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Discrete modeling of fin-tube heat exchangers accounting for cross-fin conduction.

Number: pap. n. 1721

Author(s) : SARFRAZ O., BACH C. K., BRADSHAW C. R.

Summary

Heat exchanger coil models are a critical component for developing a predictive simulation platform which allows for model-based design of new equipment. Most residential and commercial heating, ventilation, and air-conditioning (HVAC) systems utilize fin-tube heat exchanger coils. Many of the current state-of-the-art heat exchanger models do not include cross-fin conduction and struggle with predictive accuracy of these coils under non-uniform flow and especially with large temperature difference between adjacent tubes. This paper presents a segment-by-segment model of a fin-tube heat exchanger that includes cross-fin conduction between all adjacent tube segments through the fins (e.g. cross-fin conduction). The physics of the model also accounts for both refrigerant and air phase transitions as well as the ability to account for air and refrigerant maldistribution. The model’s predictions are compared against experimental results collected on an industrial heat exchanger test facility for an air-to-water heat exchanger. A preliminary set of results confirm that cross-fin conduction accounts for large discrepancies in predicted coil performance, particularly with large temperature differences in walls of adjacent tubes.

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Pages: 8

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Details

  • Original title: Discrete modeling of fin-tube heat exchangers accounting for cross-fin conduction.
  • Record ID : 30026800
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.1721

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