Cooling and condensation heat transfer of a refrigerant at high pressures in a chevron-type plate heat exchanger

Yuki Yamasaki, Naoto Watanabe, Kazushi Miyata, Hideo Mori, Yoshinori Hamamoto, Shuichi Umezawa, Katsuhiko Sugita

Research output: Contribution to conferencePaperpeer-review

Abstract

In industrial fields, heat source over 130°C are widely needed, and for this development of industrial high-temperature heat pump systems has been promoted. For the heat release process in such the heat pump systems, it is considered to use of a plate heat exchanger (PHE) in which a high pressure working refrigerant flows. In this study, to examine the effect of chevron angle on the heat transfer of refrigerants at supercritical pressures and high subcritical pressures flowing in the chevron PHEs, experiments were conducted using a chevron PHE with a chevron angle 75°. The measured heat transfer coefficients were compared with the data of the three chevron PHEs with respective chevron angles 30°, 47.5° and 65° obtained previously. At a supercritical pressure, cooling heat transfer coefficient of the 75° PHE is somewhat higher than the 65° PHE at liquid-like low enthalpy region and almost the same at vapor-like high enthalpy region. While at a high subcritical pressure, condensation heat transfer coefficient of the 75° PHE is slightly higher but almost the same with the 65° PHE. From the results, the effect of chevron angle on the heat transfer at 65° and more is recognized but it is considered to be smaller than that at less than 65°. Besides, the pressure drop of the 75° PHE is markedly larger than that of the 65° PHE.

Original languageEnglish
Pages773-777
Number of pages5
Publication statusPublished - 2020
Event7th International Conference on Power Engineering, ICOPE 2019 - Kunming, China
Duration: Oct 21 2019Oct 25 2019

Conference

Conference7th International Conference on Power Engineering, ICOPE 2019
CountryChina
CityKunming
Period10/21/1910/25/19

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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