JPH0914696A - Heat source unit, operating method thereof and air-conditioning system utilizing the heat source unit - Google Patents

Abstract

PURPOSE: To utilize exhaust air as a heat source, to dispense with connection of an outdoor air heat source or other heat sources and to improve energy-saving properties by recovery of exhaust heat, by forming two heat pump circuits which can be driven independently respectively. CONSTITUTION: A heat source unit comprises a compressor 102, a water heat exchanger 104, a four-way valve 106 switching over the direction of circulation of a heating medium, a heat storage tank 110 equipped with a heat storage tank water heat exchanger 108 such as a coil through which the heating medium flows, an air heat exchanger 112 and an expansion valve 114. The water heat exchanger 104 is disposed on the discharge side of the compressor 102 and the expansion valve 114 is disposed between one end of the heat storage tank water heat exchanger 108 and one end of the heating medium air heat exchanger 112. The high pressure side of the four-way valve 106 and a heating medium outlet of the water heat exchanger 104, the low pressure side of the four-way valve 106 and an intake port of the compressor 102, a first connection port of the four-way valve and the other end of the heat storage tank water heat exchange 108, and a second connection port of the four-way valve and the other end of the air heat exchanger 112, are connected with each other through a heating medium circulation system respectively, so that a heat pump circuit be formed.

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, 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 thereto 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. The heat source unit according to claim 1 is a compressor, a heat medium-water heat exchanger, a switching valve such as a four-way valve for switching the circulation direction of the heat medium, and a heat medium-heat storage tank water heat exchanger such as a heat storage tank coil. And a heat medium-air heat exchanger, and an expansion valve. Further, the heat medium-water heat exchanger is disposed on the discharge side of the compressor, and the heat medium-heat tank water heat exchanger. An expansion valve between one end of the heat medium and one end of the heat transfer air heat exchanger,
High pressure side of switching valve and heat medium outlet of heat medium-water heat exchanger, low pressure side of switching valve and suction port of compressor, first connection port of switching valve and heat medium-other end of heat storage tank water heat exchanger , And the second connection port of the switching valve and the other end of the heat medium-air heat exchanger, respectively.

The heat source unit of claim 2 includes a compressor, a heat medium-water heat exchanger, a switching valve such as a four-way valve for switching the circulation direction of the heat medium, and a heat medium-heat storage tank water heat exchanger. A heat storage tank provided, a heat medium-air heat exchanger, first and second expansion valves, and a heat medium-water heat exchanger arranged on the discharge side of the compressor. A first expansion valve is arranged between one end of the heat storage tank water heat exchanger and one end of the heat medium air heat exchanger, and a detour circuit is provided to bypass the heat medium-heat storage tank water heat exchanger. A second expansion valve is disposed therein, and the high pressure side of the switching valve and the heat medium outlet of the heat medium-water heat exchanger, the low pressure side of the switching valve and the suction port of the compressor, the first connection port of the switching valve and the heat medium. -The other end of the heat storage tank water heat exchanger, the second connection port of the switching valve and the other end of the heat medium-air heat exchanger are respectively connected.

In the heat source unit, as described in claim 3, a heat source capable of recovering heat from the heat storage tank water in the heat storage tank by the heat source unit and / or an exhaust heat destination capable of discharging excess heat of the heat source unit. It is preferable to configure as follows.

Further, in the heat source unit, as described in claim 4, the heat medium-water heat exchanger performs heat exchange between the heat source water capable of exchanging heat with the heat medium and the exhaust air and / or the outside air. The gas-liquid direct contact heat exchanger is preferably configured to be connected via a heat source water circulation system. Further, as described in claim 5, a heat storage tank water circulation system for selectively circulating the heat storage tank water in the heat storage tank to the gas-liquid direct contact heat exchanger can be provided.

According to a second aspect of the present invention, there is provided a method of operating the heat source unit. According to claim 6, the heat source unit changes the heat source of the heat source unit to the heat medium-water heat exchange according to both the heat load state and the heat storage state of the heat storage tank required in the air-conditioned space, or the heat load state. It is operated so as to switch to either or both of the heat source water passing through the vessel 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 is the indoor side air supply port. And an air supply system passage formed by selectively communicating the indoor side return air port with the outdoor side exhaust port and / or the indoor side air supply port, and supplying the outside air through the outside air intake port. It is taken in and supplied to the air-conditioned space as air-conditioned air, and the exhaust less than the intake outside air amount is taken into the heat source unit from the air-conditioned space through the indoor side return air port, and only the exhaust from the air-conditioned space is directly contacted with the gas-liquid heat exchanger. Is configured as a heat source capable of recovering heat and / or an exhaust heat destination capable of exhausting heat.

In the above air conditioning system, as described in claim 8, the first air supply path communicating with the indoor air supply port is provided.
Storage tank configured by the air supply path and the second air supply path, the heat medium-air heat exchanger of the heat source unit is interposed in the first air supply path, and the heat storage tank water of the heat storage tank is used as the heat source. It is preferable that the water-air heat exchanger is arranged in the second air supply passage.

