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An experimentally validated model for microchannel heat exchanger incorporating lubricant effect.

Number: pap. 2148

Author(s) : LI H., HRNJAK P.

Summary

In this study, a microchannel heat exchanger model is developed in which the thermodynamic and transport properties of refrigerant-oil mixture are taken into account as well as their impact on boiling heat transfer and pressure drop. A newly proposed infrared thermography based method is implemented in the model to describe the quality distribution in the inlet header instead of an empirical correlation. The new model is validated against experimental results (R134a-PAG 46 oil) at various oil circulation rates (0.1%-8.3%). The agreement between measurement and prediction is ±4% for capacity, ±10% for pressure drop and ±3°C for superheat at compressor inlet. Simulation results also indicate that lubricant addition improves refrigerant distribution and the infrared thermography based method enables the model to fully capture lubricant effect on capacity.

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Pages: 9 p.

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Details

  • Original title: An experimentally validated model for microchannel heat exchanger incorporating lubricant effect.
  • Record ID : 30013573
  • Languages: English
  • Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2014/07/14

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