JP2003222423A - Refrigeration unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigeration unit capable of utilizing dispersed power supply more efficiently than a conventional case. <P>SOLUTION: An air conditioner 100 is provided with the dispersed power supply 1, a refrigerant circuit 2, and an exhaust heat circuit 3. A heat recovery heat exchanger 24 for heat-exchanging heating medium in the exhaust heat circuit 3 and refrigerant is provided in the refrigerant circuit 2. Electricity in the dispersed power supply 1 is supplied into a compressor 4 through a second electricity supply part 28. When performing heating operation, exhaust heat of the dispersed power supply 1 is utilized as a part of a heat source. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a refrigerating apparatus.

[0002]

2. Description of the Related Art Conventionally, there is a close relationship between a refrigerating machine and electric power circumstances, such as energy saving of the refrigerating machine contributing to peak cut of power demand. Therefore, regarding the use of the refrigerating apparatus, while making the efficiency of the apparatus itself high, various studies have been made on the usage form of electric power.

In recent years, due to the deregulation of the electric power business, various power source forms are spreading beyond the existing electric power business. Among them, a distributed power source that generates electricity that is constantly used in factories, business establishments, and the like in units of those factories or business establishments is one of the things that attracts particular attention.

[0004]

By the way, in order to improve the efficiency of the system using the distributed power source, in addition to the high efficiency of the distributed power source itself, the utilization efficiency of the user side device using the distributed power source is improved. Is desirable.

The present invention has been made in view of the above points, and an object of the present invention is to provide a refrigerating apparatus which can use a distributed power source more efficiently than before.

[0006]

In order to achieve the above object, the present invention uses the exhaust heat of the distributed power source to heat the refrigerant in the refrigerant circuit.

The refrigerating apparatus according to the present invention comprises a distributed power source, a compressor, a heat source side heat exchanger, a pressure reducing mechanism, a utilization side heat exchanger, and a heat recovery heat exchanger for recovering exhaust heat of the dispersed power source. And a refrigerant circuit.

As a result, the refrigerant in the refrigerant circuit is heated by the exhaust heat of the dispersed power source via the heat recovery heat exchanger. Therefore, the exhaust heat of the dispersed power source is effectively used in the refrigerant circuit, so that the utilization efficiency of the dispersed power source can be improved.

It is preferable that the refrigerating apparatus comprises an electric power supply means for supplying the electric power of the distributed power source to the compressor.

Further, at least one of the heat source side heat exchanger and the use side heat exchanger may be provided with a blower, and may be provided with an electricity supply means for supplying electricity of the dispersed power source to the blower.

As a result, both electricity and heat generated by the distributed power source are utilized in the refrigeration system. Therefore, the utilization efficiency of the distributed power source can be improved as compared with the refrigeration system that uses only the electricity or the exhaust heat of the dispersed power source.

The heat exchanger on the utilization side is an indoor heat exchanger installed in a room for exchanging heat between the refrigerant in the refrigerant circuit and the indoor air. The heat recovery heat exchanger is operated by the exhaust heat of the dispersed power source during the heating operation. It may consist of an auxiliary evaporator that evaporates the refrigerant in the refrigerant circuit.

As a result, the refrigeration system is constructed as an air conditioner for heating or cooling the indoor air. Therefore, the exhaust heat of the distributed power sources can be effectively used in the air conditioner.

Another refrigerating apparatus according to the present invention comprises a distributed power source, a primary side circuit in which a primary side refrigerant circulates, and a secondary side circuit in which a secondary side refrigerant circulates. A compressor, a main heat exchanger that heats the secondary side refrigerant by exhaust heat of the dispersed power source during heating operation, and a heating heat exchanger that condenses the primary side refrigerant and heats the secondary side refrigerant. A cooling heat exchanger that evaporates a primary side refrigerant to cool a secondary side refrigerant is provided, and the main heat exchanger and a use side heat exchanger are provided in the secondary side circuit. A side circuit, a first refrigerant storage means and a second refrigerant storage means are provided, and one refrigerant storage means is pressurized by the high pressure in the heating heat exchanger, and the other refrigerant storage is performed by the low pressure in the cooling heat exchanger. Depressurizing the means to direct the flow of refrigerant from the pressurized refrigerant storage means to the depressurized refrigerant storage means. In which a driving force generating circuit for generating the side circuit is provided.

Thus, during the heating operation, the exhaust heat of the dispersed power source and the secondary side refrigerant exchange heat via the main heat exchanger, and the secondary side refrigerant is heated by the exhaust heat of the dispersed power source. The heated secondary-side refrigerant radiates heat in the use-side heat exchanger to heat the object to be heated. Since the exhaust heat of the dispersed power source is used in this way, the utilization efficiency of the dispersed power source is improved.

Another refrigeration system according to the present invention comprises a distributed power source, a primary side circuit through which a primary side refrigerant circulates, and a secondary side circuit through which a secondary side refrigerant circulates. Include a compressor, a main heat exchanger for transmitting hot or cold heat generated in the primary side circuit to the secondary side circuit, and heating heat exchange for heating a secondary side refrigerant by exhaust heat of the dispersed power source. Bowl and 1
A cooling heat exchanger for evaporating the secondary side refrigerant to cool the secondary side refrigerant is provided, and the secondary side circuit is provided with the main heat exchanger and the utilization side heat exchanger. And a first refrigerant storage means and a second refrigerant storage means, wherein one refrigerant storage means is pressurized by the high pressure in the heating heat exchanger and the other refrigerant storage means is operated by the low pressure in the cooling heat exchanger. A driving force generation circuit for generating a refrigerant flow from the pressurized and depressurized refrigerant storage means toward the depressurized refrigerant storage means in the use side circuit is provided.

As a result, the exhaust heat of the dispersed power source and the secondary side refrigerant exchange heat through the heating heat exchanger, and the secondary side refrigerant is heated by the exhaust heat of the dispersed power source. As a result, the secondary-side refrigerant in the heating heat exchanger is in a higher pressure state than the secondary-side refrigerant in other parts of the secondary-side circuit, and this high pressure pressurizes one of the refrigerant storage means. . as a result,
In the secondary side circuit, a driving force for circulating the secondary side refrigerant is generated in the utilization side circuit, and cooling or heating is performed by heat transfer of the secondary side refrigerant in the utilization side circuit. in this way,
Since the exhaust heat of the dispersed power source is used for the driving force for transporting the secondary side refrigerant, the utilization efficiency of the dispersed electric power can be improved.

