JP3420660B2 - Heat source unit, operation method thereof, and air conditioning system using the heat source unit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat source unit, an operating method thereof, and an air conditioning system using the heat source unit. In particular, it is possible to flexibly meet the air conditioning load demand for each individual space and save energy. , Space-saving and air conditioning system with excellent workability.

[0002]

2. Description of the Related Art In recent years, as an air conditioning system for office buildings, etc., it is flexible to the individual air conditioning load required in each air conditioned space in response to increasing cooling load due to intelligent building functions and comfort of office environment. There is an increasing demand for individually distributed air conditioning systems that can meet the above requirements.

There is a multi-system air conditioning system as a typical example of such an individual distributed air conditioning system. In this multi-type air conditioning system, a plurality of indoor units are connected to one outdoor unit, and each indoor unit can be individually controlled to stop operation or set the room temperature. Such a multi-method air conditioning system is ideal for the individual distribution method because it has excellent individual operation control characteristics, and it can also reduce the heat transfer power, so it can also significantly reduce energy consumption. Has been done.

However, when installing the above-mentioned multi-type air conditioning equipment, the length and height difference of the refrigerant pipes connecting the indoor unit and the outdoor unit vary depending on the installation location, and the cooling capacity depends on the installation site. Since it is necessary to individually make predictions, setting of the piping system, and proper adjustment of the oil injection amount, design and construction were complicated.
Further, there is a problem that a large heat source air volume is required as an outdoor air heat source for the outdoor unit.

As a water heat source type individual air conditioning system,
A system has been proposed in which a heat source device such as a boiler or a cooling tower is used, and a water heat source type heat pump unit is connected to the heat source device via a pipe. However, in such a water heat source type individual air conditioning system, it is necessary to supply the heat source water by the central system, a certain amount of installation space for the heat source device is required, and further, the transfer power between the heat source device and each air conditioner is required. There is a problem in that it becomes large or the pipe length becomes long.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the conventional individual distributed air conditioning system as described above, and the purpose thereof is to be utilized conventionally. The indoor exhaust air that has been exhausted without being used is used as a heat source without any need. Therefore, it is apparently unnecessary to connect a heat source such as an outside air heat source, and it is excellent in energy saving due to exhaust heat recovery, and moreover, in each individual air-conditioned space. A new and improved heat source unit, which is effective for building an individually distributed air conditioning system by flexibly responding to partial loads and does not require connection of refrigerant pipes or heat source water pipes from the center, its operating method and It is to provide an air conditioning system using the heat source unit.

[0007]

To solve the above problems, according to a first aspect of the present invention, the following heat source unit is provided. That is, in claim 1, the heat source unit includes first and second heat pump circuits that can be driven independently of each other, and further, the first heat pump circuit includes the first compressor and the first heat medium-hydrothermal heat. A first switching valve for switching the circulation direction of the exchanger and the heat medium, a first heat medium-heat storage tank water heat exchanger and a first heat medium-air heat exchanger, and a first heat medium installed in the heat storage tank. A first heat medium circulation system communicating with the expansion valve and a first heat source water circulation system communicating with the first heat medium-water heat exchanger and the gas-liquid direct contact heat exchanger are provided, and the second heat medium circulation system is provided. The heat pump circuit includes a second compressor and a second switching valve that switches the circulation direction of the heat medium, a second heat medium installed in the heat storage tank, a heat storage tank water heat exchanger, and a second heat medium. A second heat medium circulation system that connects the air heat exchanger and the second expansion valve is provided.

In the heat source unit as described above, as in claim 2, the second heat pump circuit is provided with the second compressor, the second heat medium-water heat exchanger, and the second direction for switching the circulation direction of the heat medium. Second switching medium, a second heat medium-heat storage tank water heat exchanger, a second heat medium-air heat exchanger, and a second expansion valve installed in the heat storage tank. A heat medium circulation system and a second heat source water circulation system in which the second heat medium-water heat exchanger and the gas-liquid direct contact heat exchanger are interposed may be provided.

According to a third aspect, in the heat source unit,
Further, a heat storage tank water circuit including a heat storage tank water circulation system that connects the heat storage tank and the heat storage tank water-air heat exchanger may be provided. Further, as in claim 4, it is preferable that the gas-liquid direct heat exchanger of the heat source unit uses at least indoor exhaust air as a heat source.

According to a second aspect of the present invention, there is provided a method of operating the heat source unit. According to claim 5, the heat source unit provides the heat source of the first heat medium circulation system according to both the heat load state required in the air-conditioned space and the heat storage state of the heat storage tank, or the heat load state, It is operated so as to switch to either one or both of the heat source water passing through the first heat medium-water heat exchanger and the heat storage tank water in the heat storage tank.

According to a sixth aspect of the present invention, the heat source unit has a first heat load state in the air-conditioned space, a heat load state in the heat storage tank, or a heat load state.
The heat source of the heat medium circulation system is switched to either one or both of the heat source water flowing through the first heat medium-water heat exchanger and the heat storage tank water in the heat storage tank, and the second heat medium circulation system. The heat source is operated to switch to either or both of the heat source water flowing through the second heat medium-water heat exchanger and the heat storage tank water in the heat storage tank.

