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Modelling and optimization of transient processes in line focusing power plants with single-phase heat transfer medium

Noureldin, Kareem and González-Escalda, Leopoldo M. and Hirsch, Tobias and Nouri, Bijan and Pitz-Paal, Robert (2016) Modelling and optimization of transient processes in line focusing power plants with single-phase heat transfer medium. In: AIP Conference Proceedings (1734). AIP. SolarPACES 2015, 13-16 Oct 2015, Kapstadt, Südafrika. doi: 10.1063/1.4949169.

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Official URL: http://dx.doi.org/10.1063/1.4949169


A large number of commercial and research line focusing solar power plants are in operation and under development. Such plants include parabolic trough collectors (PTC) or linear Fresnel using thermal oil or molten salt as the heat transfer medium (HTM). However, the continuously varying and dynamic solar condition represent a big challenge for the plant control in order to optimize its power production and to keep the operation safe. A better understanding of the behaviour of such power plants under transient conditions will help reduce defocusing instances, improve field control, and hence, increase the energy yield and confidence in this new technology. Computational methods are very powerful and cost-e�ective tools to gain such understanding. However, most simulation models described in literature assume equal mass flow distributions among the parallel loops in the field or totally decouple the flow and thermal conditions. In this paper, a new numerical model to simulate a whole solar field with single-phase HTM is described. The proposed model consists of a hydraulic part and a thermal part that are coupled to account for the e�ect of the thermal condition of the field on the flow distribution among the parallel loops. The model is specifically designed for large line-focusing solar fields o�ering a high degree of flexibility in terms of layout, condition of the mirrors, and spatially resolved DNI data. Moreover, the model results have been compared to other simulation tools, as well as experimental and plant data, and the results show very good agreement. The model can provide more precise data to the control algorithms to improve the plant control. In addition, short-term and accurate spatially discretized DNI forecasts can be used as input to predict the field behaviour in-advance. In this paper, the hydraulic and thermal parts, as well as the coupling procedure, are described and some validation results and results of simulating an example field are shown.

Item URL in elib:https://elib.dlr.de/108671/
Document Type:Conference or Workshop Item (Speech)
Title:Modelling and optimization of transient processes in line focusing power plants with single-phase heat transfer medium
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Noureldin, KareemUNSPECIFIEDhttps://orcid.org/0000-0003-3833-2425UNSPECIFIED
González-Escalda, Leopoldo M.Marquesado SolarUNSPECIFIEDUNSPECIFIED
Hirsch, TobiasUNSPECIFIEDhttps://orcid.org/0000-0003-0063-0128UNSPECIFIED
Pitz-Paal, RobertUNSPECIFIEDhttps://orcid.org/0000-0002-3542-3391UNSPECIFIED
Journal or Publication Title:AIP Conference Proceedings
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:CSP, parabolic trough, Simulation tool, transient
Event Title:SolarPACES 2015
Event Location:Kapstadt, Südafrika
Event Type:international Conference
Event Dates:13-16 Oct 2015
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Advanced Heat Transfer Media (old)
Location: Stuttgart
Institutes and Institutions:Institute of Solar Research > Linienfokussierende Systeme
Deposited By: Noureldin, Kareem
Deposited On:01 Dec 2016 19:43
Last Modified:09 Feb 2017 19:22

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