JPWO2022162776A5 - - Google Patents

Claims (9)

a compressor, an outdoor heat exchanger, an expansion valve and an indoor heat exchanger connected in a ring;
a defrosting section for removing frost adhering to the indoor heat exchanger;
a blower that sends air to the indoor heat exchanger;
A control device that switches between a cooling operation for cooling the target space and a defrosting operation for controlling the defrosting unit to remove frost adhered to the indoor heat exchanger,
The control device starts the defrosting operation based on the current value of the blower,
During the cooling operation, when the current time is included in a predetermined time period, the control device is configured to operate based on the blowout temperature of the air in the indoor heat exchanger and the evaporation temperature of the refrigerant in the indoor heat exchanger. , while starting the defrosting operation, measuring the current value of the blower and setting the measured current value as a defrosting start threshold;
The control device starts the defrosting operation when the current value of the blower exceeds the defrosting start threshold value during the cooling operation when the current time is not included in the predetermined time period. , refrigeration system. 2. The refrigeration system according to claim 1 , wherein when the current time is not included in the predetermined time period, the control device ends the defrosting operation after a certain period of time has passed since the defrosting operation started. When the current time is included in the predetermined time period, the control device controls the blowing temperature of the air in the indoor heat exchanger and the evaporation temperature of the refrigerant in the indoor heat exchanger during the defrosting operation. 3 . The refrigeration system according to claim 1 , wherein the cooling operation is started based on , the current value of the blower is measured, and the measured current value is set as the defrosting end threshold. When the current time is not included in the predetermined time period, the control device operates the blower during the defrosting operation so that the current value of the blower during the defrosting operation reaches the end of defrosting. 4. The refrigeration system according to claim 3 , wherein said defrosting operation is terminated when the temperature is less than a threshold. When the current time is not included in the predetermined time period, the control device starts the defrosting operation, stops the blower, and operates the blower after a predetermined time has elapsed from the start of the defrosting operation. and measures the current value of the blower, restarts defrosting when the current value is equal to or greater than the defrosting end threshold, and terminates the defrosting operation when the current value of the blower is less than the defrosting end threshold. 4. The refrigeration system of claim 3 . The refrigeration system according to any one of claims 1 to 5 , wherein said defrosting section removes said frost adhering to said indoor heat exchanger with heat from a heater. The refrigeration system according to any one of claims 1 to 5 , wherein the defrosting section sprinkles water on the indoor heat exchangers to remove the frost adhering to the indoor heat exchangers with the heat of the water. 6. The refrigeration system according to any one of claims 1 to 5 , wherein said defrosting section removes said frost adhering to said indoor heat exchanger with the wind of said blower. The defrosting unit is
a bypass circuit that branches from the discharge side of the compressor, is connected between the expansion valve and the indoor heat exchanger, and causes part of the refrigerant discharged from the compressor to flow into the indoor heat exchanger;
6. The refrigeration system according to any one of claims 1 to 5 , further comprising a bypass valve provided in said bypass circuit for circulating and blocking said refrigerant flowing through said bypass circuit.