JPH0719664A - Heat pump - Google Patents

Abstract

PURPOSE:To reduce the cost of a temperature regulating heat exchanger while simultaneously heating and cooling. CONSTITUTION:A heat source side heat exchanger 3 for absorbing or dissipating heat from or to a heat source and two temperature regulating heat exchangers 4 for regulating the temperatures of objects to be temperature regulated are provided in a refrigerant circuit 6. A heat pump in which one of the exchangers 4 is used for heating temperature regulation to be operated as a condenser, and the other is used for cooling temperature regulation to be operated as an evaporator is provided. The two exchangers 4 are formed of heat exchanging units 4A, 4B having different heat exchanging capacities, and the large capacity exchanger 4A of the exchangers 4A, 4B is used for heating temperature regulation to be operated as a condenser. The circuit 6 is switched to a heating main body operation in which the small capacity heat exchanger 4B is used for cooling temperature regulation to be operated as an evaporator and a cooling main body operation in which the large capacity heat exchanger 4A is used for heating temperature regulation to be operated as a condenser and the exchanger 4B is used for heating temperature regulation to be operated as a condenser.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump device used for air conditioning, and more specifically, a heat source side heat exchanger for absorbing or radiating heat to a heat source, and two temperature control heat exchanges for controlling the temperature of an object to be temperature controlled. Equipped in the refrigerant circuit, one of these heat exchangers for temperature control to act as a condenser for heating temperature control,
In addition, the present invention relates to the other one for causing the evaporator to act as a cooling temperature control.

[0002]

2. Description of the Related Art In a heat pump device of this type, one of the heat exchangers for temperature adjustment acts as a condenser for heating temperature adjustment, and the other acts as an evaporator for cooling temperature adjustment, so that heating and cooling can be performed simultaneously. In addition to being able to perform the heating alone operation and the cooling alone operation, there is an advantage that an operation that requires both heating and cooling, such as simultaneous cooling and heating operation, and dehumidification operation by cooling dehumidification / reheating can be performed.

As a conventional heat pump device having such an advantage, one of the two temperature control heat exchangers is a dedicated heat exchanger for heating and temperature control, and the other is a dedicated heat exchanger for cooling temperature control. Are known. That is, the conventional heat pump device is always configured to perform heating by one of the temperature control heat exchangers and perform cooling by the other temperature control heat exchanger.

[0004]

However, in the case of the above-mentioned conventional technique, the two heat exchangers for temperature adjustment are dedicated for heating and cooling, so that the heat exchanger for temperature adjustment dedicated to heating has maximum heating. Heat exchange capacity (condenser capacity) commensurate with load
On the other hand, a heat exchanger for temperature control dedicated to cooling needs heat exchange capacity (evaporator capacity) commensurate with the maximum cooling load, and both heat exchangers for temperature control are large and costly. Was becoming.

An object of the present invention is to reduce the cost required for a temperature control heat exchanger while simultaneously performing heating and cooling.

[0006]

A feature of the heat pump device according to the present invention is that the two heat exchangers for temperature control described above are configured to have heat exchange capacities different from each other. Heating main operation in which the capacity heat exchanger acts as a condenser for heating temperature adjustment and the small capacity heat exchanger acts as an evaporator in cooling temperature adjustment, and the large capacity heat exchanger acts as an evaporator in cooling temperature adjustment. In addition, the refrigerant circuit can be switched to a cooling-main operation in which the small capacity heat exchanger is used as a heating temperature control to act as a condenser.

[0007]

For example, the simultaneous heating and cooling operation is carried out when performing local cooling in the winter when heating is required or when performing local heating in the summer when cooling is required.
In the former case, the heating load may be the maximum load, but the cooling load may be maintained at a small load, and in the latter case, the cooling load may be the maximum load, but the heating load is a small load. Maintained at. Further, in the dehumidification by cooling dehumidification / reheating, the cooling load is large, but the heating load for reheating is small. As described above, when the usage pattern of the heat pump device is seen, heating and cooling are often required at the same time, but the heat pump device is not required to have the maximum heating capacity and the maximum cooling capacity at the same time.

Focusing on the above points, two heat exchangers for high temperature control, a large capacity heat exchanger and a small capacity heat exchanger, are provided,
By switching the refrigerant circuit, the large capacity heat exchanger is used for heating temperature control, and the small capacity heat exchanger is used for cooling temperature control.On the contrary, the large capacity heat exchanger is used for cooling temperature control. In addition, since it is configured to selectively show the cooling main operation in which the small capacity heat exchanger is used for heating temperature control, the heating load is large in the heating / cooling operation such as in winter, but the cooling load is small. In this case, the heating-main operation is switched, and when the cooling load is large, such as in the summer, but when the heating load is small, the cooling-main operation is switched to perform the appropriate heating / cooling operation.