Another refrigerating apparatus according to the present invention comprises a distributed power source, a primary side circuit in which a primary side refrigerant circulates, and a secondary side circuit in which a secondary side refrigerant circulates. Include a compressor, a main heat exchanger for transmitting hot or cold heat generated in the primary side circuit to the secondary side circuit, and heating heat for condensing the primary side refrigerant to heat the secondary side refrigerant. An exchanger and a cooling heat exchanger that cools the secondary side refrigerant by evaporating the primary side refrigerant are provided, and the main side heat exchanger and the use side heat exchanger are provided in the secondary side circuit. And a first refrigerant storage means and a second refrigerant storage means, wherein one refrigerant storage means is pressurized by the high pressure in the heating heat exchanger and the other by the low pressure in the cooling heat exchanger. Depressurizing the refrigerant storage means of, and flowing the refrigerant flow from the pressurized refrigerant storage means to the depressurized refrigerant storage means. A driving force generating circuit for generating the use side circuit is provided, and a liquid pipe of the use side heat exchanger in the use side circuit of the secondary side circuit is connected to the use side heat exchange from a pressurized refrigerant storage means. A reheat heat exchanger is provided for heating the liquid refrigerant heading for the vessel by the exhaust heat of the dispersed power source.

As a result, in the utilization side circuit of the secondary side circuit, the liquid refrigerant flowing out from the pressurized refrigerant storage means is
In the liquid pipe of the utilization side heat exchanger, it is heated by the exhaust heat of the dispersed power source via the reheat heat exchanger. As a result, the temperature of this liquid refrigerant rises. Therefore, the temperature of the liquid pipe of the utilization side heat exchanger rises, and the air around the liquid pipe is less likely to condense on the surface of the liquid pipe. That is, the occurrence of dew condensation on the liquid pipe is suppressed. Therefore, the exhaust heat of the dispersed power source is used to prevent dew condensation, and the utilization efficiency of the dispersed power source is improved.

[0020]

As described above, according to the present invention, since the refrigerant in the refrigerant circuit is heated by the exhaust heat of the dispersed power source, not only the electricity of the dispersed power source but also its exhaust heat is effectively used. be able to. Therefore, the distributed power source can be used more efficiently than ever before.

If the electricity of the distributed power source is used to operate the compressor or the blower, the distributed power source can be used more effectively.

In a refrigerating apparatus having a primary side circuit and a secondary side circuit having first and second refrigerant storage means, a main heat exchanger for heating the refrigerant in the secondary side circuit by exhaust heat of a dispersed power source. , A heating heat exchanger that heats the refrigerant in the secondary circuit by the exhaust heat of the dispersed power source to generate high pressure, or reheat heat exchange that heats the refrigerant in the liquid pipe of the utilization side heat exchanger by the exhaust heat of the dispersed power source Since the equipment is provided, the distributed power source can be effectively used.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

<Embodiment 1> The refrigerating apparatus shown in FIG. 1 is an air conditioner (100) that utilizes the exhaust heat of the dispersed power source (1) as part of the heat source during heating operation. Air conditioner (10
0) includes a refrigerant circuit (2) and an exhaust heat circuit (3) for recovering exhaust heat of the distributed power source (1).

As the distributed power source (1), for example, a gas engine type distributed power source, a gas turbine type distributed power source, a fuel cell or the like can be preferably used. However, the type of the distributed power source (1) is not particularly limited.

The refrigerant circuit (2) includes a compressor (4), a four-way switching valve (5) as a flow path changing means, an outdoor heat exchanger (6) as a heat source side heat exchanger, and four Check valve (11,12,13,1
It is provided with a bridge circuit (7) formed by combining 4), an indoor expansion valve (8, 8), and an indoor heat exchanger (9, 9) as a use side heat exchanger. An outdoor blower (26) is provided for the outdoor heat exchanger (6).

The first port (lower port shown in FIG. 1) of the four-way switching valve (5) is connected to the discharge pipe of the compressor (4). The second port (the port on the right side in FIG. 1) of the four-way switching valve (5) is connected to the outdoor heat exchanger (6) via a refrigerant pipe. The third port (upper port shown in FIG. 1) of the four-way switching valve (5) is connected to the suction pipe of the compressor (4). The fourth port of the four-way switching valve (5) (the port on the left side in FIG. 1) is connected to the indoor heat exchanger (9,
9) connected to.

The bridge circuit (7) includes a first check valve (11).
Connection end (15) provided between the check valve and the fourth check valve (14)
And a connection end (16) provided between the first check valve (11) and the second check valve (12), the second check valve (12) and the third check valve (13). And a connection end (18) provided between the third check valve (13) and the fourth check valve (14).

The first check valve (11) allows the refrigerant flow from the connection end (15) to the connection end (16) while blocking the refrigerant flow from the connection end (16) to the connection end (15). To do. The second check valve (12) allows the refrigerant flow from the connection end (17) toward the connection end (16), while the connection end (1
It prevents the flow of refrigerant from 6) to the connection end (17). The third check valve (13) allows the refrigerant flow from the connection end (18) toward the connection end (17), while the connection end (17)
The flow of the refrigerant from the connection end (18) is blocked. The fourth check valve (14) is connected from the connection end (18) to the connection end (1
While permitting the refrigerant flow toward 5), the refrigerant flow from the connection end (15) toward the connection end (18) is blocked.

The connection end (15) is connected to the outdoor heat exchanger (6) via a refrigerant pipe. The connection end (17) is connected to the indoor expansion valve (8, 8) via a refrigerant pipe.
Between the connection end (16) and the connection end (18), the receiver (1
9) and a refrigerant pipe (21) having an expansion valve (20) are provided.

Indoor electric valve (8) and indoor heat exchanger (9)
Is provided in an indoor unit (not shown). A plurality of indoor units are provided, and the indoor motor-operated valve (8) and the indoor heat exchanger (9) are arranged in parallel. Each indoor unit is provided with an indoor blower (25) that supplies air to the indoor heat exchanger (9).

