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Evaporative Heat Transfer Characteristics of Carbon Dioxide in a Horizontal Tube  

Son Chang-Hyo (부경대학교 냉동공학과)
Lee Dong-Gun (부경대학교 냉동공학과)
Kim Young-Lyoul (한국생산기술연구원 신에너지환경팀)
Oh Hoo-Kyu (부경대학교 냉동공학과)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.16, no.12, 2004 , pp. 1134-1139 More about this Journal
Abstract
The evaporative heat transfer coefficient of $CO_2$ (R-744) in a horizontal tube was investigated experimentally. The experiments were conducted without oil in a closed refrigerant loop which was driven by a magnetic gear pump. The main components of the refrigerant loop are a receiver, a variable-speed pump, a mass flow meter, a pre-heater and evaporator (test section). The test section consists of a smooth, horizontal stainless steel tube of inner diameter of 7.75 mm. The experiments were conducted at mass flux of 200 to 500 kg/m$^2$s, saturation temperature of -5 to 5$^{\circ}C$, and heat flux of 10 to 40kW/m$^2$. The test results showed the heat transfer of $CO_2$ has a greater effect on nucleate boiling more than convective boiling. Mass flux of $CO_2$ does not affect nucleate boiling too much, and the effect of mass flux on evaporative heat transfer of $CO_2$ is much smaller than that of refrigerant R-22 and R-134a. In comparison with test results and existing correlations, correlations failed to predict the evaporative heat transfer coefficient of $CO_2$, therefore, it is necessary to develope reliable and accurate predictions determining the evaporative heat transfer coefficient of $CO_2$ in a horizontal tube.
Keywords
Evaporation; Heat transfer coefficient; Supercritical cycle;
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