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Abstract

Todays, maintaining atmospheric health is one of the most important prerequisites for sustainable global economic development, and the international community has no choice but to switch to renewable energies, including solar energy. The goal of the study was to provide a temperature of 60 ° C for drying summer fruits such as apricots therefore we investigated the effect of temperature control systems on the solar-electrical collector performance. Three LM35 temperature sensors were placed at 3 points of the collector (before the air inlet to the collector, after the air outlet from the collector and after heating elements) that were linked to the MATLAB software and sent the temperature to the software online and stored there. Also three heating elements were embedded after the air outlet from the collector to provide hot air when the solar energy is not enough to heat the air needed. The performance of the controller was investigated in three cases namely all heating elements were simultaneously activated, the two elements were simultaneously activated and when only one element was activated. Comparisons of variances showed that when the two elements were active, the control system had a timely response and optimal overshoot rather than the three-element and single-element mode, due to the low standard deviation. The results also showed that using the heating elements in the solar collector, hot air can be compensated in rainy days or in areas such as Ardabil that is not high in sunlight. According to the calculations, it was found that during the data logging hours, the contribution of solar energy in the supply of hot air was 44.44 % on a completely sunny day and 23.66% on partly sunny day.

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