The refrigerant circuit (2) is further provided with an exhaust heat recovery circuit (22). The upstream end of the exhaust heat recovery circuit (22) is connected between the receiver (19) and the expansion valve (20) in the refrigerant pipe (21). The downstream end of the exhaust heat recovery circuit (22) is connected to the suction pipe of the compressor (4).
The exhaust heat recovery circuit (22) is provided with an expansion valve (23) and a heat recovery heat exchanger (24) in order from the upstream end toward the downstream end. Thus, in this embodiment, the heat recovery heat exchanger (24) is provided in parallel with the outdoor heat exchanger (6).

The exhaust heat circuit (3) is constructed as a closed circuit connecting the dispersed power source (1) and the heat recovery heat exchanger (24),
A heat medium such as water or gas heated by the exhaust heat of the distributed power source (1) circulates in the circuit.

The distributed power source (1) includes an air conditioner (100).
A first electricity supply section (27) for supplying electricity to other electric equipment other than the above, and a second electricity supply section for supplying electricity to the air conditioner (100).
An electricity supply unit (28) is provided. In the present embodiment, the second electricity supply unit (28) is configured to supply electricity from the distributed power source (1) to the compressor (4). However, the second electricity supply unit (28) may be configured to supply electricity of the dispersed power source (1) to one or both of the indoor blower (25) and the outdoor blower (26). , Compressor (4), indoor blower (25) and outdoor blower (2
It may be configured to supply electricity to all of 6).

Next, the operation of the air conditioner (100) will be described. During heating operation, the four-way switching valve (5)
The communication state shown by the broken line in FIG. 1, that is, the first port and the fourth port
The port is set to communicate with the second port and the third port is set to communicate with each other. In the heat exhaust circuit (3), the heat medium heated by the distributed power source (1) circulates.

The refrigerant discharged from the compressor (4) flows into the indoor heat exchanger (9) through the four-way switching valve (5) and exchanges heat with indoor air in the indoor heat exchanger (9, 9). To condense. The condensed refrigerant flows into the bridge circuit (7), passes through the second check valve (12) and the receiver (19), and then enters the outdoor heat exchanger (6) side and the exhaust heat recovery circuit (22). Divert.
At this time, the flow rate of the refrigerant flowing through the outdoor heat exchanger (6) and the flow rate of the refrigerant flowing through the exhaust heat recovery circuit (22) are determined by the expansion valve (20).
By adjusting the opening degree of the expansion valve (23) and the expansion valve (23), it is possible to freely adjust each.

The refrigerant flowing into the outdoor heat exchanger (6) exchanges heat with the outdoor air and evaporates. On the other hand, the refrigerant that has flowed into the heat recovery heat exchanger (24) exchanges heat with the heat medium of the exhaust heat circuit (3) and evaporates. And outdoor heat exchanger (6)
The refrigerant flowing out from the heat recovery heat exchanger (24) joins and then is sucked into the compressor (4).

By setting the expansion valve (23) to the fully closed state, the air conditioner (100) can also perform the heating operation without using the exhaust heat of the dispersed power source (1). is there.

The air conditioner (100) is also capable of cooling operation. During cooling operation, the four-way switching valve (5) is shown in Fig. 1.
Is set to the communication state shown by the solid line. Then, the refrigerant discharged from the compressor (4) is condensed in the outdoor heat exchanger (6), evaporated in the indoor heat exchanger (9, 9), and sucked into the compressor (4).

As described above, in the air conditioner (100), the exhaust heat of the dispersed power source (1) is recovered to the refrigerant in the refrigerant circuit (2) through the heat recovery heat exchanger (24) during the heating operation. Therefore, the exhaust heat of the distributed power source (1) can be effectively used. Therefore, the distributed power source (1) can be used not only as a power source but also as a heat source, so that the utilization efficiency of the distributed power source (1) can be improved.

-Modification- In the above embodiment, the heat recovery heat exchanger (24) is provided in parallel with the outdoor heat exchanger (6), but the heat recovery heat exchanger (24) is used for outdoor heat exchange. It is also possible to install in series with the device (6). For example, as shown in FIG. 2, the heat recovery heat exchanger (24) may be provided between the four-way switching valve (5) and the outdoor heat exchanger (6).

During the heating operation, the refrigerant discharged from the compressor (4) is condensed in the indoor heat exchanger (9, 9), passes through the bridge circuit (7), and then flows into the outdoor heat exchanger (6). Inflow. In the outdoor heat exchanger (6), some or all of the refrigerant evaporates. The refrigerant flowing out of the outdoor heat exchanger (6) flows into the heat recovery heat exchanger (24), is heated by the heat medium of the exhaust heat circuit (3) through the heat recovery heat exchanger (24), and is evaporated. Or overheated.

During the cooling operation, the heat medium is not circulated in the exhaust heat circuit (3). Then, the refrigerant discharged from the compressor (4) is condensed in the outdoor heat exchanger (6), evaporated in the indoor heat exchanger (9, 9), and sucked into the compressor (4).

As described above, also in this modification, the exhaust heat of the distributed power source (1) can be effectively utilized, and the utilization efficiency of the distributed power source (1) can be improved.

<Second Embodiment> -Structure of Air Conditioner (200) -As shown in FIG. 3, the air conditioner (20) according to the second embodiment.
0) includes a primary side circuit (51), a secondary side circuit (52), and a heat exhaust circuit (53). The primary side circuit (51) is a heat source side refrigerant circuit, and supplies hot or cold heat to the secondary side circuit (52). The primary side circuit (51) heats and cools the secondary side refrigerant of the secondary side circuit (52) in a first heating heat exchanger (66) and a cooling heat exchanger (69) described later, It also generates a driving force for circulating the refrigerant in the secondary circuit (52). On the other hand, the secondary side circuit (52) is a refrigerant circuit on the use side, and supplies hot or cold heat to the room via the indoor heat exchanger (83). Exhaust heat circuit (53) is a distributed power source (1)
The exhaust heat of is supplied to the refrigerant of the secondary side circuit (52).

More specifically, the primary side circuit (51) is a refrigerant circuit in which the primary side refrigerant circulates and comprises a main circuit (62), a heating circuit (60) and a cooling circuit (61). ing.

