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Dynamic modeling of air source heat pumps under reverse-cycle defrosting.

Number: 2190

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

Summary

One of the biggest challenges associated with air source heat pump units is the performance degradation and inefficiency due to frost accumulation on the outdoor coil surface. The continued buildup of frost eventually necessitates a defrosting mode to remove the accumulated frost and return the system to its normal operating characteristics. Dynamic modeling of a defrost cycle is extremely useful in development and evaluation of improved defrost control designs. Most of the previous modeling studies solely focused on the heat and mass transfer characteristics on the air
side neglecting the corresponding dynamics of the reverse refrigerant flow and have not considered complete transient systems simulations with experimental validations. In this work, a comprehensive dynamic modeling framework is presented to investigate the transient characteristics of a residential heat pump under reverse-cycle defrosting operations. A smooth transition scheme is applied to the frost melting model, which is typically described by multi-stage sub-models, to improve model robustness. A transient simulation is conducted, and results are compared against measurement data for a residential heat pump unit. The model presented can be used to conduct performance evaluations of the defrosting cycle, as well as energy assessments for comparisons of different defrost strategies.

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Pages: 10 p.

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Details

  • Original title: Dynamic modeling of air source heat pumps under reverse-cycle defrosting.
  • Record ID : 30030602
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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