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A new method for preventing air-source heat pump water heaters from frosting.

Author(s) : ZHANG L., FUJINAWA T., SAIKAWA M.

Type of article: Article, IJR article

Summary

This paper proposes a frost-free air-source heat pump water heater (ASHPWH) system with integrated solid desiccant, in which frosting can be retarded by dehumidifying air before it enters the ASHPWH evaporator. The system consists of a conventional heat pump water heater and an extra heat exchanger coated by a solid desiccant. During the desorption process of the desiccant, regeneration air is cycled between the desiccant-coated heat exchanger and the evaporator to recover the sensible heat and latent heat of the regeneration air. A numerical simulation is carried out at a dry-bulb temperature of -7–5.5°C and a relative humidity of 60–80% depending on the frosting conditions. The results show that the coefficient of performance (COP) is within the range 3.3–3.8, which is 5–30% higher than that of the ASHPWH system using the hot-gas defrosting method.

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Pages: 1327-1334

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Details

  • Original title: A new method for preventing air-source heat pump water heaters from frosting.
  • Record ID : 30004378
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 35 - n. 5
  • Publication date: 2012/08

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