According to a third aspect of the present invention, there is provided an air conditioning system including the heat source unit. The air conditioning system according to claim 7, comprising the heat source unit, an outside air intake port, an indoor side air supply port, an indoor side return air port, and an outdoor side exhaust port, and the outside air intake port communicates with the indoor side air supply port. In addition, the indoor side return port is provided with an air supply system path formed by selectively communicating with the outdoor side exhaust port and / or the indoor side air supply port, and the outside air is taken in through the outside air intake port as conditioned air. Supply to the air-conditioned space, take in exhaust gas less than the intake outside air into the heat source unit from the air-conditioned space through the indoor side return air port, and recover only the exhaust gas from the air-conditioned space by the gas-liquid direct contact heat exchanger It is configured to be a heat source and / or an exhaust heat destination capable of exhausting heat.

In the above air conditioning system, as described in claim 8, the air supply path communicating with the indoor air supply port is composed of one air supply path and a second air supply path, and the heat of the heat source unit is A medium-air heat exchanger is installed in the first air supply path, and a heat storage tank water-air heat exchanger that uses the heat storage tank water of the heat storage tank as a heat source is installed in the second air supply system path. It is preferable to configure. Then, as described in claim 9, the air supply by the first air supply path is supplied to the first region in the air-conditioned space, and the air supply by the second air supply path is supplied by the second area in the air-conditioned space. It is preferably configured to supply the area. Further, as described in claim 10, the air in the first air supply path is connected to the second air supply path and / or
Alternatively, it is preferable to provide a switching device such as a duct for selectively blowing air to the outdoor exhaust port.

Further, as described in claim 11, it is preferable that the air-conditioned space is divided into one or more air-conditioning units having a predetermined volume, and an air-conditioning system is installed for each air-conditioning unit. .

[0015]

According to the present invention, it is possible to perform air heating and air cooling by the first heat medium-air heat exchanger of the first heat pump circuit, and the cooling load and heating required in each air-conditioned space. It is possible to obtain a self-contained heat source unit capable of flexibly responding to a load and storing excess heat or waste heat as hot water, ice, or cold water in a heat storage tank. At the same time, the second heat pump circuit can perform cooling or heating operation independently of the first heat pump circuit by using the water in the heat storage tank as a heat source, and can cope with various heat load modes of the air-conditioned space. As a result, the heat storage tank can be used as a thermal buffer tank, and the type of heat load (cooling / heating)
Can be recovered when time changes with time (temporal recovery) and when the heat load types of the first air supply system and the second air supply system are different (spatial heat recovery).

According to the second aspect, since the first and second heat pump circuits have the same configuration, the degree of freedom in operation is increased and a redundant circuit can be constructed. Therefore, even if a failure occurs in any of the circuits, it can be dealt with by the single lung operation.

According to the third aspect of the invention, the heat storage recovery circuit can be used as a thermal booster to cope with a start-up or a large air-conditioning load.

According to the fourth aspect, since only the exhaust air introduced into the air-conditioned space for controlling the air quality is equal to or less than the amount of the outside air, it can be used as the heat source or the heat carrier of the heat source unit. It is possible to construct an air-heat-source type air conditioning system that does not require a heat source that is completely distributed and that can omit a separate device such as.

According to the sixth or seventh aspect, the heat source of the heat source unit is switched and optimized in accordance with the heat load state and the heat storage state or the heat load state, so that the heat source unit can be more efficiently and energy-saving. Can drive.

According to the eighth aspect, heat is supplied from the first air supply path by the heat storage tank water-air heat exchanger using the heat storage tank water in the heat storage tank as a heat source and the heat medium-air heat exchanger. The conditioned air having a temperature level different from that of the conditioned air can be supplied from the second air supply path, and the cooling / heating simultaneous operation and the heat recovery operation can be performed.

According to the ninth aspect, it is possible to provide an air conditioning system capable of flexibly coping with different air conditioning loads in the first area and the second area in the air conditioned space.

According to the tenth aspect, for example, the heat load types (cooling / heating) of the first air supply route and the second air supply route are the same, and the heat source type (cold water / hot water) of the heat storage tank and its When the type of heat source required in the second air supply path for taking out heat from the heat storage tank is different, or when the heat storage is exhausted, the air supply in the second air supply path is supplied to the first air supply path. , Can be air-conditioned.

According to the eleventh aspect, the air conditioning system configured as described above has a predetermined air conditioning space (for example, about 100
Since it is installed in a self-contained manner for each pillar interval of about square meters, it is possible to construct an individual distributed air conditioning system that can be easily constructed and managed.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An air conditioning system according to a preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a schematic configuration of an air conditioning system 100 according to the first embodiment of the present invention. The air-conditioning system 100 can be individually installed at intervals of, for example, about 100 square meters, so that construction and management can be easily performed. This air conditioning system 1
00 is mainly composed of a first heat pump circuit 102 and a second heat pump circuit 104.

