JP2001280749A - Refrigerating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an effective recovering of waste heat applied for refrigeration or freezing to be carried out as a heating source and further enable either a refrigerating capability or a refrigerating capability to be always assured. SOLUTION: There is provided a refrigerating device constructed such that a heat recovering circuit B is formed for circulating refrigerant fed from a compressor 1 at the time of heating operation through a four-way changing-over valve 2, a utilization side heat exchanger 5, a pressure reducing mechanism 4 and an evaporator 6 for refrigeration or freezing operation. This freezer is provided with a heating load increasing means acting to increase an indoor heating load. Waste heat used as the source for refrigeration or freezing at the evaporator 6 at the time of heating operation is recovered at a utilizing side heat exchanger 5 as a heating source and further even if a requisite capability balance between the utilizing side heat exchanger 5 and the evaporator 6 becomes an unbalanced state due to decreasing in the heating load, its balanced state can be assured by the heating load increasing means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system having a use side heat exchanger for indoor air conditioning and an evaporator for refrigeration.

[0002]

2. Description of the Related Art For example, in a convenience store or the like, a refrigerating refrigeration system for refrigeration of a product and an air conditioning refrigeration system for air-conditioning a room are required. It consisted of a refrigerant circuit.

[0003]

In the case of the refrigeration system for refrigeration or freezing, the waste heat used for refrigeration or freezing is externally supplied by a heat source-side heat exchanger installed outdoors. And was not being used effectively.

Therefore, a use side heat exchanger for indoor air conditioning and an evaporator for refrigeration or freezing are provided in parallel, and during heating operation, waste heat used in the evaporator for refrigeration or freezing is used for air conditioning. A refrigerating device capable of recovering heat, which is used as a heating heat source in a side heat exchanger, has been proposed.

However, in the case of the refrigeration system capable of recovering heat having the above-mentioned structure, there is no problem when the indoor heating load is large, but the indoor heating load is reduced and the use side heat exchanger for air conditioning and the refrigeration or freezing evaporator are not used. If the required capacity balance becomes unbalanced, there is a possibility that a problem that desired refrigeration or freezing capacity cannot be obtained.

[0006] The present invention has been made in view of the above points, and aims to effectively recover waste heat used for refrigeration or freezing as a heating heat source and to always ensure refrigeration or freezing capacity. It is the purpose.

[0007]

According to the first aspect of the present invention, as a means for solving the above-mentioned problems, a compressor 1, a four-way switching valve 2, and a condenser functioning during a cooling operation and acting as a condenser during a cooling operation. A heat source side heat exchanger 3 acting as an evaporator, a pressure reducing mechanism 4, a room side air conditioner use side heat exchanger 5 acting as an evaporator during a cooling operation and acting as a condenser during a heating operation; A refrigeration or freezing evaporator 6 connected in parallel with the heat exchanger 5, wherein the refrigerant from the compressor 1 is supplied to the four-way switching valve 2 and the utilization side heat exchanger 5 during the heating operation. In the refrigerating apparatus that constitutes the heat recovery circuit B that circulates through the pressure reducing mechanism 4 and the evaporator 6, a heating load increasing unit that acts to increase the indoor heating load is additionally provided.

With the above-described structure, during the heating operation, waste heat used as a refrigeration or freezing heat source in the evaporator 6 is recovered in the use side heat exchanger 5 as a heating heat source. Even when the required load balance between the use-side heat exchanger 5 and the evaporator 6 becomes unbalanced due to a decrease in the heating load, the balance can be ensured by the heating load increasing means.

According to a second aspect of the present invention, as a means for solving the above problems, a compressor 1, a four-way switching valve 2, and a heat source which acts as a condenser during a cooling operation and acts as an evaporator during a heating operation Side heat exchanger 3, a pressure reducing mechanism 4, a use side heat exchanger 5 for indoor air conditioning that acts as an evaporator during the cooling operation and acts as a condenser during the heating operation, and is parallel to the use side heat exchanger 5. Or refrigeration evaporator 6 connected to
A heat recovery circuit B that circulates the refrigerant from the compressor 1 through the four-way switching valve 2, the use side heat exchanger 5, the pressure reducing mechanism 4, and the evaporator 6 during the heating operation. In the refrigeration system, the indoor heating load is reduced and the use side heat exchanger 5 and the evaporator 6 are reduced.
Heating load increasing means that acts to increase the indoor heating load when the required capacity balance becomes imbalanced.

