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Evaporation heat transfer and pressure drop characteristics of R1234ze(E)/R32 as a function of composition ratio in a brazed plate heat exchanger

Authors
Lee, DongChanKim, DongwooCho, WonheeKim, Yongchan
Issue Date
9월-2019
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Refrigerant mixture; R32; R1234ze(E); Heat transfer; Pressure drop; Plate heat exchanger
Citation
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.140, pp.216 - 226
Indexed
SCIE
SCOPUS
Journal Title
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume
140
Start Page
216
End Page
226
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/62992
DOI
10.1016/j.ijheatmasstransfer.2019.06.004
ISSN
0017-9310
Abstract
This study investigates the evaporation heat transfer coefficient and two-phase frictional pressure drop of refrigerant mixture R1234ze(E)/R32 at various R1234ze(E) composition ratios in a brazed plate heat exchanger. The heat transfer coefficient of R1234ze(E)/R32 shows a concave curve as a function of composition ratio owing to the temperature glide of the mixture, whereas the two-phase frictional pressure drop increases exponentially with respect to the composition ratio. In addition, the averaged evaporation heat transfer characteristics of R32, R1234ze(E)/R32 (85%/15%), and R1234ze(E) are compared by considering the European Union (EU) regulations for global warming potential (GWP). For regulation phase A (GWP > 750), R32 exhibits the best heat transfer performance, whereas for regulation phase B (GWP > 150), R1234ze(E) shows a favorable averaged heat transfer coefficient compared to R410A and R134a. Finally, based on the measured data, correlations for the Nusselt number and two-phase friction factor for R1234ze(E)/R32 are derived as a function of composition ratio using a nonlinear interpolation method with the pre-developed correlations for pure R1234ze(E) and R32. (C) 2019 Elsevier Ltd. All rights reserved.
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