Determination of the spatial extent of the focal point of a parabolic dish reflector using a red laser diode

Mlatho, Justice; McPherson, M.; Mawire, Ashmore; Heetkamp, R.J.J. Van den

doi:10.1016/j.renene.2010.01.030

Cited by 4 publications

(10 citation statements)

References 10 publications

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“…The shapes of the receivers, the surface shapes, and the diameter of the receiver apertures were chosen based on the work of reference [16] and also on the results of a raytracing program [17]. From the results of the spatial extent (SE) of the focal region (FR) obtained with a radiometer method [16], a diameter of 0.1 m for a flat aperture was considered as reasonable option in order to obtain maximum flux concentration.…”

Section: Design and Description Of The Receiversmentioning

confidence: 99%

“…From the results of the spatial extent (SE) of the focal region (FR) obtained with a radiometer method [16], a diameter of 0.1 m for a flat aperture was considered as reasonable option in order to obtain maximum flux concentration. This is because the energy from the receivers is intended to be delivered at high temperatures of around 200…”

Section: Design and Description Of The Receiversmentioning

confidence: 99%

“…The wire mesh was chosen as the candidate for investigation because it is cheap and readily available to rural households in Africa. In this work, three receivers were designed and fabricated for use with an SK-14 parabolic dish reflector (PDR) [16] in order to make a PDC. The purpose of the PDC is to charge a TES system [16,17] to be used in an indirect solar cooker.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Performance of Solar Receivers Designed to Use Oil as a Heat Transfer Fluid

Mlatho

2011

ISRN Renewable Energy

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A parabolic dish concentrator (PDC) has been designed to be used for charging a thermal energy storage (TES) that is for indirect cooking purpose. Three different receivers have been designed, fabricated, and their performance tested experimentally. The three designs are Volumetric Flask (VF), Volumetric Box (VB), and Conical Tube (CT) receivers. The receivers have been fabricated to use oil as a heat transfer fluid. Of the three designs, the CT receiver has the highest efficiency for a given flow rate, thus making it the best receiver. A positive displacement pump was also designed and constructed for the experimental tests. The pump is used to drive the oil through the receivers and also to act as a flow meter. Thus a low-cost and high-temperature positive displacement pump and a flow meter have been designed and fabricated for use in solar thermal studies.

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Section: Design and Description Of The Receiversmentioning

confidence: 99%

Section: Design and Description Of The Receiversmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Performance of Solar Receivers Designed to Use Oil as a Heat Transfer Fluid

Mlatho

2011

ISRN Renewable Energy

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“…The model results were then validated against the experimental results. The two receivers were developed and built for use with an SK-14 parabolic dish reflector (Mlatho et al 2010) in order to charge a thermal energy storage system (Mawire and McPherson 2008) to be used in an indirect solar cooker being designed by our group (Mawire and McPherson 2008, Mawire et al 2009, Mlatho et al 2010). …”

Section: Introductionmentioning

confidence: 99%

Performance optimisation of solar receivers that use oil as a heat transfer fluid

Mlatho

McPherson

2013

International Journal of Sustainable Energy

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This article presents the use of a wire mesh in optimising the performance of two volumetric solar receivers that use oil as a heat transfer fluid. Computational fluid dynamics models have been used to optimise the receivers. Varied parameters (including the use of a wire mesh) of the receiver models were changed in the optimisation process. Based on the models, prototype receivers were developed and tested. After that, the models were validated against experiments and the results compare well. The results indicate that the use of a wire mesh placed inside a receiver improves its performance. An optimal wire mesh porosity was found as ≈0.95 mainly because the efficiency is increased without inducing an adverse pressure drop inside the receiver.

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“…In order to increase the heat transfer surfaces and consequently the transfer efficiency, the use of wire mesh, ceramic absorbers and other porous materials in these receivers has been applied with the aim of increase their efficiency [3]; [9]; [10]; [11]; [12]; [13], [14]. The reviewed references don't indicate a large use of volumetric receivers applied on indirect solar heat exchangers that have a separate solar collector followed by a power unit or thermal energy storage system [15], [16], [17]. Moreover, these receivers have mainly been used with air as a HTF and metal foams as the porous media.…”

Section: Introductionmentioning

confidence: 99%

An efficient parabolic dish engine based on Rankine cycle

García¹,

Carril²,

Catoira³

et al. 2012

REPQJ

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Abstract. In this research work, a case study carried out to evaluate the technical viability of a parabolic dish based concentrator to convert solar energy into electric power by means of a high performance Rankine cycle operating with, ethane, ammonia or water. The comparison of such cycles in terms of thermal efficiency and net developed work is the aim of the proposed research. The achieved results show that Stirling engine efficiency is so far lower than that of the Rankine cycle under the same operating temperatures since typical temperatures range from 650 °C to 800 °C resulting in Stirling engine conversion efficiencies of around 30 % to 40 %, while the proposed Rankine cycles can surpass such mark.

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Determination of the spatial extent of the focal point of a parabolic dish reflector using a red laser diode

Cited by 4 publications

References 10 publications

Experimental Performance of Solar Receivers Designed to Use Oil as a Heat Transfer Fluid

Experimental Performance of Solar Receivers Designed to Use Oil as a Heat Transfer Fluid

Performance optimisation of solar receivers that use oil as a heat transfer fluid

An efficient parabolic dish engine based on Rankine cycle

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