The main circuit (62) includes a compressor (54), a four-way switching valve (55), an outdoor heat exchanger (56), a receiver (63), an expansion valve (57), and a first main heat exchanger. (58) is provided. The discharge pipe of the compressor (54) is connected to the first port (the lower port shown in FIG. 3) of the four-way switching valve (55), and the compressor (54)
Is connected to the third port (upper port shown in FIG. 3) of the four-way switching valve (55). Outdoor Heat Exchanger (56)
And receiver (63), expansion valve (57) and first main heat exchanger (5
8) is arranged in order from the second port (right side port shown in FIG. 3) of the four-way switching valve (55) toward the fourth port (left side port shown in FIG. 3). An on-off valve (65) is provided between the receiver (63) and the expansion valve (57). The outdoor heat exchanger (56) is provided with an outdoor blower (64).

The heating circuit (60) is provided with a first heating heat exchanger (66) and an opening / closing valve (67). The upstream end of the heating circuit (60) is connected to the receiver (6
3) is connected between the on-off valve (65) and the heating circuit (60)
The downstream end of is connected to the main circuit (62) between the on-off valve (65) and the expansion valve (57).

The cooling circuit (61) is provided with an expansion valve (68) and a cooling heat exchanger (69). The upstream end of the cooling circuit (61) is connected between the downstream end of the heating circuit (60) in the main circuit (62) and the expansion valve (57). The downstream end of the cooling circuit (61) is connected to the suction pipe of the compressor (54). In addition, in FIG. 3, (CV) is a check valve.

Further, the primary side circuit (51) is provided with bypass circuits (70, 71). The upstream end of the bypass circuit (70) is connected between the expansion valve (57) and the first main heat exchanger (58) in the main circuit (62), and the downstream end thereof is the outdoor heat exchanger (56) and the receiver. (63) is connected to. The upstream end of the bypass circuit (71) is connected between the expansion valve (57) and the first main heat exchanger (58) in the main circuit (62), and the downstream end thereof is the outdoor heat exchanger (56) and the receiver. (63) is connected to. The upstream end and the downstream end of the bypass circuit (70) have a check valve (CV) between them, and the bypass circuit (7
It is located closer to the outdoor heat exchanger (56) than the upstream and downstream ends of 1).

The above is the configuration of the primary side circuit (51). On the other hand, the secondary side circuit (52) includes a utilization side circuit (81) and a driving force generation circuit (82).

The use side circuit (81) includes the first main heat exchanger (5
8) and an indoor heat exchanger (83) as a use side heat exchanger. The indoor heat exchanger (83) is provided with an indoor blower (64a). First main heat exchanger (58)
The upper end of the gas pipe (84) and the upper end of the indoor heat exchanger (83)
Connected through. The lower end of the first main heat exchanger (58) and the lower end of the indoor heat exchanger (83) are connected via a liquid pipe (85, 87). Liquid pipe (8) on the indoor heat exchanger (83) side
The expansion valve (86) is provided in 5). The liquid pipe (87) on the side of the first main heat exchanger (58) is the second of the four-way switching valve (88).
The liquid pipe (85) on the indoor heat exchanger (83) side is connected to the port (the port on the right side in FIG. 3) and the fourth port (the port on the left side in FIG. 3) of the four-way switching valve (88). Has been done.

Further, the utilization side circuit (81) is provided with a second main heat exchanger (89) and a reheat heat exchanger (90) for heating the secondary side refrigerant by the exhaust heat of the dispersed power source (1). Has been.
The second main heat exchanger (89) is installed in parallel with the first main heat exchanger (58). Reheat heat exchanger (90), liquid pipe (85)
Is provided between the four-way switching valve (88) and the expansion valve (86).

The driving force generating circuit (82) has a first tank (91) and a second tank (92) for storing the secondary side refrigerant, a first heating heat exchanger (66) and a second heating heat exchange. Vessel (94),
A cooling heat exchanger (69) is provided. As will be described later in detail, the driving force generation circuit (82) includes a heating heat exchanger (66,94) and a cooling heat exchanger (6) for the first and second tanks (91,92).
9) are alternately communicated with the inside of the tank (91, 92) to increase / decrease the pressure in the tank (91, 92), thereby applying a circulation driving force to the secondary side refrigerant. Further, the driving force generation circuit (82) is provided with an auxiliary tank (93) and a buffer tank (95).

A recovery liquid pipe (96) and an extrusion liquid pipe (97) are connected to the first tank (91) and the second tank (92), respectively.

The extruding liquid pipe (97) is branched at one end into three branch pipes (97a, 97b, 97c) and at the other end at the third port (upper side in FIG. 3) of the four-way switching valve (88). Port). The branch pipes (97a, 97b, 97c) are connected to the first tank (9
1), the second tank (92), and the auxiliary tank (93), respectively. Out of the branch pipes (97a, 97b, 97c), the branch pipes (97a, 97b) connected to the first tank (91) and the second tank (92) flow out of the refrigerant from the tanks (91, 92). There is a check valve (CV1) that allows only this.
The branch pipe (97c) connected to the auxiliary tank (93) is provided with a check valve (CV2) that allows only the refrigerant to flow into the auxiliary tank (93).

The recovery liquid pipe (96) has one end connected to the first port (lower port in FIG. 3) of the four-way switching valve (88) and the other end having two branch pipes (96a, 96b). ) Has branched to.
The branch pipe (96a) is connected to the first tank (91), and the branch pipe (96b) is connected to the second tank (92). Each of the branch pipes (96a, 96b) is provided with a check valve (CV3) that allows only the refrigerant to flow into the tanks (91, 92).

The heating heat exchanger (66,94) is connected to the tank (91,9).
2,93) for pressurizing. Heating heat exchanger (6
6,94) is connected to the first tank (9) via the gas supply pipe (98).
1), the second tank (92) and the auxiliary tank (93). One end of the gas supply pipe (98) is branched, one branch pipe is connected to the upper end of the first heating heat exchanger (66), and the other branch pipe is the upper end of the second heating heat exchanger (94). It is connected to the. The other end of the gas supply pipe (98) is branched into three branch pipes (98a, 98b, 98c). Branch pipe (98
a) is connected to the upper end of the first tank (91) and the branch pipe (9
8b) is connected to the upper end of the second tank (92), and the branch pipe (98c) is connected to the upper end of the auxiliary tank (93). The branch pipe (98a) is provided with a first pressurizing solenoid valve (P1), the branch pipe (98b) is provided with a second pressurizing solenoid valve (P2), and the branch pipe (98c) is provided with a third pressurizing valve. A solenoid valve (P3) is provided.

