JPH11118265A - Heat storage unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform air conditioning by performing heat-storing operation, at the same time, by mounting an evaporation pressure-adjusting device to a heat storage unit, and hence by adjusting the evaporation pressure of an indoor machine in a heat-storage air conditioner. SOLUTION: The heat storage unit of a heat-storage air conditioner has an outdoor unit with a compressor 1 and a condenser 2, a heat-storage unit with a pressure-reducing device 3, switching valves 8a, 8b, and 8c, and a heat- storage heat exchanger 4, an indoor unit with a pressure-reducing device 5, and an evaporator 6, and piping for connecting them. In the unit, an evaporation pressure-adjusting device 7 is provided between a position of the gas piping of the indoor unit side and a position where the gas piping branches so that one of the gas piping is connected to the heat-storage heat exchanger 4 and the other are connected to the outdoor and indoor units, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner such as a package air conditioner or a home air conditioner for performing air conditioning by heat storage.

[0002]

2. Description of the Related Art In a conventional regenerative air conditioner, a compressor of an outdoor unit is operated to use an outdoor heat exchanger as a condenser and a heat storage heat exchanger as a condenser to store heat in a heat storage medium of a heat storage unit. At that time, if the air conditioning is to be performed simultaneously in the indoor unit, the appropriate evaporation pressure is different between the cooling air conditioning and the heat storage, so that the indoor unit evaporator freezes at the evaporation pressure in the heat storage operation. By the way, JP-A-6
A technique has been proposed in which a desired refrigerating temperature and refrigerating temperature can be obtained by providing a constant pressure difference valve as a pressure reducing device between a refrigerating evaporator and a refrigerating evaporator as shown in 2-17577.

[0003] In the above technology, the cooling evaporator and the freezing evaporator are arranged in series, so that the amount of cooling in the freezing evaporator depends on the amount of cooling in the cooling evaporator.

[0004]

SUMMARY OF THE INVENTION In a regenerative air conditioner,
As one method for simultaneously performing the heat storage of the heat storage unit in the heat storage medium and the cooling air conditioning in the indoor unit, there is a method of connecting the heat storage heat exchanger and the indoor heat exchanger in series and using both as an evaporator. However, in that method, the total amount of cooling is the sum of the amount of cooling in the heat storage heat exchanger and the amount of cooling in the indoor heat exchanger. Depending on the cooling capacity of the indoor heat exchanger, it may be a heating area of the refrigerant during the evaporation process in the indoor heat exchanger, and a sufficient cooling amount may not be obtained.

[0005] In the present invention, an evaporating pressure adjusting device is installed in the heat storage unit to adjust the evaporating pressure of the evaporator of the indoor unit, thereby enabling cooling operation and cooling air conditioning simultaneously. Also, in the present invention, heating and air conditioning can be performed by connecting a switching valve with a pipe in parallel with the evaporation pressure adjusting device and using the heat exchanger of the indoor unit as a condenser and the heat exchanger of the outdoor unit as an evaporator. .

[0006]

If the heat storage operation and the cooling air conditioning are to be performed simultaneously, in the heat storage type air conditioner, since the proper evaporation pressure differs between the cooling air conditioning and the heat storage, the heat storage unit is connected to the heat storage heat exchanger. An evaporating pressure controller is installed in the middle of the gas pipe on the indoor unit side from the branch where one of the gas pipes is connected to the outdoor unit and the other is connected to the indoor unit, and the evaporation pressure of the evaporator of the indoor unit is adjusted. This enables cooling and air conditioning at the same time as the heat storage operation.

[0007] A switching valve is connected in parallel with the evaporating pressure control device by piping, and a refrigerant flows through the switching valve to use the heat exchanger of the indoor unit as a condenser and the heat exchanger of the outdoor unit as an evaporator. This enables heating and air conditioning.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on an embodiment shown in FIG. An outdoor unit including the compressor 1, the condenser 2, and the decompression device 3, a heat storage unit including the switching valves 8a, 8b, 8c, a heat storage heat exchanger 4, a decompression device 5, and an indoor unit including the evaporator 6, and In the heat storage unit of the heat storage air conditioner, which is constituted by connecting pipes, one of the gas pipes connected to the heat storage heat exchanger 4 is connected to the outdoor unit, and the other is connected to the indoor unit. An evaporation pressure adjusting device 7 is installed in the middle of the gas pipe.

According to the present invention, when the heat storage operation is performed,
The refrigerant discharged from the compressor 1 is supplied to the condenser 2 of the outdoor unit.
And the pressure is reduced by the pressure reducing device 5 of the heat storage unit.
When the heat storage heat exchanger 4 evaporates, heat is stored by cooling the heat storage medium 9, and is sucked into the compressor 1. At that time, the switching valves 8a and 8c are in a closed state, and the switching valve 8b is in an open state.

