Performance model for two-stage optical concentrators for solar thermal applications

O’Gallagher, J.; Winston, R.

doi:10.1016/0038-092x(88)90027-8

Cited by 23 publications

(7 citation statements)

References 11 publications

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“…The estimation of slope local errors of mirror surfaces is more complex. We can make the hypothesis of a Gaussian distribution with 5 mrad standard deviation [25]. Thus, the beam we choose for this work has Gaussian angular distribution of σ = 5.9 mrad, as resulting from the convolution of all the cited divergence sources.…”

Section: Methods Of Cpc Approximationsmentioning

confidence: 99%

Simple Methods to Approximate CPC Shape to Preserve Collection Efficiency

Jafrancesco

Sani

Fontani

et al. 2012

International Journal of Photoenergy

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The compound parabolic concentrator (CPC) is the most efficient reflective geometry to collect light to an exit port. Anyway, to allow its actual use in solar plants or photovoltaic concentration systems, a tradeoff between system efficiency and cost reduction, the two key issues for sunlight exploitation, must be found. In this work, we analyze various methods to model an approximated CPC aimed to be simpler and more cost-effective than the ideal one, as well as to preserve the system efficiency. The manufacturing easiness arises from the use of truncated conic surfaces only, which can be realized by cheap machining techniques. We compare different configurations on the basis of their collection efficiency, evaluated by means of nonsequential ray-tracing software. Moreover, due to the fact that some configurations are beam dependent and for a closer approximation of a real case, the input beam is simulated as nonsymmetric, with a nonconstant irradiance on the CPC internal surface.

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Section: Methods Of Cpc Approximationsmentioning

confidence: 99%

Simple Methods to Approximate CPC Shape to Preserve Collection Efficiency

Jafrancesco

Sani

Fontani

et al. 2012

International Journal of Photoenergy

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“…The geometrical concentration ratio and theoretical maximum possible concentration ratio of the CPC are obtainable from (6) [71,72]:…”

Section: Compound Parabolic Concentrator (Cpc)mentioning

confidence: 99%

“…Basically, the role of concentration photovoltaic systems is to collect both beam and scattered irradiation, which do not reach the photovoltaic cells. Besides photovoltaic, the concentrator also has other applications such as thermal power applications [5][6][7], lighting systems [8][9][10], pumping of solar lasers [11][12][13][14][15], hydrogen production [16][17][18], and other applications. Although Parida et al [19] performed a fundamental review study on the solar photovoltaic technologies and McConnell et al [20] reviewed market aspects of solar concentrators, there is no complete review on concentrated photovoltaic technologies.…”

Section: Introductionmentioning

confidence: 99%

A Review of Solar Photovoltaic Concentrators

Khamooshi

Salati

Egelioğlu

et al. 2014

International Journal of Photoenergy

142

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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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“…These tests employed a "trumpet" type secondary (Winston and Welford, 1979) in combination with the Cummins Power Generation CPG-460 7.5 kWe concentrator system (Bean and Diver, 1993) and were the first such tests ever performed with a hot receiver. These tests and observations were reviewed in the context of a detailed thermal performance model for two-stage solar concentrator systems developed previously O'Gallagher and Winston, 1988).…”

Section: First Demonstration Of a High Temperature Prototypementioning

confidence: 99%

''Atomic Optics'': Nonimaging Optics on the Nanoscale

O'Gallagher¹

2005

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Performance model for two-stage optical concentrators for solar thermal applications

Cited by 23 publications

References 11 publications

Simple Methods to Approximate CPC Shape to Preserve Collection Efficiency

Simple Methods to Approximate CPC Shape to Preserve Collection Efficiency

A Review of Solar Photovoltaic Concentrators

''Atomic Optics'': Nonimaging Optics on the Nanoscale

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