A comparative study on the effect of glazing and cooling for compound parabolic concentrator PV systems – Experimental and analytical investigations

Gandhidasan, P.; Baloch, Ahmer A.B.; Tanweer, Bilal; Mahmood, M. Ansar

doi:10.1016/j.enconman.2016.10.028

Cited by 29 publications

(21 citation statements)

References 43 publications

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“…A comparative study by Yousef et al under hot and arid climatic conditions showed that, in comparison with similar solar panels, the electricity generated by CPC (2.4×)-based CPV system with and without cooling of solar cells was 52% and 33% higher, respectively [8]. Bahaidarah et al experimentally investigated the performance of CPC-based PV/T systems with and without glazing and concluded that the use of glass reduced the power output and thus was recommended for higher thermal gain, and the unglazed system was suitable for greater electric power output [9]. Stationary CPCs are commonly oriented in the east-west direction with a yearly fixed tilt angle for efficient solar radiation concentration [10], therefore, the increase in electricity from reflective CPVs is limited due to limited geometric concentration.…”

Section: Introductionmentioning

confidence: 99%

A Three-Dimensional Radiation Transfer Model to Evaluate Performance of Compound Parabolic Concentrator-Based Photovoltaic Systems

Tang

2018

Energies

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Abstract:In the past, two-dimensional radiation transfer models (2-D models) were widely used to investigate the optical performance of linear compound parabolic concentrators (CPCs), in which the radiation transfer on the cross-section of CPC troughs is considered. However, the photovoltaic efficiency of solar cells depends on the real incidence angle instead of the projection incidence angle, thus 2-D models can't reasonably evaluate the photovoltaic performance of CPC-based photovoltaic systems (CPVs). In this work, three-dimensional radiation transfer (3-D model) within CPC-θ a /θ e , the CPC with a maximum exit angle θ e for radiation within its acceptance angle (θ a ), is investigated by means of vector algebra, solar geometry and imaging principle of plane mirror, and effects of geometry of CPV-θ a /θ e on its annual electricity generation are studied. Analysis shows that, as compared to similar photovoltaic (PV) panels, the use of CPCs makes the incident angle of solar rays on solar cells increase thus lowers the photovoltaic conversion efficiency of solar cells. Calculations show that, 2-D models can reasonably predict the optical performance of CPVs, but such models always overestimate the photovoltaic performance of CPVs, and even can't predict the variation trend of annual power output of CPV-θ a /θ e with θ e . Results show that, for full CPV-θ a /θ e with a given θ a , the annual power output increases with θ e first and then comes to a halt as θ e > 83 • , whereas for truncated CPV-θ a /θ e with a given geometric concentration (C t ), the annual power output decreases with θ e .

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Section: Introductionmentioning

confidence: 99%

A Three-Dimensional Radiation Transfer Model to Evaluate Performance of Compound Parabolic Concentrator-Based Photovoltaic Systems

Tang

2018

Energies

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“…As seen from Figure 5, the path length of solar ray from the aperture to solar cells is different for different solar rays, thus τ a = exp(−kL) is different. However, the kL is small for DCPVs with small size of solar cells, and in this case τ a ≈1 − kL, implying that τ a is approximately a linear function of path length L, therefore, τ a,2 = exp(−kL 2 ) in Equation (21) can be estimated based on average path length of all solar rays as follows.…”

Section: 41mentioning

confidence: 99%

“…Experimental studies by Baig et al showed that inhomogeneous irradiation resulted in about 0.5% drop of solar cell efficiency of a linear dielectric CPC-based PV system [19], and Yu experimentally found that the power output of solar cells is highly sensitive to the incidence angle of solar rays on the cells (θ in ) when θ in > 60 • but weakly so to the solar flux distribution [20]. An experimental study by Bahaidarah et al showed that a glazed PV/T system would greatly reduce the power output and the unglazed system was advisable for greater electricity output [21]. A comparative experiment by Bahaidarah et al showed that, as compared to similar PV panels, using polished stainless steel as the reflectors of CPC (2.3×) increased the power output by 39% and 23% in the cases of cooling and non-cooling, respectively [22].…”

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confidence: 99%

A Theoretical Study on Performance and Design Optimization of Linear Dielectric Compound Parabolic Concentrating Photovoltaic Systems

