EFFECT OF TUBE INCLINATION ON CONDENSATION HEAT TRANSFER OF R-134A IN MICROFIN TUBE

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AKHAVAN BEHABADI M.A.; MOHSENI S.G.

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Journal: Year:2007 | Volume:40 | Issue:6 (100) Page(s): 781-788

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Title

EFFECT OF TUBE INCLINATION ON CONDENSATION HEAT TRANSFER OF R-134A IN MICROFIN TUBE

Author(s)

AKHAVAN BEHABADI M.A. | MOHSENI S.G. | Issue Writer Certificate

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Abstract

Condensation heat transfer of R-134a inside microfin tube was experimentally investigated. Test condenser was a double pipe counter-flow water cooled heat exchanger which refrigerant flowed inside the internal tube (microfin tube), while water flowed in the annulus. The microfin tube is provided with different tube inclination angles of the direction of fluid flow from horizontal, α. The data are acquired for seven different tube inclinations in a range of -90 to +90 degrees and three mass velocities of 53.73, 80.59, and 107.46 kg / m2-s for the condensation of R- 134a vapor. The experimental results indicated that the tube inclination, α, significantly affected the condensation heat transfer coefficient in microfin tube. These effects increased with reduction in vapour quality and mass velocity so that in low mass velocity and vapour qualities the highest heat transfer coefficient, occurred in α= +30º, is 1.7 time greater than the minimum of heat transfer coefficient in α= -90 º. In addition, it was found that the highest heat transfer coefficient occurs when the microfin tube is horizontal at high vapor qualities and the tube with an inclination of +30 degree at low vapor qualities. The lowest heat transfer coefficient is attained in vertical tube; in high vapor qualities, upward flow has the lowest heat transfer coefficient and in low vapor qualities, the lowest heat transfer coefficient occurs in downward flow.

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APA: Copy

AKHAVAN BEHABADI, M.A., & MOHSENI, S.G.. (2007). EFFECT OF TUBE INCLINATION ON CONDENSATION HEAT TRANSFER OF R-134A IN MICROFIN TUBE. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), 40(6 (100)), 781-788. SID. https://sid.ir/paper/14371/en

Vancouver: Copy

AKHAVAN BEHABADI M.A., MOHSENI S.G.. EFFECT OF TUBE INCLINATION ON CONDENSATION HEAT TRANSFER OF R-134A IN MICROFIN TUBE. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)[Internet]. 2007;40(6 (100)):781-788. Available from: https://sid.ir/paper/14371/en

IEEE: Copy

M.A. AKHAVAN BEHABADI, and S.G. MOHSENI, “EFFECT OF TUBE INCLINATION ON CONDENSATION HEAT TRANSFER OF R-134A IN MICROFIN TUBE,” JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), vol. 40, no. 6 (100), pp. 781–788, 2007, [Online]. Available: https://sid.ir/paper/14371/en

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