Further, in the above air conditioning system, 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. It is preferable to be configured to supply to the second area in the air-conditioned space.

Further, in the air conditioning system, as described in claim 10, a duct or the like for selectively blowing the air in the first air supply path to the second air supply path and / or the outdoor exhaust port. It is preferable to provide the switching means.

[0016]

According to the present invention, by switching the circulation direction of the condensation heat medium by the compressor, it becomes possible to perform air heating or air cooling by the heat medium-air heat exchanger.
It is possible to obtain a self-contained heat source unit capable of flexibly responding to the cooling load and the heating load required in each air-conditioned space. By storing the exhaust heat in the heat storage tank installed in the unit during air conditioning, it is not necessary to separately provide a heat source such as the outdoor unit of the package type air conditioner.

According to the second aspect, in addition to the operation mode similar to the first aspect, a cooling operation is performed in which the condensing heat medium bypasses the heat medium-heat accumulator water heat exchanger of the heat accumulator and does not perform supercooling. It becomes possible.

According to the third aspect of the present invention, the water in the heat storage tank is used as a heat source for supercooling the heat medium (during cooling operation) or as a heat source for cooling and heating the heat medium-air heat exchanger. A self-contained heat source unit that does not require can be obtained. Further, since excess heat can be recovered in the heat storage tank, it is possible to perform energy saving operation such as cold heat storage or hot water heat storage using low-cost electricity at night, and heat recovery during the daytime when the air conditioning load is high. .

According to the present invention, the heat source water supplied to the heat medium-water heat exchanger can be heated and cooled by the exhaust air and / or the outside air, and the exhaust heat of the indoor air or the heat source can be used as the heat source. Since the heat of the outside air to be taken in is used, the piping connection only requires makeup water piping to the gas-liquid direct contact heat exchanger. In that case, when only the exhaust air is used as the heat source, it is possible to obtain a heat source unit that apparently does not require a heat source. Even when the outside air is used as the heat source, it is possible to operate with a much smaller amount of outside air (for example, about 1/10) as compared with the conventional air heat source type heat source unit.

According to the fifth aspect, for example, when the temperature of the heat storage tank water in the heat storage tank rises during the cooling operation, the heat storage tank water circulation system is operated and the gas-liquid direct contact heat exchanger is used as a cooling tower. be able to. As described above, according to the present invention, it is possible to configure a self-contained heat source unit that can cover the cooling and heating load with one unit. Further, it is possible to configure a heat source unit capable of selecting an appropriate operating state depending on the heat load state of the building and the water temperature of the heat source water / heat storage tank water.

According to the sixth aspect, the heat source of the heat source unit is switched and optimized depending on the heat load state and the heat storage state or the heat load state, so that the heat source unit can be operated more efficiently and energy saving. You can Also, the heat storage tank can be used as a thermal buffer.

According to the seventh aspect, since only the exhaust gas introduced into the air-conditioned space for controlling the air quality is 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 air conditioner for outside air treatment. 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 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 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.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a heat source unit constructed according to the present invention, an operating method thereof and an air conditioning system using the heat source unit will be described below in detail with reference to the accompanying drawings. The heat source unit and the air-conditioning system according to the present invention divide an air-conditioned space of a building or the like into predetermined air-conditioning units (for example, column intervals of about 100 meters), and are installed for each air-conditioning unit. It is possible to construct a flexible individual air conditioning system that does not require a heat source for each air conditioning space.

[First Embodiment] FIG. 1 shows a schematic configuration of a heat source unit 100 according to a first embodiment of the present invention. This heat source unit 100 includes a compressor 102, a heat medium-water heat exchanger 104, a four-way valve (switching valve) 106 that switches the circulation direction of the heat medium, and a heat medium such as a coil through which the heat medium flows in a pipe-heat storage. Heat storage tank 1 equipped with tank water heat exchanger 108
10, a heat medium-air heat exchanger 112, and an expansion valve (first expansion valve) 114. Further, the heat medium-water heat exchanger 104 is arranged on the discharge side of the compressor 102, and the expansion valve 114 is provided between one end of the heat medium-heat storage tank water heat exchanger 108 and one end of the heat medium air heat exchanger 112. The high-pressure side of the four-way valve 106 and the heat medium-the heat medium outlet of the water heat exchanger 104, the low-pressure side of the four-way valve 106 and the suction port of the compressor 102, the first connection port of the four-way valve 106 and the heat medium- Heat storage tank water heat exchanger 10
A heat pump circuit is configured by connecting the other end of the switch 8, the second connection port of the four-way valve 106, and the other end of the heat medium-air heat exchanger 112 via a heat medium circulation system.

