Refrigeration system

a refrigeration system and high-pressure technology, applied in the field of refrigeration systems, can solve the problems of limited possibility of accumulation of refrigerant on the high-pressure side, lack of refrigerating capacity, and inability to meet the needs of larger-scale distributed systems, etc., to achieve novel valve control, high pressure, and loss of heat transfer performance

a refrigeration system and high-pressure technology, applied in the field of refrigeration systems, can solve the problems of limited possibility of accumulation of refrigerant on the high-pressure side, lack of refrigerating capacity, and inability to meet the needs of larger-scale distributed systems, etc., to achieve novel valve control, high pressure, and loss of heat transfer performance

US20100199707A1Inactive Publication Date: 2010-08-12STAR REFRIGERATION
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  • Refrigeration system
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Embodiment Construction

[0025]One embodiment of the invention is illustrated schematically in FIG. 1.

[0026]In this system the refrigerant carbon dioxide is used for cooling of chilled food display cases in a supermarket. A set of one or more compressors (1A, 1B etc) pump refrigerant gas to a high pressure condition at which it can reject heat to atmosphere or some other cooling medium. The gas is conducted from the compressor(s) through pipes (6B, 6C) to a heat rejection device (2). From the heat rejection device the cooled refrigerant passes through pipes (6D, 6F) to a heat exchanger located in the receiver (4) and from there through pipes (6G) to a set of one or more system evaporators (5A, 5B etc).

[0027]When the temperature of the heat sink (the zone to which heat is rejected from heat rejection device (2)) is higher than approximately 25° C. then the compressors will be required to raise the carbon dioxide gas to a supercritical pressure, typically in the range 80 to 120 bar absolute. This can be descr...

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Abstract

A refrigerating system comprises a compressor (1A, 1B, 1C), a heat rejection device (2), an expansion device (15), an evaporator (5A, 5B, 5C) and a receiver (4), capable of operating with the compressor discharge higher than the critical pressure of the refrigerant; wherethe flow outlet from the heat rejection device is regulated by a pressure control valve (7),the pressure downstream of the pressure control valve is regulated by a gas vent valve (8),the refrigerant flow to the evaporator is further regulated by an automatic control device (41, 52, 14) at the inlet to the evaporator, andthe automatic control device being set to permit intermittent flow of liquid refrigerant to the receiver during normal operation of the system.The refrigerant may be carbon dioxide, which may operate under transcritical pressures e.g. 80 to 120 bar absolute. The receiver acts as a trap for any liquid from the evaporator and ensures that the gas flow to the compressor suction is dry.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority of United Kingdom Patent Application 0902192.4 filed Feb. 11, 2009.TECHNICAL FIELD[0002]The present invention relates to a refrigeration system, especially utilising carbon dioxide as refrigerant.BACKGROUND[0003]The prohibition of chlorofluorocarbons as refrigerants, which results from their deleterious effect on the ozone layer, has led to a number of alternative strategies to provide cooling without adverse environmental impact. The majority of systems have used hydrofluorocarbons, which have no effect on stratospheric ozone, but which in many cases have a high global warming potential and are therefore known to contribute to climate change through global warming. Carbon dioxide is a suitable fluid for use as a refrigerant, and was one of the earliest fluids used when mechanical refrigeration was developed in the raid 19th century. Carbon dioxide has no effect on the ozone layer, and is present in the atm...

Claims

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Application Information

Patent Timeline
12 Aug 2010
Publication
US20100199707A1
IPC
F25D17/02; F25B1/00; F25B43/00
CPC
F25B5/02; F25B9/008; F25B43/006; F25B49/005; F25B2309/061; F25B2341/063; F25B2600/2525; F25B2400/075
Inventors
PEARSON, ANDREW BRASH