The first heat pump circuit 102 is composed of a first heat medium circulation system and a first heat source water circulation system. First, the first heat medium circulation system is the first compressor 106.
A first heat medium-water heat exchanger 108, a first four-way valve (first switching valve) 110 that switches the circulation direction of the heat medium,
A first heat medium-heat storage tank water heat exchanger 114, such as a coil installed in the heat storage tank 112 in which the heat medium flows in the pipe, a first heat medium-air heat exchanger 116, and a first expansion valve 118. It is mainly composed of. Then, the first heat medium-water heat exchanger 108 is arranged on the discharge side of the first compressor 106, and one end of the first heat medium-heat storage tank water heat exchanger 114 and the first heat medium-air. The first expansion valve 11 is provided in the conduit between the heat exchanger 116 and one end thereof.
8, the high pressure side of the first four-way valve 110 and the heat medium outlet of the first heat medium-water heat exchanger 108, the low pressure side of the first four-way valve 110 and the suction port of the first compressor 106. , The first four-way valve 1
First connection port 10 and first heat medium-heat storage tank water heat exchanger 11
The other end of No. 4, the second connection port of the first four-way valve 110, and the other end of the first heat medium-air heat exchanger 116 are connected to each other by pipes to form a first heat medium circulation system. . In the figure, reference numeral 119 denotes a first air supply fan, which supplies the first air supply (SA1) heated or cooled by the first heat medium-air heat exchanger 116 to a predetermined area of the air-conditioned space, for example, the interior zone. It is for supply.

The first heat medium-water heat exchanger 108 is connected to the gas-liquid direct contact heat exchanger 120 by the first heat source water circulation system. A circulation pump 122 for sending heat source water from the first heat medium-water heat exchanger 108 to the gas-liquid direct contact heat exchanger 120 is connected to the first heat source water circulation system. As the gas-liquid direct contact heat exchanger 120, for example, a filler,
It is possible to use a small cooling tower specification consisting of an eliminator, a sprinkler pipe, and a water tank.The heat source water is sprinkled from the sprinkler pipe while it is in contact with exhaust air or outside air to exchange heat. Can be cooled or heated and returned to the heat pump circuit. In the figure, reference numeral 121 denotes an exhaust fan, which is for exhausting heat or recovering heat into the exhaust air from the room or the outside air and using it as the heat source of the first heat source water circulation system. Further, a strainer 124 is provided in the first heat source water circulation system to filter foreign matter in the circulating water. Reference numeral 126 in the figure is a valve. It is also possible to connect a water supply system (not shown) to the first heat source water circulation system so as to appropriately supplement the circulation water that is insufficient due to evaporation or the like.

The second heat pump circuit 104 includes a second compressor 130, a second switching valve (four-way valve) 132 for switching the circulation direction of the heat medium, and a second heat installed in the heat storage tank 112. Medium-Heat storage tank water heat exchanger 133 and second heat medium-
It is composed of an air heat exchanger 134 and a second heat medium circulation system which communicates with the second expansion valve 136. 135 in the figure
Is a second air supply fan, and the second air supply (SA) heated or cooled by the second heat medium-air heat exchanger 134.
2) is supplied to a predetermined area of the air-conditioned space, for example, a perimeter zone. The heat mediums circulating in the first and second heat pump circuits may be of the same type, or may be different depending on the characteristics of each heat pump circuit.

Next, the operation of the heat source unit 100 configured as described above will be described. The heat source unit 100 according to the first embodiment can be operated in the following modes.

(A) Cold heat storage operation mode According to the heat source unit 100, cold heat can be stored in the heat storage tank 112 as cold water or ice. During this cold heat storage operation, the second heat pump circuit 104 is stopped and the first heat pump circuit 102 is driven. In order to perform the cold heat storage operation of the first heat pump circuit 102, the first four-way valve 110 is switched to change the heat medium from the first compressor 106 to the first heat medium-water heat exchanger (condenser) 108. → first four-way valve 110 → first heat medium-air heat exchanger (passage)
116-> first expansion valve 118-> first heat medium-heat storage tank water heat exchanger (evaporator) 114-> first four-way valve 110-> first compressor 106 and sequentially circulate in heat storage tank 112. Cold heat is stored as cold water or ice. Exhaust heat (warm heat) is sent from the first heat medium-water heat exchanger (condenser) 108 to the gas-liquid direct contact heat exchanger 120 via the first heat source water circulation system, and exhausted from outside air or indoors. Heat is exhausted into the air.

(B) Thermal heat storage operation mode Even when performing thermal heat storage, the second heat pump circuit 10 is used.
4 stops and drives the first heat pump circuit 102. In order to operate the first heat pump circuit 102 in the thermal heat storage operation, the first four-way valve 110 is switched to transfer the heat medium from the first compressor 106 to the first heat medium-water heat exchanger (passage) 1.
08 → first four-way valve 110 → first heat medium-heat storage tank water heat exchanger (condenser) 114 → first expansion valve 118 → first heat medium-air heat exchanger 116 → first four-way The valve 110 is circulated in sequence from the first compressor 106, and warm heat is stored in the heat storage tank 112 as hot water. The exhaust heat (cold heat) is exhausted into the air passing through the first heat medium-air heat exchanger 119 by driving the first air supply fan 119.

