Thermal Energy and Exergy Analysis of N-Evacuated Tubular Collectors (ETCs) Integrated with Fresnel Lens
摘要
It is well known that the flat-plate collector (FPC) has limitations in its performance due to its small life span as well as performance point of view for equal surface area of solar energy gain and loss term. However, this problem is solved in evacuated tubular collector (ETC) by reducing loss term from absorber to ambient air with longer life due to maximum use of glass cover. This paper analyzes the Fresnel lens (FL) integrated evacuated tubular collectors (ETC) connected in series based on energy balance equations. The proposed system will be referred as Fresnel lens integrated evacuated tubular collectors (FLiETC). An analytical expression for the outlet fluid temperature has been derived as a function of design and climatic parameters. Further, an analytical expression has been used to evaluate thermal energy and exergy of number of FLiETC collectors connected in series.