International Journal

Comparative evaluation of the evaporation heat transfer characteristics of a low-GWP refrigerant R-1234ze(E) between shell-and-plate and plate heat exchangers
Year of publication 2020
Title of paper Comparative evaluation of the evaporation heat transfer characteristics of a low-GWP refrigerant R-1234ze(E) between shell-and-plate and plate heat exchangers
Author ChangUk Jo, DongChan Lee, Hyun Joon Chung, Yubi Kang, Yongchan Kim
Publication in journal International Journal of Heat and Mass Transfer
Publication date June 2020
Volume & other data Volume 153, 119598
Abstract In this study, the evaporation heat transfer characteristics of R-1234ze(E) in a shell-and-plate heat ex￾changer (SPHE) and plate heat exchanger (PHE) are measured and analyzed by varying the mass flux, saturation temperature, heat flux, and vapor quality. The evaporation heat transfer coefficients of the SPHE and PHE are highly affected by the mass flux, but are hardly influenced by the saturation tempera￾ture. The evaporation heat transfer coefficient of the PHE decreases rapidly at high vapor qualities due to dry-out, while that of the SPHE remains constant even at high vapor qualities due to a large liquid pool. The two-phase frictional pressure drops in the SPHE and PHE are strongly influenced by the mass flux and saturation temperature. In addition, the heat transfer characteristics of R-1234ze(E) in the SPHE and PHE are compared in terms of the enhancement and penalty factors. Furthermore, empirical correlations of the Nusselt number and two-phase friction factor are developed using dimensionless parameters.
Keywords R-1234ze(E), Evaporation heat transfer, Two-phase pressure drop, Shell-and-tube heat exchanger, Plate heat exchanger
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