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International Journal of Photoenergy
Volume 2015 (2015), Article ID 865041, 9 pages
http://dx.doi.org/10.1155/2015/865041
Research Article

Effect of Installation of Solar Collector on Performance of Balcony Split Type Solar Water Heaters

Key Laboratory of Advanced Technique and Preparation for Renewable Energy Materials, Ministry of Education, School of Energy and Environmental Science, Yunnan Normal University, Kunming, Yunnan 650500, China

Received 10 September 2015; Revised 27 November 2015; Accepted 20 December 2015

Academic Editor: Cheuk-Lam Ho

Copyright © 2015 Xu Ji et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The influences of surface orientation and slope of solar collectors on solar radiation collection of balcony split type solar water heaters for six cities in China were analyzed by employing software TRNSYS. The surface azimuth had greater effect on solar radiation collection in high latitude regions. For deviation of the surface slope angle within ±20° around the optimized angle, the variation of the total annual collecting solar radiation was less than 5%. However, with deviation of 70° to 90°, the variation was up to 20%. The effects of water cycle mode, reverse slope placement of solar collector, and water tank installation height on system efficiency were experimentally studied. The thermal efficiencies of solar water heater with single row horizontal arrangement all-glass evacuated tubular collector were higher than those with vertical arrangement at the fixed surface slope angle of 90°. Compared with solar water heaters with flat-plate collector under natural circulation, the system thermal efficiency was raised up to 63% under forced circulation. For collector at reverse slope placement, the temperature-based water stratification in water tank deteriorated, and thus the thermal efficiency became low. For improving the system efficiency, an appropriate installation height of the water tank was suggested.