(C) Cooling operation mode During the cooling operation, depending on the size of the air conditioning load required,
The first heat pump circuit 102 which is the main circuit and the second heat pump circuit 104 which is the sub circuit can be switched or operated simultaneously.

During the cooling operation, the first heat pump circuit 10
2 operates as follows. The first four-way valve 110 is switched to change the heat medium from the first compressor 106 → first heat medium-water heat exchanger (condenser) 108 → first four-way valve 110 → first.
Medium-heat storage tank water heat exchanger (supercooler) 114 → first expansion valve 118 → first heat medium-air heat exchanger (evaporator) 1
The first heat medium-air heat exchanger (evaporator) 116 is operated by sequentially circulating 16-> first four-way valve 110-> first compressor 106 and driving first air supply fan 119. It is possible to cool the passing air and supply cold air as the first air supply (SA1) to, for example, the interior zone.
Exhaust heat (warm heat) is the first heat medium-water heat exchanger (condenser) 1
08 is sent to the gas-liquid direct contact heat exchanger 120 via the first heat source water circulation system, and is exhausted to the outside air or the exhaust air from the room. Further, the exhaust heat for supercooling is the first heat medium-
Heat is discharged into the heat storage tank 112 via the heat storage tank water heat exchanger 114.

During the cooling operation, the second heat pump circuit 104 operates as follows. By switching the second four-way valve 132, the heat medium is changed from the second compressor 130 to the second four-way valve 132 to the second heat medium-heat storage tank water heat exchanger (condenser) 1.
33 → second expansion valve 136 → second heat medium-air heat exchanger (evaporator) 134 → second four-way valve 132 → second compressor 130, and the second air supply fan 135 By driving the second heat medium-air heat exchanger (evaporator) 1
The air passing through 34 is cooled, and cold air is supplied to the second air supply (SA
As 2), for example, it can be supplied to the perimeter zone.

(D) Heating operation mode Even during heating operation, depending on the required air conditioning load,
The first heat pump circuit 102 which is the main circuit and the second heat pump circuit 104 which is the sub circuit can be switched or operated simultaneously.

During the heating operation, the first heat pump circuit 10
2 operates as follows. By switching the first four-way valve 110, the heat medium is transferred from the first compressor 106 to the first heat medium-water heat exchanger (passage) 108 to the first four-way valve 110 to the first heat medium-air. Heat exchanger (condenser) 116 → first expansion valve 1
18 → first heat medium-heat storage tank water exchanger (evaporator) 114 →
By sequentially circulating the first four-way valve 110 to the first compressor 106 and driving the first air supply fan 119,
The air passing through the first heat medium-air heat exchanger (condenser) 116 can be heated and hot air can be supplied as the first air supply (SA1) to, for example, the interior zone. Exhaust heat (cold heat) is the first heat medium-heat storage tank water heat exchanger (evaporator)
Heat is exhausted into the heat storage tank 112 via 112.

During the heating operation, the second heat pump circuit 104 operates as follows. By switching the second four-way valve 132, the heat medium is transferred from the second compressor 130 to the second four-way valve 132 to the second heat medium-air heat exchanger (condenser) 134.
→ The second expansion valve 136 → The second heat medium-heat storage tank water heat exchanger (evaporator) 133 → The second four-way valve 132 → The second compressor 130 and the second air supply fan By driving 135, the second heat medium-air heat exchanger (condenser) 1
The air passing through 34 is heated, and warm air is supplied to the second air supply (SA
As 2), for example, it can be supplied to the perimeter zone.

(E) Simultaneous cooling / heating operation mode Since the first and second heat pump circuits according to this embodiment can be driven independently of each other, by driving each heat pump circuit in different operation modes. Cooling / heating simultaneous operation can be performed. The respective operations of the first and second heat pump circuits are the same as those already described in the description of the cooling operation mode and the heating operation mode, and thus duplicated description will be omitted.

FIG. 3 shows a schematic configuration of an air conditioning system 100 'according to the second embodiment of the present invention. The basic configuration of this air conditioning system 100 'is substantially the same as that of the air conditioning system 100 according to the first embodiment of the present invention shown in FIG. In this example and the following examples,
The same reference numerals are given to the configurations and operations of the components having the same functional configuration, and the duplicate description will be omitted.

However, the present air conditioning system 100 'has the first
In addition to the configuration of the air conditioning system 100 according to the embodiment, a heat storage tank water circuit 140 (shown by a dotted line in the figure) is added. The heat storage tank water circuit 140 pumps up cold or hot heat stored in the heat storage tank 112 by the circulation pump 142 and sends it to the heat storage tank water-air heat exchanger 144 to supply the first and / or second air supply ( SA1, SA2) is configured to be cooled or heated. With this configuration,
Utilizing the heat storage tank water circuit 140 as a thermal booster,
At the time of starting or when a large air conditioning load occurs, the heat storage tank 112
The hot or cold heat stored inside can be pumped up and dealt with. Other driving operations are the same as in the previous embodiment.

