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This work has been supported by the Spanish "Ministerio de Ciencia e Innovacion", through the project ref: PID2020-115665RB-100 "Descarbonizacion de edificios e industrias con sistemas hibridos de bomba de calor".

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Methodology for frost growth estimation in fin and tube evaporators and the potential use in the optimization of defrost time

Publicat a:25th Iir International Congress Of Refrigeration, Icr 2019. 1338-1347 - 2023-01-01 (), DOI: 10.18462/iir.icr.2023.0273

Autors: Alarcon-Gallen, David; Navarro-Peris, Emilio; Marchante-Avellaneda, Javier; Hassan, Abdelrahman H; Gonzalvez-Macia, Jose

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Resum

One of the factors with a higher impact on the evaporator's performance in air source heat pumps (ASHP) is frost formation and growth due to its adverse effects in reducing the airflow and increasing the air-side thermal resistance. This results in a degradation in evaporation temperature, affecting the whole system's performance. So, estimating the frost formation and its effects is critical in the evaporator design process. First, monitoring of the frost growth process has been recorded and some magnitudes like the blockage ratio and the amount of water condensate were registered under several working air conditions. These were compared with a theoretical frost growth and densification model. Finally, the influence of fin pitch and the tube separation on the frost growth have been evaluated showing that the model can be a very effective tool for designing evaporators under different frost conditions.

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