| 摘要 |
PROBLEM TO BE SOLVED: To enhance a heat exchanging rate by providing a heating tube incorporating a plurality of channels partitioned by a plurality of partition walls and forming, on the inner surface of each channel, with a film for repelling lubricant flowing through each channel along with carbon dioxide thereby enhancing heat transmission between the heating tube and carbon dioxide flowing through the heating tube. SOLUTION: A heat exchanger constituting a carbon dioxide refrigeration cycle is employed in radiator, inner heat exchanger, cooler, and the like, and incorporates one or a plurality of heating tube 7 formed by integral extrusion of aluminum alloy. A long heating tube 7 incorporates a plurality of channels 11 partitioned by a plurality of partition walls and a film of 10μm thick or less for repelling lubricant flowing through these channels 11 along with refrigerant, i.e., carbon dioxide, is formed on the inner surface of the plurality of channels. The film is formed by flowing material liquid through these channels 11 and drying the liquid adhering to the inner surface of the channels 11.
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