A Two Axis Dish Solar Collector with Two Types of Absorber : Spiral and Helical Conical Absorber as a Comparative Study
Abstract
In this study it has been used 2 m diameter of dish with two axis tracking system and with two types of absorber ( spiral coil and helical conical coil ) with same geometric concentration ratio (100). It has been used water as a working fluid in the system. The parameters which have been measured are as following: beam solar radiation, ambient temperature , absorber temperature , inlet water temperature , outlet water temperature, air velocity and volumetric flow rate. When volumetric flow rate was 0.33 L/min it has been found the maximum)outlet temperature, useful energy and thermal effieciency(of helical conical coil at 12 am as 101.11oC , 679.28 W, 24.4 % respectively. Although , the beam solar intensity was decreased but this values with spiral coil was increased with same flow rate 0.33 L/min and same time as 124.34 oC , 724.38 W and 28.6 % respectively. Experimental results, have been showed that spiral coil absorber more efficient than helical conical absorber.
