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Single-phase heat transfer and pressure drop performance in smooth tubes with R22, R134a, R407C, and R410A at superheated conditions with lubricant mixtures (RP-1067).

Author(s) : ECKELS S. J., HOLTHAUS G. D.

Type of article: Article

Summary

The objective of the study is to document the heat transfer and pressure drop phenomena of selected refrigerants in a superheated state with lubricant mixtures. Refrigerants used in the study included R22, R134a, R407C, and R410A. The paper presents the smooth tube results over a Reynolds number range of 100 000 to 1 000 000, with lubricant concentrations ranging from 0 to 5% by mass. The refrigerant saturation temperature was maintained at 40 °C, which would be common for the inlet of a condenser. The results show that even small additions of lubricant cause significant increases in pressure drop. The lubricant also causes a less dramatic increase in the heat transfer coefficients. Models are proposed to allow prediction of superheated refrigerant and lubricant mixture performance.

Details

  • Original title: Single-phase heat transfer and pressure drop performance in smooth tubes with R22, R134a, R407C, and R410A at superheated conditions with lubricant mixtures (RP-1067).
  • Record ID : 2005-2490
  • Languages: English
  • Source: HVAC&R Research - vol. 10 - n. 4
  • Publication date: 2004/10

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