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Carbon Dioxide Based Auxiliary Cooling System

a technology of auxiliary cooling and carbon dioxide, which is applied in the field of refrigeration systems, can solve the problems of carbon dioxide based systems losing refrigerant during power outages, dioxide based systems starting to gain heat, and increasing refrigerant pressure and exceeding the effect of pressur

Inactive Publication Date: 2016-06-23
HEATCRAFT REFRIGERATION PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent provides a cascade refrigeration system with an auxiliary cooling system using carbon dioxide refrigerant. The system includes a first side cycle and a second side cycle with a second side cycle carbon dioxide refrigerant. The auxiliary cooling system has an auxiliary carbon dioxide refrigerant that is used to cool the second side cycle carbon dioxide refrigerant in the event of a power outage. The system uses natural refrigerant or carbon dioxide refrigerant in a receiver, and the auxiliary cooling system ensures continuous cooling of the refrigerant in the event of a power outage.

Problems solved by technology

Unlike hydrofluorocarbons, however, carbon dioxide based systems may lose refrigerant during power outages.
In the case of a power outage, the carbon dioxide based system may start gaining heat such that the refrigerant pressure may rise and exceed the design pressure of the overall refrigeration system.
These known backup devices, however, generally use hydrofluorocarbon based refrigerants such that the refrigeration system as a whole cannot be considered truly “green” or hydrofluorocarbon free.

Method used

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Examples

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Embodiment Construction

[0013]Referring now to the drawings, in which like numerals refer to like elements throughout the several views, FIG. 1 shows an example of a cascade refrigeration system 100. The cascade refrigeration system 100 may be used to cool any type of enclosure for use in, for example, supermarkets, cold storage, and the like. The cascade refrigeration system 100 also may be applicable to heating, ventilation, and air conditioning and / or different types of industrial applications. The overall cascade refrigeration system 100 may have any suitable size or capacity.

[0014]Generally described, the cascade refrigeration system 100 may include a first or a high side cycle 110 and a second or a low side cycle 120. The high side cycle 110 may include a high side compressor 130, a high side oil separator 140, a high side condenser 150, a high side receiver 160, and a high side expansion device 170. The high side cycle 110 also may include a suction / liquid heat exchanger 180 and a suction accumulato...

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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.

Description

TECHNICAL FIELD[0001]The present application and the resultant patent relate generally to refrigeration systems and more particularly relate to a carbon dioxide based auxiliary cooling system for a refrigeration system that may be free of the use of hydrofluorocarbons and the like.BACKGROUND OF THE INVENTION[0002]Cascade refrigeration systems generally include a first side cooling cycle, or a high side cycle, and a second side cooling cycle, or a low side cooling cycle. The two cooling cycles interface through a common heat exchanger, i.e., a cascade evaporator-condenser. The cascade refrigeration system may provide cooling at very low temperatures in a highly efficient manner.[0003]Current refrigeration trends promote the use of carbon dioxide and other types of natural refrigerants as opposed to conventional hydrofluorocarbon based refrigerants. Unlike hydrofluorocarbons, however, carbon dioxide based systems may lose refrigerant during power outages. In the case of a power outage...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25B7/00
CPCF25B7/00F25B9/008F25B5/02F25B40/00F25B2309/061F25B2400/06F25B2400/075
Inventor DELVENTURA, ROBERTCHAPARRO, IGNACIO VARELAPFISTER, STEVE
Owner HEATCRAFT REFRIGERATION PRODS
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