With the above-described structure, during the heating operation, waste heat used as a refrigeration or freezing cold heat source in the evaporator 6 is recovered in the use side heat exchanger 5 as a heating heat source. When the required load balance between the use-side heat exchanger 5 and the evaporator 6 becomes unbalanced due to a decrease in the heating load, the indoor heating load is increased by the heating load increasing means, and the cooling in the evaporator 6 is performed. Capability can be secured.

[0011] As in the invention of claim 3, claim 1
The refrigeration apparatus according to any one of claims 2 and 3, wherein the heating load increasing means is provided with a ventilation fan 41 for ventilating room air.
And control means for controlling the start and stop of the ventilation fan 41, the interior heating load can be increased by starting to drive the ventilation fan 41 which is an existing facility.

As in the invention of claim 4, claim 1
In the refrigeration apparatus according to any one of (2) and (3), when the heating load increasing unit is configured by a unit that controls the air volume of the indoor fan 33 attached to the use-side heat exchanger 5, it is an existing facility. By controlling the air volume of the indoor fan 33, the indoor heating load can be increased.

As in the fifth aspect of the present invention, in the refrigeration apparatus according to any one of the first to third aspects, the high pressure Ph which is the discharge pressure of the compressor 1 is equal to or higher than a set value Phs. When the heating load increasing means is actuated in such a case, the high pressure Ph becomes equal to the set value Ph.
s or more, the heating load increasing means is actuated (for example, the ventilation fan 41 is driven),
It is possible to prevent a decrease in the capacity of the evaporator 6 due to a decrease in the indoor heating load while preventing an abnormal increase in the high pressure Ph.

As in the invention of claim 6, in the refrigerating apparatus according to any one of claims 1, 2, 3, and 4, a plurality of the use-side heat exchangers 5 are provided,
When the number of thermostats among the use-side heat exchangers 5, 5,... Becomes equal to or more than a predetermined number, the heating load increasing means is operated.
················································································································································ Can be prevented.

As in the invention of claim 7, in the refrigerating apparatus according to any one of claims 1, 2, 3 and 4, the temperature difference between the set temperature Ts in the use side heat exchanger 5 and the room temperature Tr. When the heating load increasing means is operated when ΔT becomes smaller than the predetermined value ΔTs, the set temperature Ts and the room temperature Tr in the use side heat exchanger 5 are set.
When the temperature difference ΔT is smaller than the predetermined value ΔTs, the heating load increasing means is actuated (for example, the ventilation fan 41 is started to drive), and the performance of the evaporator 6 due to the decrease in the indoor heating load is reduced. Can be prevented.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

First Embodiment FIG. 1 shows a refrigerant circuit of a refrigerating apparatus according to a first embodiment of the present invention.

This refrigerating apparatus comprises a pair of compressors 1, 1 connected in parallel, a four-way switching valve 2, a heat source side heat exchanger 3 having an outdoor fan 11, and an expansion valve 4 acting as a pressure reducing mechanism.
And a heat pump type air conditioning refrigerant circuit A configured by sequentially connecting the use side heat exchangers 5 through a refrigerant pipe, and a branch from the downstream side of the expansion valve 4 in the heat pump type air conditioning refrigerant circuit A, and refrigeration. And a refrigeration circuit (in other words, a heat recovery circuit) B connected to the suction side of the compressors 1 and 1 via the evaporator 6.

Between the heat source side heat exchanger 3 and the expansion valve 4, a receiver 7 connected to the outlet side of the heat source side heat exchanger 3 during cooling operation, and a liquid of the receiver 7. Liquid refrigerant from the phase section is transferred to an external heat medium (for example, outdoor air)
The air-cooled first supercooling heat exchanger 8 which is supercooled by the pressure reducing part of the supercooling liquid refrigerant from the first supercooling heat exchanger 8 is reduced by the temperature-sensitive expansion valve 9. And a second triple cooling type supercooling heat exchanger 9 for further supercooling by the latent heat of vaporization of the gas-liquid mixed refrigerant obtained as described above. The second
The gas refrigerant evaporated and vaporized in the supercooling heat exchanger 9 of
It is to be supplied to the suction side of the compressors 1, 1 via the low-pressure gas pipe 12. The temperature-sensitive cylinder 10 a of the temperature-sensitive expansion valve 10 is attached to the low-pressure gas pipe 12. Reference numeral 13 denotes an electromagnetic on-off valve that is opened only when a part of the liquid refrigerant is supplied to the second subcooling heat exchanger 9.
In the present embodiment, the outdoor fan 11
Is shared by the use side heat exchanger 3 and the first subcooling heat exchanger 8.

