Cascade refrigeration system with secondary chiller loops

摘要

A refrigeration system includes a first portion having a primary loop and a secondary loop operably coupled by a first chiller, The primary loop circulates a refrigerant through the first chiller to provide cooling to a coolant in the secondary loop. The secondary loop has a supply portion and a return portion, the supply portion circulates the coolant to one or more temperature-controlled storage devices operating at a first temperature. A second portion has a primary loop and at least one secondary loop operably coupled by the second chiller. The primary loop circulates a refrigerant through the second chiller to provide cooling to coolant in the secondary loop. The secondary loop has a supply portion and a return portion, the supply portion circulates the coolant to one or more temperature-controlled storage devices operating at a second temperature. The return portion of the secondary loop of the first portion and the return portion of the secondary loop of the second portion share a common return header.

主权项

1. A refrigeration system, comprising:
a first portion having a primary loop and a secondary loop operably coupled by a first chiller, the primary loop configured to circulate a refrigerant through the first chiller to provide cooling to a coolant in the secondary loop, the secondary loop having a supply portion and a return portion, the supply portion configured to circulate the coolant to one or more temperature-controlled storage devices operating at a first temperature; and a second portion having a primary loop and at least one secondary loop operably coupled by at least one second chiller, the primary loop configured to circulate a refrigerant through the second chiller to provide cooling to coolant in the secondary loop, the secondary loop having a supply portion and a return portion, the supply portion configured to circulate the coolant to one or more temperature-controlled storage devices operating at a second temperature; wherein the return portion of the secondary loop of the first portion and the return portion of the secondary loop of the second portion share a common return header, wherein the second chiller pre-cools the coolant in the common return header to the second temperature and delivers the coolant at the second temperature to the supply portion of the secondary loop of the second portion, wherein the first chiller further cools the pre-cooled coolant from the second temperature to the first temperature and delivers the coolant at the first temperature to the supply portion of the secondary loop of the first portion.