대한기계학회논문집 (Transactions of the Korean Society of Mechanical Engineers)
- 제18권5호
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- Pages.1264-1274
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- 1994
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- 1225-5963(pISSN)
DOI QR Code
수평 원형전열관의 핀효과에 의한 응축 및 비등 열전달촉진에 관한 연구 (1)-튜브외부 비등-
A Study on the Improvement of Condensation and Boiling Heat Transfer on Horizntal Tube by Fin Effect(l)-Shellside Boiling-
초록
Heat transfer performance of integral-fin tube which is used in recipro turbo refrigerator or high compact heat exchangers is studied. Eight tubes with trapezoidal shaped integral-fins having fin densities from 748 to 1654 fpm and 10, 30 internal grooves are tested. A plain tube having the same(inner and outer) diameter as the fin tubes is also tested for comparison. Pool boiling heat transfer of R-11 is investigated experimentally and theoretically on single tube arrangement. The refrigerant evaporates at saturation state of 1 bar on the outside tube surface and heat is supplied by not water which circulates inside of the tube. From the result of eight fin tubes and one plain tube tested, a tube having 1299 fpm-30 grooves shows the best performance. A maximum overall heat transfer coefficient of this tube is about 4000
키워드