An experimental study on the evaporative heat transfer characteristics of R-134a in a micro-channel heat exchanger
- Authors
- Lee, H.; Jeon, D.-S.; Kim, Y.-L.; Kim, Y.; Kim, S.-C.
- Issue Date
- 2010
- Keywords
- Diffusion bonding; Evaporative heat transfer coefficient; Micro-channel; Printed circuit heat exchanger
- Citation
- Transactions of the Korean Society of Mechanical Engineers, B, v.34, no.2, pp.113 - 120
- Indexed
- SCOPUS
KCI
- Journal Title
- Transactions of the Korean Society of Mechanical Engineers, B
- Volume
- 34
- Number
- 2
- Start Page
- 113
- End Page
- 120
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/118352
- DOI
- 10.3795/KSME-B.2010.34.2.113
- ISSN
- 1226-4881
- Abstract
- An experimental investigation was carried out to examine the evaporative heat transfer characteristics of R-134a in a micro-channel heat exchanger. The micro-channel heat exchanger used in this study was a sort of plate heat exchanger. Micro-channels were fabricated on the SUS304 plate by the photo-etching process: 13 sheets of plates were stacked and bonded by the diffusion bonding process. The effects of the evaporating temperature, mass flux of R-134a, and inlet temperature of water were examined. As the difference between the inlet temperatures of R-134a and water increased, the heat transfer rate increased. The evaporative heat transfer coefficients obtained in this study range from 0.67 to 6.23 kW/m2-°C. The experimental correlation for the Nusselt number as a function of the Reynold number and θ was suggested for the micro-channel heat exchanger.
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