Patent ID: 8079229
Filing Date: 2011-12-20
Classification: F24D,F25B

Abstract:
1. A refrigerant vapor compression system for heating liquid, comprising: a refrigerant compression device wherein a refrigerant is compressed from a suction low pressure to a discharge high pressure; a refrigerant-to-liquid heat exchanger wherein high pressure refrigerant is received from a discharge port of said compression device and passes in heat exchange relationship with the liquid to be heated, whereby the high pressure refrigerant transfers heat to the liquid; an economizer heat exchanger having a first pass receiving a first portion of the refrigerant having traversing said refrigerant-to-liquid heat exchanger and a second pass receiving a second portion of the refrigerant having traversed said refrigerant-to-liquid heat exchanger, said first pass and said second pass operatively associated in heat exchange relationship whereby the first portion of the refrigerant having traversed said refrigerant-to-liquid heat exchanger transfers heat to the second portion of the refrigerant having traversed said refrigerant-to-liquid heat exchanger; a first expansion device wherein the first portion of the refrigerant having traversed said refrigerant-to-liquid heat exchanger and said first pass of said economizer heat exchanger is expanded to a first lower pressure; a second expansion device wherein the second portion of refrigerant having traversed said refrigerant-to-liquid heat exchanger is expanded to a second lower pressure; an evaporator wherein the first portion of the refrigerant having traversed said first expansion device passes in heat exchange relationship with a fluid to be cooled; and a refrigerant circuit comprising, wherein the second portion and the third portion enter the compression device at different locations.