The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회지:설비저널)
- Volume 17 Issue 3
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- Pages.230-237
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- 1988
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- 1229-6430(pISSN)
Experiments on the Condensation Heat Transfer Enhancement of Horizontal Circular Tube with Threaded Outside Surface
외표면 형상이 원관의 응축열전달에 미치는 영향
Abstract
An experiment was carried out to study the condensation heat transfer enhancement of horizontal circular cylinders with varying outside surface configurations. The refrigerant used is Freon-22 and the test condensing temperature is 34.1C. Pin-finned tube shows about 2.5-3.5 times higher overall heat transfer coefficient compared to that of smooth surface tube, thus has larger encomic benifit for condenser design. The condensation heat transfer coefficient was shown to increase as the fin-pitch of the pin-finned tube decreases for film Reynolds number larger than 100.
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