At the inlet side of the receiver 7, a bridge circuit 14 having four check valves 14a to 14d is provided. During the cooling operation, the bridge circuit 14 guides the liquid refrigerant from the heat source side heat exchanger 3 to the receiver 7 and guides the liquid refrigerant from the receiver 7 to the use side heat exchanger 5 after passing through the expansion valve 4 to perform the heating operation. At times, it functions as a flow path switching mechanism that guides the liquid refrigerant from the use side heat exchanger 5 to the receiver 7 and guides the liquid refrigerant from the receiver 7 to the heat source side heat exchanger 3 after passing through the expansion valve 4. Reference numeral 15 denotes a check valve that permits the flow of the liquid refrigerant from the heat source side heat exchanger 3 to the receiver 7 only during the cooling operation, and 16 denotes an open valve that operates during the heating operation to connect the expansion valve 4 to the use side heat exchanger 3. An electromagnetic opening / closing valve that allows the refrigerant to flow and closes during the heating operation to allow the refrigerant to flow from the expansion valve 4 to the refrigeration evaporator 6.

The upstream liquid pipe 17 of the refrigeration evaporator 6 in the refrigeration refrigerant circuit B has a refrigeration refrigerant circuit C to be described later.
A plate heat exchanger 19 for exchanging heat with the refrigerant gas discharged from the refrigerating compressor 18 is provided.

The refrigerating refrigerant circuit C includes the refrigerating compressor 18, the plate heat exchanger 19, the temperature-sensitive expansion valve 20,
The refrigeration evaporator 21 and the accumulator 22 are sequentially connected via a refrigerant pipe.

Between the utilization side heat exchanger 5 and the bridge circuit 14, a series circuit 23a of an electromagnetic on-off valve 24 and a check valve 25 for permitting refrigerant flow only during the cooling operation, and an electromagnetic on-off valve 26 Reversible flow mechanism 2 including a series circuit 23b of a check valve 27 and a check valve 27 permitting refrigerant flow only during the heating operation.
3 are interposed. Reference numeral 28 denotes a liquid escape capillary tube that bypasses the electromagnetic on-off valve 26.

The refrigeration refrigerant circuit B is provided with a bypass circuit 29 for bypassing the refrigeration evaporator 6. The bypass circuit 29 has an electromagnetic opening / closing operation which is opened only when the operation of the refrigeration evaporator 6 is stopped. A valve 30 is provided. Reference numeral 31 denotes an electromagnetic on / off valve that is closed only when the operation of the refrigerating evaporator 6 is stopped, 32 denotes an electromagnetic on / off valve that is closed only when the operation of the refrigerating evaporator 21 is stopped, and 33 denotes a use side heat exchanger 5. The attached indoor fan, 34 is a refrigeration fan attached to the refrigeration evaporator 6, and 35 is a refrigeration fan attached to the refrigeration evaporator 21.

An oil separator 36 for separating the lubricating oil contained in the gas refrigerant is provided on the discharge side of the compressors 1 and 1. The lubricating oil separated by the oil separator 36 is an oil separator. The air is returned to the suction pipe 38 of the compressors 1 and 1 via the return pipe 37. Reference numeral 39 denotes an electromagnetic on-off valve that is opened when the oil is returned.

A ventilation fan 41 for ventilating room air is provided at a ventilation port 40 of a room in which the refrigeration apparatus is installed.

In the drawings, reference numeral 42 denotes a pressure sensor which functions as a high pressure detecting means for detecting a high pressure which is a discharge pressure of the compressors 1, 1, 43 denotes a room temperature sensor which detects indoor air temperature, and 44 denotes a discharged gas refrigerant. Is a pressure sensor for detecting the pressure of the suction gas refrigerant, 46 is an outside air temperature sensor for detecting the outside air temperature, and 47 and 48 are closing valves.

