AIR CONDITIONER UTILIZING CARBON DIOXIDE REFRIGERANT

摘要

Air conditioner utilizing carbon dioxide refrigerant is provided to control discharge capacity of a compressor or an opening of a throttling unit in order to control maximum cooling load or maximum cooling efficiency. An air conditioner utilizing carbon dioxide refrigerant comprises a compressor(11) taking in carbon dioxide as refrigerant and then compressing it; a gas cooler(13) cooling refrigerant discharged from an outlet of the compressor; a throttling unit(16) controlling refrigerant flow rate while expanding refrigerant discharged from the gas cooler and then reducing pressure of it; an evaporator(15) evaporating refrigerant passed through the throttling unit by heat changing with blast air; and an indoor heat exchanger(18) and a control unit(22) heat-exchanging refrigerant passing from the evaporator through the compressor and refrigerant from the gas cooler through the throttling unit.