Flux concentration on tubular receiver of compound parabolic collector by surface areal irradiance method of ray tracing

Waghmare, Sainath A.; Gulhane, Nitin P.

doi:10.1016/j.ijleo.2017.02.064

Cited by 10 publications

(1 citation statement)

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“…Ray tracing is a very useful tool to precisely estimate the flux distribution and amount of solar energy available at the receiver. Many research studies [25][26][27][28] have successfully applied this method to evaluate the effect of different parameters on the optical performance of solar collectors. Chen et al [29] used ray-tracing method to analyze the optical performance of an E-W oriented CPC collector coupled with tubular receiver for different truncation heights of reflectors and tilt angles.…”

Section: Introductionmentioning

confidence: 99%

Optical Performance Analysis of Single Flow Through and Concentric Tube Receiver Coupled with a Modified CPC Collector Under Different Configurations

et al. 2019

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Compound parabolic concentrating (CPC) collectors have great potential to provide sustainable solar thermal energy for many applications operating in the medium temperature range. This paper presents the design, development and performance evaluation of a modified CPC collector integrated with an evacuated tube receiver. The optical performance of the designed CPC paired with concentric tube receiver is compared with that of a CPC coupled with single flow through evacuated tube receiver for stationary installation in the East-West and North-South directions. Ray tracing simulations of different configurations demonstrate that CPC coupled with single flow through receivers suffer high gap losses, especially at smaller incidence angles which are considerably alleviated by a concentric tube receiver arrangement. East-West installation of CPC paired with concentric tube receiver exhibited superior optical performance than all other configurations. The yearly average optical efficiency of CPC with concentric tube receiver was 5% higher than that of a single flow through receiver within the acceptance angle. A 60% truncated CPC coupled with concentric tube receiver emerged as the most effective design, which was fabricated for experimental testing. The tests conducted under actual outdoor tropical environmental conditions demonstrated that the experimental optical efficiency reached to about 69% in the case of N-S installation and 66.5% in an E-W arrangement. The experimental results closely match the simulation outcomes, which indicate the proposed performance prediction technique as instrumental for selecting the most effective configuration of CPC collectors for medium temperature heat supply.

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