FIG. 4 shows a schematic configuration of an air conditioning system 200 according to the third embodiment of the present invention. The air conditioning system 200 incorporates the heat source unit 100 described with reference to FIG. 1, and mainly includes a heat source unit section 202 and an air conditioning section 204. Heat source unit section 2
The basic configuration and operation of 02 have already been described with reference to FIG.

The air conditioning unit 204 is provided in the casing 206.
An air path, a first heat medium-air heat exchanger 116, a first air supply fan 119, a second heat medium-air heat exchanger 134,
Second air supply fan 135, gas-liquid direct contact heat exchanger 12
0 and an exhaust fan 121 are housed. The air path includes an outside air intake port 208, a first indoor air supply port 210, a second indoor air supply port 212, an indoor air return port 214, and an outdoor air exhaust port 216. .

By driving the first air supply fan 119, the outside air (OA) from the outside air intake port 208 and / or the return air (RA) from the indoor side return air port 214 is supplied to the first heat medium. Cooling or warm air can be supplied to the air-conditioned space (for example, the interior zone) as the first air supply (SA1) via the first air supply path 218 by being air-conditioned by the air heat exchanger 116. . Similarly, by driving the second air supply fan 135, the outside air (OA) from the outside air intake 208 and / or the return air (RA) from the indoor side return air port 214 is supplied to the second heat medium-air. Air conditioning is performed by the heat exchanger 134, and cold air or hot air is supplied to the second air supply path 220.
Can be supplied to the air-conditioned space (for example, the perimeter zone) as the second air supply (SA2) via. Further, by driving the exhaust fan 121, the outside air (OA) from the outside air intake port 208 and / or the return air (RA) from the indoor side return air port 214 is transferred to the gas-liquid direct contact heat exchanger 1.
20 through which heat is exchanged with heat source water and exhaust (EA)
As a result, the air can be exhausted to the outside from the exhaust path 222.

A damper 224 is installed in the air path for blowing the outside air (OA) to the gas-liquid direct contact heat exchanger 120. By closing the damper 224, the outside air (OA) from the outside can be shut off and only the return air (RA) from the inside can be used as the heat source of the gas-liquid direct contact heat exchanger 120. Further, dampers 218a, 220a, 222a are provided in the first air supply path 218, the second air supply path 220, and the exhaust path 222, respectively, and further, the first air supply path 218 and the second air supply path 22
0 is communicated with the first communication passage 224 in which the damper 224a is interposed, and the first air supply passage 218 and the exhaust passage 222 are connected.
And are communicated with each other through a second communication passage 226 in which a damper 226a is interposed. Therefore, by opening / closing each damper, the first air supply path 218 can be selectively communicated with the second air supply path 220 and / or the exhaust path 222.

By adopting such a configuration of the air passage, according to the present embodiment, the following operation becomes possible. During the hot water heat storage operation, by closing the duct 218a and opening the duct 226a, it is possible to exhaust the exhaust heat (cold heat) of the first heat medium-air heat exchanger 116 to the outside through the exhaust path 222. Becomes Further, according to the present embodiment, the first air supply path 218 and the second air supply path 220.
In the case where the types of heat load (cooling / heating) required in the above are the same and there is no heat that can be taken out from the heat storage tank 112, the damper 220a is closed and the damper 218a is closed.
By opening the damper 224a, a part of the conditioned air passing through the first air supply path 218 can be blown to the second air supply path 220, and the conditioned air of the same heat load type can be supplied to the first and the second air supply paths 220. It can be supplied to the air-conditioned space from the second air supply paths 218 and 220.

The table shown in FIG. 5 shows the relationship among the heat storage state in the heat storage tank 112, the air conditioning mode, the operation mode of the heat source unit, and the open / close state of each damper when the present embodiment is operated. The operation of each operation mode will be described below.

(A) During cold heat storage, the first heat pump circuit 102 is driven in the cold heat storage operation mode. In the cold heat storage operation mode, since it is necessary to drive the gas-liquid direct contact heat exchanger 120 to discharge heat, the damper 222a is opened and the damper 226a is closed.

(B) In the hot water heat storage operation mode, it is necessary to drive the first heat medium-air heat exchanger 116 to perform exhaust heat (cold heat), so the exhaust air is sent to the exhaust path 222. So that the damper 218a is closed and the damper 22
Open 6a. Further, the heat storage tank water-air heat exchanger 244
Is not driven, the damper 222a is closed.

(C1) When cold heat is stored in the heat storage tank 112 and a cooling load is required for both the first and second air supply paths 218 and 220, the first and second
Both heat pump circuits 102 and 104 are driven in the cooling operation mode to supply cold air from the first air supply path 218 and also supply cold air from the second air supply path 220. Therefore, the dampers 218a and 220a are opened to enable each air supply path, and the dampers 224a and 226 are also activated.
The communication path is invalidated by closing a. Since the gas-liquid direct contact heat exchanger 120 needs to be driven during the cooling operation, the damper 222a is opened.

