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Heat transfer characteristics of CO2-oil mixtures.

Author(s) : MÜLLER M., EGGERS R.


Due to environmental reasons the use of carbon dioxide in refrigeration and air conditioning systems has become more and more attractive in recent years. In order to design and optimize the heat exchangers for a CO2 refrigeration cycle, it is necessary to get knowledge of heat transfer characteristics of CO2, and especially of CO2-oil-mixtures, in gas cooler and evaporator. Therefore, heat exchanger characteristics of CO2-oil-mixtures were examined in a transcritical CO2 refrigeration process by using a double-pipe heat exchanger (inner diameter: 9.4 mm). While the oil concentration of the flow was varied, local heat transfer coefficients in gas cooler and evaporator were determined. Especially for mobile devices, the use of microchannel heat exchangers as gas cooler and evaporator might be an interesting option to reduce weight and size. Hence, further experiments by using microchannel heat exchangers (channel width: 200 micrometers, channel height: 100 micrometers) as gas cooler and evaporator were carried out and compared with the previous results.

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Pages: 2008-2


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  • Original title: Heat transfer characteristics of CO2-oil mixtures.
  • Record ID : 2009-0037
  • Languages: English
  • Source: 8th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2008)
  • Publication date: 2008/09/07


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