| 摘要 |
PROBLEM TO BE SOLVED: To provide a small-sized heat exchanger having sufficient pressure withstanding strength and capacity equivalent to a condenser of a conventional refrigeration unit using Fleon (R) as a refrigerant, as a heat exchanger used for a vapor compression type refrigeration unit using carbon dioxide as a refrigerant. SOLUTION: A plurality of small-diameter heat exchanger tubes 2 with the inner diameter of 0.1-2 mm are stuck to both faces of a metal plate 1 by brazing in the parallel state of the axes and thermally connected. A plurality of such plates 1 are arranged parallel with spaces in the vertical state of the axes of the jointed small-diameter heat exchanger tubes 2. The upper end of each plate 1 is connected to a header 4 provided with a refrigerant inlet port 5, and the lower end is connected to a header 4' provided with a refrigerant outlet port. The header 4 and the header 4' are communicated with each other by the small-diameter heat exchanger tubes 2 jointed to the respective plates 1. The plate 1 has a plurality of apertures 3 at spaces, and the refrigerant passages of the headers 4, 4' and small-diameter heat exchanger tubes 2 are constituted to allow the refrigerant flowing in the small-diameter heat exchanger tubes 2, to flow turning around between the headers 4, 4'. COPYRIGHT: (C)2003,JPO
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