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Evaluation of various compressor lubricants for a carbon dioxide heat pump system.

Author(s) : IKEDA H., YAGI J. I., KAWAGUCHI Y.

Summary

Due to increasing global environmental concerns, carbon dioxide (CO2), a type of natural gas, is being considered as an alternative refrigerant for automotive air-conditioning systems. Additionally, CO2 is considered an alternative heat transfer fluid for heat pump systems. The chemical and physical properties (lubricity, chemical stability, miscibility, mixture viscosity and other properties.) of possible base oils for a CO2 refrigeration lubricant are evaluated. These base oils included PAG (polyalkylene glycol), PVE (polyvinyl ether), POE (polyol ether) and PC (polycarbonate). It was found that PAG was the best lubricant for a CO2 heat pump system. This is because of its suitable miscibility, higher chemical stability and better lubricity under high pressure. Newly developed refrigeration lubricants using PAG have been successfully introduced into the market for CO2 heat pump water heater systems and CO2 automotive A/C systems.

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Pages: 2004-2

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Details

  • Original title: Evaluation of various compressor lubricants for a carbon dioxide heat pump system.
  • Record ID : 2005-2244
  • Languages: English
  • Source: Natural Working Fluids 2004: 6th IIR-Gustav Lorentzen Conference
  • Publication date: 2004/08/01

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