Comparison of line focusing solar concentrator fields considering shading and blocking. (December 2015)

• Record Type: Journal Article
• Authors: Sharma, Vashi; Nayak, Jayanta K.; Kedare, Shireesh B.
• Is Part Of: Solar energy. Volume 122(2015)
• Page Start: 924
• Page End: 939
• Publication Date: 2015-12
• Subjects: Parabolic trough -- Linear Fresnel reflector -- Shading -- Blocking; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2015.10.011
• Languages: English
• ISSNs: 0038-092X

Abstract

Highlights: Three line focusing technologies compared in terms of energy collection. Electricity generation and cost of electricity compared. Effect of shading, blocking and optical parameters on cost of electricity studied. Best land coverage ratio for minimum cost of electricity found. Abstract: The performance of line focusing solar collectors [Parabolic Trough Concentrator (PTC), Linear Fresnel Reflector (LFR) and Compact Linear Fresnel Reflector (CLFR)] is affected by many factors. Due to end effect, inter-row shading and blocking (for LFR and CLFR), the complete aperture of the collector cannot be utilized. Besides, the cosine effect, reflectivity of reflectors, intercept factor, transmissivity of receiver cover, absorptivity of absorber tube and thermal losses are the other major contributors to the energy losses. In the current work, PTC, LFR and CLFR fields are compared in terms of energy losses, net energy collection by fluid, electricity generation and cost of electricity. The ratio of collector aperture area to land area is named as land coverage ratio. The appropriate values of land coverage ratio are found out corresponding to minimum cost of electricity for different technologies. The corresponding annual energy collection by fluid and the annual electricity generation have also been calculated. It is seen that there is no significant difference in the performance of LFR and CLFR fields. For low values of receiver height to collector width ratio, the LFR field results in the largest levelised cost of electricity and the PTC field results in the lowest.