the heat medium 4 stored in the first heat storage tank 15 is increased. The control device 59 stops the operation of the heat pump chiller 54 and the pump 56 when the temperature of the heat medium 4 in the first heat storage tank 15 rises and reaches 70 ° C. In this way, by controlling the operation of the heat pump chiller 54 and the pump 56 by the control device 59, the temperature of the heat medium 4 stored in the first heat storage tank 15 is maintained at about 70 ° C.

  According to the fourth embodiment, in addition to the effect of the first embodiment described above, the heat medium 4 of the heat storage tank 13 is circulated via the heat pump chiller 54, so that the load fluctuation at the peak is The heat pump chiller 54 can be used as a backup for snow cooling when the heat exchange capacity of the system is exceeded or when the snow and ice 1 in the snow storage tank 3 is used up. Furthermore, the system can be used as heating by heating the heat medium 4 circulating through the third heat medium path 60 by the heat pump chiller 54. Further, by employing the heat pump chiller 54, it is possible to obtain hot water using late-night power with a low charge, and therefore it is possible to reduce running costs compared to the case where a hot water boiler or the like is used.

(Fifth embodiment)
A fifth embodiment of the present invention will be described with reference to the accompanying drawings. In addition, the same name and code | symbol are provided to the structure which is the same as that of the structure in 1st Embodiment, 2nd Embodiment, and 3rd Embodiment mentioned above, or it corresponds, and the detailed description is abbreviate | omitted.
As shown in FIGS. 7 and 8, the present snow air conditioning system includes a third heat exchanger 61 and a fourth heat medium in which the heat medium 4 circulates via the third heat exchanger 61 and the heat storage tank 13. A path 62 and a fifth heat medium path 63 through which the heat medium 4 circulates via the third heat exchanger 61 and the load device 23 are included. The configurations of the third heat exchanger 61, the fourth heat medium path 62, and the fifth heat medium path 63 in the system according to the fifth embodiment are the same as those of the second heat medium of the system according to the first embodiment described above. This corresponds to the configuration of the path 24.

  The fourth heat medium path 62 includes a fourth forward path 64 in which the heat medium 4 used for heat exchange in the third heat exchanger 61 moves toward the high temperature side heat storage tank 16, and a pump 65 from the low temperature side heat storage tank 15. And a fourth return path 66 that sends the pumped heat medium 4 to the third heat exchanger 61. The fifth heat medium path 63 includes a fifth forward path 67 for sending the heat medium 4 cooled by the third heat exchanger 61 to the load device 23, and a heat medium 4 used for heat exchange by the load device 23. And a fifth return path 68 to be sent to the three heat exchangers 61. The pump 65 is configured to be controlled based on the measurement result of the second temperature sensor 34.

  According to the fifth embodiment, in addition to the effects of the first embodiment described above, the third heat exchanger 61 circulates the heat medium 4 that circulates through the fourth heat medium path 62 and the fifth heat medium path 63. Since the heat medium 4 is brought into thermal contact, the fifth heat medium path 63 passing through the load device 23 can be a closed circuit. Thereby, corrosion of the pipes constituting the fifth heat medium path 63 including the load device 23 can be prevented. Further, since the pump 33 only needs to circulate the heat medium 4 to the closed fifth heat medium path 63, the heat storage tank 13, the load device 23, Compared with the case where it circulates between, the burden of the said pump 33 can be reduced. Furthermore, since the heat medium 4 circulating through the fifth heat medium path 63 can be simply water (tap water), the amount of antifreeze used as the heat medium 4 can be greatly reduced, and the equipment cost and Running costs can be reduced.

DESCRIPTION OF SYMBOLS 1 Snow ice (snow), 2 Melted water, 3 Snow storage tank, 3a Bottom part, 3b Roof part (roof), 4 Heating medium, 5 1st heat exchanger, 7 Melted water tank, 10 Drain tank, 11 Header (collection pipe), 12 11 header (collecting pipe), 13 heat storage tank, 15 low temperature side heat storage tank, 15 high temperature side heat storage tank, 19 first water spray pipe (first water spray means), 22 first heat medium path, 23 load device, 24 second Heat transfer path

Claims (9)

A snow air-conditioning system that cools the air-conditioned equipment using the cold heat of the melted snow stored in a snow storage tank,
A first heat exchanger that makes thermal contact between the heat medium used for heat exchange in the load device and the molten water stored in the snow storage tank;
A heat storage tank in which the heat medium heat-exchanged by the first heat exchanger is stored and the heat is stored;
A first heat medium path through which the heat medium circulates via the heat storage tank and the first heat exchanger;
A second heat medium path through which the heat medium stored in the heat storage tank directly or in contact with the heat medium circulates via the load device;
A snow air conditioning system characterized by comprising: A molten water tank in which the molten water overflowing the snow storage tank is stored;
A second heat exchanger for bringing the molten water stored in the molten water tank into thermal contact with the heat medium used for heat exchange in the load device;
The snow air conditioning system according to claim 1, further comprising: The heat storage tank
A low-temperature-side heat storage tank in which the heat medium exchanged by the first heat exchanger is introduced and the heat medium sent to the load device is stored;
A high-temperature side heat storage tank in which the heat medium used for heat exchange in the load device is introduced and the heat medium sent to the first heat exchanger is stored;
A communication path for communicating the low temperature side heat storage tank and the high temperature side heat storage tank;
The snow air conditioning system according to claim 1, wherein the snow air conditioning system is provided. The first heat exchanger has a plurality of heat transfer tubes laid on the floor of the snow storage tank,
A collecting tube that consolidates the forward side of the plurality of rows of heat transfer tubes is provided to be submerged in the molten water stored in the snow storage tank,
The snow air-conditioning system according to any one of claims 1 to 3, wherein a collecting pipe for collecting the return sides of the plurality of rows of heat transfer pipes is provided so as to be submerged in the molten water stored in the molten water tank. . Having first watering means for watering the roof of the snow storage tank;
5. The snow air conditioning system according to claim 1, wherein the first watering means sprays water using the molten water that has overflowed from the molten water tank. Snow density adjusting means for adjusting the snow density of the snow stored in the snow storage tank;
The snow density adjusting means includes: second water sprinkling means for sprinkling the snow stored in the snow storage tank; and air blowing means for blowing cold air to the snow sprinkled by the second water sprinkling means to refreeze the snow. The snow air conditioning system according to any one of 1 to 5, which is characterized. The snow air conditioning system according to claim 5 or 6, further comprising rainwater water supply means for storing rainwater and supplying the stored rainwater to the first water spray means or the second water spray means. The snow air conditioning system according to any one of claims 1 to 7, further comprising: a heat pump chiller; and a third heat medium path through which the heat medium circulates through the heat pump chiller and the heat storage tank. . The second heat medium path includes a third heat exchanger, a fourth heat medium path through which the heat medium circulates through the third heat exchanger and the heat storage tank, and the heat medium is the third heat exchanger. The snow air conditioning system according to any one of claims 1 to 8, further comprising a fifth heat medium path that circulates through a heat exchanger and the load device.

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