JPH0327257Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an air conditioner, and is particularly useful in cases where cooling loads and heating loads coexist throughout the year. The present invention relates to a heat recovery type multi-air conditioner that can be used as a heat source for other rooms that require heating at the same time, and has the function of cooling each room in the summer.

Conventionally, this type of air conditioner has a configuration that includes a cooling-only air conditioner that enables cooling operation throughout the year, and an air-cooled heat pump air conditioner that performs cooling in the summer and heating in the winter. In cases where cooling load and heating load coexist through the air, a cooling-only air conditioner that enables year-round cooling operation is expensive because it requires a high-pressure pressure control device to enable normal cooling operation even in winter. , which can also cause trouble.

(2) In air-cooled heat pump air conditioners, cold drafts occur due to winter defrosting operation, causing discomfort.

(3) Each air conditioner must be operated to handle the coexisting cooling load and heating load, which increases running costs.

(4) It will be a dual facility, and a lot of space will be required to install the air conditioner.

There were many problems such as.

The present invention was developed to solve these drawbacks, and it connects one or more cooling indoor units and cooling outdoor units installed in a room with a cooling load throughout the year using refrigerant piping. The air-cooled heat pump air conditioner consists of an indoor unit for cooling and heating installed in a room with a cooling load and a heating load, and an outdoor unit connected by refrigerant piping.
The one or more cooling-only indoor units and the indoor unit are connected by refrigerant piping via a solenoid valve that is opened during heat recovery, and the one or more cooling-only indoor units are operated for cooling. It is characterized by the ability to perform heat recovery operation that uses the generated waste heat to perform cooling and heating at the same time. Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Figures 1 to 3 are block diagrams showing one embodiment of the present invention, and Figure 1 shows how the exhaust heat generated by cooling the indoor unit is discharged from the outdoor unit in the summer. At the same time, Figure 2 shows a state in which waste heat generated by the cooling operation of the indoor unit exclusively for cooling is discharged from the outdoor unit exclusively for cooling. Figure 3 shows a state where the indoor unit is in heating mode and the cooling indoor unit is in cooling mode, and exhaust heat is discharged from the cooling outdoor unit. FIG. 6 is a diagram illustrating a state in which the indoor unit performs heating operation using the exhaust heat as a heat source at the same time as cooling operation.

In these figures, a is an indoor unit, b is an outdoor unit, c is an indoor unit exclusively for cooling, and d is an outdoor unit exclusively for cooling. A cooling-only air conditioner is composed of the cooling-only outdoor unit d and the cooling-only outdoor unit d. In addition, in this embodiment, the cooling-only indoor unit c
shows the case of two units.

In indoor unit a, 1 is a compressor, 2 is a circuit switching valve, 3 is an indoor air heat exchanger, 4 is an expansion valve,
5, 14, 15 are check valves, 6 is a dryer filter, 7 is a liquid receiver, 8 is a suction accumulator, 9 is a fan, 10 is a stop valve, 11, 12, 1
3 is a solenoid valve, which is piped and arranged as shown in the figure. Reference numerals 16 and 16' denote refrigerant pipes connecting the indoor unit a and the outdoor unit b.

In outdoor unit b, 17 is an expansion valve, 18
1 is a check valve, 19 is an outdoor air exchanger, and 20 is a fan, which are piped and arranged as shown in the figure.

In the cooling-only indoor unit c, 21 is a capillary reach tube, 22 is a heat recovery air heat exchanger,
23 is a fan, and 24, 24', 25, and 25' are electromagnetic valves, which are piped and arranged as shown in the figure. Reference numerals 26 and 26' designate refrigerant pipes connecting the indoor unit a and the cooling indoor unit c.

In the cooling outdoor unit d, 27 is a compressor, 28 is an outdoor air heat exchanger, 29 is a dryer filter, 30 is a suction accumulator, 31
is a fan, which is piped and arranged as shown in the figure. Reference numerals 32 and 32' designate refrigerant pipes that connect the cooling-only indoor unit c and the cooling-only outdoor unit d.