Further, the heating heat exchanger (66, 94) communicates with the auxiliary tank (93) via the liquid recovery pipe (99).
The liquid recovery pipe (99) has one end connected to the lower end of the auxiliary tank (93) and the other end connected to the lower ends of the heating heat exchangers (66, 94). The liquid recovery pipe (99) has a check valve (CV4) that allows only the outflow of the refrigerant from the auxiliary tank (93).
And a buffer tank (95) are provided in order from the auxiliary tank (93) toward the heating heat exchanger (66, 94).

In the heating heat exchanger (66, 94), the liquid recovery pipe (9
The liquid refrigerant supplied through 9) evaporates. On the other hand, the gas refrigerant in the heating heat exchanger (66,94) is supplied to the tank (91,92,93) through the gas supply pipe (98). Since the gas refrigerant in the heating heat exchanger (66,94) has a relatively high pressure, by supplying this high-pressure gas refrigerant to the tank (91,92,93), the tank (91,92,93) Will be applied.

Further, the buffer tank (95) and the heating heat exchangers (66, 94) are connected by a pressure equalizing pipe (49). This pressure equalizing pipe (49) has a buffer tank (95) at one end.
Of the heating heat exchanger (66, 94) via the gas supply pipe (98).

The cooling heat exchanger (69) is a tank (91, 92, 9
It is for decompressing 3). Cooling heat exchanger (69)
Is connected to each of the first tank (91), the second tank (92) and the auxiliary tank (93) via the gas recovery pipe (48). The gas recovery pipe (48) has three branch pipes (48a, 48b, 48c) at one end and the cooling heat exchanger (69) at the other end.
Is connected to the upper end of. The branch pipe (48a) is connected to the upper end of the first tank (91), the branch pipe (48b) is connected to the upper end of the second tank (92), and the branch pipe (48c) is connected to the auxiliary tank (93). It is connected to the upper end. Branch pipe (48
The first pressure reducing solenoid valve (V1) is installed in a) and the branch pipe (48
The second pressure reducing solenoid valve (V2) is installed in b) and the branch pipe (48
A third pressure reducing solenoid valve (V3) is provided in c).

Further, the cooling heat exchanger (69) is provided with a first tank (91) and a second tank (9) via the liquid supply pipe (47).
2) is connected with. The liquid supply pipe (47) has one end connected to the lower end of the cooling heat exchanger (69) and the other end branched into two branch pipes (47a, 47b). The branch pipe (47a) is connected to the first tank (9) via the branch pipe (98a) of the gas supply pipe (98).
1) connected to. The branch pipe (47b) is connected to the second tank (92) via the branch pipe (98b) of the gas supply pipe (98). Each of the branch pipes (47a, 47b) is provided with a check valve (CV5) that allows only the refrigerant flow toward the tanks (91, 92).

The cooling heat exchanger (69) is a gas recovery pipe (48).
The gas refrigerant is sucked from the tank (91, 92, 93) through and condensed. As a result, the tank (91, 92, 93) is depressurized. The condensed refrigerant is returned to the tanks (91, 92) through the liquid supply pipe (47).

The first tank (91) and the second tank (92) are installed at positions lower than the cooling heat exchanger (69). The auxiliary tank (93) has a heating heat exchanger (66,9
It is installed higher than 4). The buffer tank (95) is installed above the heating heat exchanger (66, 94) and below the auxiliary tank (93). The buffer tank (95) is provided for the purpose of stably supplying the liquid refrigerant to the heating heat exchangers (66, 94) during operation and startup.

The exhaust heat circuit (53) is provided with the above-mentioned second main heat exchanger (89), second heating heat exchanger (94) and reheat heat exchanger (90). In this heat exhaust circuit (53),
The heat medium heated by the exhaust heat of the distributed power source (1) circulates.

-Operational Behavior of Air Conditioner (200) -Next, operational behavior of the air conditioner (200) will be described.

(Heating operation) First, referring to FIG.
The operation during heating operation will be described.

In the exhaust heat circuit (53), the heat medium heated by the exhaust heat of the dispersed power source (1) circulates. Then, this heat medium heats the secondary side refrigerant in each of the second main heat exchanger (89) and the second heating heat exchanger (94). During the heating operation, the heat medium is not circulated in the reheat heat exchanger (90) by closing the on-off valve (not shown).

In the primary side circuit (51), the four-way switching valve (55)
Is set as shown by the broken line in FIG. In the main circuit (62), the primary side refrigerant discharged from the compressor (54) is
It condenses in the first main heat exchanger (58) and heats the secondary side refrigerant via the first main heat exchanger (58). The primary-side refrigerant flowing out of the first main heat exchanger (58) flows through the bypass circuit (71) and flows into the receiver (63). The refrigerant flowing out of the receiver (63) is expanded in the expansion valve (57) and then evaporated in the outdoor heat exchanger (56). The evaporated refrigerant is drawn into the compressor (54) through the four-way switching valve (55).

In the main circuit (62), the receiver (6
The refrigerant flowing out of 3) is split, and one of the split refrigerants flows into the heating circuit (60). The refrigerant flowing into the heating circuit (60) is condensed in the first heating heat exchanger (66) and heats the secondary side refrigerant in the first heating heat exchanger (66). And
The refrigerant flowing out of the first heating heat exchanger (66) returns to the main circuit (62) again and merges with the refrigerant flowing in the main circuit (62).

In the main circuit (62), the expansion valve (5
The refrigerant on the upstream side of 7) splits, and one of the split refrigerants flows into the cooling circuit (61). The refrigerant flowing into the cooling circuit (61) is expanded by the expansion valve (68) and then cooled by the cooling heat exchanger (69).
In the cooling heat exchanger (69) to cool the secondary side refrigerant. Then, the refrigerant flowing out of the cooling heat exchanger (69) flows into the suction pipe of the compressor (54), and again flows into the main circuit (6).
Combine with the refrigerant in 2).

