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

Mlatho, Justice

doi:10.5402/2011/851764

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…The volume flow rate of the pump is obtained from the product of rev/s and volume per revolution (vol/rev) obtained during calibration of the pumps. The volume flow rate of pump P1 was also verified by use of a high precision Macnaught M series flow meter as explained in reference (Mlatho 2011).…”

Section: Experimental Techniquesmentioning

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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Section: Experimental Techniquesmentioning

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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Performance testing of a Fresnel/Stirling micro solar energy conversion system

Aksoy

Karabulut

2013

Energy Conversion and Management

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Characterization of Local Nano‐Heat Transfer Fluids for Solar Thermal Collection

Kawira

2020

Advances in Materials Science and Engineering

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Performance of organic oils in solar thermal collection is limited due to their low thermal conductivity when they are compared to molten salt solutions. Extraction of organic oils from plants can be locally achieved. The purpose of this study was to investigate the effect of use of copper nanoparticles in some base local heat transfer fluids (HTFs). Addition of volume fraction of 1.2% of the copper nanoparticles to oil-based heat transfer fluids improved their thermal conductivity as deduced from the thermal heat they conducted from solar radiation. The oil-based copper nanofluids were obtained by preparation of a colloidal solution of the nanoparticles. Impurities were added to increase the boiling point of the nano-heat transfer fluids. Stabilizers were used to keep the particles suspended in the oil-based fluids. The power output of the oil-based copper nano-heat transfer fluids was in the range of 475.4 W to 1130 W. The heat capacity of the steam in the heat exchanger was 93.7% dry and had a thermal capacity of 5.71 × 103 kJ. The heat rate of flow of the oil-based copper nano-heat transfer fluids was an average of 72.7 Js−1·kg−1 to 89.1 Js−1·kg−1. The thermal efficiency for the oil-based copper nano-heat transfer fluids ranged from 0.85 to 0.91. The average solar thermal solar intensity was in the range 700 Wm−2 to 1180 Wm−2. The heat exchanger used in this study was operating at 4.15 × 103 kJ and a temperature of 500.0°C. The heat transfer fluids entered the exchanger at an average temperature of 381°C and exited at 96.3°C and their heat coefficient ranged between 290.1 Wm−2°C and 254.1 Wm−2°C. The average temperatures of operation ranged between 394.1°C and 219.7°C with respective temperature efficiencies ranging between 93.4% and 64.4%. It was established that utilization of copper nanoparticles to enhance heat transfer in oil-based local heat transfer fluids can mitigate energy demand for meeting the world’s increasing energy uses, especially for areas inaccessible due to poor land terrain.

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

Cited by 4 publications

References 15 publications

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

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

Performance testing of a Fresnel/Stirling micro solar energy conversion system

Characterization of Local Nano‐Heat Transfer Fluids for Solar Thermal Collection

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