Liu

Tang

2018

Energies

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To investigate solar leakage and effects of the geometry of linear dielectric compound parabolic concentrator with a restricted exit angle (DCPCθa/θe) on the performance of DCPCθa/θe -based photovoltaic systems (DCPVθa/θe), a three-dimensional radiation transfer model based on solar geometry and vector algebra is suggested. Analysis shows that the annual radiation loss due to leakage is sensitive to the geometry of DCPCs and tilt-angle adjustment strategy, and the optimal θe,opt for minimizing annual leakage is the one that makes the incidence angle of solar rays on the plane wall equal to the critical incidence angle for total internal reflection at solar-noon in solstices and days when tilt-angle adjustment from site latitude is made for DCPV with the aperture’s tilt-angle being yearly fixed, and adjusted two and four times, respectively. It is found that annual radiation leakage is considerable small, for DCPVs with θe < θe,opt, almost all leaked radiation comes from sky diffuse radiation, whereas for θe = 90°, most of leakage is attributed to direct sunlight. As compared to similar non-concentrating solar cells, more radiation arrives annually on solar cells of DCPVθa/θe at small angles thanks to refraction of radiation on the aperture, hence, under same operation conditions, the annual average photovoltaic efficiency of solar cells for concentrated radiation is even higher. Analysis also shows that the power increase of DCPVs, being much less than the geometric concentration of DCPCs (Ct), is mainly attributable to optical loss due to absorption of solar rays on the way to the solar cells, and the power loss due to leakage of radiation is not significant. From the point of annual electricity generation, for full DCPVs with a given θa, DCPVθa/90 are favorable, and for truncated DCPVs with given θa and Ct, DCPVs with θe < 90 are favorable; whereas from the point of contribution per unit volume of dielectric to the annual electricity generation, the situation is reversed.

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“…The yield of nine different designs of combined PV‐thermal collectors has been evaluated by Zondag et al They mentioned that the channel‐below‐transparent‐PV design gives the best efficiency, but the PV‐on‐sheet‐and‐tube design is a suitable alternative since it is easier to be manufactured with only 2% reduction in the annual efficiency. An experimental and theoretical study to evaluate the performance of glazed and unglazed PV‐CPC systems with and without active cooling has been presented by Bahaidarah et al They recommended the unglazed PV‐CPC construction for greater electrical power. An analytical model to estimate the thermal performance of a multijunction solar panel, under high solar concentration and with a liquid cooling at both sides of the panel, has been developed by Gakkhar et al They mentioned that the temperature of the liquid can be maintained up to 85°C.…”

Section: Introductionmentioning

confidence: 99%

A novel PVT/PTC/ORC solar power system with PV totally immersed in transparent organic fluid

Al‐Nimr

Al‐Ammari

2019

Int J Energy Res

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Summary A novel hybrid PVT/parabolic trough concentrator (PTC)/organic Rankine cycle (ORC) solar power system integrated with underground heat exchanger has been proposed. The evaporator unit consists of a transparent flat PVT solar collector and a PTC connected in series. The first transparent solar collector has transparent covers and consists of solar cells totally immersed within a pressurized transparent organic fluid that allows the solar radiation to reach the solar cells, cools them effectively, and captures all thermal losses from the solar cells. The second concentrator is a conventional one with opaque black receiver used to reheat the transparent organic fluid to higher temperatures. Both solar collectors (the PVT and PTC) perform as the boiler and superheater for the ORC. The performance of the proposed system is investigated by a steady‐state mathematical model. The results show that, at design conditions, the efficiency of the PV modules stabilizes around 12%, absorber efficiency varies within 64% to 75%, and the ORC efficiency varies within 7% to 17%.

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A comparative study on the effect of glazing and cooling for compound parabolic concentrator PV systems – Experimental and analytical investigations

Cited by 29 publications

References 43 publications

A Three-Dimensional Radiation Transfer Model to Evaluate Performance of Compound Parabolic Concentrator-Based Photovoltaic Systems

A Three-Dimensional Radiation Transfer Model to Evaluate Performance of Compound Parabolic Concentrator-Based Photovoltaic Systems

A Theoretical Study on Performance and Design Optimization of Linear Dielectric Compound Parabolic Concentrating Photovoltaic Systems

A novel PVT/PTC/ORC solar power system with PV totally immersed in transparent organic fluid

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