In the secondary side circuit (52), the four-way switching valve (88)
Is set as shown by the broken line in FIG. In this state, the pressurizing solenoid valves (P1, P2, P3) and the pressure reducing solenoid valves (V1, V2, V3) of the drive force generation circuit (82) are opened and closed to apply the transport drive force to the secondary side refrigerant. Then, in the use-side circuit (81), the secondary-side refrigerant undergoes a phase change between the indoor heat exchanger (83) and the first main heat exchanger (58) and the second main heat exchanger (89). The heat circulated and absorbed from the primary side circuit (51) and the exhaust heat circuit (53) is transferred to the indoor heat exchanger (83).

Concretely, the pressurizing solenoid valves (P1, P2, P3) will be described in the first state below. That is, in the first state, the pressurizing solenoid valve (P1) of the first tank (91), the pressure reducing solenoid valve (V2) of the second tank (92), and the auxiliary tank (93).
The pressure increasing solenoid valve (P3) of the first tank (91) and the pressure reducing solenoid valve (P2) of the second tank (92) are opened.
2) and the voltage solenoid valve (V3) of the auxiliary tank (93) are closed.

In this state, the first tank (91) communicates with the heating heat exchanger (66, 94). Heating heat exchanger (66,
At 94), the secondary side refrigerant evaporates and the heat exchanger (66,94)
The inside is maintained at high pressure. Therefore, the high-pressure gas refrigerant of the heating heat exchanger (66, 94) is supplied to the first tank (91) through the gas supply pipe (98), and thereby the first tank (91) is pressurized. When the first tank (91) is pressurized, the stored liquid refrigerant is discharged into the first tank (91).
Is extruded from. The liquid refrigerant extruded from the first tank (91) is extruded from the branch pipe (97a) of the extruded liquid pipe (97) as shown by a solid arrow in FIG.
To the liquid pipe (87) through the four-way switching valve (88).

On the other hand, the second tank (92) communicates with the cooling heat exchanger (69). In the cooling heat exchanger (69), the secondary side refrigerant is condensed and the inside of the cooling heat exchanger (69) is maintained in a low pressure state. Therefore, the gas refrigerant in the second tank (92) is sucked into the cooling heat exchanger (69) through the gas recovery pipe (48), whereby the pressure in the second tank (92) is reduced. Second
When the pressure of the tank (92) is reduced, the liquid refrigerant is recovered toward the second tank (92). That is, as shown by the solid line arrow in FIG. 4, the liquid refrigerant in the liquid pipe (85) is sucked and flows through the four-way switching valve (88), the recovery liquid pipe (96), and the branch pipe (96b) in this order. Collected in the second tank (92).

The auxiliary tank (93) communicates with the heating heat exchanger (66, 94). Therefore, the gas refrigerant of the heating heat exchanger (66, 94) is also supplied to the auxiliary tank (93) through the branch pipe (98c), and thereby the auxiliary tank (93).
Is pressurized. The liquid refrigerant is pushed out of the pressurized auxiliary tank (93). This liquid refrigerant flows through the buffer tank (95), the liquid recovery pipe (99), and the heating heat exchangers (66, 94) as shown by the broken line arrow in FIG. Then, the heating heat exchanger (66, 94) is maintained in a high pressure state by evaporating the liquid refrigerant sent through the liquid recovery pipe (99).

After that, when the auxiliary tank (93) becomes almost empty, this time the pressurizing solenoid valve (P3) of the auxiliary tank (93).
Is closed and the pressure reducing solenoid valve (V3) is opened. In this state,
The auxiliary tank (93) communicates with the cooling heat exchanger (69), and the auxiliary tank (93) is depressurized. Decompressed auxiliary tank (9
In part (3), a part of the refrigerant flowing through the extrusion liquid pipe (97) is recovered through the branch pipe (97c).

When the auxiliary tank (93) is filled with the liquid refrigerant, the pressurizing solenoid valve (P3) of the auxiliary tank (93) is opened again, and the pressure reducing solenoid valve (V3) is closed again.
The liquid refrigerant is sent from 3) to the heating heat exchanger (66, 94). The pressurization and depressurization of the auxiliary tank (93) as described above are repeated to supply the liquid refrigerant to the heating heat exchanger (66, 94).

In the utilization side circuit (81) of the secondary side circuit (52), the liquid refrigerant is pushed out of the first tank (91) and the liquid refrigerant is recovered in the second tank (92) as described above. ,
The secondary side refrigerant circulates.

Specifically, the liquid refrigerant extruded from the first tank (91) passes through the liquid pipe (87) to the first main heat exchanger (5
8) and the second main heat exchanger (89). The liquid refrigerant flowing into the first main heat exchanger (58) exchanges heat with the primary side refrigerant flowing through the primary side circuit (51) and evaporates. On the other hand, the liquid refrigerant that has flowed into the second main heat exchanger (89) flows into the exhaust heat circuit (5
3) Evaporates by exchanging heat with the heat medium flowing in. The gas refrigerant flowing out of the first main heat exchanger (58) and the indoor heat exchanger (9) flows through the gas pipe (84) and flows into the indoor heat exchanger (83). The gas refrigerant flowing into the indoor heat exchanger (83) exchanges heat with the indoor air and condenses. At this time, the indoor air is heated and heating is performed. The condensed refrigerant flows out of the indoor heat exchanger (83), then passes through the expansion valve (86), the reheat heat exchanger (90), and the four-way switching valve (88), and the recovery liquid pipe (96). Through the second tank (92).

After the operation in the first state described above is performed for a predetermined time, or after the liquid refrigerant in the first tank (91) falls below a predetermined amount, the solenoid valves (P1, P2, P3, V1, V2, V3 ) Is switched as follows.

In the second state, the pressurizing solenoid valve (P1) of the first tank (91) and the pressure reducing solenoid valve (V2) of the second tank (92) are closed, and the pressure reducing solenoid valve of the first tank (91) is closed. (V1) and second
Open the pressure solenoid valve (P2) of the tank (92). As a result, the first tank (91) is depressurized, while the second tank (92) is pressurized. Therefore, the liquid refrigerant extruded from the second tank (92) circulates as in the above-mentioned first state,
Collected in the first tank (91). The auxiliary tank (9
Opening and closing of the pressure solenoid valve (P3) and pressure reduction solenoid valve (V3) in 3) are performed at their own timing. That is, it is performed regardless of opening / closing of the pressurizing solenoid valves (P1, P2) and the pressure reducing solenoid valves (V1, V2) of the first and second tanks (91, 92).

