Abstract:

In the last decade, solar energy technologies are gaining attention due to their potential for reducing environmental emissions and enhancing sustainability in residential and industrial applications. In this regard, solar collector systems are widely used for hot water production in buildings. Currently, flat plate collectors are mostly used collector type; however, their efficiency dramatically drops in winter period when the hot water demand is at its peak. Consequently, present study is concerned with the design and development of a parabolic dish collector as an alternative to flat plate collectors. The proposed collector consists of a parabolic dish, a receiver made up of a black painted spiral coil tube heat exchanger and a glass glazing. In the system, a 50 L water tank is also used and the water is circulated between the collector and the water tank by employing a water pump. System is tested on the coldest days of the year (10-13 December 2018) and highest water temperature of 42 ℃ is achieved. The average and maximum instantaneous thermal efficiencies of collector were obtained as 48% and 76% respectively.

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