Thermal 3D model for Direct Solar Steam Generation under superheated conditions

Serrano-Aguilera, J.J.; Valenzuela, Loreto; Parras, Luis

doi:10.1016/j.apenergy.2014.07.035

Cited by 64 publications

(21 citation statements)

References 26 publications

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“…Most of the existing optical models simplify this distribution with a Gaussian [31] or rectangular [33] profile which has some error respect to realistic distribution. Other optical models [6,26,45] use a complex stochastic Monte Carlo Method which has a high computational cost.…”

Section: Optical Modelmentioning

confidence: 99%

“…The model includes the optical errors in what is called intercept factor γ and also the effect of the incident angle [6]. The previous optical model has been improved to take into consideration the effects of other optical errors that can change not only the magnitude of the absorbed solar flux but also the profile, namely eccentricity and thermal bending.…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

“…However, power plants based on DSG might lead to a more complex thermo-hydraulic process [6,7]. On the one hand, the thermal performance of the PTC plants is affected in the steam phase section due to the sudden decrease of the heat transfer coefficient.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, several software tools have been proposed to solve the thermo-hydraulic behavior inside a DSG collector. Several commercial computational fluid dynamic CFD models were used to solve the superheated steam section [33,6] and for the whole DSG loop [19,34]. In these studies, the CFD model solves the thermo-hydraulic behavior inside the absorber pipes without considering the realistic non-uniform flux around the absorber tube for the three different sections (preheating, boiling and superheating).…”

Section: Introductionmentioning

confidence: 99%

“…Other DSG models were based on numerical tools such as Modelica language [35,36], RELAP [37], ATHLET [38] and TRNSYS [39] for dealing with the dynamic simulation of DSG parabolic trough solar collectors. Elsafi [6] presented a complete flow pattern analysis along the DSG absorber tube and discussed the flow transitions in different sections of the DSG loop considering a constant heat flux distribution around the receiver. In his work, the flow pattern map proposed by Wotjan et al [40] was used to predict the flow pattern in the DSG loops.…”

Section: Introductionmentioning

confidence: 99%

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Thermo-hydraulic analysis and numerical simulation of a parabolic trough solar collector for direct steam generation

2018

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Direct Steam Generation (DSG) is one of the most promising alternatives for parabolic trough solar plants to replace the synthetic oil and reduce the electricity cost. The focus of this work is to develop a comprehensive optical and thermo-hydraulic model for the performance prediction of DSG process under real operating conditions. Pressure drop and heat transfer characteristics are determined considering the effect of the non-uniform heat flux distribution due to the concentration of the sunlight. A numerical-geometrical method based on ray trace and finite volume method techniques is used to determine the solar flux distribution around the absorber tube with high accuracy. A heat transfer model based on energy balance is applied to predict the thermal performances of the different flow regimes in the DSG loop. The thermo-hydraulic behavior of the different DSG sections i.e. preheating, evaporation and superheating is investigated under different operating conditions. The validity of the model has been tested by being compared with experimental data from DISS test facility and other available models in the literature. The study also presents a comparative study of the effect of different parameters on the thermal gradient around the absorber tube. The analysis shows that the highest thermal gradient is occurring in the superheating section with a high risk of thermal bending and a potential damage risk. The model is also capable to evaluate the efficiency of a DSG loop for different conditions and help to take the appropriate control strategies to avoid flow instabilities in the DSG rows.

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Section: Optical Modelmentioning

confidence: 99%

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermo-hydraulic analysis and numerical simulation of a parabolic trough solar collector for direct steam generation

2018

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Dynamic Modeling of Solar Parabolic Trough Collector—A Review

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Pattanayak,

Ray

2024

Evolutionary Manufacturing, Design and Operational Practices for Resource and Environmental Sustainability

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Eulerian multiphase study of direct steam generation in parabolic trough with OpenFOAM

Achi

Demagh

2022

Heat Trans

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Direct steam generation (DSG) in parabolic trough solar collectors is a feasible option for economic improvement in solar thermal power generation. Three‐dimensional Eulerian two‐fluid simulations are performed under OpenFOAM to study the turbulent flow in the evaporation section of the parabolic trough receiver and investigate the phase change, and pressure drop of water as a heat transfer fluid. First, the model's validity has been tested by comparing the numerical results of a laboratory scale boiler with the available correlations and semi‐correlations of boiling flows from the literature. Simulations agreed well with Rouhani–Axelsson correlation for horizontal tubes, with a mean relative error of less than 7.1% for all studied cases. However, despite a mean relative error of less than 13.19% compared to the experimental data in the literature, the reported pressure drop factor remains valid; overprediction remains tolerable for most engineering applications. Second, the scaling effect on the mathematical model, from laboratory to commercial‐scale configuration, was tested with experimental data of the DISS test loop in Platforma Solar de Almeria, Spain. The Monte Carlo Ray Tracing method under the Tonatiuh package allowed for obtaining the nonuniform heat flux distribution. Due to the large size of the evaporation section in the DISS loop (eight collectors), each collector is considered independently in the simulations. Thus, simulations follow each other, taking the numerical results of each collector output as input data in the next collector and so on until the last. The numerical results showed an excellent agreement for the void fraction with 3.53% against the Rouhani–Axelsson correlation. Frictional pressure losses are within a 17.06% error of the Friedel correlation, in the range of previous work in the literature, and the heat loss is less than 4.69% error versus experimental correlation.

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Thermal 3D model for Direct Solar Steam Generation under superheated conditions

Cited by 64 publications

References 26 publications

Thermo-hydraulic analysis and numerical simulation of a parabolic trough solar collector for direct steam generation

Thermo-hydraulic analysis and numerical simulation of a parabolic trough solar collector for direct steam generation

Dynamic Modeling of Solar Parabolic Trough Collector—A Review

Eulerian multiphase study of direct steam generation in parabolic trough with OpenFOAM

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