JPH03260559A - Heat storage type air conditioner and controlling method therefor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a regenerative air conditioner which aims to equalize the power demand by utilizing surplus power such as night power. The failure of trying to equalize heat storage air conditioners that utilize surplus electricity such as nighttime electricity during the summer have been proposed.

Figure 2 shows the configuration of a conventional regenerative air conditioner. 1 is the compression number, 2 is the outdoor heat exchanger 3 is the expansion device, and 4 is the regenerative heat exchanger. These are connected in sequence to transfer the refrigerant. The circuit is configured. Reference numeral 5 denotes an indoor heat exchanger, which is configured to cool the room by circulating the cold storage material in the heat storage grooves 6 with a circulation pump 7.

In this configuration, in the summer, the compressor 1 is driven using nighttime electricity, and the outdoor heat exchanger 2 is used as a condenser.
A cold storage operation is performed using the heat storage heat exchanger 4 as an evaporator (\ The cold storage material (water, etc.) in the heat storage groove 6 is cooled to a temperature (about 5"C) that can be used for air conditioning. Then, during the daytime During cooling operation, the circulation pump 7 is driven to circulate the cooled cold storage material to the indoor heat exchanger, thereby cooling the room. Cooling operation using surplus electricity can also help level out electricity demand.
Although an ice storage type that utilizes latent heat has been proposed to reduce the size of the heat storage groove, the problem that the invention is trying to solve remains.
The temperature of the heat storage material in the heat storage groove must be kept low enough to be used for cooling or high enough to be used for heating, so during cold storage operation the evaporation temperature drops more than during normal cooling operation. Furthermore, during heat storage operation, it was necessary to raise the condensing temperature higher than during normal heating operation, which significantly reduced the efficiency of the refrigeration cycle.Furthermore, there was a large difference between the temperature of the heat storage groove and the ambient temperature, so Means for solving the problem of large heat leakage and very low heat storage efficiency Regenerative air conditioner c1 of the present invention Compression line Four-way valve, regenerative heat exchanger Throttle device Outdoor heat exchanger etc. are connected to form a main refrigerant circuit, and an indoor heat exchanger is connected in parallel with the outdoor heat exchanger to perform cold storage/thermal storage operation by the main refrigerant circuit, and to connect the regenerative heat exchanger and the indoor heat exchanger. In addition, as the heat storage material, a latent heat storage material that changes phase at a temperature higher than the evaporation temperature during cooling operation and lower than the condensation temperature during heating operation is used. It is characterized by

Furthermore, the method for controlling a regenerative air conditioner according to the present invention uses an outdoor heat exchanger and a regenerative heat exchanger to perform cold storage and heat storage operation using surplus electricity such as nighttime electricity. The regenerative air conditioner according to claim 1, which uses an exchanger and performs cooling/heating operation using normal electric power, operates a heat pump cycle using outside air as a heat source in the cold storage/thermal storage operation mode, and stores heat. Storing cold or heat in materials (＼ Cooling/
In the heating operation mode, the heat pump cycle is operated using the heat stored in the heat storage material as a heat source to perform cooling or heating.・
The regenerative air conditioner according to claim 2, which performs compression twice in the heating mode, can improve the coefficient of performance especially when the pressure difference between the high temperature side and the low temperature side is large. Latent heat storage material, which has a temperature higher than the evaporation temperature during cooling operation,
By using a latent heat storage material that undergoes a phase change at a temperature lower than the condensation temperature during heating operation, it is possible to dramatically improve the coefficient of performance during heat storage operation and reduce heat leakage from the heat storage grooves.

