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The evaporation heat transfer coefficient of CO₂ (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 7.75 ㎜ inner diameter. The experiments were conducted at mass flux of 200 to 500 ㎏/㎡s, saturation temperature of -5℃ to 5℃, and heat flux of 10 to 40 ㎾/㎡. The test results showed the evaporation heat transfer of CO₂ has greatly effect on more nucleate boiling than convective boiling. The evaporation heat transfer coefficients of CO₂ are highly dependent on the vapor quality, heat flux and saturation temperature. The evaporation heat transfer coefficient of CO₂ is very larger than that of R-22 and R-134a. In making a comparison between test results and existing correlations, the present experimental data are the best fit for the correlation of Jung et al. But it was failed to predict the evaporation heat transfer coefficient of CO₂ using by the existing correlation. Therefore, it is necessary to develop reliable and accurate predictions determining the evaporation heat transfer coefficient of CO₂ in a horizontal tube.

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Abstract

1. Introduction

2. Experimental Apparatus and Procedures

3. Results and Discussion

4. Conclusions

Nomenclature

Subscripts

Acknowledgement

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UCI(KEPA) : I410-ECN-0101-2009-559-017719594