Optimal geometries for one- and two-faced symmetric side-wall booster mirrors

Mannan, K. D.; Bannerot, Richard

doi:10.1016/0038-092x(78)90170-6

Cited by 28 publications

(15 citation statements)

References 8 publications

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“…However, pressure drop also increases. To elevate the plate temperature, booster mirrors of plane and curved types have been used [14][15][16][17][18]. Based on the work [2], selection of the set of values of roughness parameter p/ε, ε/D, and flow Reynolds number could be considered for the optimal thermo-hydraulic performance in roughened solar air heaters.…”

Section: Introductionmentioning

confidence: 99%

Plate Temperature and Heat Transfer Characteristics of Artificially Roughened Solar Air Heater

Prasad

Sah²

2014

Energy Procedia

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Higher value of intensity of radiation on absorber plate of solar air heaters and effective heat removal from the plate by the carrier fluid, air, enhances thermal performance of solar air heaters. The paper deals with the experimental results of enhancing the intensity of radiation by means of booster mirrors and that of heat transfer by means of providing artificial roughness on the air flow side of the absorber plate. An enhancement in radiation of about 40% have been found over the normal incident radiation by means of booster mirrors leading to higher rate of heat collection. The thermal performance parameters F R and F ' have been found to increase in the range of 90% to 130% and 92% to 135% respectively in comparison to those of smooth solar air heaters without booster mirrors and in the range of 10% to 15% in comparison to roughened solar air heater without booster mirrors for the same pressure drop due to artificial roughness within the range of the parameters investigated.

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Section: Introductionmentioning

confidence: 99%

Plate Temperature and Heat Transfer Characteristics of Artificially Roughened Solar Air Heater

Prasad

Sah²

2014

Energy Procedia

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“…[48][49][50][51][52] Another way of mitigating non-uniform illumination in PV application is the use of planar concentrators, which illuminate the receiver uniformly. [53][54][55][56] Nevertheless, the application of planar concentrators in PVs is limited by their low-concentration ratios. [53][54][55][56] To achieve high-concentration ratio and uniform illumination on the PV module, this study proposes the use of flat reflector sections in a symmetric 2-D CPC instead of the parabolic shape.…”

Section: Introductionmentioning

confidence: 99%

“…[53][54][55][56] Nevertheless, the application of planar concentrators in PVs is limited by their low-concentration ratios. [53][54][55][56] To achieve high-concentration ratio and uniform illumination on the PV module, this study proposes the use of flat reflector sections in a symmetric 2-D CPC instead of the parabolic shape. This collector is called multisectioned compound parabolic concentrator (M-CPC).…”

Section: Introductionmentioning

confidence: 99%

Optical performance analysis and design optimisation of multisectioned compound parabolic concentrators for photovoltaics application

Paul

2018

Int J Energy Res

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Summary Currently, all compound parabolic concentrators (CPCs) for photovoltaic (PV) application consist of reflecting surfaces in the form of a parabolic shape. However, parabolic shapes create non‐uniform illumination on the PV module, which significantly reduces the power output. To achieve high‐concentration ratio and uniform illumination on the PV module, this study proposes the use of flat reflector sections in a symmetric two‐dimentional CPC instead of the parabolic shape. This collector is called multisectioned compound parabolic concentrator (M‐CPC). However, the main challenge in designing such a concentrating system lies in the determination of the optimal number of flat sections and the width of each section so that the optical properties of the M‐CPC approaches that of the standard CPC. In this work, seven M‐CPCs having the same designing parameters but with different total number of flat reflector sections were designed. A detailed analysis of the optical performance was undertaken to optimase the M‐CPCs. The optimal design was based on‐high angular acceptance, low‐optical losses, high‐optical efficiency in a wide‐interval incidence angles, and uniform energy flux distribution on the PV module. Results from the ray trace simulation analysis show that the optimal M‐CPC is the design with a total number of seven flat reflector sections (ie, M‐CPC7). This design has high‐angular acceptance (100%) in a wide‐interval incidence angles, low‐optical losses (7%), and high‐optical efficiency of about 95% in a wide‐interval incidence angles. In addition, M‐CPC7 illuminates the PV module more uniformly than the standard CPC.

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“…They suggested that such collectors could offer an effective approach to reducing the cost of solar absorbers, particularly in locations with a high fraction of direct radiation. In a parallel study Mannan and Bannerot (1978) extended the idea of a single facet reflector V-trough to a two-facet design, which they found offered a compromise between a V-trough and a compound parabolic concentrator (CPC). In subsequent studies Puri (1981) and Sorour et al (1991) also showed that the performance of V-trough receivers was dependent not only on the concentration ratio and acceptance angles but also on the length of the trough.…”

Section: Introductionmentioning

confidence: 99%

Natural convection heat transfer in V-trough solar concentrators

Anderson

2013

Solar Energy

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The use of V-trough concentrators offers a simple approach to increasing the radiation incident on a solar receiver; this is particularly useful for increasing the temperature in thermal systems.However in order to accurately predict the performance of thermal systems under concentrated radiation, there is a need to understand the heat loss from them. This study experimentally shows that, for a laterally and longitudinally inclined enclosed V-trough concentrator, the natural convection heat loss can be predicted using an equation of the form Nu = a Ra b for Rayleigh numbers between 2x10 3 and 1x10 8 . It is suggested that the relationship is a good representation of heat transfer in enclosed V-trough concentrators under most practical orientations, and thus lends itself for implementation into design models for V-trough concentrators.

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Optimal geometries for one- and two-faced symmetric side-wall booster mirrors

Cited by 28 publications

References 8 publications

Plate Temperature and Heat Transfer Characteristics of Artificially Roughened Solar Air Heater

Plate Temperature and Heat Transfer Characteristics of Artificially Roughened Solar Air Heater

Optical performance analysis and design optimisation of multisectioned compound parabolic concentrators for photovoltaics application

Natural convection heat transfer in V-trough solar concentrators

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