Abstract
Condensation heat transfer coefficients (HTCs) of HCFC22, HCFC123, HFC134a and HFC245fa are measured on a horizontal plain tube 19.0 mm outside diameter. All data are taken at the vapor temperature of 39°C with a wall subcooling temperature of 3–8°C. Test results show the HTCs of newly developed alternative low vapor pressure refrigerant, HFC245fa, on a smooth tube are 9.5% higher than those of HCFC123, while they are 3.3% and 5.6% lower than those of HFC134a and HCFC22, respectively. Nusselt’s prediction equation for a smooth tube underpredicts the measured data by 13.7% for all refrigerants, while a modified equation yielded 5.9% deviation against all measured data. From the view point of environmental safety and condensation heat transfer, HFC245fa is a long-term good candidate to replace HCFC123 used in centrifugal chillers.
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This paper was recommended for publication in revised form by Associate Editor Yong Tae Kang
Ki-Jung Park received Ph.D. degree in mechanical engineering from Inha University in 2009. He was a postdoctoral fellow at Inha University. He is currently a guest researcher at National Institute of Standards and Technology(NIST). His primary research interests are refrigeration and heat pumping system design and experimental two phase heat transfer.
Dongsoo Jung is currently a professor in mechanical engineering at Inha University. His primary research interests are refrigeration and heat pumping system design and experimental two phase heat transfer.
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Park, KJ., Kang, D.G. & Jung, D. Condensation heat transfer coefficients of HFC245fa on a horizontal plain tube. J Mech Sci Technol 24, 1911–1917 (2010). https://doi.org/10.1007/s12206-010-0611-1
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DOI: https://doi.org/10.1007/s12206-010-0611-1