In the figure, 118 (118a, 118b) is a heat source water circulation system for passing the heat source water to the heat medium-water heat exchanger 104. An arbitrary water heat source can be connected to this heat source water circulation system. For example, as in the heat source unit 100 ′ shown in FIG. 2, the gas-liquid direct contact heat exchanger 12 is connected via the heat source water circulation system 122 in which the circulation pump 120 is interposed.
4 can be connected. As the gas-liquid direct contact heat exchanger 124, it is possible to use, for example, a small cooling tower specification including a filler, an eliminator, a sprinkling pipe, and a water tank, and the heat source water is sprinkled from the sprinkling pipe. At the same time, the heat source water can be cooled or heated by returning it to the heat pump circuit by bringing it into contact with exhaust air or outside air to exchange heat. Alternatively, as in the heat source unit 100 ″ ′ shown in FIG. 3, the heat source water circulation system 12 in which the circulation pump 126 is interposed.
8 can be connected. In this case, cold water, ice, or hot water stored in the heat storage tank 110 in a cold heat storage operation mode or a hot heat storage operation mode described later can be returned to the heat pump circuit as a heat source. In addition to this, according to the present embodiment, an arbitrary water heat source can be connected to the heat medium-water heat exchanger 104 and used.

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) Cooling operation mode During the cooling operation, the four-way valve 106 is switched to change the heating medium.
Compressor 102 → heat medium-water heat exchanger 104 → four-way valve 106
→ Heat medium-heat storage tank water heat exchanger 108 → expansion valve 114 → heat medium-air heat exchanger 112 → four-way valve 106 → compressor 102 in order. Then, the heat medium-water heat exchanger 104 is caused to function as a condenser, the condensed heat medium is supercooled in the heat storage tank 110, the pressure is reduced by the expansion valve 114, and the heat medium-air heat exchanger 112 is cooled by air. By using it, cold air can be supplied to the air-conditioned space.

(B) Cold heat storage operation mode When cold heat is stored in the heat storage tank 110 as cold water or ice, the four-way valve 106 is switched at night to change the heat medium from the compressor 102 to the heat medium-water heat exchange. Container 104 → four-way valve 106 →
The heat medium-air heat exchanger 112, the expansion valve 114, the heat medium-heat storage tank water heat exchanger 108, the four-way valve 106, and the compressor 102 are sequentially circulated. Then, the condensed heat medium condensed by the heat medium-water heat exchanger 104 is simply passed through the heat medium-air heat exchanger 112 by stopping an air supply fan (not shown), and decompressed by the expansion valve 114. After that, it is sent to the heat storage tank 110.
In the heat storage tank 110, the heat medium-heat storage tank water heat exchanger 108
The cold heat of the heat medium is transferred to the water in the heat storage tank via the. As a result, cold heat is stored as cold water or ice in the heat storage tank.

(C) Heating operation mode During heating operation, the four-way valve 106 is switched to change the heating medium to
Compressor 102 → heat medium-water heat exchanger 104 → four-way valve 106
→ Heat medium-air heat exchanger 112 → expansion valve 114 → heat medium-heat storage tank water heat exchanger 108 → four-way valve 106 → compressor 102 in order. The heat medium pressurized by the compressor 102 is used to heat the air in the heat medium-air heat exchanger 112, and the pressure is reduced in the expansion valve 114.
It is sent to the heat storage tank 110. The decompressed heat medium is the heat storage tank 1
After cooling the water in the heat storage tank 10 (or the heat storage tank 11
After collecting the heat accumulated in 0), the compressor 10 again
Sent to 2. In this way, the hot air heated by the heat recovered from the heat storage tank 110 is heated by the heat medium-air heat exchanger 1
12 is supplied to the air-conditioned space.

(D) Hot water heat storage operation mode When hot heat is stored in the heat storage tank 110 as hot water,
By switching the four-way valve 106 at night, the heat medium is transferred to the compressor 10
2 → heat medium-water heat exchanger 104 → four-way valve 106 → heat medium-heat storage tank water heat exchanger 108 → expansion valve 114 → heat medium-air heat exchanger 112 → four-way valve 106 → compressor 102 in sequence. . Then, the heat medium pressurized by the compressor 102 is
After simply passing through the heat medium-water heat exchanger 104, the heat storage tank 1
Send to 10. Heat medium of heat storage tank 110-heat storage tank water heat exchanger 1
After making 08 function as a condenser and heating the heat storage tank water,
The condensing heat medium is sent to the heat medium-air heat exchanger 112 via the expansion valve 114, where cold heat is discharged into the air. In this way, by causing the heat medium-heat storage tank water heat exchanger 108 to function as a condenser, warm heat can be stored in the heat storage tank 110.

[Second Embodiment] FIG. 4 shows a schematic structure of a heat source unit 130 according to a second embodiment of the present invention. In addition, in the present embodiment and the embodiments described later, FIG.
Constituent members having the same configurations and functions as those of the first embodiment shown in FIG. 3 are designated by the same reference numerals, and duplicate description will be omitted.

The heat source unit 130 according to the second embodiment
The basic configuration and function of are similar to those of the heat source unit 100 according to the first embodiment shown in FIG. However, in the case of the present embodiment, the other end of the heat medium-heat storage tank water heat exchange 108 (connection side of the four-way valve 106) and one end of the heat medium-air heat exchanger 112 (connection side of the expansion valve 114). A bypass path 132 that bypasses the heat medium-heat storage tank water heat exchanger 108 is provided between the two, and a second expansion valve 134 is provided in this bypass path.

