JP2017150778A - Dehumidifying/reheating air-conditioning system utilizing ground thermal energy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dehumidifying/reheating air-conditioning system materializing energy saving in both of heating and cooling by utilizing ground thermal energy as a heat source for reheating.SOLUTION: An air conditioning system 1 is provided that is composed of a heat pump circuit 2 comprising an evaporator 21 and a condenser 22, a cold/hot water coil 32 supplied with cold/hot water from the heat pump circuit 2, and a reheater 33. In the air conditioning system 1, in cooling, the cooled cold water is supplied from the evaporator 21 to the cold/hot water coil 32, the cold water cooled by a ground thermal energy exchanger 4 provided in the ground is heated by the condenser 22 and supplied to the reheater 33, the water heated by the reheater 33 is circulated to the ground thermal energy exchanger 4, and in heating, the heated hot water is supplied from the condenser 22 to the cold/hot water coil 32, the hot water heated by the ground thermal energy exchanger 4 provided in the ground is cooled by the evaporator 21, and circulated to the evaporator 21 without being conducted to the reheater 33.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a dehumidifying and reheating air conditioning system that uses geothermal heat for reheating.

Conventionally, during cooling in summer, low temperature chilled water with a water inlet temperature of 6 to 7 ° C is used to cool with a cooling coil. However, there are cases where dehumidification cannot be achieved if the temperature is controlled. In some cases, indoor residents feel cold.
Then, in order to make it suitable temperature after cooling dehumidification, as shown, for example in patent document 1, the air-conditioning apparatus which performs the dehumidification reheating which provides a reheating coil is developed, but it is except a cooling heat source for reheating. In addition, the heating power from the hot water heat source and the electric heater was consumed.
The structure of this prior art will be described with reference to FIGS. 1 and 2. In FIG. 1, a cold water coil a for cooling and dehumidification and a reheating coil b for setting an appropriate temperature downstream thereof are installed, and the outside air OA is cooled by a cold water coil. The humidity was controlled with low-temperature cold water of about 7 ° C., for example, and the temperature was controlled with hot water of about 46 ° C., for example, with the subsequent reheating coil b, and this conditioned air was supplied indoors with a supply fan c. Normally, an air filter d is disposed upstream of the cold water coil a, and a humidifier e is disposed upstream of the downstream air supply fan c of the reheating coil b.

When the air conditioning state when operating in this configuration is represented by the air diagram of FIG. 2, cooling dehumidification is a process of reducing the large outside air A load (high air temperature) to the dew point temperature B at a time with the low temperature cold water of the cold water coil a. I am doing. For this reason, in order to obtain an appropriate temperature C, there is a problem that, in addition to the cooling heat source, hot water heat source power and heating power of the reheating coil c by an electric heater are consumed.
By the way, the demand in the social situation in recent years is the reduction of power consumption, and Cool Biz, which is being taken as an environmental measure by the Ministry of the Environment, is a campaign to devise clothes and set the room temperature to 28 ° C. However, in the air conditioning system of the cooling system (normal air conditioning), the humidity becomes high and it becomes uncomfortable at an indoor temperature of 28 ° C, and eventually the set temperature is lowered, and in order to solve it, Although it is necessary to use a dehumidifying and reheating air conditioning system that reduces the humidity even at the same room temperature of 28 ° C., this dehumidifying and reheating air conditioning system also has the above-described problems.

