(57) In a refrigeration cycle apparatus having an expansion mechanism, it is an object
of the present invention to swiftly generate a pressure difference upstream and downstream
of the expansion mechanism of , thereby enhancing the starting performance of the
refrigeration cycle apparatus. In a control method of a refrigeration cycle apparatus
comprising a compression mechanism 2, a utilizing-side heat exchanger 3, an expansion
mechanism 5 for recovering power, a heat source-side heat exchanger 6, and heat source
fluid transfer means 9 for transferring a heat source fluid to the heat source-side
heat exchanger 6, revolution number of the heat source fluid transfer means 9 is made
smaller than target revolution number or the heat source fluid transfer means 9 is
stopped during a predetermined time after the compression mechanism 2 is started.
With this method, when the compression mechanism 2 is started, the pressure difference
can be generated upstream and downstream of the expansion mechanism 5 for a short
time, the operation of the expansion mechanism 5 does not become unstable, vibration
and noise can be prevented, and the refrigeration cycle apparatus can swiftly be started.
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