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Improving robustness of transient heat exchanger models with non-uniform frost formation.

Number: 2586

Author(s) : MA J., KIM D., BRAUN J. E.

Summary

Since frost accumulation is a common but undesired phenomenon for air-source heat pumps in winter operations, transient modeling of such systems with frost buildup on the evaporator coil is significantly useful for improved control designs under frosting conditions. Despite the abundance of modeling studies on heat exchanger behaviors under frosting operations, there still remain challenges on model robustness due to the complicated cycle dynamics coupled with frost dynamics. This paper presents a finite volume heat exchanger model with frost formation integrated into each control volume. A fan model is proposed to capture the air flow redistribution due to non-uniform frost formation on the coil surface, that can avoid solutions of a large nonlinear equation system, to improve the model robustness and numerical efficiency. The developed heat exchanger model is coupled to other component models to complete a heat pump cycle model. Transient simulations are carried out to explore the impact of frost on the system performance, and results are compared against experiment data.

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Pages: 10 p.

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  • Original title: Improving robustness of transient heat exchanger models with non-uniform frost formation.
  • Record ID : 30030784
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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