Patent ID: 11965680
Assignee: NIHON ITOMIC CO., LTD.
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 19:
20. A method for controlling a heat pump in which a compressor, a gas cooler, a refrigerant heat exchanger, a refrigerant expansion valve, and an evaporator are connected to configure a refrigerant circulation circuit, the heat pump having a buffer tank, one end of which is connected to the high-pressure side of the refrigerant expansion valve and arranged to store a refrigerant, and a first refrigerant pipe, one end of which is connected to the high-pressure side of the compressor and the other end of which is connected to the downstream side of the evaporator and arranged to exchange heat with the buffer tank, and a second refrigerant pipe in which one end is connected to the high-pressure side of the refrigerant expansion valve and the other end is connected to the downstream side of the evaporator and arranged to exchange heat with the buffer tank,
wherein the first refrigerant pipe includes a first control valve arranged between the high-pressure side of the compressor and the buffer tank to control the opening and closing of the first refrigerant pipe, and the second refrigerant pipe includes a second control valve arranged between the high-pressure side of the refrigerant expansion valve and the buffer tank to control opening and closing of the second refrigerant, the method comprising:
opening the second control valve in response to the difference between the refrigerant introduction temperature on the introduction side of the compressor and the evaporation temperature on the evaporators being smaller than a predetermined value; and
opening the first control valve in response to the difference between the refrigerant introduction temperature on the introduction side of the compressor and the evaporation temperature on the evaporator being larger than a predetermined value.