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Experimental study on flow boiling of R134a and R410A in a horizontal microfin tube at high saturation temperatures.

Author(s) : PADOVAN A., DEL COL D., ROSSETTO L.

Type of article: Article

Summary

This paper presents an experimental study on vaporization of R134a and R410A inside a horizontal microfin tube at 30°C and 40°C saturation temperatures. A wide range of operating conditions is investigated: mass flux from 80 to 600 kg m-2 s-1, heat flux from 14 to 83.5 kW m-2 and vapour quality from 0.1 to 0.99. The experimental database includes measurements of heat transfer coefficient and dryout inception vapour quality. The heat transfer data are compared with those for a plain tube at similar operating conditions. The experimental data are then used to assess the accuracy of models for the prediction of the heat transfer coefficient and dry-out vapour quality. The present data are measured at high evaporating temperature, covering values of reduced pressure between 0.19 and 0.49, which are higher than usual for air-conditioning applications with halogenated refrigerants. The main applications for the present study are related to heat pumps reaching high condensing temperature (above 70°C) and high evaporating temperature (above 30 °C), although other applications of evaporators operating at high reduced pressure may also benefit from the present data.

Details

  • Original title: Experimental study on flow boiling of R134a and R410A in a horizontal microfin tube at high saturation temperatures.
  • Record ID : 30006277
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 31 - n. 17-18
  • Publication date: 2011/12
  • DOI: http://dx.doi.org/10.1016/j.applthermaleng.2011.07.026

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