Concentrating collectors with flat linear fresnel lenses

Franc, F; Jirka, V.; Malý, Miroslav; Nábělek, B.

doi:10.1016/0741-983x(86)90017-2

Cited by 19 publications

(6 citation statements)

References 3 publications

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“…At 12:00 hours, the Fresnel lens with the lower groove density (FL3) resulted in a 10% increase in illuminance ratio as compared to that with a higher groove density (FL2). This agrees with the observation made by Franc et al 20 who have reported that lenses with Al-Azzawi 21 has also reported that a high groove density allows higher quality images; while a low groove density yields better efficiency through lower transmission losses.…”

Section: Performance Of Fresnel Lens With Different Groove Densitysupporting

confidence: 92%

Conceptual design and assessment of a profiled Fresnel lens daylight collector

Nair

Ganesan

Ramamurthy

2014

Lighting Research & Technology

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This paper describes design of daylight collectors using multiple Fresnel lenses, each facing the sun for a particular period of time in a day. The influence of solar movement on flat Fresnel lens was studied. The influence of groove density of the lens was also determined by which the suitable Fresnel lens was selected. Passive and profiled north-facing and south-facing collectors with multi-lens system have been designed based on the solar altitude and azimuth angle of a geographical location. Performance of the north-and south-facing collector at different times of a day with an acrylic dome indicated better efficiency and uniformity of lighting throughout the day time for the proposed profiled Fresnel collectors.

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Section: Performance Of Fresnel Lens With Different Groove Densitysupporting

confidence: 92%

Conceptual design and assessment of a profiled Fresnel lens daylight collector

Nair

Ganesan

Ramamurthy

2014

Lighting Research & Technology

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“…The flat linear Fresnel lens is considered to be a suitable concentrator for both photo-thermal and photovoltaic conversion of solar radiation (Al-Jumaily and Al-Kaysi., 1998;Boyd et al, 1976;Franc et al, 1986). A Fresnel lens is an optical component which can be used as a lightweight alternative to conventional continuous surface optics.…”

Section: Linear Fresnel Lensesmentioning

confidence: 99%

“…The study demonstrated that the concept output temperatures were between 130°C and 370°C (Boyd et al, 1976). Franc et al (1986) studied and tested a stationary linear Fresnel lens system with movable absorber. The experiments showed a yearly gain of 360 kWh/m 2 under climatic condition in Central Europe.…”

Section: Linear Fresnel Lenses For Thermal Applicationsmentioning

confidence: 99%

Theoretical and experimental analysis of an innovative dual-axis tracking linear Fresnel lenses concentrated solar thermal collector

et al. 2017

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Linear concentrating solar thermal systems offer a promising method for harvesting solar energy. In this paper, a model for a novel linear Fresnel lens collector with dual-axis tracking capability is presented. The main objective is to determine the performance curve of this technology by means of both experiment and theoretical analysis. A mathematical model including the optical model of the concentrator and the heat transfer model of the receiver pipe was developed. This tool was validated with experimental data collected using a proof of concept prototype installed in Bourne, UK. The performance curve of the collector was derived for temperatures between 40°C and 90°C. The results show that the global efficiency of the collector is limited to less than 20%. The energy losses have been analysed. The optical losses in the lens system accounts for 47% of the total energy dissipated. These are due to absorption, reflection and diffraction in the Fresnel lenses. Furthermore manufacturing error in the lens fabrication has to be considered. One third of the solar radiation collected is lost due to the low solar absorptance of the receiver pipe. Thermal radiation and convection accounts for 6% of the total as relatively low temperatures (up to 90 °C) are involved. In order to increase the performance of the system, it is recommended to install an evacuated receiver and to insulate the recirculation system. Considering data from manufacturers, these improvements could increase the global efficiency up to 55%. Utilising the results from this work, there is the intention of building an improved version of this prototype and to conduct further tests.

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“…The point-focus Fresnel lens has the advantage of having potential for simple mass-produced optics but its serious problem is the loss of efficiency at higher concentration. Optical properties of flat linear Fresnel lenses manufactured from glass are presented by Franc et al [50] and the behavior of these lenses in perpendicular and inclined beams of rays is discussed.…”

Section: Fresnel Lensesmentioning

confidence: 99%

A Review of Solar Photovoltaic Concentrators

Khamooshi

Salati

Egelioğlu

et al. 2014

International Journal of Photoenergy

145

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Throughout the recent centuries, the limits of using energy resources due to the cost and environmental issues became one of the scientists’ concerns. Because of the huge amount of energy received by the Earth from the sun, the application of photovoltaic solar cells has become popular in the world. The photovoltaic (PV) efficiency can be increased by several factors; concentrating photovoltaic (CPV) system is one of the important tools for efficiency improvement and enables for a reduction in the cell area requirement. The limits of the PV area can reduce the amount of absorbing irradiation; CPV systems can concentrate a large amount of sunlight into a smaller one by applying lenses or curved and flat mirrors. However, the additional costs on concentrating optics and cooling systems made CPV less common than nonconcentrated photovoltaic. This paper reviews the different types of PV concentrators, their performance with advantages and disadvantages, concentration ratio, acceptance angle, brief comparison between their efficiencies, and appropriate cooling system.

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Concentrating collectors with flat linear fresnel lenses

Cited by 19 publications

References 3 publications

Conceptual design and assessment of a profiled Fresnel lens daylight collector

Conceptual design and assessment of a profiled Fresnel lens daylight collector

Theoretical and experimental analysis of an innovative dual-axis tracking linear Fresnel lenses concentrated solar thermal collector

A Review of Solar Photovoltaic Concentrators

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