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Study on $CO_2$ Evaporation Heat Transfer and Pressure Drop in a Horizontal Smooth Tube  

Lee, Sang-Jae (Department of Mechanical Engineering, Graduate School Hanyang University)
Choi, Jun-Young (Korea Testing Laboratory)
Lee, Jae-Heon (Department of Mechanical Engineering, Hanyang University)
Kwon, Young-Chul (Department of Mechanical Engineering, Sunmoon University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.19, no.9, 2007 , pp. 615-621 More about this Journal
Abstract
Experimental study on the heat transfer characteristics of $CO_2$ in a horizontal smooth tube was carried out to investigate the heat transfer coefficient and pressure drop during evaporation of $CO_2$. The experiment apparatus consisted of a test section, a DC power supply, a heater, a chiller, a mass flow meter, a pump and a measurement system. Experiment was conducted for various mass fluxes ($200{\sim}1200kg/m^2s$), heat flukes ($10{\sim}100kW/m^2$) and saturation temperatures (-5, 0, $5^{\circ}C$). With increasing the heat flux, the evaporation heat transfer coefficient increased. But the variation of the heat transfer coefficient on the increase of the mass flux was not large. And the significantly drops of the heat transfer coefficient was observed at any heat flux and mass flux because of the change of the flow pattern in the tube. With increasing the saturation temperature, the heat transfer coefficient increased due to the promotion of a nucleate boiling. The measured pressure drop during evaporation increased with increasing the mass flux and decreasing the saturation temperature.
Keywords
Evaporation; Heat transfer; $CO_2$; Quality; Pressure drop;
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  • Reference
1 Zhao, Y, Ohadi, M. M., Dessiatoun, S. V., Schuster, A, McNair, A., Radermacher, R. and Darabi, J., 1997, Evaporation heat transfer coefficients of ammonia and CO2 inside a smooth tube. IIF-IIR Commission B1 , with E1&E2, College Park, MD, pp. 116-130
2 Cho, Y S., 2000, An experimental study on the characteristics of evaporative heat transfer of carbon dioxide., M.S. thesis, National University of Seoul, Seoul, Korea
3 Hihara, E. and Tanaka, S., 2000, Boiling heat transfer of carbon dioxide in horizontal tubes. Preliminary proceedings of the 4th IIR-Gustav Lorentzen conference on natural working fluids at Purdue. pp, 279-284
4 Lorentzen, G. and Pettersen, J, 1992, A new, efficient and environmentally benign system for car air-conditioning, International Journal Refrigeration, Vol. 16, No.1, pp.4-12
5 Hwang, Y, 1997, Comprehensive investigation of carbon dioxide refrigeration cycle, Ph.D. thesis, University of Maryland, Maryland, USA
6 Lorentzen, G., 1995, The use of natural refrigerants : a complete solution to the CFC/ HCFC predicament., International Journal Refrigeration, Vol. 18, No.3, pp.190-197   DOI   ScienceOn
7 Yoon, S. H., 2002, Studies on the char-acteristics of evaporation and supercritical gas cooling heat transfer of carbon dioxide., Ph.D. thesis, National University of Seoul, Seoul, Korea
8 Yun, L., 2003, Convective boiling of carbon dioxide in mini tubes and micro-channels, Ph.D. thesis, University of Korea, Seoul, Korea
9 Son, C. H., 2004, Heat transfer characteristics of supercritical cycle of carbon dioxide in a horizontal tube, Ph.D. thesis, National University of Pukyong, Pusan, Korea