Next, the operation will be explained.

During cooling operation in the summer, as shown in Figure 1, indoor unit a and outdoor unit b are
In addition, the cooling-only indoor unit c and the cooling-only outdoor unit d for heat recovery are each operated in pairs.

In the indoor unit a, the high-pressure refrigerant gas discharged from the compressor 1 passes through the circuit switching valve 2, the stop valve 10, the refrigerant pipe 16, and flows into the outdoor air heat exchanger 19 provided in the outdoor unit b. It is cooled and condensed by the outdoor air blown by the fan 20. The condensed high-pressure liquid refrigerant is passed through the check valve 18
The refrigerant passes through the refrigerant pipe 16', flows from the open electromagnetic valve 11 of the indoor unit a to the stop valve 10, flows into the liquid receiver 7, passes through the dryer filter 6, is expanded by the expansion valve 4, and becomes indoor air heat. It flows into the exchanger 3, where it is heated and evaporated by room air ventilated by the fan 9. As a result, indoor unit a performs cooling operation. The evaporated low pressure refrigerant gas is
It returns to the compressor 1 via the circuit switching valve 2 and the suction accumulator 8.

On the other hand, in the cooling outdoor unit d, the high-pressure refrigerant gas discharged from the compressor 27 flows into the outdoor air heat exchanger 28, where it is cooled and condensed by the outdoor air blown by the fan 31. The condensed high-pressure liquid refrigerant passes through the dryer filter 29, the refrigerant pipe 32', and the solenoid valve 24' provided in each of the two cooling indoor units c.
It expands in the capillary reach tube 21, and is heated and evaporated in the heat recovery air heat exchanger 22 by indoor air blown by the fan 23. As a result, the cooling-only indoor unit c performs a cooling operation. The evaporated low-pressure cooling gas passes through the solenoid valve 24 to the refrigerant pipe 32.
, and returns to the compressor 27 via the suction accumulator 30 in the cooling outdoor unit d.

During heating operation by indoor unit a in winter, as shown in FIG. It is cooled and condensed by the indoor air that is ventilated. This results in
Indoor unit a performs heating operation. The condensed high-pressure liquid refrigerant flows into the liquid receiver 7 through the check valve 5, passes through the opened solenoid valve 11, and passes through the refrigerant pipe 16'.
The air is expanded by the expansion valve 17 provided in the outdoor unit b, flows into the outdoor air heat exchanger 19, and is heated by the fan 20.
It is heated and evaporated by the outdoor air blown by. Therefore, in this case, the heat exchanger 19 acts as an evaporator using the outside air as a heat source. The evaporated low-pressure refrigerant gas passes through the refrigerant pipe 16, passes through the stop valve 10 in the indoor unit a, passes through the circuit switching valve 2, passes through the suction accumulator 8, and returns to the compressor 1. At this time, the cooling-only indoor unit c and the cooling-only outdoor unit d can be operated for cooling by the same operation as described in the explanation of FIG.

During heat recovery operation in winter, as shown in Figure 3, in indoor unit a, compressor 1
The high-pressure refrigerant gas released from the refrigerant gas flows into the indoor air heat exchanger 3 through the circuit switching valve 2, and is cooled and condensed by the indoor air ventilated by the fan 9. As a result, indoor unit a performs heating operation. The condensed high-pressure liquid refrigerant flows into the liquid receiver 7 through the check valve 5, passes through the opened electromagnetic valves 12 and 13, and passes through the refrigerant pipe 26, which is installed in each of the two indoor cooling-only units c. The heat is expanded in the capillary reach tube 21 through the electromagnetic valve 25', and the heat is transferred to the heat recovery air heat exchanger 2.
2, and is heated and evaporated by the indoor air ventilated by the fan 23. As a result, the cooling-only indoor unit c performs a cooling operation. The evaporated low-pressure refrigerant gas passes through the solenoid valve 25, the refrigerant pipe 26', and the check valve 14 provided in the indoor unit a.
15, and returns to the compressor 1 via the circuit switching valve 2 and the suction accumulator 8. Therefore, in this case, the exhaust heat of the cooling-only indoor unit c is used to perform the heating operation of the indoor unit a.

