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Flow boiling heat transfer and pressure drop for pure refrigerant R290 and R290/oil mixture In horizontal small-diameter tubes.

Number: pap. D2-124

Author(s) : SAITOH S., TANAKA C., HOSHIKA K., et al.

Summary

The flow boiling heat transfer characteristics of refrigerant R290 (propane) and R290/oil mixture in horizontal small-diameter tubes with inner diameters of 1, 2, and 4 mm were experimentally investigated. The local heat transfer coefficient and pressure drop were measured at heat fluxes of 12–24 kW/m2, mass fluxes of 150–300 kg/m2.s, and an evaporating temperature of 288.15 K. The results show that the local heat transfer coefficient at pre-dryout region increased with the vapor quality, indicating that the heat transfer was dominated by forced convection. The increase tendency of heat transfer coefficient with vapor quality became more remarkable as the tube diameter decreased. The heat transfer coefficient for pure R290 was found 1–3 times higher than for R134a. A new correlation was proposed for the prediction of heat transfer coefficient. With increasing oil concentration, in a low quality region, heat transfer coefficient first decreased and then increased afterwards, whereas it decreased monotonously in a high quality region. For pressure drop of R290/oil mixture, oil concentration of 4 wt% caused about a 40% increase compared with the pressure drop of pure refrigerant. The measured pressure drop for pure refrigerant was compared with the prediction of the Lockhart-Martinelli correlation.

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Pages: 11 p.

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Details

  • Original title: Flow boiling heat transfer and pressure drop for pure refrigerant R290 and R290/oil mixture In horizontal small-diameter tubes.
  • Record ID : 30005397
  • Languages: English
  • Source: ACRA2010. Asian conference on refrigeration and air conditioning: Tokyo, Japan, June 7-9, 2010.
  • Publication date: 2010/06/07

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