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Incorporating a frost growth model with segment by segment heat exchanger simulation - application to microchannel heat exchanger.

Number: pap. n. R21, 2419

Author(s) : PADHMANABHAN S., FISHER D. E., CREMASCHI L.

Summary

A transient frost model based on scaling approach is developed which can be applied to microchannel heat exchangers. The model is able to predict the thickness of the frost layer and the mass accumulation. The model is also capable of handling the air redistribution that occurs on outdoor coils where frost develops non-uniformly. The frost model is integrated with a segment-by-segment heat exchanger calculation algorithm and is validated against experimental data for different entering fluids temperatures. Model results are compared to measured values of frost thickness and are found to match well for all the cases. Model prediction and experimental measurements both showed that frost grows faster when the temperature is lower. Ignoring the phenomenon of air redistribution was found to result in significant errors in predicted coil capacity. The rate of capacity drop in a microchannel heat exchanger during frosting is high and almost linera though out the period. The rate also increased as the temperature of surface was lowered. In order to solve the redistribution to a greater accuracy, effect of geometry of frost layer in the direction of air flow need to be considered.

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Pages: 8 p.

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Details

  • Original title: Incorporating a frost growth model with segment by segment heat exchanger simulation - application to microchannel heat exchanger.
  • Record ID : 30000971
  • Languages: English
  • Source: 2010 Purdue Conferences. 13th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2010/07/12

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