Therefore, in the case of the present embodiment, the first expansion valve 114 is fully closed and the second expansion valve 134 is used to control the flow rate of the heat medium so that the condensed heat medium is the heat medium of the heat storage tank 110. By operating so as to bypass the heat storage tank heat exchanger 108, it is possible to operate the heat source unit 100 according to the first embodiment in the following operation modes in addition to the operation modes (a) to (d). .

(E) Cooling (without refrigerant supercooling) operation mode In this cooling (without refrigerant supercooling) operation mode, the heating medium is
Compressor 102 → heat medium-water heat exchanger 104 → four-way valve 106
-> Detour 132-> 2nd expansion valve 134-> Heat medium-air heat exchanger 112 is sequentially circulated. Then, unlike (a) the cooling operation mode, the condensed heat medium that has exited the heat medium-water heat exchanger 104 functioning as a condenser is bypassed to the heat storage tank 110 and sent to the second expansion valve 134, Therefore, the air can be cooled by the heat medium-air heat exchange 112 using the heat medium whose pressure has been reduced. Therefore, in the case of the present embodiment, since the condensing heat medium is not supercooled, efficient operation can be performed when the cooling load weaker than that in (a) the cooling operation mode is dealt with.

[Third Embodiment] FIG. 5 shows a schematic configuration of an air conditioning system 200 according to a third embodiment of the present invention. This air conditioning system 200 incorporates the heat source unit 100 according to the first embodiment, and is mainly composed of a heat source unit section 202 and an air conditioning section 204. The basic configuration and operation of the heat source unit section 202 have already been described with reference to FIG. 1, so redundant description will be omitted.
However, in the case of the present embodiment, the heat medium-water heat exchanger 104
A gas-liquid direct contact heat exchanger 124 is connected to the heat source water circulation system 118a on the heat source water discharge side by a pipe 208 in which a circulation pump 206 is interposed. Further, the heat storage tank 110 and the gas-liquid direct contact heat exchanger 124 are connected by a pipe line 212 in which the circulation pump 210 is interposed, and the heat storage tank water in the heat storage tank 110 is transferred to the gas-liquid direct contact heat exchanger 124. Water can be sent. Return path 214 from gas-liquid direct contact heat exchanger 214
Is branched into two passages, one of which is connected to the heat source water inlet of the heat medium-water heat exchanger 104 via a pipe 118b in which a valve 216 is inserted, and the other of which is a pipe in which a valve 218 is inserted. 22
0 to the heat storage tank 110. A strainer 222 is interposed in the return path 214, and foreign matter contained in the circulating heat source water can be filtered. Although not shown, the heat source water circulation system 118 may be provided with a makeup water supply system so as to appropriately supplement the heat source water deficient due to evaporation or the like.

The air conditioning unit 204 has a casing 224,
Air path, heat medium-air heat exchanger 112, air supply fan (first air supply fan) 226, gas-liquid direct contact heat exchanger 1
24 and an exhaust fan 228 are housed. The air path includes an outside air intake port 230, an indoor air supply port (first indoor air supply port) 232, an indoor air return port 234, and an outdoor air exhaust port 236. Then, by driving the air supply fan 226, the outside air (OA) from the outside air intake 230 and / or the return air (RA) from the indoor side return air port 234 is transferred to the heat medium-air heat exchanger 11.
Air-conditioning by 2 to supply cold air or warm air to the indoor side return air port 2
The air can be supplied to the air-conditioned space as air supply (SA) (first air supply (SA1)) from 32. Further, by driving the exhaust fan 236, the outside air (OA) from the outside air intake 230 and / or the return air (RA) from the indoor side return air port 234 passes through the gas-liquid direct contact heat exchanger 124, By exchanging heat with the heat source water, it can be exhausted to the outside from the outdoor exhaust port 236 as exhaust air (EA). In addition,
A damper 238 is installed in the air path for blowing the outside air (OA) to the gas-liquid direct contact heat exchanger 124, and by closing the damper 238, the outside air (O
A) can be shut off and only the return air (RA) from the room can be used as the heat source of the gas-liquid direct contact heat exchanger 124.

Next, the air conditioning system 2 configured as described above
The operation of 00 will be described with reference to FIG. This air conditioning system 200 has (a) a cooling operation mode,
It is possible to operate in each of the (b) cold heat storage operation mode, (c) hot water heat storage operation mode, and (d) heating operation mode. In FIG. 6, the operation state of each component in each operation mode is shown. It is shown. As shown in the figure, these operation modes correspond to the operation modes of the heat source unit 100 according to the first embodiment of the present invention described with reference to FIG. 1, and the heat source unit section 202 is the same as the heat source unit 100. Since the same operation can be performed, duplicate description will be omitted.

