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Study on flow and heat transfer characteristics of supercritical carbon dioxide cooled with different types of lubricating oil.

Number: pap. n. R27, 2491

Author(s) : DANG C., HOSHIKA K., HIHARA E., et al.

Summary

In this research, we studied the effects of lubricating oil on the heat transfer performance of supercritical carbon dioxide by applying three different lubricants: polyalkylene glycol (PAG), polyvinyl ether (PVE), and PAG-PVE copolymer (ECP). The heat transfer coefficient measurement and the flow pattern visualization were conducted using a horizontal smooth tube with inner diameter of 2 mm at pressures ranging from 8 to 10 MPa and mass fluxes from 800 to 1200 kg m-2s-1. The compatibility of the lubricants with supercritical CO2 was found to have a remarkable influence on the heat transfer coefficient. Changes in the flow patterns of CO2 mixed with the three different oils are observed with increasing temperature as a result of the different properties of the oils. For the lubricant in which CO2 has the highest solubility, i.e., PVE, the oil film does not form at temperatures lower than the pseudocritical temperature, and the heat transfer coefficient does not greatly change with oil concentration. At higher temperatures, a decrease in the heat transfer coefficient with increasing oil concentration was observed for all three lubricants because of the formation of an oil film. ECP is inferior to PVE but provides better heat transfer characteristics than PVG.

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Pages: 8 p.

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Details

  • Original title: Study on flow and heat transfer characteristics of supercritical carbon dioxide cooled with different types of lubricating oil.
  • Record ID : 30000996
  • Languages: English
  • Source: 2010 Purdue Conferences. 13th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2010/07/12

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