JP2005308314A - Air conditioning system using ocean deep water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning system having reduced running cost, with a longer-life heat exchanger for heat exchange between water to be supplied to an air-conditioner and ocean deep water. <P>SOLUTION: The air conditioning system using the ocean deep water performs cooling operation while supplying water cooled by heat exchange with the ocean deep water to a cooling coil 5 provided in an air passage of the air-conditioner 2. During normal operation, the air conditioning system adjusts the amount of the ocean deep water to be supplied to the heat exchanger 6 for heat exchange between the ocean deep water and the water depending on air conditioning load, but during stopping the cooling operation, the air conditioning system supplies a preset maximum amount of ocean deep water to the heat exchanger. Thereby, dirt in the heat exchanger flows out and corrosion in the heat exchanger is prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air conditioner using deep ocean water as a cold heat source.

  Since deep ocean water is at a substantially constant low temperature regardless of changes in surface seawater temperature, various technologies using the cold energy of this deep ocean water have been proposed (see Patent Document 1).

  When using deep ocean water cooling for air conditioning (cooling), supply ocean deep ocean water directly to the air-water heat exchanger of the air conditioner installed in the machine room, and air cooled by the heat exchanger is ducted All-air system for supplying air to air-conditioned rooms through air, and air conditioners that supply deep ocean water to a water-water heat exchanger to cool fresh water and provide cooled fresh water (cold water) in each air-conditioned room There is a water system in which the air in each air-conditioned room is cooled by supplying to the air-water heat exchanger.

In the water system described above, the amount of deep ocean water supplied to the water-water heat exchanger is adjusted according to the cooling air-conditioning load of the air-conditioned room. -The amount of deep ocean water flowing in the water heat exchanger is small, so contaminants in the ocean deep water become dirty and adhere to the heat exchanger, and rust is generated in the heat exchanger, Dirt and rust cause problems such as reduced heat exchange efficiency, increased load on pumps that send deep ocean water, short heat exchanger life, frequent maintenance, and increased running costs .
JP 2000-87579 (pages 1-7 and FIG. 1)

  An object of the present invention is to provide an air conditioner capable of extending the life of a heat exchanger for exchanging heat between water supplied to the air conditioner and deep ocean water and reducing running costs. Is to provide.

  In order to achieve the above object, an air conditioner according to claim 1 of the present invention supplies cooling water by heat exchange with deep sea water to a cooling coil provided in an air passage of an air conditioner to perform cooling operation. In an air conditioner using deep ocean water to be performed, during the normal operation of the air conditioner, the supply amount of deep ocean water supplied to a heat exchanger that performs heat exchange between the deep ocean water and water is adjusted according to the air conditioning load. In addition, when the cooling operation of the air conditioner is stopped, a maximum amount of deep ocean water is supplied to the heat exchanger in advance so that dirt in the heat exchanger flows out and corrosion in the heat exchanger is prevented. As a thing.

  In the air conditioner according to claim 2 of the present invention, the heat exchanger is supplied with a maximum amount of deep ocean water set in advance at least during a time when the cooling air-conditioning load is small, It is configured so that dirt is poured out and corrosion in the heat exchanger is prevented.

  The air conditioner according to claim 3 of the present invention detects the differential pressure of deep ocean water between the deep ocean water inlet side and the same outlet side of the heat exchanger, and when this differential pressure exceeds a preset value, the deep ocean water A maximum amount of water set in advance is supplied to the heat exchanger so that dirt in the heat exchanger flows out and corrosion in the heat exchanger is prevented.

  According to the present invention, in the heat exchanger for exchanging heat between the water sent to the air conditioner and the deep ocean water, contaminants in the deep ocean water adhere as dirt, or rust is generated and plate heat exchange occurs. The flow of the deep ocean water in the vessel is prevented from being disturbed, and the corrosion in the heat exchanger is also prevented. Since it does not need to be performed frequently, the life of the heat exchanger can be extended, and the running cost can be reduced.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an air conditioner according to the present invention will be described in detail based on specific examples shown in the accompanying drawings.
In the air passage of the air conditioner 2 provided in the air-conditioned room 1, an air filter 3, a blower 4, and a cooling coil 5 serving as an air-water heat exchanger are provided from the air inlet 2a side toward the outlet 2b side. A water feed pipe 7 from a plate heat exchanger 6 which is a water-water heat exchanger is connected to the cold water inlet 5a of the cooling coil 5, and a water return to the plate heat exchanger is connected to the cold water outlet 5a. A tube 8 is connected.

  The plate heat exchanger 6 performs heat exchange between deep sea water and water, and a deep water feed pipe 9 and a return pipe 10 are connected to the primary side of the plate heat exchanger, The water feed pipe 7 and the water return pipe 8 are connected to the secondary side.

  In the middle of the water feed pipe 7 and the water return pipe 8, a bypass pipe 11 that connects the water feed pipe and the water return pipe is connected, and the water feed pipe or the water return pipe of the bypass pipe is connected. The first control valve mechanism 12 is provided at a branch portion (a branch portion on the water return pipe 8 side in FIG. 1).

