Abstract
The overall thermal performance of a Parabolic Trough Collector (PTC) depends on its optical performance, particularly the uniformity of the irradiance distribution and the resultant optical efficiency of the collector. Local Concentration Ratio (LCR), optical efficiency and average light concentration are three fundamental parameters of the optical performance of a PTC. These parameters are affected by various optical and physical factors. The effects of these individual factors on the performance parameters were investigated in this study using a verified Monte Carlo ray tracing optical simulation model. The investigation revealed that all three performance parameters are directly related to the optical properties of the collector components. The values decreased gradually with the increase of focal length of the mirror. Uniformity of the LCR profile was observed to decrease with increasing rim angle and geometric concentration. Defocus dislocation of the receiver was found to improve the uniformity of the LCR distribution by decreasing its peak concentrations, Cmax. Off-focus dislocation of the receiver, and inward angular deviation of the mirror profile were observed to increase the Cmax and decrease the uniformity of the LCR distribition. Out-focus dislocation of the receiver and solar tracking error distort the bi-symmetry of a normal LCR profile.
Highlights
Parabolic trough collectors (PCTs) usually comprise a parabolic reflector and a receiver through which a heat transfer fluid is circulated
This study proposes a comprehensive framework to conduct MCRT simulation of parabolic trough concentrators
The ηopt and Cavg were normalised by dividing a certain value by tube, ηopt, and Cavg of the collector
Summary
Parabolic trough collectors (PCTs) usually comprise a parabolic reflector and a receiver through which a heat transfer fluid is circulated. The solar radiation reaching the PTC is reflected and focused onto the outer surface of a receiver absorber tube where the radiant energy is converted into thermal energy. This thermal energy is conducted to the inner surface of the absorber tube and transferred to the heat transfer fluid by forced convection. The PTC shown, consists of a single axis North-South tracking parabolic trough mirror that focuses solar radiation onto the receiver comprising an absorber tube surrounding by an evacuated glass envelope. The optical performance involves various parameters, including irradiance distribution around its receiver tube, optical efficiency (ηopt )
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