Heating and refrigeration systems using refrigerant mass flow

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

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F25B 41/00 (2006.01) F25B 9/00 (2006.01) F25B 41/06 (2006.01) F25B 31/00 (2006.01)

Patent

CA 2441605

Vapor compression heat exchange systems are disclosed that are designed to allow for optimal mass flow of refrigerant there through. The systems of the present invention do not employ conventional refrigerant metering devices, such as capillary tubs and expansion valves, which restrict mass flow, but rather incorporate an openly fixed orifice in-line with the conduits connecting the condenser to the evaporator, thereby maintaining the preferential differential between the high pressure condenser side and low pressure evaporator side of the system during operation. Provision of the fixed orifice allows for optimal refrigerant mass flow as measured by cooler compressor temperatures, cooler compressor discharge temperatures, increased heat of rejection, increased heat of absorption, and improved heating and cooling efficiency. The present invention may employ any conventional refrigerant including the newer HFC refrigerants, such as R-410A.

La présente invention concerne des systèmes d'échange thermique par compression de vapeur qui sont conçus pour permettre un débit massique optimal de réfrigérant dans ces systèmes. Ces systèmes n'utilisent pas de dispositifs de dosage de réfrigérant classiques, tels que des tubes capillaires et des vannes d'expansion, qui réduisent le débit massique, mais ils comprennent un orifice ouvert fixe aligné avec les conduits raccordant le condenseur à l'évaporateur, ce qui permet de maintenir le différentiel préférentiel entre le coté du condenseur sous haute pression et le côté de l'évaporateur sous basse pression de ce système pendant son fonctionnement. Cet orifice fixe permet un débit massique de réfrigérant optimal comme le mesure les températures du compresseur de refroidisseur, les températures d'évacuation du compresseur de refroidisseur, la chaleur de rejet accrue, la chaleur d'absorption accrue et l'efficacité améliorée du chauffage et du refroidissement. Cette invention peut utiliser n'importe quel réfrigérant classique, y compris les nouveaux réfrigérants pentafluoroéthane (HFC), tel que le R-410A.

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