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The efficiency of a solar collector is a key factor for the performance of thermal facilities. As the weather conditions vary continuously during the day, the instant collector efficiency depends not only on the components employed in its construction but also on the actual environmental conditions, the hot water temperature and aging. An experimental research was performed to describe the transient behavior of a flat plate collector field under outdoor working conditions. A transient collector model was assembled using thermal resistances and capacitances. Three thermocouples were added to measure the centre point temperature of the glass cover, box back surface and absorber plate of one of the

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