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Heat exchanging tube and heat exchangerRelated Patent Categories: Heat Exchange, Tubular StructureHeat exchanging tube and heat exchanger description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070074862, Heat exchanging tube and heat exchanger. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional of U.S. application Ser. No. 10/529,632 filed on Sep. 28, 2005, which claims Priority to Japanese Patent Application No. 2002-290180, filed on Oct. 2, 2002, U.S. Provisional Patent Application No. 60/421,082, filed on Oct. 25, 2002 and Japanese Patent Application No. 2003-327179, filed on Sep. 19, 2003. The disclosures of those applications are incorporated by reference in their entireties. [0002] U.S. application Ser. No. 10/529,632 filed on Sep. 28, 2005 is filed under 35 U.S.C. .sctn.111(a) claiming the benefit pursuant to 35 U.S.C. .sctn.119(e)(1) of the filing date of Provisional Application No. 60/421,082 filed on Oct. 25, 2002 pursuant to 35 U.S.C. .sctn.111(b). TECHNICAL FIELD [0003] The present invention relates to a heat exchanger such as a condenser or an evaporator for use in a refrigeration cycle of automobile air-conditioners, household air-conditioners, refrigerators, electronics device coolers or the like, and also relates to a heat exchanging tube thereof. BACKGROUND ART [0004] The following description sets forth the inventor's knowledge of related art and problems therein and should not be construed as an admission of knowledge in the prior art. [0005] As conventional condensers for use in a refrigeration cycle of automobile air-conditioners, the so-called multi-flow type heat exchangers are widely employed. One example of such a condenser is shown in International Publication No. WO 02/42706. [0006] This heat exchanger is provided with a pair of vertical headers and a plurality of heat exchanging tubes arranged in parallel along the up-and-down direction with their opposite ends connected to the headers. The plurality of heat exchanging tubes are classified by partitions provided in the headers to thereby form a plurality of passes. A gaseous refrigerant introduced into the refrigerant inlet of one of the headers passes through each pass in turn to thereby be condensed and liquefied, and then flows out of the refrigerant outlet of one of the headers. [0007] The size of such a heat exchanger is decided by, for example, the required heat rejection performance and the size of the installation space. A common heat exchanging tube is flat in cross-section with a width of about 20 mm. [0008] Such a heat exchanger is usually mounted in vehicles such as automobiles or trucks. In recent years, such vehicles are strongly required to be light in weight for the purpose of improving the fuel economy and/or decreasing toxic emission gas (e.g., CO.sub.2, NO.sub.x). Accordingly, every kinds of automobile parts are required to be light in weight, and therefore the aforementioned heat exchangers are not exceptional. [0009] Under the circumstances, in order to reduce the weight of heat exchanger, it can be contemplated to reduce the height of heat exchanging tube, reduce the thickness of external peripheral wall of the heat exchanging tube or reduce the thickness of external heat releasing fin disposed between the adjacent heat exchanging tubes. [0010] Such methods for decreasing weight are, however, considered to be reached a limit, and a further attempt to decrease the weight based on such methods causes decreased inherent heat exchanging performance. For example, if the tube height is set to be lower, the inner perimeter of each refrigerant flow path becomes shorter, causing deteriorated heat releasing performance. If the thickness of the tube external peripheral wall is set to be thinner, the pressure resistance deteriorates. Further, if the fin thickness is set to be thinner, the temperature difference between the portion of the fin which is in contact with the tube and the central portion of the fin becomes larger, causing deteriorated heat releasing performance. [0011] The description herein of advantages and disadvantages of various features, embodiments, methods, and apparatus disclosed in other publications is in no way intended to limit the present invention. Indeed, certain features of the invention may be capable of overcoming certain disadvantages, while still retaining some or all of the features, embodiments, methods, and apparatus disclosed therein. DISCLOSURE OF INVENTION [0012] It is an object of the present invention to provide a heat exchanging tube capable of improving heat exchanging performance and decreasing passage resistance while decreasing the weight and obtaining enough pressure resistance. [0013] It is another object of the present invention to provide a heat exchanger capable of improving heat exchanging performance and decreasing passage resistance while decreasing the weight and obtaining enough pressure resistance. [0014] The inventors have found optimum conditions capable of attaining the aforementioned objects of a heat exchanging tube and a heat exchanger after conducting various detail analysis of a structure of a heat exchanging tube for use in condensers and the like and repeatedly performing detail experiments/studies based on the analysis. [0015] According to the first aspect of the present invention, [0016] (1) A heat exchanging tube provided with a flat tube main body having a predetermined length and a plurality of refrigerant passages extending in a tube longitudinal direction and arranged in a tube widthwise direction, wherein the following relational equations are satisfied: W=6 to 18 mm (a), Ac/At.times.100=50 to 70% (b) and P/L.times.100=350 to 450% (c) where "W" is a width of the tube main body, "Ac" is a total cross-sectional area of the refrigerant passages, "At" is a total cross-sectional area of the tube main body (including the refrigerant passages), "L" is an external perimeter of the tube main body and "P" is a total inner perimeter of the refrigerant passage. [0017] The heat exchanging tube according to the heat exchanging tube for use in heat exchanges as defined in the aforementioned item (1) (first aspect of the present invention) is applied to the so-called multi-flow type heat exchanger for use in condensers and the like in a refrigerant cycle of an automobile air-conditioner as shown in FIGS. 1 and 2. [0018] The heat exchanger is provided with a pair of vertical headers 50 and 50, a plurality of heat exchanging tubes 60 arranged in parallel with the opposite ends thereof connected to the headers 50 and 50, fins 51 disposed between the adjacent tubes 60 and outside the outermost tubes 60 and side plates 52 disposed outside the outermost fins 51. The heat exchanging tubes 60 are classified by partitions 53 provided in the headers 50 and 50 into a plurality of passes C1 to C3. The gaseous refrigerant introduced via the refrigerant inlet 50a provided at the upper portion of one of the headers 50 passes through each pass C1 to C3 in a meandering manner while being exchanged with the ambient air to be condensed and liquefied, and then flows out of the refrigerant outlet 50b provided at the lower portion of the other header 50. [0019] The tube 60 of this heat exchanger is an extruded tube made of aluminum (or its alloy). [0020] As shown in FIGS. 3 and 4, this heat exchanging tube 60 has a flat tube main body 60 with a height H smaller than the width W. Continue reading about Heat exchanging tube and heat exchanger... Full patent description for Heat exchanging tube and heat exchanger Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Heat exchanging tube and heat exchanger patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. 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