Internally grooved heat transfer tube for high-pressure refrigerant
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United States of America Patent
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Feb 17, 2009
Grant Date -
Aug 30, 2007
app pub date -
Apr 17, 2007
filing date -
Dec 2, 2004
priority date (Note) -
Expired
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Abstract
An internally grooved heat transfer tube for a cross fin tube type heat exchanger of a refrigerating air-conditioning water supply apparatus using a high-pressure refrigerant, wherein an intra-tubular heat transfer rate is improved while maintaining a sufficient strength for pressure resistance.] is a cross sectional area of each groove. N/Di is not smaller than 8 and not greater than 24 where N is a number of grooves, and Di is a maximum inside diameter corresponding to an inside diameter of the tube.
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