Non-HCFC refrigerant mixture for an ultra-low temperature refrigeration system
a refrigeration system and refrigerant mixture technology, applied in the field of non-hydrochlorofluorocarbon (non-hcfc) design of refrigerant mixture for ultra-low temperature refrigeration system, can solve the problems of system failure, reduced refrigerant cooling capability of compressors, and many of these refrigerant mixtures cannot be simply substituted for cfc-containing refrigerants, etc., to achieve the effect of safe application
Inactive Publication Date: 2005-04-07
THERMO ELECTRON A DE
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Benefits of technology
It is therefore a feature of the present invention to provide a non-HCFC ultra-low temperature refrigerant mixture that can safely be applied in the field as needed without the risks associated with CFC or HCFC ultra-low temperature refrigerants.
Problems solved by technology
Although non-CFC refrigerant mixtures have been developed, it has been discovered that most of these refrigerant mixtures cannot simply be substituted for CFC-containing refrigerants in currently available refrigeration systems due to the different thermodynamic properties of the refrigerants.
The present inventor has discovered that using non-CFC refrigerants in conventional ultra-low and cryogenic temperature systems cause an imbalanced flow of the refrigerants in the refrigeration circuit, which reduces the cooling capability of the refrigerants to the compressor.
Such low levels of compressor cooling can cause a system to fail due to compressor overheating.
Method used
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Referring now to the Figures, in FIG. 1 there is shown a Single compressor ultra-low and cryogenic temperature refrigeration systems, as shown in FIG. 1, pump refrigerants through a condenser, heat exchanger section and evaporator coils in a closed circuit loop to provide temperatures as low as −150° C. The heat exchanger section and evaporator coils referred to in FIG. 1 are specifically described in FIG. 2. The conventional refrigeration compressor and condenser referred to in FIG. 1 are not shown in FIG. 2. The air-cooled or water-cooled condenser cools the compressor and removes BTU's from the refrigerant by partially changing the refrigerant mixture from vapor to liquid, whereas the liquid / gas separator separates liquid refrigerant from vapor and returns lubricating oil to the compressor. The heat exchangers use the thermophysical properties of the refrigerants to effect the cooling process. The evaporator coils permit the flow of refrigerant at ultra-low temperatures to absor...
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Methods and apparatus for a refrigeration heat exchanger section useful in circulating a substantially non-HCFC refrigerant mixture which comprises: a compressor means, an auxiliary condenser, a first condenser, a second condenser, a third condenser, a subcooler and a liquid / gas separator, wherein a subcooled refrigerant liquid mixture taken as bottoms from the liquid / gas separator is distributed and expanded by a first expansion means and a second expansion means to form first and second expanded streams, respectively, such that the first expanded stream is returned to the auxiliary condenser and compressor in order to avoid overheating of the compressor.
Description
FIELD OF INVENTION The present invention relates generally to an apparatus for low temperature refrigeration systems. More particularly, the present invention relates to a non-hydrochlorofluorocarbon (non-HCFC) design of a refrigerant mixture for an ultra-low temperature refrigeration system. BACKGROUND OF THE INVENTION In refrigeration systems, a refrigerant gas is compressed in a compressor unit. Heat generated by the compression is then removed generally by passing the compressed gas through a water or air cooled condenser coil. The cooled, condensed gas is then allowed to rapidly expand into an evaporating coil where the gas becomes much colder, thus cooling the coil and the inside of the refrigeration system box around which the coil is placed. Ultra-low and cryogenic temperatures ranging from −95° C. to −150° C. have been achieved in refrigeration systems using a single circuit vapor compressor. These systems typically use a single compressor to pump a mixture of four or fi...
Claims
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IPC IPC(8): F25B9/00
CPCC09K2205/12F25B2400/23F25B9/006C09K2205/13
Inventor WENG, CHUAN
Owner THERMO ELECTRON A DE