Therefore, as disclosed in Patent Document 2, the present inventors have implemented dehumidification re-use that realizes energy saving by using the return water of the cold water coil as a heat source for reheating in the dehumidification reheat air conditioning system using cold water. It proposes an air conditioner that heats.
This dehumidifying and reheating air conditioning system is an air conditioning system that takes in outside air, cools it, reheats and supplies air, and arranges a medium temperature cold water coil upstream for cooling, a low temperature cold water coil downstream, and further A reheating coil is arranged downstream, the supply of chilled water to the medium temperature chilled water coil is lower than the outside air, and the temperature is higher than the temperature of the chilled water to the low temperature chilled water coil. It is a dehumidification reheat air-conditioning system by the cold water which cools to the target absolute humidity and supplies the return cold water after cooling of the intermediate temperature cold water coil to the reheat coil.
However, this dehumidifying and reheating air conditioning system not only requires a medium temperature cold water coil and a low temperature cold water coil, but also requires further energy saving.
In addition, in the air conditioning system, an apparatus in which underground heat is interposed as a heat source is disclosed as in Patent Document 2.

JP 2010-78312 A JP 2014-62651 A JP 2009-36413 A

  The present invention has been made in view of the above-described problems, and in a dehumidifying and reheating air conditioning system in which humidity and temperature can be individually controlled, heating and cooling are performed using geothermal heat as a heat source for reheating. However, it is intended to provide a dehumidifying and reheating air conditioning system that can save energy and simplify the number of coils.

In order to solve the above-mentioned problems, the invention of claim 1 is an air conditioning system comprising a heat pump circuit provided with an evaporator and a condenser, a cold / hot water coil supplied with cold / hot water from the heat pump circuit, and a reheater. In an air conditioning system equipped with a vessel,
During cooling, the chilled / hot water coil is supplied with chilled water cooled from the evaporator, and the chilled water cooled by the underground heat exchanger embedded in the ground is heated by the condenser and supplied to the reheater. Circulating water that warms the reheater to the underground heat exchanger,
During heating, warm water heated from the condenser is supplied to the cold / hot water coil, and warm water is heated by the underground heat exchanger provided in the ground, and is not conducted to the reheater by the condenser. A dehumidifying and reheating air conditioning system using geothermal heat characterized by being circulated through the condenser.
According to a second aspect of the present invention, there is provided a three-way valve having a mixing control function and a bypass function between the inlet side and the outlet side of the reheater. This is a dehumidifying and reheating air conditioning system.

According to the invention of the dehumidifying and reheating air conditioning system using geothermal heat according to claim 1, in the dehumidifying and reheating air conditioning system capable of individually controlling the humidity and temperature, the underground heat is used as a heat source for reheating. Energy saving is achieved even during heating and cooling, and the number of coils can be simplified. In particular, instead of using the reheat heating coil and electric heater for reheating the conventional system, ground heat, which is natural energy, was used, so the heat source that burns and heats the fuel and the electric heater these heat sources It becomes unnecessary. That is, no hot water heat source power (steam generation fuel) or heating power is required, and the energy saving effect can be enhanced.
In addition, the COP, which is the cooling / heating capacity per 1 kW of power consumption, can be improved. For example, taking summer as an example, in a general heat pump system, heat is radiated on the outdoor unit side by outside air. However, when outside air is used, heat must be radiated by outside air around 30 ° C. Here, if geothermal heat is used, it is possible to radiate heat with water at about 15 ° C., and the heat radiating efficiency is improved as compared to when using outside air.
According to the invention of the dehumidifying and reheating air conditioning system using the geothermal heat of claim 2, the three-way valve having the mixing control function and the bypass function is provided between the inlet side and the outlet side of the reheater. About a heater, the reheat control at the time of air_conditioning | cooling in summer etc. can be performed, and the reheat operation stop at the time of heating in winter can be performed.

Schematic diagram of conventional dehumidifying and reheating air conditioner using water coil, Air line diagram explaining the state change of conventional air, Configuration schematic diagram at the time of cooling such as summer of the dehumidification reheat air conditioning system using the geothermal heat of Example 1, BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a dehumidifying and reheating air conditioning system that uses geothermal heat in Example 1 during heating in winter and the like.

  A dehumidifying and reheating air conditioning system and apparatus using geothermal heat of the present invention will be described with reference to the drawings.

