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Experimental research on a novel frost-free air-source heat pump water heater system.

[In Chinese. / En chinois.]

Author(s) : WANG Z., WANG F., ZHENG Y.

Type of article: Article

Summary

Aiming to the frosting problem of air-source heat pump (ASHP) at low temperatures, a novel frost-free air-source heat pump water heater (ASHPWH) system is proposed in the paper,in which dehumidilication of solid desiccant is used lo reduce the humidity ratios of ambient air to realize frost-free operation. In order to keep the system working continuously, phase-change thermal storage is used to recycle the condensation heat that acts as a low temperature resource to regenerate the solid desiccant. The novel system was compared experimentally with conventional defrost system at a temperature of 0°C and relative humidity (RH) of 80%. The results show that the average COP of the system was increased by 7.25% and 46.3% in comparison with hot-gas bypass defrosting and electric resistance heating, which proves the feasibility of the novel system.

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Pages: 52-58

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