As shown in FIG. 2, the refrigeration system having the above-described configuration includes detection signals from the pressure sensor 42, the room temperature sensor 43, the discharge temperature sensor 44, the pressure sensor 45, the outside air temperature sensor 46, etc., and the air conditioning temperature setting temperature. A controller 50 that acts as a control unit that receives signals from the temperature setter 49 for setting Ts and performs various types of arithmetic processing is provided.
Four-way switching valve 2, outdoor fan 11, solenoid on-off valve 13, 1
6, refrigeration compressor 18, solenoid on-off valves 24, 26, 30,
Control signals are output to 31, 32, the indoor fan 33, the refrigerating fan 34, the refrigerating fan 35, the electromagnetic switching valve 39, and the ventilation fan 41. That is, in the present embodiment, the ventilation fan 41 and the control means for controlling the start / stop of the ventilation fan 41 reduce the indoor heating load and the required capacity balance between the use side heat exchanger 5 and the evaporator 6 is imbalanced. In this case, a heating load increasing means that acts to increase the indoor heating load is configured.

In the present embodiment, the controller 50 starts driving the ventilation fan 41 when the high pressure Ph which is the discharge pressure of the compressors 1 and 1 becomes equal to or higher than the set value Phs during the heating heat recovery operation. And a function of outputting a control signal to be performed.

In the refrigeration apparatus configured as described above, the following operational effects can be obtained. (I) Cooling operation At this time, the four-way switching valve 2 is switched as shown by the solid line, the electromagnetic switching valve 13 is opened, the electromagnetic switching valve 16 is closed, the electromagnetic switching valve 24 is opened, and the electromagnetic switching valve 24 is opened. On-off valve 2
6 is closed, the electromagnetic on-off valve 30 is closed, the electromagnetic on-off valves 31 and 32 are opened, and the electromagnetic on-off valve 39 is opened. In the air conditioning refrigerant circuit A, the compressors 1 and 2 are closed.
After the gas refrigerant discharged from 1 is condensed and liquefied in the heat source side heat exchanger 3 acting as a condenser, the gas refrigerant is sent to the receiver 7 through the check valve 15 and the bridge circuit 14, and the liquid in the receiver 7 The liquid refrigerant from the phase portion is supercooled by heat exchange with outdoor air in the first subcooling heat exchanger 8, and when further supercooling is required (that is, when the electromagnetic on-off valve 13 is opened) ), The supercooled liquid refrigerant from the first supercooled heat exchanger 8 is a part of the supercooled liquid refrigerant in the second supercooled heat exchanger 9 and is decompressed by the temperature-sensitive expansion valve 10. The vapor-liquid mixed refrigerant is further supercooled by the latent heat of vaporization, decompressed by the expansion valve 4, supplied to the use-side heat exchanger 5 and evaporated, and the obtained latent heat of vaporization is used as a cooling source for cooling. The refrigerant is returned to the compressors 1, 1.

In the refrigeration refrigerant circuit B, the refrigerant decompressed by the expansion valve 4 branches off from the air conditioning refrigerant circuit A and passes through the plate heat exchanger 19 to the refrigeration evaporator 6.
, And is evaporated, and the obtained latent heat of evaporation is used as a cold heat source for refrigeration, and then returned to the compressors 1, 1.

