Kälteanlage mit Drucksteuerventil

摘要

A refrigerating system of vapor compression type operating at a super critical area, while obtaining an increased efficiency. The refrigerating system includes a pressure control means (3) for controlling the temperature and the pressure at the outlet of a heat emitter (2). The pressure control valve (3) responds to a pressure difference between the inlet pressure of the refrigerant to the pressure control valve and the pressure in an outwardly sealed chamber (12) in which the refrigerant is filled such that, with respect to the volume of the chamber (12) under closed condition of the pressure control valve, a density of the refrigerant is in a range between a density of a saturated liquid at a temperature of 0 DEG C and a density at the critical point of the refrigerant. As a result, the pressure and the temperature at the outlet of the heat emitter (2) is controlled substantially along the optimum control line eta max, resulting in an effective execution of a refrigerating cycle at the critical area.