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Measurement of oil circulation ratio in CO2 heat pump systems with immiscible oil.

Number: pap. ID: 693

Author(s) : GAO L., NAKAMURA A., HONDA T., et al.

Summary

This paper deals with several measurement methods for oil circulation ratio (OCR) in CO2 heat pump systems in which immiscible oil (PAG) is used. The visual or oil-droplet method (OCR measurement method by measuring the numbers of oil droplets and the time required) proposed by Gao and Honda, was modified for higher mass velocities and higher OCR conditions. The results agree well with those measured by the oilvolume method (OCR measurement method by measuring the oil-volume and the time required). The heat balance method for measuring OCR was also proposed, and the results show that the method is reliable for high OCR conditions although the accuracy was about ± 1 mass%. Measurement of oil concentration using the densimeter method was also conducted, and results showed that oil concentration is different with OCR in a system with immiscible oil.

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Pages: 8 p.

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Details

  • Original title: Measurement of oil circulation ratio in CO2 heat pump systems with immiscible oil.
  • Record ID : 30002077
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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