Further, in the refrigeration circuit C, the gas refrigerant discharged from the refrigeration compressor 18 flows through the liquid pipe 17 in the refrigeration circuit B in the plate heat exchanger 19 acting as a condenser. After being condensed and liquefied by heat exchange with the liquid refrigerant, the pressure is reduced by the expansion valve 20 and supplied to the refrigerating evaporator 21 to evaporate. The obtained latent heat of evaporation is used as a refrigerating cold heat source. Is returned to the compressor 18 through the compressor. (II) Heating operation At this time, the four-way switching valve 2 is switched as shown by the solid line, the electromagnetic switching valve 13 is opened, the electromagnetic switching valve 16 is closed, the electromagnetic switching valve 24 is closed, and the electromagnetic switching valve 24 is closed. On-off valve 2
6 is opened, the electromagnetic on / off valve 30 is closed, the electromagnetic on / off valves 31 and 32 are opened, and the electromagnetic on / off valve 39 is opened. In the air conditioning refrigerant circuit A, the compressors 1 and 2 are opened.
After the gas refrigerant discharged from 1 is condensed and liquefied in the use side heat exchanger 5 acting as a condenser, and the obtained condensation latent heat is used as a heating heat source, the check valve 15 and the bridge circuit 14 are turned off. The liquid refrigerant sent to the receiver 7 via the liquid phase portion of the receiver 7 is supercooled by heat exchange with outdoor air in the first subcooling heat exchanger 8, and further supercooling is required (ie, , When the solenoid on-off valve 13 is opened), the first subcooling heat exchanger 8
Is supercooled further by the latent heat of vaporization of the gas-liquid mixed refrigerant which is a part of the supercooled liquid refrigerant and is decompressed by the temperature-sensitive expansion valve 10 in the second supercooled heat exchanger 9. The pressure is reduced by the expansion valve 4 and supplied to the evaporator 6 via the plate heat exchanger 19 in the refrigeration refrigerant circuit B to evaporate. The obtained latent heat of evaporation is used as a refrigeration cold heat source. Refluxed to 1.

In the refrigeration circuit C, gas refrigerant discharged from the refrigeration compressor 18 flows through the liquid pipe 17 in the refrigeration circuit B in the plate heat exchanger 19 acting as a condenser. After being condensed and liquefied by heat exchange with the liquid refrigerant, the pressure is reduced by the expansion valve 20 and supplied to the refrigerating evaporator 21 to evaporate. The obtained latent heat of evaporation is used as a refrigerating cold heat source.
The refrigerant is returned to the compressor 18 through the line 2.

As described above, in the present embodiment, the evaporator 6 in the refrigeration circuit B during the heating operation is used.
Thus, the waste heat used as the cold heat source for refrigeration is recovered in the use-side heat exchanger 5 as the heating heat source.

When the indoor heating load is large as in winter, the required capacity of the use side heat exchanger 5 and the required capacity of the evaporator 6 are balanced. Although the cooling capacity of the heat exchanger 6 can be ensured, when the indoor heating load is reduced as in the intermediate period, the balance between the necessary capacity in the use side heat exchanger 5 and the required capacity in the evaporator 6 becomes unbalanced. As a result, there may be a case where the cooling capacity of the evaporator 6 cannot be secured.
Therefore, in the present embodiment, a decrease in the indoor heating load is detected as an increase in the high pressure Ph which is the discharge pressure of the compressors 1, 1, and the ventilation fan 4 is increased to increase the indoor heating load.
1 is driven.

The control for increasing the indoor heating load during the heating operation will be described in detail below with reference to the flowchart shown in FIG.

When the high pressure Ph detected by the pressure sensor 42 is input to the controller 50 in step S1, the high pressure Ph is compared with a set value Phs in step S2, and it is determined that Ph ≧ Phs. If this is the case, the operation proceeds to step S3, in which the driving of the ventilation fan 41 is started. The operation proceeds to step S4, and if it is determined that Ph <Phs, the driving of the ventilation fan 41 is stopped.

With the above arrangement, when the required load balance between the use side heat exchanger 5 and the evaporator 6 becomes unbalanced due to a decrease in the heating load, the ventilation fan 41 is driven to drive the indoor air. Ventilation is performed to increase the indoor heating load, and the cooling capacity of the evaporator 6 can be secured.

By the way, even if the heating load is increased by driving the ventilation fan 41, the cooling capacity of the evaporator 6 may not be ensured in some cases. In this case, when the driving of the indoor fan 33 is stopped, the four-way switching valve 2 is switched to the cooling operation side (that is, the side shown by the solid line), and the heat source side heat exchanger 3 acts as a condenser, the evaporator 6 Can cover the lack of cooling capacity.

When the refrigeration / refrigeration load is reduced during the heating operation (in other words, when the low pressure which is the suction pressure of the compressors 1, 1 is reduced), the indoor fan 3
When the air volume of 3 is automatically reduced, the capacity balance between the use side heat exchanger 5 and the evaporator 6 can be achieved.