  The outline of the dehumidifying and reheating air conditioning system and apparatus according to the embodiment of the present invention will be described with reference to FIG. 3. In the dehumidifying and reheating air conditioning system 1, the heat pump circuit 2 includes the first heat exchanger 21 and the second heat exchanger 22. , Compressor 23, (electronic) expansion valve 24, piping 25 connecting them, and four-way valve 26, air conditioning comprising air filter 31, cold / hot water coil 32, reheater 33, humidifier 34, and blower 35. The vessel 3 is connected to the heat pump circuit 2 and the underground heat exchanger 4.

[Configuration and operation during cooling]
Here, the configuration and operation during cooling mainly in summer will be described. As shown in FIG. 3, the refrigerant compressed by the compressor 23 of the heat pump circuit 2 is supplied from the output port 23 b of the compressor 23 to the four-way valve 26. Is introduced into the input / output port 221a of the heat source coil 221 of the second heat exchanger 22 constituting the condenser cooled via the heat source (input port in summer), and the input / output port of the heat source side coil 221 (output port in summer) 221b is introduced into the input / output port 211a (input port in summer) of the heat source coil 211 of the first heat exchanger 21 constituting the evaporator for heating via the electronic expansion valve 24, and the input / output port of the heat source side coil 211 ( In summer, the refrigerant circulates from the output port 211b through the four-way valve 26 so as to be introduced into the input port 23a of the compressor 23.
On the other hand, the air conditioner 3 of the dehumidifying / reheating air conditioning system 1 is arranged in the order of the air filter 31, the cold / hot water coil 32, the reheater 33, the humidifier 34, and the blower 35 to the room from the outside air OA side.
Moreover, although this invention is the dehumidification reheat air-conditioning system 1 using geothermal heat, it utilizes the geothermal heat which is normally 10 to 20 degreeC which is the underground G to the depth of 150 m from the ground surface. For this reason, the underground heat exchanger 4 is provided with an underground heat exchange pipe 41 embedded in the ground constituted by a vertical U-shaped pipe and a horizontal embedded zigzag pipe. In addition, even if geothermal heat is not underground, well water may be used as long as the temperature is stable.

Such a heat pump circuit 2, the air conditioner 3, and the underground heat exchanger 4 are connected by piping and various control valves. This will be described with reference to FIG. When connected to the cold water coil 32, the relationship with the first heat exchanger 21 will be described.
As shown in FIG. 3, the cold / hot water coil 32 and the 1st heat exchanger 21 are connected by the air conditioning piping 5 and various valves.
More specifically, the input / output port 32a of the cold / hot water coil 32 is connected to an input / output port (output port in summer) 212b and a pump 56 (in summer) by an on-off valve 51. The pump may be placed anywhere in the flow path.) (White valve is open, black valve is closed, solid line pipe is open, dotted line pipe is closed) In the first heat exchanger (evaporator) 21 via the on-off valve 52 by a flow rate control two-way valve 55 that controls the flow rate of the air from the output port 32b. The heat receiving coil 212 is connected to an input / output port (input port in summer) 212a to circulate. The on-off valves 53 and 54 are closed during cooling and are not operating.
Therefore, in the summertime cooling operation, the first heat exchanger 21 constituting the evaporator of the heat pump circuit 2 cools the coolant water from about 12 ° C. to about 7 ° C. and supplies it to the cold / hot water coil 32. The air is cooled with water of about 7 ° C. in the cold / hot water coil 32 and warmed to about 12 ° C., but again the water as the refrigerant is about 12 ° C. by the first heat exchanger 21 constituting the evaporator of the heat pump circuit 2. Circulate to cool to about 7 ° C.