(C2) Even when the heat is stored in the heat storage tank 112 and the cooling load is required in both the first and second air supply paths 218 and 220, the first and second
Both heat pump circuits 102 and 104 are driven in the cooling operation mode to supply cold air from the first air supply path 218 and also supply cold air from the second air supply path 220. Therefore, the dampers 218a and 220a are opened to enable each air supply path, and the dampers 224a and 226 are also activated.
The communication path is invalidated by closing a. Since the gas-liquid direct contact heat exchanger 120 needs to be driven during the cooling operation, the damper 222a is opened.

(C3) First and second air supply paths 21
If the cooling load is required for both 8 and 220 and the temperature of the hot water in the heat storage tank 112 reaches the upper limit, the second
The heat pump circuit 104 is stopped, only the first heat pump circuit 102 is operated, and only the first heat medium-water heat exchanger 108 is used as a heat source without supercooling by the heat storage tank 112. In that case, the damper 224a is opened, and a part of the cold air supplied through the first air supply path 218 is also sent to the second air supply path 220, so that the first and second air supply It is possible to meet the cooling load required on both the paths 218 and 220.

(D1) When cold heat is stored in the heat storage tank 112 and heating load is required for both the first and second air supply paths 218, 220, the first and second
Both heat pump circuits 102 and 104 are driven in the heating operation mode to supply hot air from the first air supply path 218 and also supply hot air from the second air supply path 220. Therefore, the dampers 218a and 220a are opened to enable each air supply path, and the dampers 224a and 226 are also activated.
The communication path is invalidated by closing a. During the heating operation, the gas-liquid direct contact heat exchanger 120 is not driven, so the damper 222a is not controlled.

(D2) When heat is stored in the heat storage tank 112 and a heating load is required for both the first and second air supply paths 218 and 220, similarly, the first and second Both the two heat pump circuits 102 and 104 are driven in the heating operation mode to supply hot air from the first air supply path 218 and also supply hot air from the second air supply path 220. Therefore, the dampers 218a and 220a are opened to enable each air supply path, and the dampers 224a and 224a and
226a is closed to invalidate each communication path. During the heating operation, the gas-liquid direct contact heat exchanger 120 is not driven, so the damper 222a is not controlled.

(E1) If cold heat is stored in the heat storage tank 112 and a cooling load is required in the first air supply path 218 and a heating load is required in the second air supply path 220, The first heat pump circuit 102 is driven in the cooling operation mode and the second heat pump circuit 104 is driven in the heating operation mode to supply the cool air from the first air supply path 218 and the second air supply path 220. To supply warm air. Therefore, the dampers 218a and 220a are opened to enable each air supply path, and the dampers 224a and 224a and
226a is closed to invalidate each communication path. The damper 222a is opened because it is necessary to drive the gas-liquid direct contact heat exchanger 120 in order to exhaust heat from the first heat pump circuit.

(E2) When hot heat is stored in the heat storage tank 112 and a cooling load is required in the first air supply path 218 and a heating load is required in the second air supply path 220, the same is true. First, the first heat pump circuit 102 is driven in the cooling operation mode, and the second heat pump circuit 10 is driven.
4 in the heating operation mode to drive the first air supply path 218
The cool air is supplied from the second air supply path 220 and the hot air is supplied from the second air supply path 220. Therefore, the dampers 218a and 220a
Open to enable each air supply route, and to use the damper 2
24a and 226a are closed to invalidate each communication path.
The damper 222a is opened because it is necessary to drive the gas-liquid direct contact heat exchanger 120 in order to exhaust heat from the first heat pump circuit.

Although one embodiment relating to the operation of the air conditioning system according to the present embodiment has been described above, the present air conditioning system is not limited to the above operation mode, and various operation modes (for example, the second operation mode) are possible within the range of the above configuration. The heat pump circuit corresponds to the cooling load and the first heat pump circuit corresponds to the heating load). Further, if the heat storage tank water circuit is adopted as in the embodiment shown in FIG. 3, the heat storage in the heat storage tank 112 can be recovered, and the operation can be performed in various modes.

FIG. 6 shows a schematic configuration of an air conditioning system 300 according to the third embodiment of the present invention. In this air conditioning system 300, the first heat pump circuit 310 and the second heat pump circuit 320 have the same configuration. The configurations of the first and second heat pump circuits are substantially the same as the first heat pump circuit 100 of the air conditioning system 100 according to the first embodiment of the present invention shown in FIG. 1, and therefore have the same functional configuration. The same reference numerals are given to the members, and the duplicate description will be omitted. However, in order to distinguish the first and second heat pump circuits 310 and 320 from each other, a member related to the first heat pump circuit 310 is attached with a subscript “a”, and a member related to the second heat pump circuit 320 is attached. The subscript “b” is attached to the member.

