REFRIGERANT SYSTEM PROVIDED WITH DIRECT CONTACT HEAT EXCHANGER, AND CONTROL METHOD OF REFRIGERANT SYSTEM

摘要

In this system, while heat exchange is efficiently carried out through direct contact of multiple types of refrigerant, the refrigeration cycle function is made to function adequately without the problem of contamination of the refrigeration cycle refrigerant by a dissimilar refrigerant. This refrigerant system (1) is provided with: a heat source cycle (10) comprising a compressor (11), a heat exchanger (12) and a decompression unit (13); a heat transport loop (20) which circulates a liquid-phase transport refrigerant that transports heat towards a heat load; and a direct contact heat exchanger (30) which allows direct contact between the transport refrigerant and a heat source refrigerant sealed in the heat source cycle (10). As a heat source refrigerant, a second refrigerant is sealed in the heat source cycle (10) in addition to the first refrigerant. Of the first refrigerant and the second refrigerant, which has a higher boiling point than that of the first refrigerant, at least the first refrigerant boils in the direct contact heat exchanger (30), into which the heat source refrigerant passing through the decompression unit (13) flows, and the density of the liquid phase of the second refrigerant is lower than the density of the transport refrigerant.