Heat pump using photovoltaic and thermal hybrid panels
- Chubu Electric Power Co., Nagoya (Japan). Electrotechnology Applications R and D Center
- Kanagawa Inst. of Technology, Atsugi (Japan). Dept. of Mechanical Systems Engineering
Two types of photovoltaic and thermal hybrid panels were developed and were used one at a time or both in parallel as the evaporators (collectors) of a heat pump. The total collector area was 3.37 m{sup 2} for panels with fins on the back and 3.93 m{sup 2} for panels without fins. A rotary compressor with an electric power consumption of about 500 W was used. Adopting a conventional evaporator, the finned panels, or the flat panels, to the heat pump, COP of 2.7, 3.5 and 4 were obtained around noon when the ambient air temperature and the inlet water temperature at the condenser were about 10 C and 40 C, respectively. The evaporation temperature and the COP were found to become higher for the panels without fins than for those with fins in the daytime. During the night, a higher evaporation temperature was attained for the finned panels due to the higher convective heat transfer by the fins. The increase of efficiency by the cooling effect of the refrigerant was about 13% for the flat panels. Using finned panels with a large total area together with flat panels with an appropriate area, the evaporation temperature was found to be raised to nearly the ambient air temperature even when the solar radiation intensity was small, the evaporation temperature did not become too high even when the solar radiation intensity was very high, and a large amount of electric power could also be generated. The maximum electric power output was about 600 W in the experiments.
- OSTI ID:
- 113290
- Report Number(s):
- CONF-950336--; ISBN 0-7918-1300-2
- Country of Publication:
- United States
- Language:
- English
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