High-pressure control mechanism for air-cooled heat pump

摘要

Focusing attention on an air-cooled heat pump including a supercooling circuit, it is an object to provide a high-pressure control mechanism for air-cooled heat pumps that allows efficient high-pressure control with reduced cost by utilizing the supercooling circuit. In an air-cooled heat pump (1) including a supercooling circuit (19) through which a portion of a liquid refrigerant diverted from a liquid refrigerant piping line (11B) flows through an electronic expansion valve for supercooling (20) and a supercooling heat exchanger (18) into an intake pipe (11C) of a compressor (2), a high-pressure-control bypass circuit (21) is provided that has an end thereof connected to a discharge pipe (11A) of the compressor (2) and another end thereof connected to the supercooling circuit (19) via switching means (22, 23) and that allows a portion of a high-pressure refrigerant gas discharged from the compressor (2) to flow through the electronic expansion valve for supercooling (20) into the liquid refrigerant piping line (11B).