Carbon Dioxide Based Auxiliary Cooling System

Patent metadata

Field	Value
Publication number	US-2016178244-A1
Application number	US-201414578668-A
Country	US
Kind code	A1
Filing date	Dec 22, 2014
Priority date	Dec 22, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

The present application provides a cascade refrigeration system. The cascade refrigeration system may include a first side cycle, a second side cycle with a second side cycle carbon dioxide refrigerant, and an auxiliary cooling system to cool the second side cycle carbon dioxide refrigerant in the event of a power outage. The auxiliary cooling system may include an auxiliary carbon dioxide refrigerant.

First claim

We claim:

1 . A cascade refrigeration system, comprising:
a first side cycle; a second side cycle; the second side cycle comprising a second side cycle carbon dioxide refrigerant; and an auxiliary cooling system to cool the second side cycle carbon dioxide refrigerant in the event of a power outage; the auxiliary cooling system comprising an auxiliary carbon dioxide refrigerant.

2 . The cascade refrigeration system of claim 1 , wherein the auxiliary cooling system comprises an auxiliary compressor and an auxiliary expansion valve.

3 . The cascade refrigeration system of claim 1 , wherein the auxiliary cooling system comprises an auxiliary condenser.

4 . The cascade refrigeration system of claim 1 , wherein the auxiliary cooling system comprises an auxiliary gas cooler.

5 . The cascade refrigeration system of claim 1 , wherein the auxiliary cooling system comprises auxiliary condenser/evaporator.

6 . The cascade refrigeration system of claim 1 , wherein the second side cycle comprises a second side cycle receiver and wherein the auxiliary cooling system is in communication with the second side cycle receiver.

7 . The cascade refrigeration system of claim 1 , wherein the auxiliary cooling system comprises an auxiliary generator.

8 . The cascade refrigeration system of claim 1 , wherein the first side cycle and the second side cycle interface via a cascade evaporator/condenser.

9 . The cascade refrigeration system of claim 1 , wherein the first side cycle comprises a flow of an ammonia or a hydrocarbon refrigerant.

10 . The cascade refrigeration system of claim 1 , wherein the first side comprises a suction/liquid heat exchanger.

11 . The cascade refrigeration system of claim 1 , wherein the first side cycle comprises a first side compressor, a first side condenser, and a first side expansion device.

12 . The cascade refrigeration system of claim 1 , wherein the second side cycle comprises a second side compressor, a second side expansion device, and a second side evaporator.

13 . The cascade refrigeration system of claim 1 , wherein the second side cycle comprises a medium temperature loop and a medium temperature loop.

14 . The cascade refrigeration system of claim 1 , further comprising a plurality of auxiliary cooling systems.

15 . An method of providing auxiliary cooling in a refrigeration system, comprising:
flowing a natural refrigerant through a first side cycle; flowing a carbon dioxide refrigerant through a second side cycle; providing an auxiliary cooling system to cool the flow of the carbon dioxide refrigerant in the case of a power loss; and flowing an auxiliary carbon dioxide refrigerant through the auxiliary cooling system.

16 . A carbon dioxide based refrigeration system, comprising:
a receiver; a carbon dioxide refrigerant; and an auxiliary cooling system in communication with the receiver to cool the carbon dioxide refrigerant in the event of a power outage; the auxiliary cooling system comprising an auxiliary carbon dioxide refrigerant.

17 . The carbon dioxide refrigeration system of claim 16 , wherein the auxiliary cooling system comprises an auxiliary condenser.

18 . The carbon dioxide refrigeration system of claim 16 , wherein the auxiliary cooling system comprises an auxiliary gas cooler.

19 . The carbon dioxide refrigeration system of claim 16 , wherein the auxiliary cooling system comprises an auxiliary generator.

20 . The carbon dioxide refrigeration system of claim 16 , wherein the carbon dioxide refrigeration system comprises a cascade refrigeration system.

Assignees

• Heatcraft Refrigeration Products Llc

Inventors

• Delventura Robert
• Chaparro Ignacio Varela
• Pfister Steve

Classifications

• F25B7/00 Primary

  Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit (F25B9/00 takes precedence) · CPC title

• F25B2400/06

  Several compression cycles arranged in parallel · CPC title

• F25B5/02

  arranged in parallel · CPC title

• F25B2309/061

  with cycle highest pressure above the supercritical pressure · CPC title

• F25B2400/075

  with parallel compressors · CPC title