WO2017195885A1

WO2017195885A1 - Floor air conditioning system

Info

Publication number: WO2017195885A1
Application number: PCT/JP2017/018004
Authority: WO
Inventors: 矢野　昭彦
Original assignee: 株式会社ライフル
Priority date: 2016-05-12
Filing date: 2017-05-12
Publication date: 2017-11-16
Also published as: TWI646291B; JPWO2017195885A1; TW201901100A; JP6249387B1

Abstract

Provided is a floor air conditioning system that has a simple structure and low energy costs. A floor air conditioning system 1 comprises: a solar heat collecting device 2; a first tank 3 that stores water heated by the solar heat collecting device 2; a heat pump device 5; a second tank 4 that stores water heated by the heat pump device 5; a connecting pipe p1 that connects the top of the first tank 3 to the bottom of the second tank; a first pipe 6 that is disposed in an underfloor 9; a first directional control valve 71 that is connected to a water supply pipe 100, a second pipe 8, and the first tank 3; a second directional control valve 72 that is connected to the second tank 4, the first pipe 6, and the second pipe 8; and a third directional control valve 73 that is connected to the first pipe 6 and piping p3, 4. By switching the first directional control valve 71, the second directional control valve 72, and the third directional control valve 73, water stored in the first tank 3 is supplied to the first tank 3 or the second tank 4 via the first pipe 6 or water supplied from the water supply pipe 100 is supplied to the first tank 3 or the second tank 4 via the first pipe 6.

Description

Floor air conditioning system

The present invention relates to a floor air conditioning system for buildings.

A variety of devices have been considered for floor air conditioning systems using natural energy such as solar heat.

According to the invention of Patent Document 1, in order to provide a floor heating system in which the thermal energy of sunlight can be stored and taken out when necessary and the installation space is not a problem, a solid foundation is provided under the floor board 1. Layer 2 and heat insulation layer 92 are arranged in this order, solar hot water collector panel 12 is installed outdoors as a heat source, and hot water is applied to the inside of solar hot water collector panel 12 and the inside of base layer 2 by pumps 20, 23, 33. In the floor heating system in which the solid base layer 2 functions as a heat dissipation layer by providing the circulating heat transfer path 13, the heat storage layer 5 is provided under the heat insulating layer 92, and the heat transfer path 13 is the solar hot water collecting panel 12. The heat storage path 16 through which hot water circulates inside the heat storage layer 5 and the inside of the heat storage layer 5 and the heat dissipation path 17 through which the hot water circulates inside the solid storage layer 16 and the inside of the solid base layer 2 are proposed. To have.

According to the invention of Patent Document 2, there is a structure with low energy cost for controlling the room temperature of a house by suppressing waste of artificial energy such as oil, gas, electricity, etc., and effectively using solar heat and underground geothermal heat. The challenge is to provide a simple air-conditioning system. The fresh outside air taken in by the total heat exchange type ventilation fan installed in the building is sent to the lower part of the first floor of the building, and the base floor under the first floor is U. Multiple underground heat recovery pipes shaped into a letter shape are embedded, and a blower is attached to one end of the underground heat recovery pipe. The air sucked into the underground heat recovery pipe is recovered by underground heat in the winter. It is warmed in the pipe, and in the summer, it is cooled in the underground heat recovery pipe by underground heat, and the temperature of the air at the bottom of the first floor is adjusted, and the temperature adjusted air is supplied to the air supply duct. Supply to the ceiling inside each floor via the ceiling Configuration the invention is proposed to supply to the room from the louver provided.

JP 2009-216264 A JP 2012-172966 A

However, in Patent Document 1, the cost of facilities increases due to the complexity of the building structure, and in Patent Document 2 above, emphasis is placed on the use of underground heat, and the efficiency of solar energy in addition to air conditioning of the floor Use is still not enough. An object of the present invention is to provide a floor air-conditioning system having a low energy cost and a simple structure.

In order to solve the above problems, the invention according to claim 1 is a floor air conditioning system, a solar heat collector, a first tank that stores water heated by the solar heat collector, a heat pump device, A second tank for storing water heated by the heat pump device, a connecting pipe connecting the upper part of the first tank and the bottom part of the second tank, and a lower part of the floor, and one end part of which is connected to the first tank. A first pipe to be connected; a first direction control valve connected to one end of the water source pipe and the second pipe; and the first tank; a second tank; the other end of the first pipe; and the second pipe. The second directional control valve connected to the other end of the first directional control valve is switched between the first directional control valve and the second directional control valve, whereby the water stored in the first tank is supplied to the second tank and the first directional control valve. Switch to a route that goes through a pipe to supply to the first tank, or a water supply pipe The water supplied, and supplying the first tank by switching the path through the second pipe and the first pipe.

