Heat-Loss Testing of Solel's UVAC3 Parabolic Trough Receiver

Burkholder, Frank; Kutscher, C.

doi:10.2172/922153

Cited by 75 publications

(44 citation statements)

References 5 publications

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“…With increased concentration ratios, improved heat transfer performance of the receiver tubes becomes essential to reduce absorber tube temperatures, reduce absorber tube temperature gradients and, subsequently, reduce receiver thermal loss at these elevated temperatures [9,10]. It has also been shown in previous studies [11,12] that increasing concentration ratios increase the entropy generation rates in parabolic trough receivers, reducing their thermodynamic performance.…”

Section: Introductionmentioning

confidence: 94%

Thermodynamic optimisation of the performance of a parabolic trough receiver using synthetic oil–Al 2 O 3 nanofluid

2015

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In this paper, results of a thermodynamic analysis using the entropy generation minimisation method for a parabolic trough receiver tube making use of a synthetic oil-Al 2 O 3 nanofluid as a heat transfer fluid are presented. A parabolic trough collector system with a rim angle of Nanoparticle volume fractions in the range 0 ≤ ϕ ≤ 8% were used. The local entropy generation rates due to fluid flow and heat transfer were determined numerically and used for the thermodynamic analysis. The study shows that using nanofluids improves the thermal efficiency of the receiver by up to 7.6%. There is an optimal Reynolds number at each inlet temperature and volume fraction for which the entropy generated is a minimum. The optimal Reynolds number decreases as the volume fraction increases. There is also a Reynolds number at every inlet temperature and volume fraction beyond which use of nanofluids is thermodynamically undesirable.

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Section: Introductionmentioning

confidence: 94%

Thermodynamic optimisation of the performance of a parabolic trough receiver using synthetic oil–Al 2 O 3 nanofluid

2015

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“…For a receiver whose annulus space is evacuated to very low pressures, the convective heat loss term between the absorber tube and the glass cover becomes very small and can be neglected [3]. Detailed thermal modelling and measurement of receiver thermal loss can be found in studies by Foristall [42] and Burkholder and Kutscher [9,10]. In this work, the thermal and thermodynamic performance of the receiver is investigated numerically.…”

Section: Physical Modelmentioning

confidence: 99%

“…As the concentration ratios increase, it can be expected that the receiver thermal loss and heat transfer irreversibilities will increase due to the high temperatures and temperature gradients at these high concentration ratios [9][10][11]. To improve the thermal performance of the receiver as the concentration ratios increase, heat transfer enhancement will play a significant role.…”

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confidence: 99%

Thermal performance and entropy generation analysis of a high concentration ratio parabolic trough solar collector with Cu-Therminol®VP-1 nanofluid

Mwesigye

Huan

Meyer

2016

Energy Conversion and Management

201

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This paper presents results of a numerical study on the thermal and thermodynamic performance of a high concentration ratio parabolic trough solar collector using Cu- Above a certain Reynolds number, further increase in the Reynolds numbers makes the entropy generation higher than that of a receiver with only the base fluid. Key wordsConcentration ratio, entropy generation, nanofluid, parabolic trough receiver, thermal efficiency. †

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“…Solving Equations (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12) gives the distributions for velocity, temperature, pressure and turbulent quantities inside the absorber tube. Since entropy for single-phase flow is a function of temperature and pressure, it can be obtained in the post-processing phase of a CFD simulation.…”

Section: Entropy Generationmentioning

confidence: 99%

Numerical investigation of entropy generation in a parabolic trough receiver at different concentration ratios

Mwesigye

Bello‐Ochende

Meyer

2013

Energy

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This paper presents results of a numerical analysis of entropy generation in a parabolic trough receiver at different concentration ratios, inlet temperatures and flow rates. Using temperature dependent thermal properties of the heat transfer fluid, the entropy generation due to heat transfer across a finite temperature difference and entropy generation due to fluid friction in the receiver has been determined. Results show a reduction in the entropy generation rate as the inlet temperature increases and an increase in the entropy generation rate as the concentration ratio increases. Results further show that, there is an optimal flow rate at which the entropy generated is a minimum, for every combination of concentration ratio and inlet temperature. The optimal flow rates at which the entropy generated is minimum are 11.974×10 -3 , 15.395×10 -3 , 18.817×10 -3 , and 22.238×10 -3 and 25.659×10 -3 m 3 /s when the concentration ratio is 40, 60 80 100 and 120 respectively, irrespective of the inlet temperature considered. For the range of inlet temperatures, flow rates and concentration ratios considered, the Bejan number, which measures the contribution of entropy generation due to heat transfer irreversibility to the total entropy generation rate is about 1 at low flow rates and is between 0-0.24 at the highest flow rate.

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Heat-Loss Testing of Solel's UVAC3 Parabolic Trough Receiver

Cited by 75 publications

References 5 publications

Thermodynamic optimisation of the performance of a parabolic trough receiver using synthetic oil–Al 2 O 3 nanofluid

Thermodynamic optimisation of the performance of a parabolic trough receiver using synthetic oil–Al 2 O 3 nanofluid

Thermal performance and entropy generation analysis of a high concentration ratio parabolic trough solar collector with Cu-Therminol®VP-1 nanofluid

Numerical investigation of entropy generation in a parabolic trough receiver at different concentration ratios

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