Second Embodiment FIGS. 4 and 5 show a flowchart of a refrigerant circuit and an indoor heating load increase control of a refrigeration apparatus according to a second embodiment of the present invention.

In this case, a plurality of use-side heat exchangers 5, 5,... Are connected in parallel to the air-conditioning refrigerant circuit A to reduce the indoor heating load. The number of thermostats is detected as an increase, and the ventilation fan 41 is driven to increase the indoor heating load.

The control for increasing the indoor heating load during the heating operation will be described in detail below with reference to the flowchart shown in FIG.

In step S1, the number of thermostats stopped N
When (for example, detected by a stop signal of the indoor fan 33) is input to the controller 50, the number N of thermo-stops is compared with a set value Ns in step S2, and when it is determined that N ≧ Ns, Proceeds to step S3, the driving of the ventilation fan 41 is started, and if it is determined that N <Ns, the process proceeds to step S4, and the driving of the ventilation fan 41 is stopped.

With the above arrangement, if the required load balance between the use side heat exchanger 5 and the evaporator 6 becomes imbalanced due to a decrease in the heating load, the ventilation fan 41 is driven to drive the indoor air. Ventilation is performed to increase the indoor heating load, and the cooling capacity of the evaporator 6 can be secured.

By the way, even if the heating load is increased by driving the ventilation fan 41, the cooling capacity of the evaporator 6 may not be ensured in some cases. In this case, the driving of all the indoor fans 33, 33,... Is stopped, the four-way switching valve 2 is switched to the cooling operation side (that is, the side shown by the solid line), and the heat source side heat exchanger 3 acts as a condenser. By doing so, it is possible to cover the shortage of the cooling capacity in the evaporator 6.

The other configuration, operation, and effect are the same as those in the first embodiment, and the description is omitted.

Third Embodiment FIG. 6 shows a flowchart of the control for increasing the indoor heating load in a refrigeration apparatus according to a third embodiment of the present invention.

In this case, a decrease in the indoor heating load is detected as a decrease in the difference between the air conditioning set temperature Ts and the room temperature Tr in the use side heat exchanger 5, and the ventilation fan 41 is driven to increase the indoor heating load. ing.

The control for increasing the indoor heating load during the heating operation will be described in detail below with reference to the flowchart shown in FIG.

In step S 1, the air-conditioning set temperature Ts and the room temperature sensor 43 set by the temperature setter 49 are set.
Is input to the controller 50, the difference temperature ΔT between the air-conditioning set temperature Ts and the room temperature Tr is calculated in step S2, and the difference temperature ΔT is compared with the set value ΔTs in step S3. Where ΔT
If it is determined that ≦ ΔTs, the process proceeds to step S4,
The driving of the ventilation fan 41 is started, and when it is determined that ΔT> ΔTs, the process proceeds to step S5, and the driving of the ventilation fan 41 is stopped.

When the heating load is reduced and the required capacity balance between the use side heat exchanger 5 and the evaporator 6 becomes imbalanced by the above-described operation, the ventilation fan 41 is driven to drive the indoor air. Ventilation is performed to increase the indoor heating load, and the cooling capacity of the evaporator 6 can be secured.

By the way, even if the heating load is increased by driving the ventilation fan 41, the cooling capacity of the evaporator 6 may not be ensured in some cases. In this case, when the driving of the indoor fan 33 is stopped, the four-way switching valve 2 is switched to the cooling operation side (that is, the side shown by the solid line), and the heat source side heat exchanger 3 acts as a condenser, the evaporator 6 Can cover the lack of cooling capacity.

The other configuration and operation and effect are the same as those in the first embodiment, and the description is omitted.

[0055]

According to the first aspect of the present invention, the compressor 1 includes:
A four-way switching valve 2, a heat source-side heat exchanger 3 acting as a condenser during cooling operation and acting as an evaporator during heating operation,
A decompression mechanism 4, a use-side heat exchanger 5 for indoor air conditioning that acts as an evaporator during a cooling operation and acts as a condenser during a heating operation, and a refrigeration or refrigeration connected in parallel with the use-side heat exchanger 5. And a refrigerant from the compressor 1 during the heating operation through the four-way switching valve 2, the use side heat exchanger 5, the pressure reducing mechanism 4, and the evaporator 6. In the refrigerating apparatus having the heat recovery circuit B to be configured, a heating load increasing means for increasing the indoor heating load is provided, and is used as a refrigeration or freezing heat source in the evaporator 6 during the heating operation. The used waste heat is recovered as a heating heat source in the use side heat exchanger 5, and the heating load is reduced to reduce the use side heat exchanger 5
Even if the required capacity balance between the fuel cell and the evaporator 6 becomes imbalanced, there is an effect that the balance can be secured.