(A) Cooling operation mode The operation of the heat pump circuit is as described above. Regarding the air path, both the air supply fan 226 and the exhaust fan 228 are driven during the cooling operation. Thereby, the outside air (OA) and the return air (RA) can be cooled by the heat medium-air heat exchanger 112, and cold air can be supplied to the air-conditioned space. The exhaust heat is generated by the heat medium-water heat exchanger (condenser) 104 and / or the heat storage tank (supercooling heat exchanger).
Sent to the gas-liquid direct contact heat exchanger 124 via 110,
There, heat is released into the exhaust gas (EA). At that time, if the damper 238 is closed, the gas-liquid direct contact heat exchanger 124 uses only the return air (RA) from the indoor side return air port 238 as a heat source.
It can be used in, and can be operated without apparently requiring a heat source.

(B) Cold heat storage operation mode The operation of the heat pump circuit is as described above. Regarding the air path, in this cold heat storage operation mode, only the heat transfer medium-air heat exchanger 112 is allowed to pass through the condensing heat transfer medium, so the air supply fan 232 is not operated. Further, the circulation pump 206 is driven to drive the heat medium-water heat exchanger 1
Heat source water heated by 04 gas-liquid direct contact heat exchanger 1
24, and the exhaust fan 228 exhausts heat during exhaust (EA). In this operation mode, the heat storage tank 110
Since it is not necessary to discharge the heat stored inside, the circulation pump 210 is stopped, the valve 218 is closed, and the heat storage tank 110 and the gas-liquid direct contact heat exchanger 124 are separated.

(C) Heating operation mode The operation of the heat pump circuit is as described above. In this heating operation mode, the air supply fan 226 is operated, the supply air (SA) is warmed by the heat medium-air heat exchanger 112, and hot air is supplied to the air-conditioned space. In this mode, normally, heat exchange by the heat medium-water heat exchanger 104 is not performed,
Since the cold heat of the low-pressure heat medium is discharged into the heat storage tank 110, the circulation pumps 206 and 210 are stopped and the heat source water circulation system 118 is not driven. Therefore, the exhaust fan 236 is stopped, and heat exchange by the gas-liquid direct contact heat exchanger 124 is also not performed. However, when the water temperature in the heat storage tank decreases during the heating operation (when it reaches a temperature level at which heat can be exchanged by the gas-liquid direct contact heat exchanger 124), the circulation pump 210 is driven (the circulation pump 206 is Stop, valve 216 closed, valve 2
18 is open), the heat storage tank water is sent to the gas-liquid direct contact heat exchanger 124 through the pipe 212, and the gas-liquid direct contact heat exchanger 12 is supplied.
4 can be used as a heating tower.

(D) Hot water heat storage operation mode The operation of the heat pump circuit is as described above. In this hot water heat storage operation mode, heat is stored by discharging the heat of the condensation heat medium into the heat storage tank 110,
Heat exchange by the heat medium-water heat exchanger 104 is not performed, the circulation pumps 206 and 210 are stopped, and the heat source water circulation system 118 is not driven. Therefore, the exhaust fan 236 is stopped, and heat exchange by the gas-liquid direct contact heat exchanger 124 is also not performed. However, in this operation mode, since it is necessary to exhaust the cold heat to the air supply (SA) via the heat medium-air heat exchanger 112, the air supply fan 226 is driven.

In the air conditioning system according to the third embodiment of the present invention described above, the heat source unit according to the first embodiment of the present invention shown in FIG. 1 is used, but shown in FIG. 4 having a heat storage tank bypass circuit. It is also possible to apply the heat source unit according to the second embodiment of the present invention. In this case, the cooling operation mode in which the supercooling is not further performed can be performed as described above. Needless to say, the heat source unit according to the second embodiment of the present invention shown in FIG. 4 having the heat storage tank bypass can be applied to the air conditioning systems according to the fourth and fifth embodiments described below.

[Fourth Embodiment] FIG. 7 shows a schematic configuration of an air conditioning system 240 according to a fourth embodiment of the present invention. As shown in the drawing, the basic configuration and operation of the air conditioning system 240 of this embodiment are the same as those of the air conditioning system 200 according to the third embodiment of the present invention shown in FIG. . However, in the case of this embodiment, a heat storage tank water circuit 242 is further provided in addition to the air conditioning system 200 according to the third embodiment.

The heat storage tank water circuit 242 is used for the heat storage tank 110.
And heat storage tank water-air heat exchanger 2 installed in the air conditioning unit 204
A circulation pump 24 that is connected to 44 and is interposed in the middle.
6 is driven to feed the heat storage tank water in the heat storage tank 110 to the heat storage tank water-air heat exchanger 244, and the second air supply fan 248 supplies air through the second indoor air supply port 250 to the air-conditioned space. The second supply air (SA2) supplied to the can be heated or cooled. In addition, in the case of the present embodiment, the air supply path is similar to that of the third embodiment, and the first air supply fan 22 is used.
First air supply for supplying the first air supply (SA1) heated by the heat medium-air heat exchanger 112 to the air conditioning space 6 via the first indoor air supply port 232 The path and the second supply air (SA2) heated or cooled by the heat storage tank water-air heat exchanger 244 by driving the second supply air fan 248 as described in the present embodiment. It is configured by a second air supply path that supplies the air-conditioned space through the indoor air supply port 250.