[0009]

According to the present invention, therefore, one of the two heat exchangers for temperature control need only have a small capacity, while the other heat exchanger for heating and cooling can be performed at the same time, and the other one is equivalent to the conventional one. Since the capacity of the heat exchanger is sufficient, the cost required for the temperature control heat exchanger can be reduced.

[0010]

EXAMPLE As shown in FIGS. 1 to 4, air conditioning equipment uses a heat pump device 1 for heating and cooling brine such as water, and an air conditioner for each air conditioning target area A using the brine heated and cooled by the heat pump device 1. And a fan coil unit (hereinafter referred to as FCU) 2 for performing.

The heat pump device 1 includes a heat source side heat exchanger 3 which uses outside air as a heat source to absorb or radiate heat from the heat source, and two temperature control heat exchangers 4 which control the temperature of the brine which is a temperature control object. The compressor 5 and the expansion valve device are installed in the refrigerant circuit 6 and configured. 7 is an accumulator. More specifically, one of the temperature control heat exchangers 4 is a large capacity heat exchanger 4A having a large heat exchange capacity, and the other is a small capacity heat exchanger having a small heat exchange capacity. It is configured in the exchanger 4B. Then, in the high-capacity heat exchanger 4A, the heated or cooled brine is supplied to the first distribution path 8
A first supply path 9A with a supply pump PA for supplying A,
The first return path 11A for receiving the brine from the first collecting path 10A is connected, and the small capacity heat exchanger 4B also has a supply pump PB for supplying the heated or cooled brine to the second distribution path 8B. Second supply path 9B and second return path 11B for receiving brine from the second collecting path 10B.
And are connected.

The expansion valve device includes a heat source side expansion valve 12 for expanding the condensed refrigerant supplied to the heat source side heat exchanger 3 to cause the heat source side heat exchanger 3 to act as an evaporator, and a large capacity heat exchanger 4A.
The condensed refrigerant supplied to and expanded to the large capacity heat exchanger 4A
And a second expansion valve 12B for expanding the condensed refrigerant supplied to the small capacity heat exchanger 4B so that the small capacity heat exchanger 4B functions as an evaporator. The refrigerant circuit 6 is configured such that the heating operation, the cooling operation, the heating main operation, and the cooling main operation can be selectively exposed by switching the flow path by the valve V.

The heating operation is performed by the compressor 5 as shown in FIG.
The compressed refrigerant from the above is branched and supplied to the large capacity heat exchanger 4A and the small capacity heat exchanger 4B to cause both of them to act as a condenser, and the condensed refrigerant from both of them is supplied to the heat source side expansion valve 12 to be expanded. After that, the heat source side heat exchanger 3 is supplied to cause the heat source side heat exchanger 3 to act as an evaporator, and the evaporative refrigerant from the heat source side heat exchanger 3 is supplied to the compressor 5.

The cooling operation is performed by the compressor 5 as shown in FIG.
The compressed refrigerant from the heat source side heat exchanger 3 is supplied to the heat source side heat exchanger 3 to condense the condensed refrigerant from the heat source side heat exchanger 3 into the first expansion valve 12A and the second expansion valve 12B.
Is supplied to the large capacity heat exchanger 4A and the small capacity heat exchanger 4B to cause them to act as an evaporator, and the evaporated refrigerant from both of them is supplied to the compressor 5. .

In the heating-main operation, as shown in FIG. 3, the compressed refrigerant from the compressor 5 is supplied to the large capacity heat exchanger 4A so that the large capacity heat exchanger 4A acts as a condenser, and the large capacity heat exchanger 4A is operated. The condensed refrigerant from the exchanger 4A is supplied to the heat source side expansion valve 12 and the second
Operation for supplying the heat source side heat exchanger 3 and the small capacity heat exchanger 4B by branching and supplying them to the expansion valve 12B to cause them to act as an evaporator and supplying the evaporated refrigerant from both to the compressor 5. Is.

In the cooling main operation, as shown in FIG. 4, the compressed refrigerant from the compressor 5 is branched and supplied to the heat source side heat exchanger 3 and the small capacity heat exchanger 4B so that both of them act as a condenser. The condensed refrigerant from both of them is joined and supplied to the first expansion valve 12A to be expanded, and then supplied to the large capacity heat exchanger 4A to cause the large capacity heat exchanger 4A to act as an evaporator, and the large capacity heat exchanger 4
This is an operation in which the evaporated refrigerant from A is supplied to the compressor 5.