  Further, a bypass pipe 14 that connects the feed pipe and the return pipe is also connected in the middle of the deep sea water feed pipe 9 and the return pipe 10, and the deep sea water feed pipe 9 in the bypass pipe is connected thereto. Alternatively, the second control valve mechanism 15 is provided at a branch portion with the return pipe 10 (a branch portion on the return pipe 10 side in FIG. 1).

  Each of the control valve mechanisms 12 and 15 is composed of, for example, a three-way flow control valve, and is between the first inlet ports 12a and 15a and the outlet ports 12c and 15c, and the second inlet ports 12b and 15b and the outlet. The flow rate between the ports 12c and 15c can be controlled. Therefore, the amount of water sent to the cooling coil 5 and the amount of deep ocean water sent to the plate heat exchanger 6 can be arbitrarily controlled.

  Further, the blower 4 can adjust the amount of air blown by the inverter 13, and can arbitrarily control the amount of air sucked from the air inlet 2a of the air conditioner 2 and sent from the air outlet 2b through the cooling coil. Yes.

  The control valve mechanisms 12 and 15 and the inverter 13 are connected to the control circuit 16 by signal lines, respectively. In the first control valve mechanism 12, the control coil mechanism 12 is connected to the cooling coil 5 based on a signal from the control circuit. In the second control valve mechanism 15, the water supply amount can be adjusted, and in the inverter 13, the deep-sea water supply amount to the plate heat exchanger 6 can be adjusted.

  Further, a temperature sensor 17 and a humidity sensor 18 provided in the air-conditioned room 1 are connected to the control circuit 16, and based on the temperature and humidity in the air-conditioned room detected by the temperature sensor and the humidity sensor. The control valve mechanisms 12 and 15 and the inverter 13 are controlled.

  Specifically, when the humidity in the air-conditioned room 1 is a predetermined humidity that is set in advance, for example, 60% RH or less, the control circuit sets a predetermined amount of air blown from the blower to the inverter 13. The control valve mechanism 12 is controlled so as to keep the value constant, and the cold water supply amount to the cooling coil 5 and the deep ocean water to the plate heat exchanger 6 are controlled based on the temperature detected by the temperature sensor. The temperature control operation is performed to adjust the supply amount.

  More specifically, when the temperature in the air-conditioned room 1 is somewhat higher than the set temperature, the amount of cold water supplied from the water feed pipe 7 to the cooling coil 5 side in the first control valve mechanism 12 is increased, and the bypass pipe 11 When the amount of chilled water fed to the side is reduced and the temperature in the air-conditioned room is somewhat lower than the set temperature, the amount of chilled water supplied from the water feed pipe 7 to the cooling coil side in the first control valve mechanism 12 is decreased. Increase the amount of cold water fed to the bypass pipe 11 side.

  When the air conditioning load is further large, the amount of deep ocean water supplied from the deep ocean water feed pipe 9 to the plate heat exchanger 6 in the second control valve mechanism 15 is increased, and the bypass pipe 14 side is increased. When the amount of deep sea water to be fed is reduced, and the air conditioning load is small, the deep sea water from the deep sea water feed pipe 9 to the plate heat exchanger in the second control valve mechanism 15 is reduced. The feed amount of the deep ocean water to the bypass pipe 14 side is increased.

  In addition, when the humidity in the air-conditioned room is a predetermined humidity set in advance, for example, less than 60% RH, the control circuit controls the inverter 13 so as to keep the air flow rate of the blower at a preset minimum value. And a dehumidifying operation is performed for the control valve mechanism 12 so as to supply the entire amount of cold water to the cooling coil side.

  In this dehumidifying operation, the amount of air blown is the minimum value and the amount of cold water supplied to the cooling coil is the maximum, so the air in the air passage is cooled to a temperature lower than the dew point, dehumidified, and supplied to the air-conditioned room. The drain condensed on the surface of the cooling coil 5 is discharged outside the air conditioner through a drain pan and a drain pipe (not shown).

  By the way, the control circuit 16 is provided with a timer 16a, which is turned on when the above-described dehumidifying operation is started, and is turned off when a preset time has elapsed, and the dehumidifying operation is stopped by turning this timer off. Thus, the temperature control operation described above is performed from the dehumidification operation.

  More specifically, when the air conditioning sensible heat load of the air in the air-conditioned room is large and the dehumidification operation does not end within a predetermined time, the temperature control in the air-conditioned room can be resumed to give priority to the temperature control. It is like that.

  Thus, when the cooling operation is stopped, the maximum amount of deep ocean water to be sent to the plate heat exchanger 6 is supplied in advance, so that dirt in the heat exchanger is washed out and corrosion in the heat exchanger is prevented. It is supposed to be.

  Further, in the time zone such as nighttime when the cooling air-conditioning load is small, the maximum amount of deep sea water to be sent to the plate heat exchanger 6 is supplied in the same manner as when the cooling operation is stopped, and the heat exchanger is supplied. The internal dirt is washed out and corrosion in the heat exchanger is prevented.

