Test results, Industrial Solar Technology parabolic trough solar collector

Dudley, V.E.; Evans, Lyndon R; Matthews, C.W.

doi:10.2172/211613

Cited by 55 publications

(36 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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%

See 1 more Smart Citation

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

Mwesigye

Bello‐Ochende

Meyer

2013

Energy

View full text Add to dashboard Cite

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.

show abstract

Section: Entropy Generationmentioning

confidence: 99%

“…Dudley et al [5,6] used the AZTRAK rotating platform at SANDIA National Laboratories to study the performance of SEGS LS-2 and industrial solar technology solar collectors respectively. Liu et al [7] developed an experimental platform to investigate parabolic trough performance.…”

Section: Introductionmentioning

confidence: 99%

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

Mwesigye

Bello‐Ochende

Meyer

2013

Energy

View full text Add to dashboard Cite

show abstract

“…The conventional receiver consists of an evacuated glass envelope to minimize the convection heat loss and a selectively coated absorber tube to minimize the radiation heat loss [2]. Numerous studies have been carried out to characterize the thermal performance of the receiver and to determine the thermal loss at different receiver conditions [4][5][6][7][8][9]. From these studies, it has been shown that: the thermal loss is majorly dependent on the state of the annulus space between the glass cover and the absorber tube, the absorber tube selective coating, the temperature of the absorber tube, the wind speed and the heat transfer from the absorber tube to the heat transfer fluid.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer and thermodynamic performance of a parabolic trough receiver with centrally placed perforated plate inserts

2014

View full text Add to dashboard Cite

In this paper, a numerical investigation of thermal and thermodynamic performance of a receiver for a parabolic trough solar collector with perforated plate inserts is presented. The analysis was carried out for different perforated plate geometrical parameters including dimensionless plate orientation angle, the dimensionless plate spacing, and the dimensionless plate diameter. The Reynolds number varies in the range 1.02×10 4 ≤ Re ≤ 7.38 × 10 5 depending on the heat transfer fluid temperature. The fluid temperatures used are 400 K, 500 K, 600 K and 650 K. The porosity of the plate was fixed at 0.65. The study shows that, for a given value of insert orientation, insert spacing and insert size, there is a range of Reynolds numbers for which the thermal performance of the receiver improves with the use of perforated plate inserts. In this range, the modified thermal efficiency increases between 1.2 -8 %. The thermodynamic performance of the receiver due to inclusion of perforated plate inserts is shown to improve for flow rates lower than 0.01205 m 3 /s. Receiver temperature gradients are shown to reduce with the use of inserts. Correlations for Nusselt number and friction factor were also derived and presented.

show abstract

“…This derivative is set equal to zero, according to Equation (20), the fact that means optimum operation.…”

Section: Optimum Operation Temperaturementioning

confidence: 99%

“…The optimum value for the parameter (X) is obtained by solving arithmetically the Equation (21). The Equation (21) is a result of the combination of Equations (16) and (20).…”

Section: Optimum Operation Temperaturementioning

confidence: 99%

A Realistic Approach of the Maximum Work Extraction from Solar Thermal Collectors

Bellos

Tzivanidis

2018

ASI

View full text Add to dashboard Cite

Abstract:In this study, the maximum work extraction from the incident solar energy on solar thermal collectors is investigated by coupling solar collectors with a Carnot machine. A simplified thermal model for the solar collector performance is developed in which the radiation losses play a significant role. In every examined case, the optimum operating temperature that leads to maximum work extraction is calculated. The final results are presented parametrically, covering a great variety of real solar collectors. Moreover, the validation procedure of the developed model proves high accuracy. The results show that non-concentrating collectors should operate up to 400 K while concentrating collectors in higher temperature levels. More specifically, a parabolic trough collector can operate efficiently in temperature levels up to 850 K, while solar dish collectors can operate efficiently in temperature levels up to 1100 K. The results of this study can be exploited for the preliminary design and optimization of solar thermal systems. Moreover, a clear and realistic upper limit concerning the exergy production of solar irradiation with solar thermal collectors is given.

show abstract

Test results, Industrial Solar Technology parabolic trough solar collector

Cited by 55 publications

References 0 publications

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

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

Heat transfer and thermodynamic performance of a parabolic trough receiver with centrally placed perforated plate inserts

A Realistic Approach of the Maximum Work Extraction from Solar Thermal Collectors

Contact Info

Product

Resources

About