One of the features of the present invention is that geothermal heat is used in the reheater 33. As shown in FIG. 3, the reheater 33, the second heat exchanger 22, and the underground heat exchanger 4 are used. Are connected by the reheat pipe 6 and various valves.
More specifically, the input / output of the heat receiving coil 222 of the second heat exchanger (condenser) 22 is connected to the input port 33a of the reheater 33 by an on-off valve 61 and a flow rate control three-way valve 65 for controlling the flow rate on the way. It is connected to the port (output port in summer) 222b (the white valve is open, the black valve is closed, the solid line pipe is open, and the dotted line pipe is closed as in the case of the pipe 5).
The water heated by the reheater 33 and cooled by the regenerator 33 is discharged from the output port 33b and a part of the warm water from the input / output port (output port in summer) 222b. Is mixed with the flow control three-way valve 65 and the temperature is raised slightly, and then supplied to the underground heat exchange pipe 41 of the underground heat exchanger 4 to be cooled, and the second heat exchange is performed via the pump 66 and the opening / closing valve 62. The heat is supplied to the input / output port (input port in summer) 222a of the heat receiving coil 222 of the condenser (condenser) 22 and circulates. The on-off valves 63 and 64 are closed during cooling and are not operating.

Accordingly, during the cooling operation in summer, the second heat exchanger 22 constituting the condenser of the heat pump circuit 2 heats the coolant water from about 15 ° C. to about 20 ° C. and supplies it to the reheater 33. The reheater 33 heats the air with water of about 20 ° C., and is cooled with air and then cooled to about 15 ° C. However, a part of the warm water of the condenser is mixed by the flow control three-way valve 65. The temperature is raised to about 19 ° C., supplied to the underground heat exchanger 4, cooled by underground heat of about 15 ° C., and the water of about 15 ° C. is used as a condenser of the heat pump circuit 2. The water, which is the refrigerant, is circulated by the two heat exchangers 22 so as to be heated from about 15 ° C. to about 20 ° C.
In this way, the use of geothermal heat for heating the reheater 33 results in the use of chilled water (hot water during heating) that uses geothermal heat and is supplied using water-cooled heat pump technology. In addition, the power consumption required for reheating is reduced, the load on the heat pump circuit 2 is reduced, and this contributes to energy saving.

  Moreover, although the displayed temperature in each pipe of the present embodiment is an average and typical one at the time of cooling, of course, the displayed temperature varies depending on the year, but the required temperature in the room or the like. Corresponding to the humidity, the flow rate of the flow control two-way valve 55 and the flow control three-way valve 65 may be controlled, and the underground heat is usually stable at about 15 ° C., but varies from 10 ° C. to 20 ° C. In this case, the water temperature supplied to the ground is adjusted by the flow control three-way valve 65 to be higher than the ground heat temperature, and the water temperature is cooled by the ground heat to cool the second heat exchanger (condensation). 2), the second heat exchanger (condenser) 22 can be further cooled, so that the load of temperature drop in the compressor 23 can be reduced, resulting in energy saving. Become.

[Configuration and operation during heating]
Next, the configuration and operation during heating mainly in winter will be described. As shown in FIG. 4, the difference from the cooling in FIG. 3 is that the reheater 33 is not required to operate and the underground heat Is exclusively used for cooling the second heat exchanger 22 constituting the evaporator during heating in the heat pump circuit 2. For this reason, in the heat pump circuit 2, the four-way valve 26 is switched to cool the first heat exchanger. The evaporator during operation is operated as a condenser during heating, and the condenser during cooling is operated as an evaporator during heating.
The configuration and operation during heating mainly in winter will be described. First, as shown in FIG. 4, since the evaporator and the condenser are interchanged during cooling, the refrigerant compressed by the compressor 23 of the heat pump circuit 2 Is introduced from the output port 23b of the compressor 23 to the input / output port 221b (the input port in winter) of the heat source coil 211 of the first heat exchanger 21 that constitutes the condenser cooled through the four-way valve 26. The input / output port of the heat source coil 221 of the first heat exchanger 22 constituting the evaporator to be cooled from the input / output side (output port in winter) 211a through the electronic expansion valve 24 from the side coil 211 (in winter, the input port) ) 221b and circulates so as to be introduced from the input / output port 211a of the heat source side coil 211 (output port in winter) via the four-way valve 26 to the input port 23a of the compressor 23.