Explanation of floor air conditioning in summer. In summer, by switching the first direction control valve and the second direction control valve, the water supplied from the water source pipe is switched to a path that passes through the second pipe and the first pipe to reach the first tank. Is formed. Thereby, when hot water stored in the second tank is supplied, tap water having a low temperature is supplied to the first pipe. The tap water having a low temperature is heat-exchanged with the heat stored in the internal space under the floor, and the temperature of the internal space under the floor is lowered, while the temperature of the tap water is raised. This elevated temperature tap water is supplied to the first tank. As a result, the hot water staying in the upper part of the first tank is supplied to the second tank via the connection pipe. In this way, the lower floor can be air-conditioned with tap water supplied from the water source pipe, and hot water having a relatively high temperature is supplied to the second tank, so that floor air conditioning can be efficiently performed in summer. Energy costs can be reduced.

Describe floor air conditioning in winter. The first tank is filled with the water filled therein, and the hot water heated by the solar heat collecting device is in a state of staying upward. Moreover, the 2nd tank is satisfy | filled with the hot water which was heated with the heat pump apparatus and became substantially constant temperature. In winter, by switching between the first directional control valve and the second directional control valve, the water stored in the first tank forms a path to the first tank via the second tank and the first pipe. Is done. That is, a path for circulating water is formed. When the floor air conditioning system is operated, the hot water stored in the second tank is supplied to the first pipe. The hot water exchanges heat with the air in the internal space below the floor, and the temperature of the internal space below the floor rises, while the temperature of the hot water decreases. The warm water whose temperature has been reduced returns to the first tank. As for the water in the first tank heated by the solar heat collecting device, warm water stays in the upper part and water having a relatively high specific gravity stays in the lower part. When the hot water whose temperature has decreased returns to the first tank, the hot water remaining in the upper part of the first tank is supplied to the second tank via the connection pipe. In this way, since the operation of the heat pump device is reduced by supplying hot water having a relatively high temperature to the second tank, the energy cost in winter can be reduced.

Moreover, according to this structure, a floor air conditioning system stores the solar heat collector, the 1st tank which stores the water heated with the solar heat collector, the heat pump apparatus, and the water heated with the heat pump apparatus. A second tank, a connecting pipe that connects the upper part of the first tank and the bottom of the second tank, a first pipe that is disposed under the floor and has one end connected to the first tank, and a water source pipe A first direction control valve connected to one end of the second pipe and the first tank, a second direction connected to the second tank, the other end of the first pipe, and the other end of the second pipe. A control valve is provided, and by switching between the first directional control valve and the second directional control valve, the water stored in the first tank is switched to a path passing through the second tank and the first pipe. Or the water supplied from the water source pipe to the second pipe and the second pipe. Because it is providing to the first tank by switching the path through the tube, it is possible to structure provides a simple floor air-conditioning system.

The invention according to claim 2 is the floor air conditioning system according to claim 1, further comprising a third direction control valve connected to one end of the first pipe, the first tank, and the second tank, in the third direction. By switching the control valve, water passing through one end of the first pipe is supplied to the first tank or supplied to the second tank.

According to this configuration, the apparatus further includes the third direction control valve connected to the one end of the first pipe and the first tank and the second tank, and by switching the third direction control valve, Since the water passing through the end portion can be supplied to either the first tank or the second tank, the temperature of the water staying at the upper portion of the first tank causes one end portion of the first pipe to When the temperature is lower than the temperature of the passing water, water can be supplied to the second tank, and when it is higher, the water can be supplied to the first tank. Thereby, water with relatively high temperature can be supplied to the second tank. As a result, since the operation of the heat pump device is further reduced, the energy cost can be further reduced.

The invention according to claim 3 is the floor air conditioning system according to

claim

1 or 2, further comprising a first control unit connected to the first directional control valve and the second directional control valve, The flow of water passing through the first tank, the second tank, the first pipe, and the second pipe is controlled.

