Thermal hydraulic RELAP5 model for a solar direct steam generation system based on parabolic trough collectors operating in once-through mode

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

doi:10.1016/j.energy.2017.05.156

Cited by 30 publications

(6 citation statements)

References 25 publications

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“…The Reactor Excursion and Leak Analysis Program (RELAP5) is a best-estimate nuclear system code; it was developed at Idaho National Engineering Laboratory (INEL) at the request of the US Nuclear Regulatory Commission (NRC) [15]. It is mainly used for the transients' analysis of light-water reactor (LWR); however, the generalization of the RELAP5 code allowed its application to the nuclear and nonnuclear fields [1,4,11]. It has been designed to simulate the thermal-hydraulic behavior of installations during accidental or incidental transients.…”

Section: Relap5/mod32 Code Presentationmentioning

confidence: 99%

“…However, modeling and simulation are also effective tools for safety assessment and prediction of installation behavior of real process under transient conditions. The usefulness of numerical simulation tools is mainly based on the development of numerical methods, the progress of programming, and the provision of powerful computing resources [4].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of the Accidental Transient of an Industrial Steam Boiler

Cheridi¹,

Chaker²,

Loubar³

2019

Heat and Mass Transfer - Advances in Science and Technology Applications

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Numerical simulation allows a better understanding of thermal-hydraulic phenomena that can take place in thermal installations. It is a capital contribution, especially in accident situations. The code RELAP5/Mod3.2 makes it possible to predict the thermal-hydraulic behavior of these installations during the normal and accidental operations. The present chapter focuses on accidental transient modeling and simulation of an industrial steam boiler by the code RELAP5/Mod3.2. This steam boiler is radiant type, high power, natural circulation, and a single drum. The model of the boiler developed for the RELAP5/Mod3.2 code encompasses the entire installation. The control loop of the water level in the steam drum and the superheated steam temperature are also included in the model. The qualification process of the steam boiler model is based on the steam boiler operation data under steady-state operating conditions. The comparative study shows that the theoretical results of the code RELAP5 are in good agreement with the operating data of the installation. To evaluate the behavior and response of the boiler in accident situations, the loss of feedwater following pump power loss, with and without protective operations, was simulated.

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Section: Relap5/mod32 Code Presentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Accidental Transient of an Industrial Steam Boiler

Cheridi¹,

Chaker²,

Loubar³

2019

Heat and Mass Transfer - Advances in Science and Technology Applications

View full text Add to dashboard Cite

show abstract

“…A simulation model for DSG in PTCs is developed in TRNSYS [5], results are validated with real data at the DISS facility. A thermal hydraulic RELAP5 DSG PTC model was validated against the DISS facility in [28], a new experimental correlation for heat losses was also provided. A non-linear dynamic model of once-through DSG PTCs was developed in [18], transfer functions of outlet fluid temperature and mass flow rate were also derived.…”

Section: Nomenclaturementioning

confidence: 99%

Steady-state and dynamic validation of a parabolic through collector model using the ThermoCycle Modelica library

Bonilla¹

2018

Preprint

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Small-capacity (<200 kWel) concentrated solar power plants has been recognized as a promising technology for micro power applications. In particular, parabolic through collectors have been identified as the most promising focusing technology. In this context, physics-based dynamic model of parabolic through constitutes a significant tool for the further development of the technology, allowing to evaluate and optimize response times during transients, or to implement and test innovative control strategies. In this contribution, the dynamic model of a parabolic trough line t based on the ThermoCycle Modelica library is validated against steady-state and transient experimental results from the parabolic through test loop available at the Plataforma Solar de Almería, Spain. The simulation results are in good agreement with the measurements, both in steady-state and in transient conditions. The validated model is readily usable to investigate demanding dynamics-based problems for low capacity solar power systems.

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“…Design optimization of the once-through DSG trough collector and steady-state operation strategy of the DSG collector are analyzed and discussed in these works. Serrano-Aguilera et al [13] provided the thermal hydraulic RELAP5 model for a DSG parabolic trough system. Eck [14], [15] established the non-linear dynamic model of DSG trough collector in recirculation mode based on the Modelica language and an explicit differential equation set was established.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Solar Field in Direct Steam Generation Parabolic Trough Based on Heat Transfer Mechanism and Artificial Neural Network

Guo

Pei

et al. 2020

IEEE Access

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Accurate calculation of water/steam temperature and pressure in the solar field of direct steam generation (DSG) parabolic trough is essential to power dispatch and control. However, it is very difficult to achieve satisfied accuracy in limited time because of the existence of two-phase flow that has complex dynamic characteristics. In this work, a new hybrid model is proposed, which is based on the heat transfer mechanism enhanced by artificial neural network. This hybrid model has two characteristics as follows.(1) A heat-transfer and hydrodynamic coupling steady-state mechanism model as a prior model, which is used to quickly obtain the prior values including mechanism factors that are then used as input to an artificial neural network (ANN) model. (2) An ANN model consisting of two four-hidden-layer back propagation (BP) networks. The inlet pressure and outlet temperature of solar field are modelled in the first four-layer neural network, and then the outlet temperature of solar field is analyzed in the second four-layer neural network to improve the simulation accuracy. This model is verified by the data from DISS plant on 26 June 2001, and can be used for control studies and dispatching optimization. The calculation results show that the mean absolute percentage error (MAPE) of predicted inlet pressure and outlet temperature are 0.48% and 1.14%, respectively, which are better than the results of BP model, general regression neural network (GRNN) model, hybrid model with one BP network mentioned in this paper, and the dynamic simulation model mentioned in the literature.INDEX TERMS Direct steam generation, parabolic trough, heat transfer mechanism, deep neural network, combining prediction model, working fluid parameters.

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Thermal hydraulic RELAP5 model for a solar direct steam generation system based on parabolic trough collectors operating in once-through mode

Cited by 30 publications

References 25 publications

Numerical Simulation of the Accidental Transient of an Industrial Steam Boiler

Numerical Simulation of the Accidental Transient of an Industrial Steam Boiler

Steady-state and dynamic validation of a parabolic through collector model using the ThermoCycle Modelica library

Modeling of Solar Field in Direct Steam Generation Parabolic Trough Based on Heat Transfer Mechanism and Artificial Neural Network

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