(Cooling operation) Next, referring to FIG.
The operation during the cooling operation will be described. In the primary circuit (51),
The four-way switching valve (55) is set as shown by the solid line in FIG. In the main circuit (62) of the primary side circuit (51), the compressor (5
The refrigerant discharged from 4) passes through the four-way switching valve (55), flows into the outdoor heat exchanger (56), and is condensed in the outdoor heat exchanger (56). The refrigerant flowing out of the outdoor heat exchanger (56) passes through the receiver (63) and then expands in the expansion valve (57). The expanded refrigerant evaporates in the first main heat exchanger (58) and cools the secondary side refrigerant. The refrigerant flowing out of the first main heat exchanger (58) passes through the four-way switching valve (55) and is sucked into the compressor (54).

In the main circuit (62), the receiver (6
The refrigerant flowing out of 3) is split, and one of the split refrigerants flows into the heating circuit (60). The refrigerant flowing into the heating circuit (60) is condensed in the first heating heat exchanger (66) and heats the secondary side refrigerant in the first heating heat exchanger (66). And
The refrigerant flowing out of the first heating heat exchanger (66) returns to the main circuit (62) again and merges with the refrigerant flowing in the main circuit (62).

In the main circuit (62), the expansion valve (5
The refrigerant on the upstream side of 7) splits, and one of the split refrigerants flows into the cooling circuit (61). The refrigerant flowing into the cooling circuit (61) is expanded by the expansion valve (68) and then cooled by the cooling heat exchanger (69).
In the cooling heat exchanger (69) to cool the secondary side refrigerant. Then, the refrigerant flowing out of the cooling heat exchanger (69) flows into the suction pipe of the compressor (54), and again flows into the main circuit (6).
Combine with the refrigerant in 2).

In the secondary side circuit (52), the four-way switching valve (88)
Is switched as shown by the solid line in Fig. 5, and in this state the pressurizing solenoid valve (P1, P2, P3) and the pressure reducing solenoid valve (V1, V2, V3) are opened and closed, and the circulation driving force is applied to the secondary side refrigerant Granted. The solid arrow in FIG. 5 indicates the flow of the refrigerant in a state (second state) in which the liquid refrigerant is pushed out of the second tank (92) and collected in the first tank (91).

The operation of the driving force generation circuit (82) is similar to that in the heating operation described above. Then, in the use-side circuit (81), the secondary-side refrigerant undergoes a phase change between the indoor heat exchanger (83) and the first main heat exchanger (58) and the second main heat exchanger (89). The cold heat that circulates and is generated in the primary side circuit (51) is conveyed to the indoor heat exchanger (83).

Specifically, the liquid refrigerant extruded from the second tank (92) is sent to the liquid pipe (85) through the extruding liquid pipe (97) and the four-way switching valve (88). Liquid tube (8
The refrigerant flowing through 5) is heated in the reheat heat exchanger (90) by exchanging heat with the heat medium flowing through the exhaust heat circuit (53). In the reheat heat exchanger (90), the refrigerant is heated to a temperature slightly higher than the dew point temperature of air around the liquid pipe (85). That is, the liquid refrigerant from the second tank (92) is heated to a predetermined temperature by the reheat heat exchanger (90) and supplied to the indoor heat exchanger (83). Therefore, no condensation occurs in the liquid pipe (85) on the downstream side of the reheat heat exchanger (90).

Next, the refrigerant flowing out of the reheat heat exchanger (90) is decompressed by the expansion valve (86) and then the indoor heat exchanger (83).
Flow into. In the indoor heat exchanger (83), the refrigerant and the indoor air exchange heat, and the refrigerant evaporates. At this time, the indoor air is cooled and the room is cooled. Indoor heat exchanger (8
The refrigerant evaporated in 3) flows through the gas pipe (84) into the first main heat exchanger (58) and the second main heat exchanger (89).

In the first main heat exchanger (58), the secondary side refrigerant exchanges heat with the primary side refrigerant in the primary side circuit (51) and condenses. On the other hand, in the second main heat exchanger (89), the secondary side refrigerant exchanges heat with the heat medium of the exhaust heat circuit (53) and condenses.

The refrigerant condensed in the first main heat exchanger (58) and the second main heat exchanger (89) passes through the liquid pipe (87) and the four-way switching valve (88), and the recovery liquid pipe ( It is collected from 96) into the first tank (91).

After the operation in the second state as described above is performed for a predetermined time, the pressurizing solenoid valves (P1, P2) and the pressure reducing solenoid valves (V1, V2) of the driving force generating circuit (82) are switched to the above-mentioned first state. A one-state operation is performed.

As described above, by alternately switching the first state and the second state, the secondary side refrigerant continuously circulates in the utilization side circuit (81). The pressurizing solenoid valve (P3) and the reducing solenoid valve (V3) of the auxiliary tank (93) are opened and closed at their own timing.

-Effects-As described above, according to the present embodiment, in the second heating heat exchanger (94), the heat medium of the exhaust heat circuit (53) and the secondary side of the secondary side circuit (52). Since the secondary side refrigerant is heated by the heat exchange with the refrigerant and the exhaust heat of the dispersed power source (1) is used, the exhaust heat of the dispersed power source (1) is effectively used to generate the carrier driving force for the secondary side refrigerant. can do.

During the heating operation, the second main heat exchanger (8
9), the heat medium of the exhaust heat circuit (53) and the secondary side circuit (5
Since the secondary side refrigerant of 2) is heat-exchanged and the secondary side refrigerant is heated by the exhaust heat of the dispersed power source (1), the exhaust heat of the dispersed power source (1) is effectively used as a part of the heat source during heating. Can be used.

Further, during the cooling operation, the reheat heat exchanger (90)
In the exhaust heat circuit (53), the heat medium and the secondary side circuit (52)
Since the secondary side refrigerant of the liquid pipe (85) is heat-exchanged and the secondary side refrigerant is heated by the exhaust heat of the dispersed power source (1), the exhaust heat of the dispersed power source (1) is transferred to the liquid pipe (85). It can be effectively used to prevent dew condensation.

As described above, also in this embodiment, the exhaust heat of the distributed power source (1) can be effectively utilized, and the utilization efficiency of the distributed power source (1) can be improved.

