(57) It is an object of the present invention to reduce occurrence of noise in an operation
by inhibiting occurrence of flow sound of refrigerant. A refrigeration apparatus (1)
is a refrigeration apparatus using supercritical refrigerant operating in a zone that
high pressure of the supercritical refrigerant is equal to or greater than the critical
pressure. The refrigeration apparatus (1) includes a compressor (21), a gas cooler
(23, 31), an expansion mechanism (V2, V5), an evaporator (31, 23), discharge pressure
detection means (P1, T2, T3) and a control section (5). The compressor is configured
to compress the supercritical refrigerant. The gas cooler is configured to cool the
supercritical refrigerant compressed by the compressor. The expansion mechanism is
configured to decompress the supercritical refrigerant. The evaporator is configured
to evaporate the supercritical refrigerant decompressed by the expansion mechanism.
The discharge pressure detection means is capable of detecting discharge pressure
of the compressor. The control section is configured to regulate the opening degree
of the expansion mechanism for controlling the discharge pressure to be equal to or
greater than the critical pressure when the refrigeration apparatus is activated and
the discharge pressure is less than the critical pressure.
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