FIELD: pumps.
SUBSTANCE: present invention discloses a heat pump cycle. Heat pump comprises heat transfer source, target heat transfer object and closed circuit of working medium. Circuit includes a compression device, a two-stage counter-flow heat exchanger, providing heat exchange of the working medium with the target heat transfer object, low-temperature expansion device, low-temperature heat exchanger, high-temperature expansion device and recuperating heat exchanger. Part of the working medium, which was cooled at the first stage, is additionally cooled by expansion before mixing with the heated working medium for input into the recuperating heat exchanger.
EFFECT: improved efficiency of the heat pump cycle.
19 cl, 9 dwg
