Performance evaluation thermal efficiency for the parabolic collector with two types of absorber

Abstract

In recent years, many research studies focused on enhancing and improving the cost of the solar water heating system. This paper focuses on the development of the thermal efficiency of the solar parabolic dish collector (PDC) with different types of the absorber. A spiral coil and helical conical coil receivers in a PDC system are studied experimentally. The experimental system consists of a solar parabolic dish 1.5m diameter, spiral coil, helical conical coil, and solar tracking system. The concentrated solar radiation amounting the receiver heats the working fluid (water) flows through this tube (coil spiral or helical conical). The preliminary calculations have been accomplished on the typical winter day in Najaf, Iraq (32.1°N /44.19°E). Effect of volumetric flow rates on the useful energy and thermal efficiency of the system has been investigated. They are conducted within 30 L/h and 60 L/h of volumetric flow rates. The experimental results showed that the maximum outlet temperature was obtained from PDC with spiral coil receiver with 30 L/h volumetric flow rate. The PDC with a spiral coil has the potential to supply hot water is about 30.14%, 53.48% more efficient than of a PDC with a helical conical coil at 30 L/h, 60 L/h respectively.