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A heat exchanger model that includes axial conduction, parasitic heat loads, and property variations.

Author(s) : NELLIS G. F.

Type of article: Article

Summary

The paper presents a numerical model of a heat exchanger in which all the effects are explicitly modelled. The governing equations are derived, nondimensionalized, discretized, and solved on an exponentially distributed grid. The resulting numerical model is simple to implement and computationally efficient and can therefore easily be integrated into complex system models. The numerical model is validated against analytical solutions in the appropriate limits and then used to investigate the effect of heat exchanger end conditions (adiabatic vs fixed temperature) and radiation parasitics. The numerical model, which explicitly considers the combined effect of several loss mechanisms as they interact, is compared to simple models that consider these effects separately. Finally, the model is applied to an example heat exchanger core under a specific set of operating conditions in order to demonstrate its utility.

Details

  • Original title: A heat exchanger model that includes axial conduction, parasitic heat loads, and property variations.
  • Record ID : 2005-0102
  • Languages: English
  • Source: Cryogenics - vol. 43 - n. 9
  • Publication date: 2003/09

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