Furthermore, the method for controlling a regenerative air conditioner according to claim 3 (i.e., performing efficient cold storage/thermal storage operation using surplus electricity such as nighttime electricity, and cooling/heating operation by low input operation using normal electricity) This will help level out power demand.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

Figure 1 shows the constituent countries of a regenerative air conditioner according to an embodiment of the present invention, where 8 is a compression valve, 9 is a four-way valve, 10 is a regenerative heat exchange @ 11 is a throttle WL, and 12 is an outdoor heat exchanger. 14 and 15 are regenerative heat exchangers 10, even if these are sequentially connected via piping to form the main refrigerant circuit.Also, even if an indoor heat exchanger 13 is connected in parallel with the outdoor heat exchanger 12, 14 and 15 are regenerative heat exchangers 10. and a first on-off valve and a second on-off valve for switching between cold storage/thermal storage operation using the outdoor heat exchanger I2 and cooling/heating operation using the regenerative heat exchanger 10 and the indoor heat exchanger 13. It is. Also, T-18 and t-19 are for the outdoor side blower and the indoor side blower.Inside the heat storage groove 16, there is a heat storage material at a temperature higher than the evaporation temperature during cooling operation and lower than the condensation temperature during heating operation. Phase change thickness For example, paraffin-based latent heat storage material 17 with a melting point of about 20°C
Next, the operation of the regenerative air conditioner configured as described above will be explained. When performing heating operation, first, surplus electric power such as nighttime electric power is used to perform thermal storage operation. In this case, the four-way valve 9 is opened in the direction indicated by the solid line in the figure.
The second on-off valve 15 is closed and the compressor 8 is operated. As a result, the medium temperature and medium pressure refrigerant discharged from the compressor 8 passes through the four-way valve 9 and is guided to the regenerative heat exchanger 10. It exchanges heat with the latent heat storage material 17 sealed inside the heat storage tank 16, condenses and liquefies itself, and the latent heat storage material 16 is heated at 20 degrees.
It stores heat using the latent heat of melting at about C.
After the liquefied refrigerant is depressurized and expanded to the evaporation temperature in the expansion device 11, it is led to the outdoor heat exchanger 12, where it absorbs heat from the outside air sent from the outdoor fan 18, evaporates, and is evaporated into the first opening/closing valve. 14 and into the compressor 8 through the four-way valve 9. After sufficient heat is stored through this heat storage operation, the heating operation is switched to the heating operation. The first on-off valve 14 is closed L The second on-off valve 15 is opened and the compressor 8 is operated.
The high temperature and high pressure refrigerant discharged from the second
The refrigerant is led to the indoor heat exchanger 13 via the on-off valve 15, where it exchanges heat with the indoor air sent by the indoor blower 13, condenses and liquefies, thereby heating the room. After being depressurized and expanded to an intermediate pressure at step 11, it is led to a heat storage heat exchanger 10, where it exchanges heat with the latent heat storage material 17 that is already in a heat storage state, evaporates and vaporizes, and is sucked into the compressor 8 via the four-way valve 9. As shown in the figure, the discharge pressure of the compressor 8 becomes an intermediate pressure during heat storage operation, and the suction pressure of the compressor 8 becomes an intermediate pressure during heating operation. This increases the efficiency of the compressor and increases the amount of refrigerant circulated, allowing a small-capacity compressor to provide sufficient heating capacity.

Next, when performing cooling operation, first perform cold storage operation using surplus electricity such as nighttime electricity. In this case, the four-way valve 9 is set L in the direction shown by the broken line in the figure, the first on-off valve 14 is opened, the second on-off valve 15 is closed, and the compressor 8 is operated. The high-temperature, high-pressure refrigerant passes through the four-way valve 9 and is led to the outdoor heat exchanger 12 via the first on-off valve 14. Here, the outside air sent from the outdoor blower 18 radiates heat, condenses and liquefies, and is decompressed and expanded by the expansion device 11 to an intermediate pressure. Heat storage material 17
The latent heat storage material 16 solidifies at about 20° C. and stores cold by utilizing the latent heat. The vaporized refrigerant is passed through a four-way valve 9 to a compressor 8.
Even if the water is inhaled by the cold storage operation, after sufficient cold storage
When switching to cooling operation, the four-way valve 9 is switched in the direction shown by the solid line in the figure, the first on-off valve 14 is closed, the second on-off valve 15 is opened, and the compressor 8 is operated. The intermediate pressure refrigerant discharged from the compressor 8 passes through the four-way valve 9 and is guided to the regenerative heat exchanger 10, where it exchanges heat with the latent heat storage material 17 that is already in a cold storage state and is condensed and liquefied. After depressurizing and expanding to the evaporation pressure at step 11, the air is guided to the indoor heat exchanger 13, where it exchanges heat with the indoor air sent by the indoor blower 13, evaporates, and cools the room. The refrigerant is supplied through the second on-off valve 15 and the four-way valve 9.
In this way, the suction pressure of the compressor 8 becomes an intermediate pressure during cold storage operation, and the discharge pressure of the compressor 8 becomes an intermediate pressure during cooling operation. The compressor also operates at a very low compression ratio, increasing the efficiency of the compressor, but increasing the amount of refrigerant circulated.Sufficient cooling capacity can be obtained with a small-capacity compressor.

