Performance analysis of different U-shaped heat exchangers in parabolic trough solar collector for air heating applications

In this article, the thermal performance of a parabolic trough solar air heater (PTSAH) with U-shaped heat exchanger is evaluated. The heater's examined by using copper and aluminum exchangers (UHX) without fin alternately, inside absorber tube placed at focal length nickel-coated stainless steel trough. system in form temperature difference achieved outlet for both efficiency. It observed that better than exchanger. Further, it has been found efficiency increased 9.29% high flow rate use when place also 2.34% low rate. At elevated temperatures, percentage increase higher