According to this configuration, by including the first control unit connected to the first directional control valve and the second directional control valve, the first tank, the second tank, the first pipe, and the second pipe are passed. Since the flow of water is controlled, the path used for the floor air conditioning system in winter and summer can be easily configured.

According to a fourth aspect of the present invention, in the floor air-conditioning system of the second aspect, the temperature sensor provided at one end of the first tank, the second tank, and the first pipe, and the third direction control valve A second control unit connected to the second control unit, wherein the second control unit is configured to supply water passing through the first pipe to the first tank based on a detection value of the temperature sensor or to supply the second tank; It is characterized by doing.

According to this configuration, the second control unit includes the temperature sensor provided at one end of the first tank, the second tank, and the first pipe, and the second control unit connected to the third direction control valve. The unit controls the flow of supplying water passing through the first pipe to the first tank or the flow of supplying the second tank based on the detection value of the temperature sensor, so that the energy cost can be reduced. The air conditioning system can operate automatically.

The invention according to claim 5 is the floor air-conditioning system according to any one of claims 1 to 4, wherein no air vent with outside air is installed in the lower part of the floor, and air inside the lower part of the floor is shut off from the outside. Alternatively, the air vent is structured to be openable and closable, and the air vent is opened and closed to make a sealed state.

According to this configuration, the outside air is not installed under the floor by blocking the air inside the bottom of the floor from the outside air, or by closing the air vent so that the air vent can be opened and closed. It will be in the sealing state which does not flow directly into a part, and floor air-conditioning by solar energy becomes efficient.

The invention according to claim 6 is characterized in that, in the floor air conditioning system according to any one of claims 1 to 5, a heat shield sheet is laid under the first pipe.

According to this configuration, since the heat shielding sheet is laid under the first pipe, heat escape from the first pipe can be prevented, and the floor air conditioning can be made more efficient.

It is a block diagram of the floor air-conditioning system of this embodiment. It is an operation | movement figure of the summer of the floor air conditioning system of this embodiment. It is an operation | movement figure of the winter season of the floor air-conditioning system of this embodiment. It is an operation | movement figure when supplying hot water to a bath in winter. It is a figure showing the heating state of the water stored in the 1st, 2nd tank.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the floor air-conditioning system 1 includes a water source pipe 100 that supplies tap water, a solar heat collector 2, a first tank 3 that stores hot water heated by the solar heat collector 2, and a heat pump. The apparatus 5, the second tank 4 that stores the hot water heated by the heat pump apparatus 5, the connection pipe p <b> 1 that supplies the hot water stored in the first tank 3 to the second tank 4, and the first provided in the lower floor 9. A first pipe 6, a first tank 3, a second tank 4, a heat pump device 5, and pipes p 2, p 3, p 4, p 5, p 6 connected between the first pipe 6 and a first pipe for switching the flow in the pipe. A directional control valve 71, a second directional control valve 72, a third directional control valve 73, a first control unit 81 that controls these three valves, a second control unit 82, and

temperature sensors

32 and 62 are configured. Has been. Thereby, it becomes possible to adjust the temperature inside the floor lower part 9 with warm water or water.

The first tank 3 is full of water supplied from the water source pipe 100. The second tank 4 is water supplied from a connection pipe p <b> 1 that connects the upper part of the first tank 3 and the bottom part of the second tank 4, and is in a full state like the first tank 3.

The solar heat collector 2 is a closed circuit in which a solar heat collector 21, a heat exchanger 22, and a heat collection pump 24 are connected in series by

pipes

26, 27, and 28. The heat exchanger 22 is provided inside the first tank 3. When the heat collection pump 24 is operated, the heat medium circulates between the solar heat collector 21 and the heat exchanger 22. The heat medium flowing into the solar heat collector 21 is heated by solar heat while passing through the solar heat collector 21, and is sent to the heat exchanger 22. The heat medium that has flowed into the heat exchanger 22 is heat-exchanged to lower the temperature, while the water stored in the first tank 3 in a full state is heated. The heat medium whose temperature has been lowered is sent again to the solar heat collector 21 and heated.

The heated water rises and stays in the upper part because its specific gravity is smaller than the surrounding water. As a result, the water stored in the first tank 3 is heated, and the water whose temperature has risen stays in the upper part (see FIG. 5).

