perimental Study on the Performance of a New Type Solar Air Heater with Cross-Corrugated Surface on Different Environmental Conditions

Subject Areas : Fluid Mechanic

نادر  رهبر ¹ (عضو هیات علمی/ دانشگاه آزاد سمنان)
محمد  جوادی نیا ایزدی ² (دانشجو)
پژمان  ظهوریان ایزدی ³ (دانشجو)

Received: 2015-07-07 Accepted : 2015-08-12 Published : 2012-11-21

Keywords: Optimization, Efficiency, Solar collector, Cross-Corrugated surface, Air Heater,

Abstract :

In This paper, the effect of using cross-corrugated surface as an absorber plate in a solar air collector was experimentally investigated. Black plate geometries of air heater was V-type, while some vertical baffles were used to conduct air flow between surfaces. With these modification turbulence regime and heat transfer enhancement were achieved. A centrifugal fan was also used to produce 0.003-0.01 kg/s air flow. Moreover different position angles (30, 45 and 90 degrees) were used to evaluate the performance of the system. The results showed that with these modification the Nusselt number was 5 times greater than before. Furthermore, a new correlation was proposed which has a good accuracy in estimation of Nu number.