According to the second aspect of the present invention, the compressor 1, the four-way switching valve 2, the heat source side heat exchanger 3 which acts as a condenser during the cooling operation and acts as an evaporator during the heating operation, A mechanism 4, a use side heat exchanger 5 for indoor air conditioning that acts as an evaporator during the cooling operation and a condenser during the heating operation, and a refrigeration or freezing unit connected in parallel with the use side heat exchanger 5. And the refrigerant from the compressor 1 is circulated through the four-way switching valve 2, the use side heat exchanger 5, the pressure reducing mechanism 4, and the evaporator 6 during the heating operation. In the refrigerating apparatus configured to constitute the heat recovery circuit B, when the indoor heating load decreases and the required capacity balance between the use side heat exchanger 5 and the evaporator 6 becomes unbalanced, the indoor heating load is reduced. Includes heating load increasing means that acts to increase During the heating operation, the waste heat used as the refrigeration or freezing heat source in the evaporator 6 is recovered as the heating heat source in the use-side heat exchanger 5, and the heating load is reduced to reduce the use-side heat. When the required capacity balance between the exchanger 5 and the evaporator 6 becomes imbalanced, the indoor heating load is increased by the heating load increasing means, so that the waste heat used for the refrigeration cold heat source is heated. There is an effect that the cooling capacity in the evaporator 6 can be secured while being effectively used as a heat source.

As in the invention of claim 3, claim 1
The refrigeration apparatus according to any one of claims 2 and 3, wherein the heating load increasing means is provided with a ventilation fan 41 for ventilating room air.
And control means for controlling the start and stop of the ventilation fan 41, the interior heating load can be increased by starting to drive the ventilation fan 41 which is an existing facility.

As in the invention of claim 4, claim 1
In the refrigeration apparatus according to any one of (2) and (3), when the heating load increasing unit is configured by a unit that controls the air volume of the indoor fan 33 attached to the use-side heat exchanger 5, it is an existing facility. By controlling the air volume of the indoor fan 33, the indoor heating load can be increased.

According to a fifth aspect of the present invention, in the refrigeration apparatus according to any one of the first to third aspects, the high pressure Ph which is the discharge pressure of the compressor 1 is equal to or higher than a set value Phs. When the heating load increasing means is actuated in such a case, the high pressure Ph becomes equal to the set value Ph.
s or more, the heating load increasing means is actuated (for example, the ventilation fan 41 is driven),
It is possible to prevent a decrease in the capacity of the evaporator 6 due to a decrease in the indoor heating load while preventing an abnormal increase in the high pressure Ph.

As in the invention of claim 6, in the refrigerating apparatus according to any one of claims 1, 2, 3, and 4, a plurality of the use side heat exchangers 5 are provided,
When the number of thermostats among the use-side heat exchangers 5, 5,... Becomes equal to or more than a predetermined number, the heating load increasing means is operated.
················································································································································ Can be prevented.

As in the invention of claim 7, in the refrigeration apparatus according to any one of claims 1, 2, 3, and 4, the difference between the set temperature Ts in the use side heat exchanger 5 and the room temperature Tr. When the heating load increasing means is operated when ΔT becomes smaller than the predetermined value ΔTs, the set temperature Ts and the room temperature Tr in the use side heat exchanger 5 are set.
When the temperature difference ΔT is smaller than the predetermined value ΔTs, the heating load increasing means is actuated (for example, the ventilation fan 41 is started to drive), and the performance of the evaporator 6 due to the decrease in the indoor heating load is reduced. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of a refrigeration apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a control system in the refrigeration apparatus according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing the contents of an indoor heating load increase control in the refrigeration apparatus according to the first embodiment of the present invention.

FIG. 4 is a refrigerant circuit diagram of a refrigeration apparatus according to a second embodiment of the present invention.