Therefore, according to this embodiment, it is possible to supply the first and second supply air (SA1, SA2) having different temperature levels to the air-conditioned space from the first and second supply paths. At that time, if the first and second air supply paths are communicated with different regions (first region and second region) in the air-conditioned space, the first region and the second region are Air supply with different temperature levels (including simultaneous cooling and heating operation) can be performed. Further, the heat storage tank water-air heat exchanger 244
As a result, the heat extraction operation for pumping the hot or cold heat stored in the heat storage tank 110 can be performed.

[Fifth Embodiment] FIG. 8 shows a schematic configuration of an air conditioning system 260 according to a fifth embodiment of the present invention. As shown, the basic configuration and function of the air conditioning system 260 according to the fifth embodiment are substantially the same as those of the air conditioning system 240 according to the fourth embodiment of the present invention described with reference to FIG. A duplicate description will be omitted. However, in the case of the present embodiment, dampers 262a, 264a, 266a are provided in the first air supply path 262, the second air supply path 264, and the exhaust path 266, respectively, and the first air supply path is further provided. 262 and the second air supply path 264 are connected by the first communication path 268 in which the damper 268a is interposed, and the second air communication path 262 and the exhaust path 266 are connected in the second communication path by the damper 270a. The passages 270 communicate with each other. Therefore, by opening and closing each damper, the first
The air supply passage 262 can be selectively communicated with the second air supply passage 264 and / or the exhaust passage 266.

With this configuration, according to this embodiment, in addition to the effects of the fourth embodiment shown in FIG. 7, the air conditioning system can be operated as follows.

In the case of the previous embodiment, the heat medium-air heat exchanger 11 functioning as an evaporator in the hot water heat storage operation mode.
The exhaust heat (cold heat) of No. 2 was exhausted to the air-conditioned space via the first air supply path 262. Therefore, the time zone in which the hot water heat storage operation can be performed is limited to the nighttime when there are no personnel in the air-conditioned space. However, in the case of this embodiment, the duct 262a is
It is possible to exhaust the exhaust heat (cold heat) of the heat medium-air heat exchanger 112 to the outside by closing the duct and opening the duct 270a. Therefore, for example, regardless of whether there is a person in the air-conditioned space, It is possible to store hot water when the heating load required in the air-conditioned space is small, and to prepare for when the heating load increases. Therefore, more efficient energy saving operation can be performed.

Further, according to the present embodiment, the types of heat load (cooling / heating) required in the first air supply passage 262 and the second air supply passage 264 are the same, and the heat storage tank 11 is the same.
0 heat source type (cold water, ice / hot water) and its heat storage tank 110
When the type of heat load (cooling / heating) required in the second air supply path 264 for recovering heat from the heat storage tank is different (or when there is no heat source that can be recovered from the heat storage tank 110), the damper 264a is closed. However, by opening the damper 262a and the damper 268a, a part of the conditioned air passing through the first air supply path 262 is partially removed from the second air supply path 2
Therefore, the conditioned air having the same heat load type can be supplied to the conditioned space from the first and second air supply paths 262 and 264.

The table shown in FIG. 9 shows the relationship among the heat storage state in the heat storage tank 110, 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.

(A1) When cold heat is stored in the heat storage tank 110 and a cooling load is required for both the first and second air supply paths, the heat source unit is driven in the cooling operation mode. The cold air is supplied from the first air supply path 262, and the heat storage tank water circuit 242 is driven to supply the cold air from the second air supply path 264 as well. Therefore, the damper 262
a and 264a are opened to enable each air supply path, and the dampers 268a and 270a are closed to disable each communication path. Since it is necessary to drive the gas-liquid direct contact heat exchanger 124 during the cooling operation, the damper 266a.
Open.

(A2) When the heat is stored in the heat storage tank 110 and the cooling load is required in both the first and second air supply paths 262 and 264, the heat storage tank water circuit 2
Due to 42, cold air cannot be supplied from the second air supply path 264. Therefore, in this case, the heat source unit is driven in the cooling operation mode to supply the cool air from the first air supply path 262, and the damper 268a is opened to open the first air supply path 262 and the second air supply path 262. The communication path with the path 268 is made effective, the air cooled by the heat medium-air heat exchanger 112 is sent to the second air supply path 264, and the air-conditioned space is supplied from both the first and second air supply paths 262, 264. Supply cold air to. Also in this case, the gas-liquid direct contact heat exchanger 124
Is required to be driven, the damper 266a is opened. Further, since the heat storage tank water-air heat exchanger 244 is not used, the damper 264a is closed, and since the exhaust path 270 is not used, the damper 270a is also closed.

(B) During cold heat storage, the heat source unit 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 124 to discharge heat, the damper 266a is opened and the damper 27 is opened.
0a is closed. In this case, since air conditioning is not performed, the dampers 262a, 264a, 268a are not controlled.