Although not shown, the heat pump device 5 is an inverter motor driven compressor that compresses the refrigerant, a refrigerant-water heat exchanger that heats water by exchanging heat with the compressed high-temperature refrigerant, and a refrigerant-water heat exchanger. It comprises an evaporator that evaporates the refrigerant condensed by the heat of ambient air, a motor-driven blower fan provided in the evaporator, an expansion valve, and the like. The heat pump device 5, the circulation pump 56, and the second tank 4 constitute a closed circuit connected in series by

heat pump pipes

52, 53, and 54. When the circulation pump 56 is operated, the water stored in the second tank 4 is heated by the heat pump device 5 via the

heat pump pipes

54 and 53, and the heated water is supplied to the second tank via the heat pump pipe 52. Come back inside 4 By this heating circulation cycle, the water stored in the second tank 4 is uniformly heated.

The annual energy consumption efficiency can be greatly improved by combining the heat pump device 5 with the solar heat collector 2.

Alternatively, a heating element (not shown) may be provided inside the first tank 3, and the stored water may be heated by energizing the heating element using midnight power. As a result, even if the solar heat collecting device 2 is operated due to bad weather or the like, even if the water stored in the first tank 3 cannot be heated sufficiently, it is heated at a low electricity charge at midnight. be able to.

Although the floor lower part 9 is not illustrated, it is composed of a foundation, a floor, and an internal space, and the internal space is sealed. The inner side wall is provided with a heat insulating member by urethane foam spraying work or the like.

The foundation of the lower floor 9 is not installed with a vent to the outside so that air outside the building does not flow in, and the air in the interior space is shut off from the outside air and sealed. Since the lower floor 9 is used as a temperature control tank, the internal space of the lower floor 9 is configured to be in a sealed state so that outside air does not directly flow into the lower floor 9.

In a foundation part under the floor of a general house, for example, a cloth foundation, the structure has good ventilation with the outside in order to prevent moisture in the lower floor 9, the ventilation opening can be opened and closed, and the ventilation opening is closed. Similar effects can be obtained.

The first pipe 6 is arranged so as to meander inside the lower floor 9. The water passing through the first pipe 6 is supplied to the first tank 3 or the second tank 4 via the third direction control valve 73. A heat shield sheet 11 is laid under the first pipe 6. The heat shield sheet 11 is a sheet having heat insulation properties, and is preferably an aluminum sheet, for example.

Further, a circulation pump 64 is provided in the first pipe 6. Thereby, the hot water supplied from the second tank 4 can be circulated in a stable state to the second tank 4 via the first pipe 6.

The second pipe 8 has one end connected to the first directional control valve 71 and the other end connected to the second directional control valve 72. By switching the first directional control valve 71, the water source pipe 100 The tap water supplied from is supplied to the second directional control valve 72 via the second pipe 8.

The first direction control valve 71 is a three-way valve, and includes a water source pipe 100 that supplies tap water, a pipe p5 that is connected to the first tank 3, and a second end that is connected to the second direction control valve 72 at one end. Connected to tube 8. The first direction control valve 71 can supply the tap water supplied from the water source pipe 100 to either the pipe p5 or the second pipe 8 by switching.

The pipe p5 is preferably connected to the bottom of the first tank 3 where water having a relatively low temperature stays. Thereby, mixing with the warm water staying above the inside of the first tank 3 can be avoided.

The second direction control valve 72 is a three-way valve, and includes a pipe p2 that supplies hot water supplied from the second tank 4, a second pipe 8 that supplies tap water supplied from the water source pipe 100, and a first pipe. 6 is connected to the other end 6b. The second direction control valve 72 can supply either the hot water supplied from the pipe p <b> 2 or the tap water supplied from the second pipe 8 to the first pipe 6 by switching.

The third direction control valve 73 is a three-way valve, and is connected to one end 6a of the first pipe 6, a pipe p3 connected to the first tank 3, and a pipe p4 connected to the second tank 4. By switching, the third direction control valve 73 can supply tap water or hot water supplied from the first pipe 6 to either the pipe p3 or the pipe p4.

The pipes p3 and p4 are preferably connected to the bottoms of the first tank 3 and the second tank 4. Thereby, mixing with the warm water staying above the first tank 3 and the second tank 4 can be avoided.

The first control unit 81 controls switching of the first directional control valve 71 and the second directional control valve 72, and may be either electronic control or mechanical control.

