Refrigerating or heat pump system with heat rejection at...

F - Mech Eng,Light,Heat,Weapons – 25 – B

Patent

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F25B 9/00 (2006.01) F25B 39/04 (2006.01) F25D 23/00 (2006.01)

Patent

CA 2429857

A refrigerating or heat pump system includes an evaporator (23), a compressor (20), an air-cooled heat rejecting heat exchanger (21) and an expansion device (22) being connected in a closed circuit and operating in a trans critical vapor compression cycle. The heat rejecting heat exchanger (21) is cooled by natural upwards circulation/convention of air. In a preferred embodiment the heat rejecting exchanger (21) is built into an air flow conduit or shell (11) to improve the natural air circulation by obtaining a chimney effect.

Cette invention concerne un système de pompe de réfrigération ou de chauffage comprenant un évaporateur (23), un compresseur (20), un échangeur thermique (21) refroidi par air et rejetant de la chaleur, ainsi qu'un dispositif d'expansion (22) connecté en circuit fermé et fonctionnant selon un cycle à compression de vapeur transcritique. L'échangeur thermique à rejet de chaleur (21) est refroidi par la circulation/convection ascendante naturelle de l'air. Selon un mode de réalisation préféré, l'échangeur thermique (21) est construit dans une conduite ou un manchon d'air (11), ce qui favorise la circulation naturelle de l'air par effet de cheminée.

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