Performance analysis of a solar-assisted heat pump with an evacuated tubular collector for domestic heating

Performance of a solar-assisted heat pump with an evacuated tubular collector has been analyzed both theoretically and experimentally. A domestic heating system has been designed, constructed and tested. The evacuated tubular solar collector has been used to achieve higher collector efficiencies. The effects of evaporation temperature on the heating capacity and performance of the system have been investigated. Evaporation temperature varies between 5.2 and 20.7 °C while storage tank temperature varies between 9 and 35 °C. The maximum value of the coefficient of performance of the solar assisted heat pump is obtained as 6.38 experimentally. The calculated and experimental results are seen to be in a good agreement. A cost analysis of the proposed system is made comparing with a non-solar heat pump system.

► Evaporation temperature of SAHP changes with source temperature almost linearly.
► COP of SAHP increases with increasing evaporation temperature.
► Evaporation temperature influences COP and collector efficiency oppositely.
► Redemption time of SAHP may be very short according to regional conditions.