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Experimental and theoretical investigation of heat transfer coefficient for boiling of the isobutane/compressor oil solution flow in a pipe.

Number: pap. ID87

Author(s) : ZHELEZNY V. P., CHEN G. M., SHESTOPALOV K. O., et al.

Summary

Experimental results of local heat transfer coefficients for the boiling of real working fluids (solutions of R600a with mineral naphthenic oil ISO VG 15) in smooth tube with small diameter (5.4 mm) are presented. The tests were carried out for the inlet pressure in the range from 62.3kPa to 82.2 kPa, heat flow was 2500-3200 W/m2, and mass velocity of working fluid was from 11.90 to 15.99 kg/(m2s). The oil mass concentrations at the inlet of evaporator varied from 0.29% to 0.35%. The quantitative estimation in reduction of heat transfer coefficient of the wetted surface in evaporator at high oil concentration in the mixture is made. The influence of heat flux and mass velocities of the working fluid on the values of the local heat transfer coefficients are analyzed. The equation for the modeling of the local heat transfer coefficient for boiling of isobutane/compressor oil solution flow in the pipe is suggested.

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Pages: 8 p.

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Details

  • Original title: Experimental and theoretical investigation of heat transfer coefficient for boiling of the isobutane/compressor oil solution flow in a pipe.
  • Record ID : 30012633
  • Languages: English
  • Source: 11th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2014). Proceedings. Hangzhou, China, August 31-September 2, 2014.
  • Publication date: 2014/08/02

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