Such a heat pump circuit 2, the air conditioner 3, and the underground heat exchanger 4 are connected to each other by piping and various control valves. However, since heating is performed, the on / off valve of the heating / cooling piping 5 is the time of cooling in FIG. 51, 52, 53, 54 and the opening / closing valves 61, 62, 63, 64 of the air conditioning pipe 6 are reversed.
First, the relationship between the cold / hot water coil (hot water coil in winter) 32 and the first heat exchanger 21 during heating in winter will be described.
As shown in FIG. 4, the cold / hot water coil 32 and the first heat exchanger 21 are connected to each other by a cooling / heating pipe 5 and various valves. Connected to the input / output port 212a of the heat receiving coil 212 of the evaporator (evaporator) (output port in winter) (white valve is open, black valve is closed, solid line pipe is open, dotted line pipe is closed), cold / hot water The air is heated by the heated water of the coil 32, and the slightly cooled water of the cold / hot water coil 32 is supplied with a first heat via a flow control two-way valve 55 and an on-off valve 54 for controlling the flow rate on the way from the output port 32b. The heat exchanger coil (evaporator) 21 is connected to an input / output port (input port in winter) 212b and circulates. The on-off valves 51 and 52 are closed during heating and are not operating.
Therefore, the operation at the time of heating in winter is performed by heating the water that is the refrigerant from about 40 ° C. to about 45 ° C. by the first heat exchanger 21 that constitutes the condenser of the heat pump circuit 2 and supplying it to the cold / hot water coil 32. The air is heated with about 45 ° C. water in the cold / hot water coil 32 and heated to cool to about 40 ° C., but again the water as the refrigerant is cooled by the first heat exchanger 21 that constitutes the condenser of the heat pump circuit 2. Circulate by heating from about 40 ° C to about 45 ° C.

Next, the configuration and operation of the evaporator (second heat exchanger 22), the reheater, and the underground heat exchanger during heating mainly in winter will be described. As shown in FIG. 4, the reheater Since 33 does not operate, the second heat exchanger 22 and the underground heat exchanger 4 are connected by the underground heat exchange pipe 41 and various valves.
As described above, the second heat exchanger 22 of the heat pump circuit 2 operates as an evaporator. First, the input / output port (output port in winter) 222a of the heat receiving coil 222 of the second heat exchanger (evaporator) 22 is used. Cooled water at about 10 ° C. is supplied from the on-off valve 63 to the underground heat exchange pipe 41 of the underground heat exchanger 4 through the flow control three-way valve 65 and from 10 ° C. to 15 ° C. The temperature is warmed to 0 ° C., and is supplied to the input / output port (input port in winter) 222 b of the heat receiving coil 222 of the second heat exchanger (evaporator) 22 through the pump 66 and the on-off valve 64 and circulates. The on-off valves 61 and 62 are closed during heating and are not operating.
Therefore, the operation at the time of heating in winter is performed by cooling the water, which is the refrigerant, from about 15 ° C. to about 10 ° C. by the second heat exchanger 22 constituting the evaporator of the heat pump circuit 2 and supplying the water cooled by the evaporator at a flow rate. By the control three-way valve 65, the reheater 33 is bypassed and supplied to the underground heat exchanger 4 and warmed by underground heat of about 15 ° C. The water of about 15 ° C is supplied to the evaporator of the heat pump circuit 2. The water which is a refrigerant | coolant is circulated so that it may cool from about 15 degreeC to about 10 degreeC with the 2nd heat exchanger 22 to comprise.