(C1) Cold heat is stored in the heat storage tank 110, and the heating load and the second load are provided in the first air supply path 262.
When a cooling load is required in the air supply path of the first air supply path 2
While supplying hot air from 62, the heat storage tank water circuit 242
Is also driven to supply cold air from the second air supply path 264. Therefore, the dampers 262a and 264a are opened to enable each air supply path, and the dampers 268a and 270 are also provided.
The communication path is invalidated by closing a. In this case, since the gas-liquid direct contact heat exchanger 266a is not driven, the damper 266a is not controlled.

(C2) When the cold heat is stored in the heat storage tank 110 and the heating load is required in both the first and second air supply paths 262 and 264, the heat storage tank water circuit 2
Due to 42, hot air cannot be supplied from the second air supply path 264. Therefore, in this case, the heat source unit is driven in the heating operation mode to supply the warm air from the first air supply path 262, and the damper 268a is opened to open the first air supply path 262 and the second air supply path 262. The communication path with the air path 268 is made effective, the air heated by the heat medium-air heat exchanger 112 is sent to the second air supply path 264, and the air conditioning is performed from both the first and second air supply paths 262, 264. Supply warm air to the space. In this case, the gas-liquid direct contact heat exchanger 124
Is not driven, the damper 266a is not controlled.
Since the heat storage tank water-air heat exchanger 244 is not used,
Since the damper 264a is closed and the exhaust path 270 is not used, the damper 270a is also closed.

(C3) When the heat is stored in the heat storage tank 110 and the heating load is required for both the first and second air supply paths, the heat source unit is driven in the heating operation mode. The hot air is supplied from the first air supply path 262, and the heat source recovery circuit 242 is driven to also supply the hot air from the second air supply path 264. Therefore, the damper 262
a and 264a are opened to enable each air supply path, and the dampers 268a and 270a are closed to disable each communication path. During the heating operation, the gas-liquid direct contact heat exchanger 124 is not driven, so the damper 266a is not controlled.

(D) In the hot water heat storage operation mode, the heat medium-
Since it is necessary to drive the air heat exchanger 112 to perform exhaust heat (cold heat), the dampers 266a and 268a are closed and the dampers 262a and 270a are opened so that the exhaust air is sent to the exhaust path 266. . Further, since the heat storage tank water-air heat exchanger 244 is not driven, the damper 264a is not operated.

As described above, according to this embodiment, it is possible to flexibly cope with various air conditioning loads required in the air-conditioned space (such as temperature level and cooling / heating simultaneous load), and the heat storage operation is possible. By using it together with, it is possible to construct an efficient and energy-saving air conditioning system.

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 such embodiments. For example,
It is a design matter that can be easily accomplished by those skilled in the art that the damper is provided inside the machine instead of the duct outside the machine. In this way, within the scope of the technical idea described in the claims,
It is understood that those skilled in the art can make various changes and modifications, and these also belong to the technical scope of the present invention.

[0063]

As described above, according to the first aspect, it is possible to perform air heating or air cooling by the heat medium-air heat exchanger by switching the circulation direction of the condensation heat medium by the compressor. Therefore, it is possible to obtain a self-contained heat source unit capable of flexibly responding to the cooling load and the heating load required in each air-conditioned space. Further, by storing the exhaust heat in the heat storage tank installed in the unit during air conditioning, it is not necessary to separately provide a heat source such as the outdoor unit of the package type air conditioner.

According to the second aspect, in addition to the operation mode similar to the first aspect, the cooling operation is performed in which the condensing heat medium bypasses the heat medium-heat accumulator water heat exchanger of the heat accumulator and does not perform supercooling. It becomes possible.

According to the third aspect of the present invention, the water in the heat storage tank is used as a heat source for supercooling the heat medium (during cooling operation) or as a cold heat source for the heat medium-air heat exchanger. A self-contained heat source unit that does not require can be obtained. Further, since excess heat can be recovered in the heat storage tank, it is possible to perform energy saving operation such as cold heat storage or hot water heat storage using low-cost electricity at night, and heat recovery during the daytime when the air conditioning load is high. .

According to the fourth aspect, the heat source water supplied to the heat medium-water heat exchanger can be heated and cooled by the exhaust air and / or the outside air, thereby providing a more efficient heat source unit. it can. In that case, when only the exhaust air is used as the heat source, it is possible to obtain a heat source unit that apparently does not require a heat source. Even when the outside air is used as the heat source, the amount of outside air is much smaller than that of the conventional air heat source type heat source unit (for example,
It is possible to drive at about 1/10.

According to the fifth aspect, for example, when the water temperature of the heat storage tank water in the heat storage tank decreases during cooling operation, the heat storage tank water circulation system is operated and the gas-liquid direct contact heat exchanger is used as a cooling tower. be able to. According to the present invention described above, it is possible to configure a self-contained heat source unit that can cover the cooling and heating load with one unit. Further, it is possible to configure a heat source unit capable of selecting a suitable operation mode depending on the heat load state of the building and the water temperature of the heat source water / heat storage tank water.

According to the sixth aspect, the heat source of the heat source unit is switched and optimized depending on the heat load state and the heat storage state or the heat load state, so that the heat source unit can be operated more efficiently and energy saving. You can

According to the seventh aspect, since only the exhaust gas having a quantity equal to or less than the outside air introduced into the air-conditioned space for controlling the air quality 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 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 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 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.