In addition, as the heat storage material, a latent heat storage material that changes phase at a temperature higher than the evaporation temperature during cooling operation and lower than the condensation temperature during heating operation, in the above example at about 20°C, is used.
It is possible to store cold heat at a temperature close to the ambient temperature during both cooling and heating operations, thereby reducing heat intrusion into the heat storage tank and dramatically reducing heat loss of stored cold heat. In the example (20°C), the present invention is not limited to this, but depending on the usage conditions of the heat storage type air conditioner, the evaporation temperature is higher than that during cooling operation, and the temperature is higher than that during heating operation. By employing a latent heat storage material that undergoes a phase change in a temperature range lower than the condensation temperature of the present invention, the efficiency of the system can be further improved. The air conditioner has a relatively simple configuration, and uses surplus electricity such as nighttime electricity to store cold and heat through a heat pump cycle using outside air as the heat source.
The heat pump cycle uses the heat stored in the heat storage material as the heat source, and can perform cooling and heating operations with low power consumption.・Number of compressors divided into two times in heating mode This can improve the coefficient of performance, especially when the pressure difference between the high temperature side and the low temperature side is large.

Mana The heat storage type air conditioner 4 of the present invention By using a latent heat storage material whose phase changes at a temperature higher than the evaporation temperature during cooling operation and lower than the condensation temperature during heating operation as the heat storage material, cooling operation is possible. The same heat storage grooves and heat storage material can be used for both heating and heating operation, and the refrigeration cycle can be operated with a small compression ratio and a very high coefficient of performance in all operating modes. In addition, since it is possible to store cold heat at a temperature close to the ambient temperature during both cooling and heating, there is less heat leakage from the heat storage grooves.
It is an extremely energy-saving system that can dramatically reduce heat loss from cold storage heat.

In addition, the method for controlling a regenerative air conditioner according to the present invention uses an outdoor heat exchanger and a regenerative heat exchanger, and performs efficient cold storage and heat storage operation using surplus electricity such as nighttime electricity. It uses a thermal storage heat exchanger to perform cooling and heating operations with low input operation using normal electricity.It has practical effects such as reducing running costs and equalizing electricity demand at the same time. It's something to demonstrate

[Brief explanation of drawings]

Fig. 1 shows the configuration of a regenerative air conditioner according to an embodiment of the present invention, and Fig. 2 shows the constituent countries of a conventional regenerative air conditioner. io... Regenerative heat exchanger 11... Squeezing device 12... Outdoor heat exchanger 13... Indoor heat exchanger 16... Heat storage unit 17
...Latent heat storage material.

Claims (3)

[Claims] (1) A compressor, a four-way valve, a regenerative heat exchanger, a throttling device, an outdoor heat exchanger, etc. are connected to form a main refrigerant circuit, and an indoor heat exchanger is connected in parallel with the outdoor heat exchanger. . A regenerative air conditioner, characterized in that the main refrigerant circuit performs cold storage/thermal storage operation and cooling/heating operation using a regenerative heat exchanger and an indoor heat exchanger are switched. (2) The heat storage type air conditioner according to claim 1, characterized in that the heat storage material is a latent heat storage material that changes phase at a temperature higher than the evaporation temperature during cooling operation and lower than the condensation temperature during heating operation. Machine. (3) Use an outdoor heat exchanger and a regenerative heat exchanger to perform cold storage and heat storage operation using surplus electricity such as nighttime electricity, and use an indoor heat exchanger and a regenerative heat exchanger to perform cold storage and thermal storage operation using regular electricity. cooling·
A method of controlling a regenerative air conditioner that performs heating operation.