FIG. 5 is a flowchart showing the contents of an indoor heating load increase control in a refrigeration apparatus according to a second embodiment of the present invention.

FIG. 6 is a flowchart showing the contents of an indoor heating load increase control in a refrigeration apparatus according to a third embodiment of the present invention.

[Explanation of symbols]

1 is a compressor, 2 is a four-way switching valve, 3 is a heat source side heat exchanger, 4
Is a pressure reducing mechanism (expansion valve), 5 is a use side heat exchanger, 6 is an evaporator, 33 is an indoor fan, 41 is a ventilation fan, 42 is a high pressure detection means (pressure sensor), 43 is a room temperature sensor, and A is an air conditioner. Refrigerant circuit, B is a heat recovery circuit (refrigeration refrigerant circuit),
C is a refrigerant circuit for refrigeration, Ph is a high pressure, Phs is a set value, N is the number of thermostats stopped, Ns is a predetermined number, Ts is an air conditioning set temperature, Tr is room temperature, ΔT is a differential temperature, and ΔTs is a set value.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kazuhide Nomura 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries Inside Kanaoka Plant of Sakai Seisakusho Co., Ltd. (72) Masaaki Takegami 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries Inside the Sakai Seisakusho Kanaoka Plant (72) Inventor Akitoshi Ueno 1304 Kanaokacho, Sakai City, Osaka Daikin Industries Inside the Sakai Seisakusho Kanaoka Plant F-term (reference) 3L060 AA06 CC02 CC16 DD08 EE01

Claims (7)

[Claims] 1. A compressor (1), a four-way switching valve (2),
A heat source side heat exchanger (3) that acts as a condenser during cooling operation and acts as an evaporator during heating operation, a pressure reducing mechanism (4), acts as an evaporator during cooling operation, and acts as a condenser during heating operation And a refrigeration or freezing evaporator (6) connected in parallel with the use-side heat exchanger (5). A heat recovery circuit that circulates the refrigerant from the compressor (1) through the four-way switching valve (2), the use side heat exchanger (5), the pressure reducing mechanism (4), and the evaporator (6). A refrigeration system comprising the configuration (B), wherein a refrigeration system is further provided with a heating load increasing means that acts to increase the indoor heating load. 2. A compressor (1), a four-way switching valve (2),
A heat source side heat exchanger (3) that acts as a condenser during cooling operation and acts as an evaporator during heating operation, a pressure reducing mechanism (4), acts as an evaporator during cooling operation, and acts as a condenser during heating operation And a refrigeration or freezing evaporator (6) connected in parallel with the use-side heat exchanger (5). A heat recovery circuit that circulates the refrigerant from the compressor (1) through the four-way switching valve (2), the use side heat exchanger (5), the pressure reducing mechanism (4), and the evaporator (6). B) The refrigeration system that constitutes B), wherein the indoor heating load is reduced and the required capacity balance between the use side heat exchanger (5) and the evaporator (6) becomes unbalanced. The fact that a heating load increasing means acting to increase the indoor heating load has been added Refrigeration apparatus according to symptoms. 3. The heating load increasing means comprises a ventilation fan (41) for ventilating indoor air and a control means for controlling start / stop of the ventilation fan (41). The refrigeration apparatus according to any one of claims 2 and 3. 4. The heating load increasing means is constituted by means for controlling a flow rate of an indoor fan (33) attached to the use side heat exchanger (5). The refrigeration apparatus according to any one of the preceding claims. 5. The heating load increasing means is activated when a high pressure (Ph), which is a discharge pressure of the compressor (1), becomes equal to or higher than a set value (Phs). The refrigeration apparatus according to claim 1, 2, 3, or 4. 6. A plurality of said use side heat exchangers (5) are provided, and said use side heat exchangers (5), (5).
Wherein the heating load increasing means is activated when the number of thermostats stopped (N) is equal to or greater than a predetermined number (Ns). The refrigeration apparatus according to claim 1. 7. When the temperature difference (ΔT) between the set temperature (Ts) and the room temperature (Tr) in the use side heat exchanger (5) becomes smaller than a predetermined value (ΔTs), the heating load increasing means is activated. 5. The refrigeration apparatus according to claim 1, wherein the refrigeration apparatus is operated.