Experimental investigation of evaporation heat transfer coefficient and pressure drop of R-410A in a multiport mini-channel Jatuporn Kaew-On a,b , Somchai Wongwises b, * a The joint Graduate School of Energy and Environment, King Mongkut’s University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand b Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department of Mechanical Engineering, King Mongkut’s University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand article info Article history: Received 20 March 2008 Received in revised form 17 June 2008 Accepted 29 June 2008 Published online 9 July 2008 Keywords: Heat exchanger Microchannel Experiment Heat transfer Evaporation Pressure drop R-410A abstract The evaporation heat transfer coefficient and pressure drop of R-410A flowing through a horizontal aluminium rectangular multiport mini-channel having 3.48 mm hydraulic diameter are experimentally investigated. The test runs are performed at mass flux ranging between 200 and 400 kg/m 2 s. The heat fluxes are between 5 and 14.25 kW/m 2 and the satu- ration temperatures range between 10 and 30  C. The pressure drop across the test section is directly measured by a differential pressure transducer. The effects of the imposed wall heat flux, mass flux, vapour quality, and saturation temperature on the evaporation heat transfer and pressure drop are also discussed. The results from the present experiment are compared with those obtained from the existing correlation. New correlations for the evaporation heat transfer coefficient and pressure drop of R-410A flowing through a multi- port mini-channel are proposed for practical applications. ª 2008 Elsevier Ltd and IIR. All rights reserved. Coefficient de chaleur et chute de pression lors de l’e ´ vaporation de R-410A dans un minicanal a ` plusieurs orifices : e ´ tude expe ´ rimentale Mots cle ´s : E ´ changeur de chaleur ; Microcanal ; Expe ´ rimentation ; Transfert de chaleur ; E ´ vaporation ; Chute de pression ; R-410A * Corresponding author. Tel.: þ66 2 470 9115; fax: þ66 2 470 9111. E-mail address: somchai.won@kmutt.ac.th (S. Wongwises). www.iifiir.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/ijrefrig 0140-7007/$ – see front matter ª 2008 Elsevier Ltd and IIR. All rights reserved. doi:10.1016/j.ijrefrig.2008.06.010 international journal of refrigeration 32 (2009) 124–137