Thus, by using the hot water supplied using the ground heat and using the water-cooled heat pump technology, the power consumption required for heating is reduced, the load on the heat pump circuit 2 is reduced, and the energy is saved. . The geothermal heat may not be underground, but well water may be used as long as the temperature is stable.
In addition, the displayed temperature in each pipe of the present embodiment is an average and typical temperature as in the above-described cooling, but the flow rate control is performed according to the required temperature and humidity in the room. The flow rate of the direction valve 55 and the flow rate control three-way valve 65 may be controlled, and the load of temperature rise in the compressor 23 can be reduced, resulting in energy saving.

As described above, according to the embodiment of the dehumidifying and reheating air conditioning system using the geothermal heat of the present invention, in the dehumidifying and reheating air conditioning system in which the humidity and temperature can be individually controlled, the heat source for reheating Using medium heat, energy can be saved even during heating and cooling, and the number of coils can be simplified. In particular, instead of using the reheat heating coil and electric heater for reheating the conventional system, ground heat, which is natural energy, was used, so the heat source that burns and heats the fuel and the electric heater these heat sources It becomes unnecessary. That is, no hot water heat source power (steam generation fuel) or heating power is required, and the energy saving effect can be enhanced.
In addition, the COP, which is the cooling / heating capacity per 1 kW of power consumption, can be improved. For example, taking summer as an example, in a general heat pump system, heat is radiated on the outdoor unit side by outside air. However, when outside air is used, heat must be radiated by outside air around 30 ° C. Here, if geothermal heat is used, it is possible to radiate heat with water at about 15 ° C., and the heat radiating efficiency is improved as compared to when using outside air.
In addition, since a three-way valve with a mixing control function and a bypass function is provided between the inlet side and outlet side of the reheater, the reheater can be controlled for reheating during cooling such as in summer, and heating in winter The operation of reheating at the time can be stopped.
Of course, the present invention is not limited to the above-described embodiments as long as the features of the present invention are not impaired.

G ...
1. Dehumidification reheat air conditioning system,
2. Heat pump circuit,
21 .. First heat exchanger, 211 ... Heat source coil, 211a, 211b, I / O port,
212 ... Heat receiving coil, 212a, 212b ... Input / output port,
22 .... second heat exchanger, 221 ... heat source coil, 221a, 221b ... input / output port,
222 .. Heat receiving coil, 222a, 222b ..I / O port,
23 .... Compressor, 23a ... Input port, 23b ... Output port,
24. ・ Electronic expansion valve, 25 ・ ・ Piping, 26 ・ ・ Four-way valve 3 ・ ・ Air conditioner, 31 ・ Air filter,
32 .... Cooled and hot water coil, 32a ... Input port, 32b ... Output port,
33..Reheater, 33a..Input port, 33b..Output port,
34 ... Humidifier, 35 ... Blower,
4 .... Ground heat exchanger, 41 ... Ground heat exchange piping 5, ... Air conditioning piping,
51, 52, 53, 54 ... Open / close valve, 55 ... Flow control two-way valve, 56 ... Pump 6 ... Reheat piping, 61, 62, 63, 64 ... Open / close valve, 65 ... Flow control three-way valve,
66 .. Pump

In order to solve the above-mentioned problems, the invention of claim 1 is an air conditioning system comprising a heat pump circuit provided with an evaporator and a condenser, a cold / hot water coil supplied with cold / hot water from the heat pump circuit, and a reheater. In an air conditioning system equipped with a vessel,
During cooling, the chilled / hot water coil is supplied with chilled water cooled from the evaporator, and the chilled water cooled by the underground heat exchanger embedded in the ground is heated by the condenser and supplied to the reheater. Circulating water that warms the reheater to the underground heat exchanger,
During heating, the supplies warmed hot water from the condenser, to conduct hot water warmed by underground heat exchanger provided in the ground in the reheater cooled by the evaporator to the cold and hot water coil a dehumidifying reheat air-conditioning system utilizing geothermal heat, characterized in that was circulated to the evaporator without.
According to a second aspect of the present invention, there is provided a three-way valve having a mixing control function and a bypass function between the inlet side and the outlet side of the reheater. This is a dehumidifying and reheating air conditioning system.