In this embodiment, a cooling-only indoor unit c
shows the case of two devices, but it is not limited to this, and even if there is only one device, two devices can be used.
Even if the number of units is more than one, cooling operation and heating operation can be performed by the same operation.

As explained above, the present invention consists of an air-cooled heat pump air conditioner consisting of a pair of indoor units and an outdoor unit for both cooling and heating, an outdoor unit for cooling only, and one or more (required number of) indoor units for cooling only. (1) If cooling loads and heating loads coexist throughout the year, the combined operation of the cooling-only indoor unit and the indoor unit will provide cooling or heating at the same time. This makes it possible to significantly reduce running costs. Furthermore, the defrost operation for defrosting the outdoor unit, which was a problem in the conventional system, is reduced, and the discomfort caused by cold draft can be eliminated.

(2) By adding solenoid valves, check valves, and heat recovery indoor units to conventional air conditioners, heat recovery type air conditioners can be configured, making it possible to install communication equipment rooms and computer rooms that generate a high amount of heat. It is very effective as an air conditioner in buildings where cooling and heating are required at the same time in the winter.

(3) If the distance between cooling indoor unit c and indoor unit a is long, solenoid valve 13 and check valve 1
5 within the cooling-only indoor unit c, the cost of refrigerant piping work can be reduced. Additionally, the number of piping connections is reduced, which has the effect of reducing problems such as gas leaks. Therefore, it is very effective in cases where cooling and heating are required at the same time even in winter, such as in buildings with communication equipment rooms or computer rooms that generate a high amount of heat.

[Brief explanation of the drawing]

Figures 1 to 3 are block diagrams showing one embodiment of the present invention, and Figure 1 shows how the exhaust heat generated by cooling the indoor unit a is discharged from the outdoor unit b in the summer. At the same time, FIG. 2 is a diagram showing a state in which exhaust heat generated by operating the cooling-only indoor unit c is discharged from the cooling-only outdoor unit d. Figure 3 is a diagram showing a state in which the indoor unit a performs heating operation using outside air as a heat source, and at the same time exhaust heat generated by the cooling indoor unit c performing cooling operation is discharged from the cooling outdoor unit d. , is a diagram illustrating a state in which the cooling-only indoor unit c is in a cooling operation, and at the same time, the indoor unit a is in a heating operation using its exhaust heat as a heat source. a: indoor unit, b: outdoor unit, c: indoor unit for cooling only, d: outdoor unit for cooling only. 1, 27: Compressor, 2: Circuit switching valve, 3, 1
9, 22, 28: heat exchanger, 4, 17: expansion valve,
5, 14, 15, 18: Check valve, 6, 29: Dryer filter, 7: Liquid receiver, 8, 30: Suction accumulator, 9, 20, 23, 31: Fan, 10: Stop valve, 11 ,12,13,24,2
4'25, 25': Solenoid valve, 16, 16', 26,
26', 32, 32': Refrigerant piping, 21: Capillary reach tube.

Claims (1)

[Scope of Claim for Utility Model Registration] In an air conditioner for multiple rooms in a building that has a room with a cooling load throughout the year and a room with a cooling load and a heating load, the air conditioner is equipped with a heat exchanger and a fan and has a cooling load throughout the year. A cooling-only air conditioner is constructed by connecting one or more cooling-only indoor units installed in a room with a compressor to an air-conditioning outdoor unit equipped with a compressor, a heat exchanger, and a fan through refrigerant piping; An indoor unit is installed in a room with a cooling load and a heating load, and an outdoor unit is equipped with a heat exchanger and a fan. an air-cooled heat pump air conditioner in which the one or more cooling indoor units and the indoor unit are connected via a refrigerant pipe via a solenoid valve that is opened during heat recovery; A heat recovery type multi-air conditioner characterized by heat recovery operation using one or more indoor units dedicated to cooling.