THE ASSESSMENT OF OPTIMAL TILTING ANGLE OF FLAT PLATE SOLAR COLLECTORS - CASE STUDY FOR RAFSANJAN...

The tilt angle of a solar collector with respect to the horizon is one of the most important factors affecting its performance. This is because the amount of solar energy hitting the collector surface changes as the tilt angle changes. The monthly average daily diffuse solar radiation on a horizontal surface was first computed in this work, and then the global solar radiation on inclined surfaces was estimated using a conventional isotropic model. Finally, for maximal global sun radiation, the monthly, seasonal, and yearly optimum slope angles were proposed. The monthly optimal tilt angle ranges from 0° (May and July) to 62.3° (December); also, the seasonal optimum slope angle is from 5.1° (spring) to 54.8° (autumn); and the optimum yearly tilt angle is 29.9°, which is close to Rafsanjan, Iran's latitude.

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