Patent ID: 8528359
Filing Date: 2013-09-10
Classification: F25B

Abstract:
1. A refrigerant vapor compression system including a compression device disposed in a refrigerant circuit for compressing a refrigerant vapor from a suction pressure to a discharge pressure, a heat rejecting heat exchanger disposed in the refrigerant circuit downstream with respect to refrigerant flow of the compression device, and a heat accepting heat exchanger disposed in the refrigerant circuit downstream with respect to refrigerant flow of the heat rejecting heat exchanger and upstream with respect to refrigerant flow of the compression device, the refrigerant vapor compression system characterized by: an economizer heat exchanger having a first pass and a second pass operatively associated in heat transfer relationship, the first pass disposed in the refrigerant circuit downstream with respect to refrigerant flow of the heat rejecting heat exchanger and upstream with respect to refrigerant flow of the heat accepting heat exchanger; a primary expander disposed in the refrigerant circuit downstream with respect to refrigerant flow of the first pass of said economizer heat exchanger and upstream with respect to refrigerant flow of said heat accepting heat exchanger; an evaporator bypass line providing a refrigerant flow path for passing a partially expanded portion of the refrigerant from the refrigerant circuit after having traversed the first pass of said economizer heat exchanger through the second pass of said economizer heat exchanger and into an intermediate pressure stage of said compression device; an economizer bypass line for passing a portion of the refrigerant from the refrigerant circuit into said evaporator bypass line at a location downstream with respect to refrigerant flow of the second pass of said economizer heat exchanger; and a restrictor type expansion device disposed in said economizer bypass line for expanding the refrigerant passing therethrough to a lower pressure to provide a liquid component of refrigerant flow.