Such a heat pump circuit 2, the air conditioner 3, and the underground heat exchanger 4 are connected by piping and various control valves. This will be described with reference to FIG. When connected to the cold water coil 32, the relationship with the first heat exchanger 21 will be described.
As shown in FIG. 3, the cold / hot water coil 32 and the 1st heat exchanger 21 are connected by the air conditioning piping 5 and various valves.
More specifically, the input / output port 32a of the cold / hot water coil 32 is connected to an input / output port (output port in summer) 212b and a pump 56 (in summer) by an on-off valve 51. The pump may be placed anywhere in the flow path.) (White valve is open, black valve is closed, solid line pipe is open, dotted line pipe is closed) In the first heat exchanger (evaporator) 21 via the on-off valve 52 by a flow rate control two-way valve 55 that controls the flow rate of the air from the output port 32b. (the summer input port) of the input and output ports of the heat receiving coil 212 are consolidated into 212a circulates. The on-off valves 53 and 54 are closed during cooling and are not operating.
Therefore, in the summertime cooling operation, the first heat exchanger 21 constituting the evaporator of the heat pump circuit 2 cools the coolant water from about 12 ° C. to about 7 ° C. and supplies it to the cold / hot water coil 32. The air is cooled with water of about 7 ° C. in the cold / hot water coil 32 and warmed to about 12 ° C., but again the water as the refrigerant is about 12 ° C. by the first heat exchanger 21 constituting the evaporator of the heat pump circuit 2. Circulate to cool to about 7 ° C.

One of the features of the present invention is that geothermal heat is used in the reheater 33. As shown in FIG. 3, the reheater 33, the second heat exchanger 22, and the underground heat exchanger 4 are used. Are connected by the reheat pipe 6 and various valves.
More specifically, the input / output of the heat receiving coil 222 of the second heat exchanger (condenser) 22 is connected to the input port 33a of the reheater 33 by an on-off valve 61 and a flow rate control three-way valve 65 for controlling the flow rate on the way. It is connected to the port (output port in summer) 222b (the white valve is open, the black valve is closed, the solid line pipe is open, and the dotted line pipe is closed as in the case of the pipe 5).
Then, the air is heated by the reheater 33, both the cooling water in the reheater 33 in the reverse is discharged from the output port 33b, output port (summer output port) of the warm water from 222b one Is mixed with the flow control three-way valve 65 and the temperature is raised slightly, and then supplied to the underground heat exchange pipe 41 of the underground heat exchanger 4 to be cooled, and the second heat is supplied via the pump 66 and the opening / closing valve 62. The heat is supplied to the input / output port 222a (input port in summer) 222c of the heat receiving coil 222 of the exchanger (condenser) 22 and circulates. The on-off valves 63 and 64 are closed during cooling and are not operating.

Claims (2)

In an air conditioning system comprising a heat pump circuit provided with an evaporator and a condenser, and an air conditioner comprising a cold / hot water coil and a reheater supplied with cold / hot water from the heat pump circuit,
During cooling, the chilled / hot water coil is supplied with chilled water cooled from the evaporator, and chilled water cooled by a ground heat exchanger provided in the ground is heated by the condenser and supplied to the reheater, Circulating water that warms the reheater to the underground heat exchanger,
During heating, the hot water heated from the condenser is supplied to the cold / hot water coil, and the warm water heated by the underground heat exchanger provided in the ground is cooled by the evaporator and conducted to the reheater. A dehumidifying and reheating air conditioning system using geothermal heat, characterized in that it is circulated through the evaporator without any problems.   The dehumidification reheat air conditioning system using geothermal heat according to claim 1, wherein a three-way valve having a mixing control function and a bypass function is provided between an inlet side and an outlet side of the reheater.

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