空調用アコーディオン形オフセットフィン熱交換器の開発 [in Japanese] Development of an Accordion-type Offset-fin Heat Exchanger for Air-conditioners [in Japanese]
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To reduce the depth of the indoor heat exchanger in room air-conditioners, we studied fin and tube heat exchangers, and found that we could make the heat transfer coefficient of fins 30% higher than of conventional fins by reducing louver width and fin pitch.<br>We also improved water drainage on the surface of the fins by adopting accordion-type offset-fin heat exchangers.<br>We found that the material cost of a heat exchanger was minimized when the heat exchanger had a tube 7 mm in diameter, and we could increase the heat transter coefficient of the refrigerant side by developing a new grooved tube 7 mm in diameter.<br>We succeeded in making the heat exchanger 40% thinner than conventional types.
Trans.JSRAE 12(2), 219-224, 1995-07-31
Japan Society of Refrigerating and Air Conditioning Engineers