REFRIGERATION CYCLE APPARATUS AND METHOD OF CONTROLLING REFRIGERATION CYCLE APPARATUS

摘要

A predicted value of a condensing temperature of refrigerant and a predicted value of an evaporating temperature of the refrigerant after a compressor is started or after an operating capacity of the compressor is changed are calculated based on a condensor suction air temperature, an evaporator suction air temperature, and a compressor operating capacity. Then, an opening degree to be set for an expansion valve is determined based on the predicted value, the predicted value, and the compressor operating capacity.

主权项

1. A refrigeration cycle apparatus for circulating refrigerant through a circuit in which a compressor having a changeable operating capacity, a condensor, an expansion valve having a changeable opening degree, and an evaporator are connected to each other by pipes, the refrigeration cycle apparatus comprising:
a first temperature sensor for detecting a temperature of a heat medium to be subjected to heat exchange with the refrigerant in the condensor; a second temperature sensor for detecting a temperature of a heat medium to be subjected to heat exchange with the refrigerant in the evaporator; and a controller for controlling the operating capacity of the compressor and the opening degree of the expansion valve, the controller being configured to, when starting the compressor or when changing the operating capacity of the compressor
calculate a first temperature, which is a condensing temperature of the refrigerant, and a second temperature, which is an evaporating temperature of the refrigerant, being predicted after the compressor is started or after the operating capacity of the compressor is changed, based on a detection value of the first temperature sensor, a detection value of the second temperature sensor, and a setting value (VP) of the operating capacity to be set for the compressor andset the opening degree of the expansion valve based on the first temperature, the second temperature, the setting value (VP) of the operating capacity to be set for the compressor, and a refrigerant density of the refrigerant being in a liquid state.