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The heat transfer coefficient and pressure drop during gas cooling process of CO₂ (R744) in a helically coiled copper tube with the inner diameter of 4.55 ㎜ and outer diameter of 6.35 ㎜ were investigated experimentally. The main components of the refrigerant loop are a receiver, a variable-speed pump, a mass flow meter, a pre-heater and a helically coiled type gas cooler (test section). The refrigerant mass fluxes are varied from 200 to 800 ㎏/㎡s and the inlet pressures of gas cooler are 7.5 to 10.0 ㎫. The heat transfer coefficients of CO₂ in a helically coiled tube are higher than those in a horizontal tube. The pressure drop of CO₂ in the gas cooler shows a relatively good agreement with those predicted by Ito’s correlation developed for single-phase in a helically coiled tube. The local heat transfer coefficient of CO₂ agrees well with the correlation by Pitla et al. However, at the region near pseudo-critical temperature, the experiments indicate higher values than the Pitla et al. correlation. Therefore, various experiments in helically coiled tubes have to be conducted and it is necessary to develop the reliable and accurate prediction determining the heat transfer and pressure drop of CO₂
in a helically coiled tube.

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Abstract
1. Introduction
2. Experimental Apparatus and Methods
3. Results and Discussion
4. Conclusion
Acknowledgements
Reference
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UCI(KEPA) : I410-ECN-0101-2009-559-016692158