CONTROL METHOD OF HIGH PRESSURE IN SUPERCRITICAL REFRIGERATION CIRCUIT WHICH FUNCTIONS REGULARLY Russian patent published in 2009 - IPC F25B9/00 F25B41/04 

FIELD: heating systems.

SUBSTANCE: invention refers to refrigerating engineering. Method refers to control of supercritical refrigeration circuit (2) which functions regularly and contains, in flow direction, the compressor, heat-removing heat exchanger (10), control valve (12) connected to outlet hole (14) of heat-removing heat exchanger (10), and device (16) for controlling control valve (12). Method involves the following stages: (a) (in subcritical mode) controlling control valve (12) so that pre-determined "subcritical pressure" can be maintained, which provides pre-determined underheating of liquid cooling agent at outlet hole (14) of heat-removing heat exchanger (10), (b) (in supercritical mode) controlling control valve (12) so that pre-determined "supercritical pressure" of supercritical cooling agent can be maintained at outlet hole (14) of heat-removing heat exchanger (10), and (c) (in marginal mode of boundary area located near critical point) controlling control valve (12) depending on "continuity pressure" which is determined based on pre-determined "subcritical pressure" and "supercritical pressure" of stages (a) and (b).

EFFECT: developing the method of controlling supercritical refrigeration circuit which functions regularly in boundary area located near critical point.

19 cl, 3 dwg