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An experimental study on heat transfer and pressure drop characteristics of carbon dioxide during the gas cooling process in a helically coiled tube.
Author(s) : OH H. K., SON C. H., JEON M. J., et al.
Summary
The heat transfer coefficient and pressure drop during the gas cooling process of CO2 (R-744) in a helically coiled copper tube with the inner diameter of 4.55 and outer diameter of 6.35 mm 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 kg/m2.s and the inlet pressures of gas cooler are 7.5 to 10.0 MPa. 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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Pages: ICR07-B2-308
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Details
- Original title: An experimental study on heat transfer and pressure drop characteristics of carbon dioxide during the gas cooling process in a helically coiled tube.
- Record ID : 2008-0042
- Languages: English
- Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
- Publication date: 2007/08/21
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Indexing
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Themes:
Heat transfer;
CO2 - Keywords: Heat transfer coefficient; Helical tube; Heat transfer; Gas cooler; Expérimentation; Transcritical cycle; Refrigerant; CO2; Pressure drop
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