In the summer, when it is recognized that the floor needs to be cooled, the first control unit 81 is operated to switch the first direction control valve 71 and the second direction control valve 72 so that the water supplied from the water source pipe 100 is A path passing through the second pipe 8 and the first pipe 6 is formed. When hot water is supplied to the bath 10 via the pipe p 6 connected to the second tank 4, tap water having a low temperature is supplied from the water source pipe 100, and the second pipe 8 and the first pipe 6 are used to supply the first water. It is supplied to the bottom of one tank 3 or the second tank 4. The tap water having a low temperature supplied to the first pipe 6 is heat-exchanged with the air stored in the internal space of the lower floor 9 to lower the temperature of the lower floor 9, while the temperature of the tap water increases.

In winter, when it is recognized that floor heating is necessary, the first control unit 81 is operated to switch the first directional control valve 71 and the second directional control valve 72 so that the hot water supplied from the second tank 4 Then, a path that circulates to the second tank 4 via the first pipe 6 is formed. At the same time, the circulation pump 64 is started. Thereby, the hot water supplied to the 1st pipe | tube 6 is heat-exchanged with the air of the interior space of the floor lower part 9, and the temperature of the interior space of the floor lower part 9 rises, On the other hand, the temperature of warm water falls.

The second control unit 82 is based on the detected values of the temperature sensor 32 provided in the first tank 3 and the temperature sensor 62 provided at one end 6 a of the first pipe 6. The switching is controlled, and either electronic control or mechanical control may be used.

When the detected value of the temperature sensor 62 is smaller than a predetermined threshold value, for example, the detected value of the temperature sensor 32, the third direction control valve 73 is switched, and hot water or tap water passing through the first pipe 6 is changed. The first tank 3 is supplied via the pipe p3. As a result, hot water having a higher temperature staying above the first tank 3 is supplied to the second tank 4 via the connection pipe p1. Further, when the detected value of the temperature sensor 62 exceeds a predetermined threshold value, for example, the detected value of the temperature sensor 32, the third direction control valve 73 is switched to supply hot water or tap water passing through the first pipe 6. The second tank 4 is supplied via the pipe p4. As a result, hot water or tap water having a temperature higher than the hot water staying above the first tank 3 is supplied to the second tank 4 via the pipe p4. Thereby, floor air conditioning in summer can be performed efficiently.

The operation of the floor air conditioning system 1 in summer will be described with reference to FIG.

In summer, when it is recognized that the floor needs to be cooled, the first control unit 81 is operated to switch the first direction control valve 71 and the second direction control valve 72. As a result, a path through which the water supplied from the water source pipe 100 reaches the first tank 3 via the second pipe 8 and the first pipe 6 is formed. That is, by supplying hot water stored in the second tank 4 to the bath 10, a path through which tap water having a low temperature flows is formed in the first pipe 6. When hot water in the second tank is supplied to the bath 10, tap water having a low temperature is supplied to the first pipe 6. The tap water having a low temperature is subjected to heat exchange with the heat stored in the internal space of the lower floor 9, and the temperature of the internal space of the lower floor 9 is lowered, while the temperature of the tap water is increased.

Also, the second control unit 82 is operated to switch the third direction control valve 73. When the detected value of the temperature sensor 62 is smaller than the detected value of the temperature sensor 32, the hot water or tap water passing through the first pipe 6 is switched to a path for supplying the first tank 3 via the pipe p3. As a result, hot water having a higher temperature staying above the first tank 3 is supplied to the second tank 4 via the connection pipe p1. When the detection value of the temperature sensor 62 exceeds the detection value of the temperature sensor 32, the hot water or tap water passing through the first pipe 6 is switched to a path for supplying the second tank 4 via the pipe p4. As a result, hot water or tap water having a temperature higher than the hot water staying above the first tank 3 is supplied to the second tank 4 via the pipe p4. Thereby, the hot water supply to the bath 10 can be performed efficiently.

The operation of the floor air conditioning system 1 in winter will be described with reference to FIG.

The inside of the second tank 4 is filled with warm water heated to a substantially constant temperature by the heat pump device 5. In winter, when it is recognized that floor heating is necessary, the first control unit 81 is operated to switch between the first direction control valve 71 and the second direction control valve 72. Thereby, the path | route through which the hot water stored in the 2nd tank 4 passes the piping p2 and the 1st pipe | tube 6 is formed. When the circulation pump 64 is operated, the hot water stored in the second tank 4 passes through the first pipe 6. In this process, the air in the internal space of the lower floor 9 is subjected to heat exchange, and the temperature of the internal space of the lower floor 9 is increased, while the temperature of the hot water in the first pipe is decreased.

