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Solar energy is abundant in Yunnan province, China, and buildings in this area have a surging demand for heat supply over winter season. Targeting on seven representative cities in Yunnan, this paper analyzed the optimum tilt and azimuth angles of the panel typed solar collector within these cities over a year by applying the orthogonal method, and an improved mathematical model in calculating the collected solar radiation was also developed, and the influence of the varying tilt and azimuth angles on the solar heat collection was also analyzed. Results showed that, the collected solar radiation varied in a parabola curve and was slowly decreasing after the azimuth was reaching 0° and the dip angle was approaching the location latitude, when the azimuth angle was varying from -65° to 65° and the dip angle was increasing from 0° to 90°, respectively. And among these cities, the optimum dip angles were ranging from 29° to 33° and the optimum azimuth angles were ranging from -18° to 5°, respectively, which were within the recommended ranges of the local standard. However, the maximum decrease rates of the captured solar radiation can amount to 12.15% and 2.8%, respectively, if choosing the tilt and azimuth angles of the panel typed solar collector randomly.

Influencing factor Analysis of collecting capability over a year by the panel typed solar collector for seven representative cities in Yunnan, China