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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
대한설비공학회 설비공학논문집 설비공학논문집 제14권 제2호
발행연도
2002.2
수록면
175 - 184 (9page)

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Flow Condensation heat transfer coefficients (HTCs) of R12, R22, R32, R123, R125, R134a, R142b were measured experimentally on a horizontal plain tube. The experimental apparatus was composed of three main parts; a refrigerant loop, a water loop and a water-glycol loop. The test section in a refrigerant loop was made of a copper tube of 8.8 ㎜ inner diameter and 1000 ㎜ length respectively. The refrigerant was cooled by passing cold water through an annulus surrounding the test section. All tests were performed at a fixed refrigerant saturation temperature of 40℃ with mass fluxes of 100, 200, 300 ㎏/㎡s. The experimental result showed that flow condensation HTCs increase as the quality, mass flux, and latent heat of condensation increase. At the same mass flux, the HTCs of R32 and R142b were higher than those of R22 by 35~45% and 7~14% respectively while HTCs of R134a and R123 were similar to those of R22. On the other hand, HTCs of R125 and R12 were lower than those of R22 by 28~30% and 15~25% respectively. Finally, a new correlation for flow condensation HTCs was developed by modifying Dobson and Chato's correlation with the latent heat of condensation considered. The correlaton showed an average deviation of 13.1% for all pure fluids data indicating an excellent agreement.

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