The FCU 2 includes a fan F that blows air to the air conditioning target area A, a first heat exchanger 13A that heats or cools the blown air by exchanging heat with the heated or cooled brine, and the heated or cooled brine. The second heat exchanger 13B heats or cools the blown air by exchanging heat. The first heat exchanger 13A is connected to the first distribution passage 8A via a first outward passage 14A, and the first collecting passage 10 via a first return passage 15A.
It connects to A and heats or cools the blast with brine from the large capacity heat exchanger 4A. The second heat exchanger 1
3B is connected to the second distribution passage 8B via the second outward passage 14B and is connected to the second collecting passage 10B via the second return passage 15B, and heats the blast with brine from the small capacity heat exchanger 4B. Alternatively, it is cooled. Then, the first heat exchanger 13A is provided in each of the first outward path 14A and the second outward path 14B.
Further, a first adjusting valve 16A and a second adjusting valve 16B for adjusting the amount of brine supplied to the second heat exchanger 13B so as to adjust the heating or cooling capacity of the blown air are interposed.

Therefore, in this air conditioning equipment, as shown in FIG. 1, by switching the heat pump device 1 to the heating operation and using the first heat exchanger 13A, heating can be performed and the heating load is large. By using the second heat exchanger 13B also for the air conditioning target area A, heating corresponding to the heating load can be performed, and as shown in FIG. 2, the heat pump device 1 is switched to the cooling operation, and By using the first heat exchanger 13A, the second heat exchanger 1 is provided for the air-conditioning target area A that can perform cooling and has a large cooling load.
By also using 3B, it is possible to perform cooling corresponding to the cooling load. Moreover, as shown in FIG. 3, the heat pump device 1 is switched to the heating main operation, the first heat exchanger 13A is used in the air conditioning target area A requiring heating, and the second heat exchanger is used in the air conditioning target area A requiring cooling. By using the exchanger 13B, the cooling and heating simultaneous air conditioning when the heating load is larger than the cooling load can be performed, and as shown in FIG. 4, the heat pump device 1 is switched to the cooling main operation, and the first heat exchanger 13A and the first heat exchanger 13A By using the two heat exchangers 13B together, the first
Dehumidification can be performed by cooling the blast by the heat exchanger 13A and reheating by heating the blast by the second heat exchanger 13B. Although not shown, the heat pump device 1 is switched to the cooling main operation, the first heat exchanger 13A is used in the air conditioning target area A requiring cooling, and the second heat exchanger 13A is used in the air conditioning target area A requiring heating.
By using the heat exchanger 13B, cooling / heating simultaneous air conditioning can be performed when the cooling load is larger than the heating load.

[Other Embodiment] In the above embodiment, the brine is heated or cooled by the heat exchanger 4 for temperature control, and the brine is heated to the F temperature.
Although the air conditioning target area A is configured to be air-conditioned by supplying the air to the CU2, the temperature control heat exchanger 4 heats or cools the air, and supplies the air to the air conditioning target area 2 May be configured to be air-conditioned.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a heating state.

FIG. 2 is a circuit diagram showing a cooling state.

FIG. 3 is a circuit diagram showing a heating / cooling state.

FIG. 4 is a circuit diagram showing a dehumidifying state.

[Explanation of symbols]

 3 Heat source side heat exchanger 4 Temperature control heat exchanger 6 Refrigerant circuit 4A Large capacity heat exchanger 4B Small capacity heat exchanger

Claims (1)

[Claims] 1. A heat source side heat exchanger (3) for absorbing or radiating heat to a heat source, and two temperature control heat exchangers (4) for controlling the temperature of an object to be temperature controlled are provided in a refrigerant circuit (6), A heat pump device in which one of these temperature control heat exchangers (4) acts as a condenser for heating temperature control and the other acts as an evaporator for cooling temperature control, wherein the two temperature control heat exchangers (4) are different in heat exchange capacity (4
A) and (4B), and the heat exchanger for temperature control (4
Among the heat exchangers (A) and (4B), the high-capacity heat exchanger (4A) acts as a condenser for heating temperature control, and the low-capacity heat exchanger (4
Heating main operation in which B) acts as an evaporator for cooling temperature adjustment, and the large capacity heat exchanger (4A) acts as an evaporator in cooling temperature adjustment, and the small capacity heat exchanger (4B) serves as heating temperature adjustment. A heat pump device configured such that the refrigerant circuit (6) can be switched to a cooling-main operation in which the condenser acts as the above.