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Transient models and characteristics of once-through line focus Systems

Feldhoff, Jan Fabian and Hirsch, Tobias and Pitz-Paal, Robert and Valenzuela, Loreto (2015) Transient models and characteristics of once-through line focus Systems. Energy Procedia, 69, pp. 626-637. Elsevier. ISSN 1876-6102

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Official URL: http://www.sciencedirect.com/science/article/pii/S1876610215003781

Abstract

A transient model is the basis for understanding the characteristics of dynamic systems. It must always be a tradeoff between (modeling and computational) effort and the desired output. Thus, it is necessary for complex systems to develop special models adapted to the purpose. This has been performed for the case of direct steam generation (DSG) in parabolic trough or linear Fresnel solar fields, in which there is a long section of two-phase flow. In the once-through mode (OTM), feed water from the power block is directed to the inlet of a loop. The water is then preheated, completely evaporated and superheated along the loop. This paper presents two different types of transient models for such systems. A discretized finite element model is used for detailed system characteristics and understanding. A second moving boundary model is developed which includes the combination of lumped parameters with distributed information. This fast model can especially be used for control studies and model based predictive controllers. Both models are compared against experimental data and differences regarding various system characteristics are shown. Further models like linear transfer functions in the time-domain are mentioned and an overall overview on transient DSG models is provided.

Item URL in elib:https://elib.dlr.de/98951/
Document Type:Article
Title:Transient models and characteristics of once-through line focus Systems
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Feldhoff, Jan FabianJan.Feldhoff (at) dlr.dehttps://orcid.org/0000-0003-1636-5429
Hirsch, Tobiastobias.hirsch (at) dlr.dehttps://orcid.org/0000-0003-0063-0128
Pitz-Paal, RobertRobert.Pitz-Paal (at) dlr.dehttps://orcid.org/0000-0002-3542-3391
Valenzuela, LoretoCIEMAT-PSAUNSPECIFIED
Date:May 2015
Journal or Publication Title:Energy Procedia
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:69
Page Range:pp. 626-637
Publisher:Elsevier
ISSN:1876-6102
Status:Published
Keywords:transient modeling; moving boundary model; direct steam generation; solar-thermal once-through boiler; parabolic trough
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Systems (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Line-Focusing Systems (old)
Location: Stuttgart
Institutes and Institutions:Institute of Solar Research > Linienfokussierende Systeme
Deposited By: Feldhoff, Dr.-Ing. Jan Fabian
Deposited On:04 Nov 2015 13:44
Last Modified:06 Sep 2019 15:22

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