Abstract
The performance of the parabolic trough collector is studied experimentally using a rotary receiver tube. The parameters such as temperature increase, friction factor and thermal efficiency at receiver tube speed of 0, 2 and 4 rpm are investigated. Tests were performed for varied inlet temperatures and flow rates. From the achieved results, it is found that the friction factor increases dramatically due to the usage of rotary receiver tube. Furthermore, for receiver tube speeds of 4, 2 and 0 rpm the maximum values of temperature differences are found to be 18.5 °C, 12.5 °C and 4.0 °C respectively. It is found that the enhancement of the thermal efficiency is due to decreasing the inlet temperature and by increasing the flow rate. Moreover, the highest thermal efficiency improvement of the collector is due to the usage of rotary receiver tube. Maximum efficiency improvement for a tube speed of 4 and 2 rpm is found to be 190.3% and 158.6% respectively in comparison with the stationary receive tube.
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