Field Survey of Parabolic Trough Receiver Thermal Performance

Price, Henry; Forristall, R.; Wendelin, Tim; Lewandowski, A.; Moss, Timothy; Gummo, Carin

doi:10.1115/isec2006-99167

Cited by 68 publications

(41 citation statements)

References 5 publications

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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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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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“…[3][4][5][6][7][8][9][10][11][12]. Research on parabolic trough systems entails almost every aspect of the technology ranging from development of highly reflective coatings for the collector, selective coatings for the receiver's absorber tube, development of heat transfer fluids, cost reduction measures and others [6,13,14].…”

Section: Introductionmentioning

confidence: 99%

Minimum entropy generation due to heat transfer and fluid friction in a parabolic trough receiver with non-uniform heat flux at different rim angles and concentration ratios

Mwesigye

Bello‐Ochende

2014

Energy

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In this paper, Monte Carlo ray-tracing and computational fluid dynamics are used to numerically investigate the minimum entropy generation due to heat transfer and fluid friction in a parabolic trough receiver. The analysis was carried out for rim angles in the range 40 o -120 o , concentration ratios in the range 57-143, Reynolds numbers in the range 1.02×10 4 -1.36 ×10 6 and fluid temperatures in the range 350 -650K. Results show existence of an optimal Reynolds number at any given combination of fluid temperature, concentration ratio and rim angle for which the total entropy generation is a minimum. The total entropy generation was found to increase as the rim angle reduced, concentration ratio increased and fluid temperature reduced. The high entropy generation rates at low rim angles are mainly due to high peak temperatures in the absorber tube at these low rim angles. Keywords:

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“…While all carbon based degradation products are accumulating in the HTF until they are cleaned off by an ullage system, different assumptions have to be made for hydrogen due to its ability to permeate through iron based metals. The general aspects of hydrogen generation and permeation and the risks for the operation of the plant are well known [1], [2], [3], [4] and will be only briefly described at this point.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen generation in CSP plants and maintenance of DPO/BP heat transfer fluids – A simulation approach

Kuckelkorn

Jung²,

Gnädig

et al. 2016

AIP Conference Proceedings

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Archimede solar energy molten salt parabolic trough demo plant: Improvements and second year of operation AIP Conference Proceedings 1734, 100007 (2016) Abstract. The ageing of diphenyl oxide/ biphenyl (DPO/BP) Heat Transfer Fluids (HTFs) implies challenging tasks for operators of parabolic trough power plants in order to find the economic optimum between plant performance and O&M costs. Focusing on the generation of hydrogen, which is effecting from the HTF ageing process, the balance of hydrogen pressure in the HTF is simulated for different operation scenarios. Accelerated build-up of hydrogen pressure in the HTF is causing increased permeation into the annular vacuum space of the installed receivers and must be avoided in order to maintain the performance of these components. Therefore, the effective hydrogen partial pressure in the HTF has to be controlled and limited according to the specified values so that the vacuum lifetime of the receivers and the overall plant performance can be ensured. In order to simulate and visualize the hydrogen balance of a typical parabolic trough plant, initially a simple model is used to calculate the balance of hydrogen in the system and this is described. As input data for the simulation, extrapolated hydrogen generation rates have been used, which were calculated from results of lab tests performed by DLR in Cologne, Germany. Hourly weather data, surface temperatures of the tubing system calculated by using the simulation tool from NREL, and hydrogen permeation rates for stainless steel and carbon steel grades taken from literature have been added to the model. In a first step the effect of HTF ageing, build-up of hydrogen pressure in the HTF and hydrogen loss rates through piping and receiver components have been modeled. In a second step a selective hydrogen removal process has been added to the model. The simulation results are confirming the need of active monitoring and controlling the effective hydrogen partial pressure in parabolic trough solar thermal power plants with DPO/BP HTF. Following the results of the simulation, the expected plant performance can only be achieved over lifetime, if the hydrogen partial pressure is actively controlled and limited.

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Field Survey of Parabolic Trough Receiver Thermal Performance

Cited by 68 publications

References 5 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

Minimum entropy generation due to heat transfer and fluid friction in a parabolic trough receiver with non-uniform heat flux at different rim angles and concentration ratios

Hydrogen generation in CSP plants and maintenance of DPO/BP heat transfer fluids – A simulation approach

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