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Frosting and Defrosting Behavior of Evaporators.

Number: No 088

Author(s) : REICHL C., POPOVAC M., HOCHWALLNER F., WIMBERGER P., LINHARDT F., FLECKL T., EMHOFER J.

Summary

Air-to-water heat pumps – being essential to reach the ambitious climate goals – don’t come without challenges: Evaporators of air-to-water heat pumps are prone to severe frosting in humid climatic during late fall, winter and spring. To sustain a reasonable CoP, de-frosting strategies are employed to remove the frost layer and restore normal operation. De-frosting, however, also reduces efficiency due to downtimes and heat loss due to reverse operation. Frosting and de-frosting of evaporators is characterized using overview and detailed image capturing. The frost growth is additionally quantitatively assessed using a digital high-resolution scale. Together with the thermodynamic data of the heat pump and the control parameters of the climatic chamber a full transient data set is available and analysed deriving frosting and de-frosting correlations. The extensive data set is an important base for numerical simulation: Frost growth and weight increase can be used to validate three-dimensional frosting models necessary to simulate and – in a second stage – optimize evaporator designs. Furthermore, the thermodynamic behaviour during frosting and de-frosting is an important input to one-dimensional system models of heat pumps.

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Pages: 11 p.

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Details

  • Original title: Frosting and Defrosting Behavior of Evaporators.
  • Record ID : 30029971
  • Languages: English
  • Subject: Technology
  • Source: 13th IEA Heat Pump Conference 2021: Heat Pumps – Mission for the Green World. Conference proceedings [full papers]
  • Publication date: 2021/08/31

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