A cylindrical blackbody solar energy receiver

Boyd, David A.; Gajewski, Ryszard; Swift, Roderick D.

doi:10.1016/0038-092x(76)90004-9

Cited by 39 publications

(11 citation statements)

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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%

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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Section: Linear Fresnel Lensesmentioning

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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“…Graphite and lampblack are close to blackbodies with emissivity greater than 0.95. Other blackbodies include cylindrical blackbody solar receiver and black fluid with antireflective device [9]. Here, the receiver consists of an annular cylindrical tube with an aperture parallel to the axis of the cylinder.…”

Section: Black Body Receivermentioning

confidence: 99%

Overview of Concentrated Solar Power

Chukwuka¹,

Folly²

2014

JEPE

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CSP (concentrated solar power) has been viewed as the technology that if properly developed could lead to a large scale conversion of solar energy into electricity. CSP is a type of solar energy converter that is classified as thermal converter because the output power produced is a function of the operating temperature. The main components of a CSP plant are the solar field which is made up of the heliostat arrays, the receiver tower, the heat transfer fluid, the molten salt thermal energy storage tanks and the power conversion unit, which is made up of the turbine and the generator. The main advantage of CSP is that of a cheap thermal storage (i.e., molten salt storage) which makes it possible to dispatch power at a cost comparable to the grid electricity. Simulations run with the SAM (systems advisory model) developed by NREL (National Renewable Energy Laboratory) showed that CSP is capable of delivering electricity at the cost of 17UScents per kWh for the 30-year life of the plant. The main disadvantage of CSP however, is that of low efficiency (8%-16%). There are ongoing research works to improve the efficiency of the CSP. One way to improve the efficiency is to increase the operating temperature of the system. In this paper, the authors discussed different modules of the CSP plant and suggested ways to improve on the conversion efficiencies of individual modules. Finally, an overall systems performance simulation is carried using SAM and the simulation results show that electricity can be produced using CSP at the cost of R1.05 per kWh.

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“…Nevertheless, air has several advantages: it is free, has no upper-temperature limitation, suffers no degradation, and is not toxic. Examples of CSP designs that use air as HTF include pressurized receivers for solar tower systems (Buck et al, 1999;Kribus et al, 2001;Heller et al, 2006;Hischier et al, 2012) and non-pressurized receivers for solar trough systems (Boyd et al, 1976;Bader et al, 2010;Good et al, 2013). Various TES concepts have been experimentally investigated for use with high-temperature air, including a packed beds of rocks (Meier et al, 1991;Hänchen et al, 2011;Zanganeh et al, 2012), alumina porcelain ceramics (Zunft et al, 2011), or ZrO 2 pellets (Jalalzadeh-Azar et al, 1996;Nsofor and Adebiyi, 2001), and a sand-based heat exchanger (Warerkar et al, 2011).…”

Section: Introductionmentioning

confidence: 99%