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Comparison of the Energy Performance between Flat-plate and Heat Pipe Evacuated Tube Collectors for Solar Water Heating Systems under Mediterranean Climate Conditions

Journal of Sustainable Development of Energy, Water and Environment Systems
ARTICLE IN PRESS (volume, issue and page numbers will be assigned later)
DOI: (registered soon)
Altin Maraj1 , Andonaq Londo1, Coskun Firat2, Alemayehu Gebremedhin3
1 Department of Energy, Polytechnic University of Tirana, Sheshi Nënë Tereza, 1019 Tirana, Albania
2 Energy Institute, Technical University of Istanbul, Maslak, Sarıyer, 34469 Istanbul, Turkey
3 Department of Manufacturing and Civil Engineering, Norwegian University of Science and Technology, Teknologivegen 22, 2802 Gjøvik, Norway


In this paper, the energy performance of a flat-plate collector and a heat pipe evacuated tube collector exploited for domestic hot water production in the Mediterranean climate is compared. For this purpose, yearly data obtained from two field-trial solar water heating systems are used. The selected systems are with forced circulation and installed near each other. The studied solar collectors are installed on the roof with the same slope angle of 45° and the surface azimuthal angle of 10°. The installed surface area of the flat-plate solar collector is 4.41 m2, whereas for the heat pipe evacuated tube collector is 1.5 m2. The annual irradiation on solar collector plane was 1,456 kWh/m2year. Obtained results showed that the annual solar yield for the flat-plate collector was
664 kWh/m2year, whereas for the heat pipe evacuated tube collector was 885 kWh/m2year. The annual average collector efficiencies were 0.494 and 0.62, respectively.

Keywords: Flat-plate collector, Evacuated tube collector, Heat pipe, Useful energy gain, Losses, Collector efficiency.

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