Performance evaluation of thin-film solar concentrators for greenhouse applications

Hammam, M.; El‐Mansy, M. K.; El-Bashir, S.M.; El-Shaarawy, M.G.

doi:10.1016/j.desal.2007.04.034

Cited by 68 publications

(66 citation statements)

References 14 publications

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“…Basically, the Parans lighting system has three major components, as highlighted by previous researchers [4,6,8,9,[16][17][18][19][20][21], and shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Empirical Evaluation of the Effect of Heat Gain from Fiber Optic Daylighting System on Tropical Building Interiors

et al. 2014

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A fiber optic daylighting system is an evolving technology for transporting illumination from sunlight into building interiors. This system is a solution developed by daylighting designers to reduce operational costs and enhance comfort. As an innovative technology, fiber optic daylighting systems can illuminate building interiors efficiently compared with other daylighting strategies. However, as a transmission medium in daylighting systems, optical fibers require uniform light distribution in sunlight concentration, which could generate heat. Therefore, this study aims to investigate the effect of heat buildup produced by end-emitting fiber optic daylighting systems in tropical buildings. The applied method adopts a new fiber optic daylighting system technology from Sweden called Parans SP3, with a 10 m cable to be tested in an actual room size under the Malaysian climatic environment, particularly within the vicinity of the main campus of the Universiti Sains Malaysia. Results show that the system generated a temperature of 1.3 °C under average conditions through fiber optic diffusers and increases indoor temperature by 0.8 °C in a 60 m3 room. According to the results, applying fiber optic daylighting systems, as renewable energy sources, generates extra heat gain in building interiors in the tropics.

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“…Basically, the Parans lighting system has three major components, as highlighted by previous researchers [4,6,8,9,[16][17][18][19][20][21], and shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Empirical Evaluation of the Effect of Heat Gain from Fiber Optic Daylighting System on Tropical Building Interiors

et al. 2014

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“…The calculated LSC light efficiency (Zl) is 0.56%. The size and the form of the cross section could impact on the proportion of photons trapped by the LSC plate and the reduction of the cross-sectional area of the luminescent plate could increase the photon loss [2,3,21,22]. Accordingly, the light efficiency of the LSC could be raised by increasing the diameter of the fluorescent fibers embedded.…”

Section: Light Efficiency (Zl)mentioning

confidence: 97%

“…A large fraction of the emitted photon losses come from the escape cones. The size and form of the cross section could impact the proportion of photons trapped by the LSC plate and the reduction of the cross-sectional area of the luminescent plate could increase the photon loss [2,3,21,22]. It has been reported that thin luminescent concentrator films could be implemented in the form of integrated devices or as sensitive elements in the traditional four-detector differential position sensors [23,24].…”

Section: Solar Concentrators and Lscsmentioning

confidence: 98%

“…Evaluation is conducted to calculate the ratio of the luminous flux yielding from the two LSC finishing ends to the luminous flux dropping on the luminescent fibers, and it is defined here as the light efficiency (Zl). The luminous flux yielding from the LSC finishing denoted as F has been calculated in Equation (3). The luminous flux dropping on the luminescent fibers is denoted as F 0 , which is the luminous flux provided by the sun light.…”

Section: Light Efficiency (Zl)mentioning

confidence: 99%

“…As both direct and diffuse light is concentrated by a factor of 5-10, without the need for expensive tracking, smaller silicon or other solar cells can be used. As the cost of the transparent plastic is expected to be much lower than the area cost of the solar cell, the cost per Watt-peak is lower when compared with the cost of a planar silicon solar cell [2,3]. LSCs are also developed for lighting purposes.…”

Section: Introductionmentioning

confidence: 99%

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A new design of luminescent solar concentrator and its trial run

Chen

Abdul‐Rahman

Rao

2010

Int. J. Energy Res.

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SUMMARYNormal luminescent solar concentrators (LSC) have a great limitation in their light transportation because the light produced by the recently reported LSCs is not a point light source. In order to enable LSCs to use optical fibers as the effective remote light transport media, a new design of LSC, which uses three color luminescent fibers for solar absorption and uses clear optical fiber bundles to transport the absorbed sunlight into a remote place, is fabricated and tested. Radiation flux ratios with a mean value of 5.7%, the luminous flux up to 114.1 lumens, and the light efficiency of 0.56% have been achieved during the trial run. The luminous efficacy as 0.643 lm W À1 is higher than that of combusting candles (0.3 lm W À1 ) but lower than that of the incandescent light bulbs (16-40 lm W À1). Further, since the sun light is free, different from electrical light sources, the luminous efficacy of the new LSC does not result in any electricity consumption when it is under operation. A color analysis and spectrum test proves that the light produced by the new LSC performs a great match to the direct sun light in color.

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