Experimental study of evaporation heat transfer characteristics and pressure drops of R410A and R134a in a multiport mini-channel

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Publication Details

Author list: Kaew-On J., Wongwises S.

Publisher: Hindawi

Publication year: 2009

Issue number: PART A

Start page: 581

End page: 588

Number of pages: 8

ISBN: 9780791843499

ISSN: 0146-9428

eISSN: 1745-4557

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-77952909973&doi=10.1115%2fICNMM2009-82209&partnerID=40&md5=6636c17cc78029026c318da340b53b04

Languages: English-Great Britain (EN-GB)

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Abstract

The evaporation heat transfer coefficients and pressure drops of R-410A and R-134a flowing through a horizontal-aluminium rectangular multiport mini-channel having a hydraulic diameter of 3.48 mm are experimentally investigated. The test runs are done at refrigerant mass fluxes ranging between 200 and 400 kg/m2s. The heat fluxes are between 5 and 14.25 kW/m 2, and refrigerant saturation temperatures are between 10 and 30ฐC. The effects of the refrigerant vapour quality, mass flux, saturation temperature and imposed heat flux on the measured heat transfer coefficient and pressure drop are investigated. The experimental data show that in the same conditions, the heat transfer coefficients of R-410A are about 20-50 % higher than those of R-134a, whereas the pressure drops of R-410A are around 50-100 % lower than those of R-134a. The new correlations for the evaporation heat transfer coefficient and pressure drop of R-410A and R-134a in a multiport mini-channel are proposed for practical applications. Copyright ฉ 2009 by ASME.

Keywords

Multiport mini-channel, R-410A, R-134a