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Experimental study on boiling heat transfer of R410A without lubricant oil in the inner-grooved copper tubes.

[In Chinese. / En chinois.]

Author(s) : LIU R., TAO L., GAO L., et al.

Type of article: Article

Summary

ln order to establish test-bench without oil, hydraulic diaphragm pumps are used for the power cycle in this study. The boiling heat transfer of environmentally friendly refrigerant R41OA and R22 as working fluids in the horizontal and innergrooved copper tubes (phi 5 mm and phi 9.52 mm) were investigated experimentally, and the boiling heat transfer performance of the two refrigerant was compared. The effect of refrigerant mass flow rate, changes of , external water flow rate and diameter of tubes on the pressure drop and heat transfer coefficient are analyzed. Experimental results show that heat transfer coefficient increases with the increase of water flow rate, and the size of diameter has greater impact on the heat transfer coefficient. In the same flow rate, heat transfer coefficient of the 9. 52 mm tube is 1.32~7.22 times as the 5 mm tube.

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Pages: 20-24

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Details

  • Original title: [In Chinese. / En chinois.]
  • Record ID : 30003108
  • Languages: Chinese
  • Source: Journal of Refrigeration - n. 140
  • Publication date: 2011/08

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