Condensation Heat Transfer Characteristics of R-410A as an Alternative R-22 in the Condenser with Small Diameter Tubes 


Vol. 13,  No. 2, pp. 151-158, Jun.  2007


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  Abstract

An experimental study to investigate the condensing heat transfer characteristics of small diameter horizontal double pipe heat exchangers with R-22 and R-410A was performed. Experimental facility was constructed to calculate and observe HTC(heat transfer coefficients), flow patterns and pressure drop. The main components include a liquid pump, an evaporator, a condenser(test section), a sight-glass, pressure taps and measurement apparatus. Two pipes of different diameters are tested ; One 5.35 mm ID 0.5 mm thick, the other 3.36 mm ID 0.7 mm thick. The mass flow rate ranged from 200 to 500 kg/m2ㆍs and heating capacity were form 1.0 to 2.4 kW. The flow patterns of R-22 and R-410A were observed with a high speed camera through the sight-glass. The tests revealed that HTC of R-410A was higher than that of of R-22 by maximum 5%. Annular pattern was observed for the most cases but stratified flow was also detected when x<0.2. The pressure drop in 3.36 mm ID pipe was higher than that of 5.35 mm by 30~50%. Comparing with previous correlations such as Shah, Fujii and Soliman's Fujii' showed the best good agreement with my data with a maximum deviation of 40%.

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  Cite this article

[IEEE Style]

S. CH, "Condensation Heat Transfer Characteristics of R-410A as an Alternative R-22 in the Condenser with Small Diameter Tubes," Clean Technology, vol. 13, no. 2, pp. 151-158, 2007. DOI: .

[ACM Style]

Son CH. 2007. Condensation Heat Transfer Characteristics of R-410A as an Alternative R-22 in the Condenser with Small Diameter Tubes. Clean Technology, 13, 2, (2007), 151-158. DOI: .

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pISSN : 1598 - 9712
eISSN : 2288 - 0690

한국연구재단 등재학술지