The operation mode of the air-conditioning system 300 according to this embodiment is the same as the operation mode already described, and the duplicated description will be omitted here. In the case of the previous embodiment, the operating capacity of the second heat pump circuit is not connected to the gas-liquid direct contact heat exchanger 120, so
However, the second heat pump circuit had to be used exclusively as a sub-circuit. However, in the case of the present embodiment, the operating capacities of the first and second heat pump circuits 310 and 320 are equivalent, so the device configuration has high redundancy. Therefore, the degree of freedom in driving is increased, and therefore, even if a failure or the like occurs in any of the circuits, it can be dealt with by the single lung operation. Also in the case of the present embodiment, a booster circuit can be added as in the second embodiment described with reference to FIG. 3 to further increase the degree of freedom in operation.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the description of the embodiments. It is understood that various changes and modifications can be made by those skilled in the art within the scope of the technical idea described in the claims, and these also belong to the technical scope of the present invention. .

[0060]

As described above, according to the first aspect of the present invention.
According to this, it is possible to perform air heating and air cooling by the first heat medium-air heat exchanger of the first heat pump circuit, and flexibly respond to the cooling load and heating load required in each air-conditioned space. At the same time, it is possible to obtain a self-contained heat source unit that can store excess heat or waste heat as hot water, ice, or cold water in a heat storage tank. at the same time,
The second heat pump circuit can perform cooling or heating operation independently of the first heat pump circuit by using the water in the heat storage tank as a heat source, and can cope with various heat load modes of the air-conditioned space. As a result, the heat storage tank can be used as a thermal buffer tank, and heat recovery (temporal recovery) when the heat load type (cooling / heating) changes over time, and the first air supply system and the second air supply system Heat recovery (spatial heat recovery) is possible when the heat load type of the air supply system is different.

According to the second aspect, since the first and second heat pump circuits have the same configuration, the degree of freedom in operation is increased and a redundant circuit can be constructed. Therefore, even if a failure occurs in any of the circuits, it can be dealt with by the single lung operation.

According to the third aspect, the heat storage tank water circuit can be used as a thermal booster to cope with a start-up or a large air-conditioning load.

According to the fourth aspect, since only the exhaust air introduced into the air-conditioned space for controlling the air quality and having an amount equal to or less than the outside air amount can be used as the heat source or the heat carrier of the heat source unit, the outside air processing air conditioner. It is possible to construct an air-heat-source type air conditioning system that does not require a heat source that is completely distributed and that can omit a separate device such as.

According to the sixth or seventh aspect, the heat source of the heat source unit is switched and optimized in accordance with the heat load state and the heat storage state or the heat load state, so that the heat source unit is more efficient and energy saving. Can drive.

According to the eighth aspect, heat is supplied from the first air supply path by the heat storage tank water-air heat exchanger using the heat storage tank water in the heat storage tank as a heat source and the heat medium-air heat exchanger. The conditioned air having a temperature level different from that of the conditioned air can be supplied from the second air supply path, and the cooling / heating simultaneous operation and the heat recovery operation can be performed.

According to the ninth aspect, it is possible to provide an air conditioning system capable of flexibly responding to different air conditioning loads in the first area and the second area in the air conditioned space.

According to the tenth aspect, for example, the heat load types (cooling / heating) of the first air supply path and the second air supply path are the same, and the heat source type (cold water / hot water) of the heat storage tank and its When the type of heat source required in the second air supply path for recovering heat from the heat storage tank is different, or when the heat storage is exhausted, the air supply in the second air supply path is supplied to the first air supply path. ,
Can be air-conditioned.

According to the eleventh aspect, the air conditioning system configured as described above has a predetermined air conditioning space (for example, about 100
Since it is installed in a self-contained manner for each pillar interval of about square meters, it is possible to construct an individual distributed air conditioning system that can be easily constructed and managed.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a schematic configuration of a heat source unit according to a first embodiment of the present invention.

FIG. 2 is a chart showing an operation of the heat source unit according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram showing a schematic configuration of a heat source unit according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram showing a schematic configuration of an air conditioning system according to a third embodiment of the present invention.

FIG. 5 is a table showing the operation of the air conditioning system according to the third embodiment of the present invention.

FIG. 6 is a configuration diagram showing a schematic configuration of an air conditioning system according to a fourth embodiment of the present invention.

[Explanation of symbols]

100 heat source unit 102 first heat pump circuit 104 Second heat pump circuit 106 first compressor 108 First heat medium-water heat exchanger 110 First switching valve (four-way valve) 112 heat storage tank 114 First Heat Medium-Heat Storage Tank Water Heat Exchanger 116 First heat medium-air heat exchanger 118 First expansion valve 119 First air supply fan 120 Gas-liquid direct contact heat exchanger 121 Exhaust fan 122 Circulation pump 130 Second compressor 132 Second switching valve (four-way valve) 133 second heat medium-heat storage tank water heat exchanger 134 Second heat medium-air heat exchanger 135 Second air supply fan 136 Second expansion valve