In the case where an attempt is made to perform cooling air conditioning in the indoor unit simultaneously with the heat storage operation during the heat storage operation, the switching valve 8
c is in a closed state, and the switching valves 8a and 8b are in an open state. The refrigerant that has exchanged heat in the condenser 2 of the outdoor unit is depressurized by the pressure reducing valve 3 of the heat storage unit, evaporates and the heat storage medium 9 At the same time as the heat is stored in the indoor unit through the switching valve 8, the pressure is reduced by the pressure reducing device (5) in the indoor unit and the evaporation pressure of the indoor unit is controlled by the evaporation pressure adjusting device (7) so as not to become 0.4 MPa or less. Is adjusted and heat is exchanged in the evaporator (6) to perform cooling air conditioning. The evaporating pressure adjusting device (7) prevents the evaporating pressure from falling below a predetermined pressure, thereby preventing the evaporator (6) of the indoor unit from freezing. When performing cooling air-conditioning using the stored heat, the switching valves (8a, 8b) are closed and the switching valves (8, 8b) are closed.
c) is opened so that the heat storage heat exchanger (4) and the evaporator (6) of the indoor unit are connected in series by piping, and the condenser (2) of the outdoor unit.
The refrigerant that has been heat-exchanged in step (1) is supercooled by exchanging heat with the heat storage medium (9) stored in the heat storage heat exchanger (4).
In the indoor unit, the pressure is reduced by the pressure reducing device (5) through the switching valve (8a), heat is exchanged in the evaporator (6) in the indoor unit to perform cooling air conditioning, and the compressor (1) passes through the evaporation pressure adjusting device (7). ). As shown in FIG. 2, during heating and air conditioning, the switching valves (8b, 8c) are closed and the switching valve (8a) is open, and the refrigerant discharged from the compressor is supplied to the four-way valve disposed in the outdoor unit. The refrigerant flow is switched by (10), the switching valve (8d) connected in parallel with the evaporating pressure regulator (7) through the pipe of the heat storage unit is opened, and heat is exchanged in the indoor unit by the condenser (6a). (8
Through a), heat is exchanged in the evaporator of the outdoor unit, and the heat is sucked into the compressor. As described above, by providing the switching valve (8d) in parallel with the evaporating pressure adjusting device (7), the heating operation can be performed.

As another embodiment of the present invention, an outdoor unit and a pressure reducing device provided with a compressor and a condenser, a switching valve, a heat storage unit and a pressure reducing device provided with a heat storage heat exchanger, an indoor unit provided with an evaporator, and In the heat storage unit of the heat storage type air conditioner, which is composed of pipes connecting these, one side of the gas pipe connected to the heat storage heat exchanger is connected to the outdoor unit, and the other side is branched to the indoor unit side from the point branched to connect to the indoor unit. A regenerative air conditioner characterized by having an evaporating pressure regulator installed in the middle of the gas pipe.

Further, as another embodiment, a regenerative air conditioner characterized by connecting a switching valve by piping in parallel with the evaporation pressure adjusting device can be constituted.

[0013]

Since the present invention is configured as described above, if the air conditioning is to be performed in the indoor unit simultaneously with the heat storage operation, the proper air pressure is different between the cooling air conditioning and the heat storage in the heat storage type air conditioner. Therefore, the evaporating pressure is adjusted by the evaporating pressure adjusting device (7) of the heat storage unit, and heat is exchanged by the evaporator (6) of the indoor unit to perform cooling air conditioning. The evaporating pressure adjusting device (7) keeps the evaporating pressure from falling below a predetermined pressure, thereby preventing freezing of the evaporator (6) of the indoor unit.

[Brief description of the drawings]

FIG. 1 is a thermal storage type air conditioner in which an evaporation pressure adjusting device is installed in a thermal storage unit.

FIG. 2 shows a regenerative air conditioner in which a switching valve is connected to a regenerative air conditioner in parallel with an evaporating pressure regulator by piping.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... Outdoor unit condenser, 3 ... Heat storage unit decompression device, 4 ... Heat storage heat exchanger, 5 ... Indoor unit decompression device, 6 ... Indoor unit evaporator, 7 ... Evaporation pressure control device, 8a, 8b , 8c, 8d ... switching valve.

Claims (1)

[Claims] 1. A unit having a function of storing heat,
The heat storage unit is characterized in that one of the gas pipes connected to the heat storage heat exchanger is provided with an evaporating pressure adjusting device in the middle of the gas pipe on the indoor unit side where the other branch is connected to the outdoor unit and the other is connected to the indoor unit. Heat storage unit.