  Further, pressure gauges 29 and 30 are respectively provided in the deep sea water feed pipe and the return pipe at the deep sea water inlet and outlet in the plate heat exchanger 6, and the deep sea water detected by these pressure gauges. The water supply pressure value is sent to the control circuit 16, and when the pressure difference exceeds a preset value, dirt adheres to the flow path of the deep sea water in the plate heat exchanger 6. The control circuit sends the maximum amount of deep sea water set in advance to the second control valve mechanism 15, for example, the entire amount from the feed pipe 9 to the plate heat exchanger, and the dirt in the heat exchanger is washed away. It is configured to issue.

  In addition, when the pressure difference does not change while exceeding the set value, or when the pressure difference further increases and reaches a preset upper limit value, an alarm is output by voice or a lamp. When this alarm output is issued, maintenance work or inspection work such as cleaning of the plate heat exchanger by a supervisor or service person is performed.

  The pressure gauge is not provided at the inlet and the outlet of the plate heat exchanger 6, but may be a differential pressure gauge in which a pressure guiding tube is connected to the inlet and the outlet.

  In the above-described embodiment, cold water is supplied to one air conditioner provided in one air-conditioned room, but in reality, one cold water circulation line is provided for each air conditioner provided in a plurality of air-conditioned rooms. The air conditioners are connected in parallel to supply cold water, and the temperature and humidity of each air-conditioned room are individually controlled. In this case, the temperature sensor 17 and the humidity sensor 18 are provided in each air-conditioned room and controlled. The circuit 16 may also be provided for each air-conditioned unit, or individual control for each air-conditioned room may be centrally controlled by one control circuit.

  In the above-described embodiment, the deep ocean water is exchanged with water and supplied to the cooling coil of the air conditioner. However, as shown in FIG. 2, the cold ocean and the deep ocean water are both used. In some cases.

  Specifically, an air filter 20, a first cooling coil 21, a second cooling coil 22, and a blower 23 are provided in this order from the upstream side in the air flow direction in the air passage of the air conditioner 19. Supplies cold water in the same manner as in the embodiment shown in FIG. 1 and directly supplies deep ocean water to the second cooling coil 22.

  Thus, the cold water supply to the first cooling coil 21 and the air volume control for the blower 23 are performed in the same manner as in the first embodiment, but the deep sea water feed pipe 24 and the return pipe 25 to the second cooling coil 22 are used. In the same manner as in the case of the water feed pipe 7 and the return pipe 8 in the first cooling coil, a bypass pipe 26 and a third control valve mechanism 27 are provided, and the third control valve mechanism 27 is also provided in the first cooling coil. Control is performed in the same manner as in the embodiment.

  The thing of 2nd Example mentioned above is suitable for the all-air system which supplies cooling air to each air-conditioned room by the duct 28. FIG.

The block diagram which shows the Example of the apparatus which concerns on this invention. The block diagram which shows the other Example of the apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air-conditioned room 2 Air conditioner 3 Air filter 4 Blower 5 Cooling coil 6 Plate heat exchanger 7 Water feed pipe 8 Water return pipe 9 Deep sea water feed pipe 10 Deep sea water return pipe 11 Bypass pipe 12 1st control Valve mechanism 13 Inverter 14 Bypass pipe 15 Second control valve mechanism 16 Control circuit 17 Temperature sensor 18 Humidity sensor 19 Air conditioner 20 Air filter 21 First cooling coil 22 Second cooling coil 23 Blower 24 Deep sea water feed pipe 25 Ocean Deep water return pipe 26 Bypass pipe 27 Third control valve mechanism 28 Duct 29, 30 Pressure gauge

Claims (3)

  In an air conditioner using deep ocean water that performs cooling operation by supplying water cooled by heat exchange with deep ocean water to a cooling coil provided in the air passage of the air conditioner, the air conditioning load during air conditioning is normal. Accordingly, the supply amount of the deep sea water to be supplied to the heat exchanger that performs heat exchange between the deep sea water and the water is adjusted, but when the cooling operation of the air conditioner is stopped, the deep water is preset in the heat exchanger. An air conditioner using deep ocean water that is configured to supply the maximum amount so that dirt in the heat exchanger flows out and prevents corrosion in the heat exchanger.   The heat exchanger is supplied with a preset maximum amount of deep ocean water at least during the day when the cooling air-conditioning load is small, so that dirt in the heat exchanger flows out and corrosion in the heat exchanger occurs. The air conditioner using deep ocean water according to claim 1, wherein the air conditioner is configured to prevent water from being prevented.   Detecting the differential pressure of deep ocean water at the deep ocean water inlet side and the outlet side of the heat exchanger, and supplying this maximum amount of deep ocean water to the heat exchanger when this differential pressure exceeds a preset value Then, the air conditioner using deep ocean water according to claim 1, wherein dirt in the heat exchanger is poured out and corrosion in the heat exchanger is prevented.

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