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Defrost model with frost distribution on surface considered.

Number: 2433

Author(s) : CHEN J., TANG K., WANG S.

Summary

The defrosting process is essential for maintaining the Coefficient of Performance (COP) of heat pumps during cold winter days. Reverse cycle is a commonly used approach for heat pump defrosting. However, without an appropriate defrosting control strategy, this method can lead to significant energy waste and incomplete defrosting can decrease COP during heat pump mode. To resolve this issue, we developed a defrost model that predicts the defrosting process and can be used to optimize the control strategy of defrosting process. This model incorporates detailed analysis of fin-tube geometry and frost distribution along the airflow direction, enabling accurate predictions of both defrosting time and energy consumption for individual fin-tube elements. Compared to conventional 1-D models, our defrosting model significantly increases accuracy by considering the complex fin-tube geometry. Additionally, it provides insights into how extra defrosting can lead to excessive energy wastage emphasizing the importance of optimizing defrost strategies to improve defrosting efficiency.

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Pages: 10 p.

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Details

  • Original title: Defrost model with frost distribution on surface considered.
  • Record ID : 30033128
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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