Investigation of refrigerant R134a two phase flow heat transfer in vertical heat exchanger channel
Joint Authors
Hamad, Ahmad J.
Ibrahim, Abd Allah Adil
Faraj, Juhayn Jawdat
Source
Issue
Vol. 14, Issue 4 (31 Dec. 2019), pp.1-27, 27 p.
Publisher
University of Thi-Qar Research and Development Department
Publication Date
2019-12-31
Country of Publication
Iraq
No. of Pages
27
Main Subjects
Topics
Abstract EN
Two phase flow boiling heat transfer and pressure drop in the vertical evaporator tube section of refrigeration system have been experimentally investigated using refrigerant R134a as a working fluid.
The objective of the present work is to investigate experimentally the effect of heat flux, mass flux, vapor quality and saturation temperature on refrigerant flow boiling heat transfer characteristics in the evaporator of refrigeration system.
These investigated parameters have significant impacts to enhance the thermal performance of the evaporator.
The experimental investigations were conducted in smooth copper tube with inner diameter 5.8 mm and 600 mm length under different test conditions.
The test conditions considered in this study were, for heat flux of 7.718-32.78 kW/m2 , mass flux of 97.3-148.7 kg/m2 .s , saturation temperature of - 20.58 to -15.68 ˚C and vapor quality of 0.3-1.
It can be concluded from the results that, the average heat transfer coefficient at relatively greater mass flux 148.7 kg/m2 .s was higher in range of 21% compared to other mass fluxes at constant test conditions.
The relatively higher value of heat transfer coefficient was observed at heat flux 32.78 kW/m2 with average increase of 19% compared to the relatively lower value 23.38 kW/m2 .
The enhancement in local heat transfer coefficient at saturation temperature - 15.68˚C was higher by about 12% than that for the relatively lower temperature -20.58˚C.
The effect of increase in mass flux and heat flux on pressure drop in the evaporator tube was about 9% and 7.5% respectively.
American Psychological Association (APA)
Ibrahim, Abd Allah Adil& Hamad, Ahmad J.& Faraj, Juhayn Jawdat. 2019. Investigation of refrigerant R134a two phase flow heat transfer in vertical heat exchanger channel. University of Thi-Qar Journal،Vol. 14, no. 4, pp.1-27.
https://search.emarefa.net/detail/BIM-1103600
Modern Language Association (MLA)
Ibrahim, Abd Allah Adil…[et al.]. Investigation of refrigerant R134a two phase flow heat transfer in vertical heat exchanger channel. University of Thi-Qar Journal Vol. 14, no. 4 (Dec. 2019), pp.1-27.
https://search.emarefa.net/detail/BIM-1103600
American Medical Association (AMA)
Ibrahim, Abd Allah Adil& Hamad, Ahmad J.& Faraj, Juhayn Jawdat. Investigation of refrigerant R134a two phase flow heat transfer in vertical heat exchanger channel. University of Thi-Qar Journal. 2019. Vol. 14, no. 4, pp.1-27.
https://search.emarefa.net/detail/BIM-1103600
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 26-27
Record ID
BIM-1103600