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Enomoto 3-9-12 Kameino, Fujisawa City, Kanagawa Maple Town Rokukai 103 (56) Reference JP-A-8-75291 (JP, A) JP-A-52 -16836 (JP, A) JP 48-6555 (JP, A) JP 6-317338 (JP, A) JP 3-164629 (JP, A) JP 60-64145 (JP, A) ) Actual Kai 2-13950 (JP, U) Actual SHO 51-102257 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24F 3/00 F25B 5/00 F25B 27 / 02

Claims (11)

(57) [Claims] 1. A heat source unit comprising first and second heat pump circuits that can be driven independently of each other, wherein the first heat pump circuit comprises a first compressor and a first heat medium-water heat source. A first switching valve for switching the circulation direction of the exchanger and the heat medium, a first heat medium-heat storage tank water heat exchanger and a first heat medium-air heat exchanger, and a first heat medium installed in the heat storage tank. A first heat medium circulation system communicating with the expansion valve; and a first heat source water circulation system communicating with the first heat medium-water heat exchanger and the gas-liquid direct contact heat exchanger, The second heat pump circuit includes a second compressor, a second switching valve that switches the circulation direction of the heat medium, a second heat medium-heat storage tank water heat exchanger and a second heat installed in the heat storage tank. Medium
A heat source unit comprising: an air heat exchanger and a second heat medium circulation system that communicates with the second expansion valve. 2. A heat source unit comprising first and second heat pump circuits that can be driven independently of each other, wherein the first heat pump circuit comprises a first compressor and a first heat medium-hydrothermal heat. A first switching valve for switching the circulation direction of the exchanger and the heat medium, a first heat medium-heat storage tank water heat exchanger and a first heat medium-air heat exchanger, and a first heat medium installed in the heat storage tank. A first heat medium circulating system communicating with the expansion valve; and a first heat source water circulating system in which the first heat medium-water heat exchanger and the gas-liquid direct contact heat exchanger are interposed, The second heat pump circuit includes a second compressor, a second heat medium-water heat exchanger, a second switching valve for switching the circulation direction of the heat medium, and a second heat installed in the heat storage tank. A second heat medium circulating system in which a medium-heat storage tank water heat exchanger, a second heat medium-air heat exchanger, and a second expansion valve are interposed, and the second heat medium.
A second heat source water circulation system in which the water heat exchanger and the gas-liquid direct contact heat exchanger are interposed.
Heat source unit. 3. The heat storage tank water circuit comprising a heat storage tank water circulation system which connects the heat storage tank and the heat storage tank water-air heat exchanger, the heat storage tank water circuit further comprising: Heat source unit. 4. The heat source unit according to claim 1, wherein the gas-liquid direct heat exchanger uses at least indoor exhaust air as a heat source. 5. The method of operating a heat source unit according to claim 1, wherein the heat load state required in the air-conditioned space and the heat storage state of the heat storage tank are both or in accordance with the heat load state. The heat source of the first heat medium circulation system is switched to either one or both of the heat source water flowing through the first heat medium-water heat exchanger and the heat storage tank water in the heat storage tank.
How to operate the heat source unit. 6. The method of operating a heat source unit according to claim 2, wherein the heat load state required in the air-conditioned space and the heat storage state of the heat storage tank are both or in accordance with the heat load state. The heat source of the first heat medium circulation system is switched to either one or both of the heat source water flowing through the first heat medium-water heat exchanger and the heat storage tank water in the heat storage tank, and the second
The heat source of the heat medium circulation system is switched to either one or both of the heat source water flowing through the second heat medium-water heat exchanger and the heat storage tank water in the heat storage tank. How to operate the unit. 7. The heat source unit according to claim 1, an outside air intake port, an indoor side air supply port, an indoor side return air port, and an outdoor side exhaust port, wherein the outside air intake port is An indoor air supply port, and an indoor air supply port configured to selectively communicate the indoor air return port with the outdoor air exhaust port and / or the indoor air supply port; The outside air is taken in through the inlet and is supplied to the air-conditioned space as the air-conditioned air, and the exhaust gas having an intake amount equal to or less than the outside air is taken into the heat source unit through the indoor side return air port into the heat source unit. An air conditioning system characterized in that only exhaust gas is used as a heat source capable of recovering heat by the gas-liquid direct contact heat exchanger and / or an exhaust heat destination capable of exhausting heat. 8. An air supply path communicating with the indoor side air supply opening is composed of a first air supply path and a second air supply path, and the heat medium-air heat exchanger of the heat source unit is connected to the air supply path. First
7. The heat storage tank water-air heat exchanger that uses the heat storage tank water of the heat storage tank as a heat source is installed in the second air supply system path. Air conditioning system described in. 9. The air supply through the first air supply path is supplied to a first area in the air-conditioned space, and the air supply through the second air supply path is supplied to a second area in the air-conditioned space. The air conditioning system according to claim 8, wherein the air conditioning system is configured as described above. 10. A switch means for selectively blowing the air in the first air supply path to the second air supply path and / or the outdoor side exhaust port, is provided. The air conditioning system according to claim 8. 11. The air-conditioned space is divided into one or more air-conditioning units having a predetermined volume, and the air-conditioning system is installed for each of the air-conditioning units.
The air conditioning system according to any one of 1 to 11.