[Brief description of the 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 configuration diagram showing another configuration of the heat source unit according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram showing still another configuration of the heat source unit according to the first embodiment of the present invention.

FIG. 4 is a configuration diagram showing a schematic configuration of a heat source unit according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram showing a schematic configuration of an air conditioning system according to a third embodiment of the present invention.

FIG. 6 is a chart showing an operation of the air conditioning system according to the third embodiment of the present invention.

FIG. 7 is a configuration diagram showing a schematic configuration of an air conditioning system according to a fourth embodiment of the present invention.

FIG. 8 is a configuration diagram showing a schematic configuration of an air conditioning system according to a fifth embodiment of the present invention.

FIG. 9 is a chart showing the operation of the air conditioning system according to the fifth embodiment of the present invention.

[Explanation of symbols]

 100 heat source unit 102 compressor 104 heat medium-water heat exchanger 106 switching valve (four-way valve) 108 heat medium-heat storage tank water heat exchanger 110 heat storage tank 112 heat medium-air heat exchanger 114 expansion valve 116 heat medium circulation system 118 heat source water circulation system 124 gas-liquid direct contact heat exchanger 242 heat storage recovery circuit 244 heat storage tank water-air heat exchanger OA outside air RA return air SA return air EA exhaust

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hitoshi Enomoto 3-9-12 Kameino, Fujisawa-shi, Kanagawa 103 Maple Town Rokukai 103

Claims (10)

[Claims] 1. A compressor, a heat medium-water heat exchanger, a switching valve for switching the circulation direction of the heat medium, a heat storage tank equipped with a heat medium-heat storage tank water heat exchanger, and a heat medium-air heat. In a heat source unit composed of an exchanger and an expansion valve, the heat medium-water heat exchanger is arranged on the discharge side of the compressor, and one end of the heat medium-heat storage tank water heat exchanger and the heat medium. The expansion valve is arranged between one end of the air heat exchanger, the high pressure side of the switching valve and the heat medium outlet of the heat medium-water heat exchanger, the low pressure side of the switching valve and the suction port of the compressor. Connecting the first connection port of the switching valve and the other end of the heat medium-heat storage tank water heat exchanger, and the second connection port of the switching valve and the other end of the heat medium-air heat exchanger, respectively. A heat source unit characterized by being formed. 2. A compressor, a heat transfer medium-water heat exchanger, a switching valve for switching the circulation direction of the heat transfer medium, a heat storage tank equipped with a heat transfer medium-heat storage tank water heat exchanger, and a heat transfer medium-air heat. In a heat source unit including an exchanger and first and second expansion valves, the heat medium-water heat exchanger is arranged on a discharge side of the compressor, and the heat medium-heat storage tank water heat exchanger. The first expansion valve is disposed between one end of the heat medium-air heat exchanger and one end of the heat medium-air heat exchanger, and a detour circuit that bypasses the heat medium-heat storage tank water heat exchanger is provided,
The second expansion valve is arranged in the bypass, the high pressure side of the switching valve and the heat medium outlet of the heat medium-water heat exchanger, the low pressure side of the switching valve and the suction port of the compressor, the switching. A first connection port of the valve and the other end of the heat medium-heat storage tank water heat exchanger, and a second connection port of the switching valve and the other end of the heat medium-air heat exchanger, respectively. Characteristic heat source unit. 3. The heat storage tank water in the heat storage tank is configured to be a heat source capable of recovering heat by the heat source unit and / or a surplus heat of the heat source unit serving as an exhaust heat destination capable of discharging heat. The heat source unit according to claim 1 or 2. 4. The heat medium-water heat exchanger comprises a heat source water circulation system for a gas-liquid direct contact heat exchanger for exchanging heat between heat source water capable of exchanging heat with the heat medium and exhaust air and / or outside air. The heat source unit according to claim 1, wherein the heat source unit is connected via a heat source unit. 5. The heat source unit according to claim 4, further comprising a heat storage tank water circulation system for selectively circulating heat storage tank water in the heat storage tank to the gas-liquid direct contact heat exchanger. . 6. The method for operating a heat source unit according to claim 1, wherein 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. Accordingly, the heat source of the heat source unit is switched to either or both of the heat source water for passing through the heat medium-water heat exchanger and the heat storage tank water in the heat storage tank, of the heat source unit. how to drive. 7. The heat source unit according to claim 4, an outdoor air intake port, an indoor air supply port, an indoor return air port, and an outdoor air exhaust port, wherein the outdoor air intake port is the indoor air supply port. And an air supply system passage which is communicated with the indoor side return air port and selectively communicates with the outdoor side exhaust port and / or the indoor side air supply port, and the outside air is introduced via the outside air intake port. Is supplied to the air-conditioned space as air-conditioned air, and exhaust gas having a volume equal to or less than the intake outside air is taken into the heat source unit from the air-conditioned space through the indoor-side return air port, and only exhaust gas from the air-conditioned space is taken into the air. An air conditioning system characterized by being configured as a heat source capable of recovering heat by a 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.