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Heat exchanger arrangementHeat exchanger arrangement description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080184713, Heat exchanger arrangement. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS
This applications claims the benefit of the filing date of earlier filed provisional application Ser. No. 60/663,962 filed Mar. 18, 2005. Further, copending application docket 05-258-WO, entitled HIGH SIDE PRESSURE REGULATION FOR TRANSCRITICAL VAPOR COMPRESSION SYSTEM and filed on even date herewith, and the aforesaid provisional application Ser. No. 60/663,962, disclose prior art and inventive cooler systems. The disclosure of said applications is incorporated by reference herein as if set forth at length. BACKGROUND OF THE INVENTIONThe invention relates to a heat exchanger arrangement for a vapor compression system, especially a transcritical vapor compression system. The heat rejection process in transcritical vapor compression refrigeration applications and systems occurs at a pressure above the critical pressure of the refrigerant. The refrigerant does not undergo a phase change during this process and the temperature of the refrigerant changes throughout the entire heat rejection process. The energy efficiency of the refrigeration system increases if the heat exchanger arrangement approaches an ideal counter flow arrangement with the heat sink. It is therefore a primary object of the invention to provide a system having an efficient heat exchanger arrangement. It is a further object of the invention to provide such a system which is readily incorporated into existing refrigeration systems. Other objects and advantages will appear herein. SUMMARY OF THE INVENTIONAccording to the invention, the foregoing objects and advantages have been attained. According to the invention, a refrigeration system is provided which comprises a compressor for driving a refrigerant along a flow path in at least a first mode of system operation; a first heat exchanger along the flow path downstream of the compressor in the first mode; a second heat exchanger along the flow path upstream of the compressor in the first mode; and a pressure regulator or expansion device in the flow path downstream of the first heat exchanger and upstream of the second heat exchanger in the first mode, wherein the first heat exchanger is positioned within a housing which defines a flow path for heat exchange fluid and the housing defines a zone of reduced flow area along the flow path, and wherein the first heat exchanger is positioned in the zone of reduced flow area. According to the invention, a refrigeration system is provided which includes a compressor for driving a refrigerant along a flow path in at least a first mode of system operation; a first heat exchanger along the flow path downstream of the compressor in the first mode; a second heat exchanger along the flow path upstream of the compressor in the first mode; and a pressure regulator or expansion device in the flow path downstream of the first heat exchanger and upstream of the second heat exchanger in the first mode, wherein the first heat exchanger comprises a plurality of substantially parallel refrigerant flow paths, and wherein heat exchange fluid for the first heat exchanger is directed in counter flow substantially transverse to the refrigerant flow paths. A preferred embodiment is drawn to transcritical vapor compression operation using CO2 refrigerant fluid. Serpentine and/or parallel modular refrigerant flow paths are provided. A particular environment of use for the invention is in connection with so-called bottle coolers, or cooling units for cooling and storing beverages. Such coolers can be in the form of vending machines are refrigerator cases, for example. In one embodiment, the housing of the beverage cooler defines an internal flow area for heat exchange fluid such as air, and this flow area has a flow restriction which serves to speed flow of the heat exchange fluid therethrough. According to the invention, the refrigerant flow paths are positioned at the flow restriction. BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is a schematic illustration of a counter flow heat exchanger arrangement according to the invention; FIG. 2 is a schematic illustration of an alternate counter flow heat exchanger arrangement according to the invention; FIG. 3 is an illustration of a preferred structure for a beverage cooler including the heat exchanger arrangement of the present invention; Continue reading about Heat exchanger arrangement... Full patent description for Heat exchanger arrangement Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Heat exchanger arrangement patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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