Also in this embodiment, the electricity of the distributed power source (1) is used to drive the compressor (4). Also,
Of course, the electricity of the distributed power source (1) may be used to operate the outdoor blower (64) or the indoor blower (64a).

[Brief description of drawings]

FIG. 1 is a configuration diagram of an air conditioner according to a first embodiment.

FIG. 2 is a configuration diagram of an air conditioner according to a modified example of the first embodiment.

FIG. 3 is a configuration diagram of an air conditioner according to a second embodiment.

FIG. 4 is a configuration diagram showing refrigerant circulation during heating operation in the air-conditioning apparatus according to Embodiment 2.

FIG. 5 is a configuration diagram showing refrigerant circulation during a cooling operation in the air-conditioning apparatus according to the second embodiment.

[Explanation of symbols]

(1) Distributed power supply (2) Refrigerant circuit (3) Heat exhaust circuit (4) Compressor (5) Four-way switching valve (6) Outdoor heat exchanger (7) Bridge circuit (8) Indoor electric valve (9) Indoor heat exchanger (19) Receiver (22) Exhaust heat recovery circuit (24) Heat recovery heat exchanger (27) First electricity supply unit (28) Second electricity supply section (58) 1st main heat exchanger (main heat exchanger) (89) Second main heat exchanger (main heat exchanger) (91) First tank (first refrigerant storage means) (92) Second tank (second refrigerant storage means) (100) Air conditioner

Claims (7)

[Claims] 1. A distributed power source (1), a compressor (4), a heat source side heat exchanger (6), a pressure reducing mechanism (20),
Refrigerant circuit (2) having a utilization side heat exchanger (9) and a heat recovery heat exchanger (24) for recovering exhaust heat of the distributed power source (1)
And a refrigerating device provided with. 2. The refrigeration system according to claim 1, further comprising an electricity supply means (28) for supplying electricity from the distributed power source (1) to the compressor (4). 3. The refrigerating apparatus according to claim 1, wherein at least one of the heat source side heat exchanger (6) and the use side heat exchanger (9) is provided with a blower (25, 26). A refrigeration system provided with an electricity supply means (28) for supplying electricity from the dispersed power source (1) to the blower (25, 26). 4. The refrigerating apparatus according to claim 1, wherein the heat exchanger on the utilization side is installed indoors to exchange heat between the refrigerant in the refrigerant circuit (2) and the indoor air. The heat recovery heat exchanger is composed of an indoor heat exchanger (9) to be driven, and the heat recovery heat exchanger is composed of an auxiliary evaporator (24) for evaporating the refrigerant of the refrigerant circuit (2) by the exhaust heat of the dispersed power source (1) during heating operation. Refrigeration equipment. 5. A primary side circuit (51), in which a dispersed power source (1), a primary side circuit (51) through which a primary side refrigerant circulates, and a secondary side circuit (52) through which a secondary side refrigerant circulates are provided. The circuit (51) includes a compressor (54), a main heat exchanger (89) that heats the secondary side refrigerant by the exhaust heat of the dispersed power source (1) during heating operation, and a primary side refrigerant is condensed. A heating heat exchanger (66) for heating the secondary-side refrigerant and a cooling heat exchanger (69) for evaporating the primary-side refrigerant to cool the secondary-side refrigerant. 52), a use side circuit (81) provided with the main heat exchanger (89) and a use side heat exchanger (83), a first refrigerant storage means (91) and a second refrigerant storage means (91). 92) and pressurizes one refrigerant storage means at high pressure in the heating heat exchanger (66) and depressurizes and pressurizes the other refrigerant storage means at low pressure in the cooling heat exchanger (69). Refrigeration system in which the driving force generating circuit (82) for a refrigerant flow directed to the refrigerant storage means which is depressurized refrigerant reservoir means for generating on the utilization side circuit (81) which is provided. 6. A primary side circuit (51) having a dispersed power source (1), a primary side circuit (51) in which a primary side refrigerant circulates, and a secondary side circuit (52) in which a secondary side refrigerant circulates. The circuit (51) includes a compressor (54), a main heat exchanger (58) that transfers hot or cold heat generated in the primary side circuit (51) to the secondary side circuit (52), A heating heat exchanger (94) that heats the secondary side refrigerant by the exhaust heat of the dispersed power source (1) and a cooling heat exchanger (69) that evaporates the primary side refrigerant and cools the secondary side refrigerant are provided. The secondary side circuit (52) includes a use side circuit (81) provided with the main heat exchanger (58) and a use side heat exchanger (83), and a first refrigerant storage means (91). ) And a second refrigerant storage means (92), and pressurizes one of the refrigerant storage means with the high pressure in the heating heat exchanger (94) and the other refrigerant with a low pressure in the cooling heat exchanger (69). Savings Depressurizing the unit, the refrigeration driving force generating circuit for generating a coolant flow toward the refrigerant storage means is reduced from the pressurized refrigerant reservoir means to the utilization side circuit (81) and (82) are provided devices. 7. A primary side circuit (51) comprising a distributed power source (1), a primary side circuit (51) in which a primary side refrigerant circulates, and a secondary side circuit (52) in which a secondary side refrigerant circulates, The circuit (51) includes a compressor (54), a main heat exchanger (58) that transfers hot or cold heat generated in the primary side circuit (51) to the secondary side circuit (52), A heating heat exchanger (66) for condensing the secondary side refrigerant to heat the secondary side refrigerant and a cooling heat exchanger (69) for evaporating the primary side refrigerant to cool the secondary side refrigerant are provided. In the secondary side circuit (52), a utilization side circuit (81) provided with the main heat exchanger (58) and a utilization side heat exchanger (83), a first refrigerant storage means (91) and A second refrigerant storage means (92) is provided, and one refrigerant storage means is pressurized by the high pressure in the heating heat exchanger (66) and the other refrigerant storage means is operated by the low pressure in the cooling heat exchanger (69). To And a driving force generation circuit (82) for generating a refrigerant flow from the pressurized and pressurized refrigerant storage means to the depressurized refrigerant storage means in the utilization side circuit (81), and the secondary side circuit (52). ), The liquid pipe (85) of the use side heat exchanger (83) in the use side circuit (81) disperses the liquid refrigerant flowing from the pressurized refrigerant storage means toward the use side heat exchanger (83). A refrigeration system provided with a reheat heat exchanger (90) that is heated by exhaust heat of a power source (1).