Also, the second control unit 82 is operated to switch the third direction control valve 73. When the detected value of the temperature sensor 62 is smaller than the detected value of the temperature sensor 32, the hot water passing through the first pipe 6 is switched to a path for supplying the first tank 3 via the pipe p3. Thereby, a circulation path is formed in which the hot water stored in the second tank 4 returns to the second tank 4 again via the first pipe 6 and the first tank 3. Further, hot water having a higher temperature staying above the first tank 3 is supplied to the second tank 4 via the connection pipe p1. When the detected value of the temperature sensor 62 exceeds the detected value of the temperature sensor 32, the hot water passing through the first pipe 6 is switched to a path for supplying the second tank 4 via the pipe p4. Thus, a circulation path is formed in which the hot water stored in the second tank 4 returns to the second tank 4 again via the first pipe 6. Further, hot water having a temperature higher than that of the hot water staying above the first tank 3 is supplied to the second tank 4 via the pipe p4. Thereby, floor air conditioning in winter can be performed efficiently.

As shown in FIG. 4, when hot water is supplied to the bath 10, tap water is supplied from the water source pipe 100 to the first tank 3 via the pipe p5. At the same time, hot water staying above the first tank 3 is supplied to the bottom of the second tank 4 via the connection pipe p1. Thereby, since hot water higher than tap water is supplied to the 2nd tank 4, the hot water supply to the bath 10 can be performed efficiently.

As described above, the floor air-conditioning system according to the present invention has been described in detail on the basis of the present embodiment, but the present invention is not limited to the above-described embodiment, and various types can be made without departing from the spirit of the invention. Of course, even if it is modified, it belongs to the technical scope of the present invention.

The air conditioning of the lower floor 9 can be provided with energy saving, and its industrial utility value is great.

1: Floor air conditioning system 2: Solar thermal collector 3: 1st tank 4: 2nd tank 5: Heat pump device 6: 1st pipe 8: 2nd pipe 9: Lower floor 11: Thermal insulation sheet 32: Temperature sensor 62: Temperature sensor 71: 1st direction control valve 72: 2nd direction control valve 73: 3rd direction control valve 81: 1st control part 82: 2nd control part 100: Water supply pipe p1: Connection pipe

Claims

A solar heat collector,
A first tank for storing water to be heated by the solar heat collector;
A heat pump device;
A second tank for storing water to be heated by the heat pump device;
A connecting pipe connecting the top of the first tank and the bottom of the second tank;
A first pipe arranged at the lower part of the floor and having one end connected to the first tank;
A first direction control valve connected to one end of the water source pipe and the second pipe and the first tank;
A second directional control valve connected to the second tank, the other end of the first pipe, and the other end of the second pipe;
By switching between the first directional control valve and the second directional control valve, the water stored in the first tank is switched to a path passing through the second tank and the first pipe. A floor air-conditioning system that supplies water to the tank or supplies water from the water source pipe to the first tank by switching to a path that passes through the second pipe and the first pipe.
A third directional control valve connected to one end of the first pipe, the first tank, and the second tank;
2. The water passing through one end of the first pipe is supplied to the first tank or supplied to the second tank by switching the third direction control valve. Floor air conditioning system as described in.
A first control unit connected to the first directional control valve and the second directional control valve;
The floor according to claim 1, wherein the first control unit controls a flow of water passing through the first tank, the second tank, the first pipe, and the second pipe. Air conditioning system.
A temperature sensor provided at one end of the first tank and the first pipe;
A second control unit connected to the third directional control valve;
The second control unit controls either a flow for supplying water passing through the first pipe to the first tank or a flow for supplying the second tank based on a detection value of the temperature sensor. The floor air-conditioning system according to claim 2.
Do not install outside air vents in the lower floor, block the air inside the lower floor from the outside, or make the air vents openable and closable, and open and close the air vents to make a sealed state The floor air-conditioning system according to any one of claims 1 to 4, wherein the floor air-conditioning system is characterized.
The floor air-conditioning system according to any one of claims 1 to 5, wherein a heat shield sheet is laid under the first pipe.