Refrigeration apparatus

摘要

A refrigeration apparatus includes a multistage compression mechanism, a heat-source-side main heat exchanger, at least one heat-source-side sub heat exchanger, a usage-side heat exchanger, a switching mechanism, an expansion mechanism and a refrigerant piping group. The refrigerant piping group connects the multistage compression mechanism, the switching mechanism, the heat-source-side main heat exchanger, the heat-source-side sub heat exchanger, the expansion mechanism and the usage-side heat exchanger so that during the heating operation, the heat-source-side main heat exchanger and the heat-source-side sub heat exchanger are connected in series.

主权项

1. A refrigeration apparatus comprising:
a multistage compression mechanism in which one low-stage compression part and a plurality of high-stage compression parts are respectively connected in series; a heat-source-side main heat exchanger that functions as a radiator during a cooling operation, and functions as an evaporator during a heating operation; a plurality of heat-source-side sub heat exchangers that
during the cooling operation, function as radiators that cool intermediate-pressure refrigerant in the course of compression that is taken into the high-stage compression parts, andduring the heating operation, function as evaporators; a usage-side heat exchanger that functions as an evaporator during the cooling operation and functions as a radiator during the heating operation; switching mechanisms that change conditions so that
during the cooling operation, the refrigerant is delivered from the heat-source-side main heat exchanger to the usage-side heat exchanger, andduring the heating operation, the refrigerant is delivered from the usage-side heat exchanger to the heat-source-side main heat exchanger and the heat-source-side sub heat exchangers; an expansion mechanism that
during the cooling operation, depressurizes the refrigerant delivered from the heat-source-side main heat exchanger to the usage-side heat exchanger, andduring the heating operation, depressurizes the refrigerant delivered from the usage-side heat exchanger to the heat-source-side main heat exchanger and the heat-source-side sub heat exchangers; and a refrigerant piping group connecting the multistage compression mechanism, the switching mechanisms, the heat-source-side main heat exchanger, the heat-source-side sub heat exchangers, the expansion mechanism and the usage-side heat exchanger so that during the heating operation, the refrigerant flows in series to not less than two of the heat-source-side sub heat exchangers of the plurality of heat-source-side sub heat exchangers.