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Identification, Modeling and Analysis of Energy Losses in a SOFC/GT Hybrid Power Plant

Saletti, Costanza (2017) Identification, Modeling and Analysis of Energy Losses in a SOFC/GT Hybrid Power Plant. Master's, Università di Pisa.

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Official URL: https://etd.adm.unipi.it/theses/available/etd-01182017-201955/


Hybrid power plants consisting of a solid oxide fuel cell (SOFC) and a gas turbine (GT) are an interesting �eld of research due to the expected high electrical e�ciency, fuel exibility and part-load good performance. At DLR (German Aerospace Center), a demonstration SOFC/GT hybrid power plant is being built and its operation is being simulated by means of a global system model that does not account for heat losses. The system models available in literature are adiabatic as well. Though, considering heat losses during stationary operation allows for an improved prediction of the operating range as well as for the prevention of undesired operating problems. Similarly, investigating the heat capacity of the system during transient processes allows for the examination of new possible operating strategies. In the present thesis, the energy losses from the hybrid power plant are identi �ed and modeled, in order to integrate the global system model and enhance its accuracy while keeping a low computational time. Due to the complexity of the system, the high number of components and the loop-type interactions between them, a high computational speed is required to analyze a large number of operating points and boundary conditions. For this purpose, di�erent modeling strategies are compared. Various multidimensional models for the evaluation of heat losses from the components of the hybrid power plant are created in the MATLAB environment for both stationary and transient operation. The real system parameters are implemented by building a database for material properties and components geometries. The results obtained with the di�erent models are then compared in order to choose the paradigm that gives the lowest computational time while maintaining a feasible accuracy. Eventually, a zero-dimensional model is selected for the implementation in the global system simulation, as it meets those requirements. Therefore, a complete set of fast and reliable sub-models for stationary and transient simulations is available to carry on future studies and thoroughly investigate the operation of the SOFC/GT hybrid power plant.

Item URL in elib:https://elib.dlr.de/111470/
Document Type:Thesis (Master's)
Title:Identification, Modeling and Analysis of Energy Losses in a SOFC/GT Hybrid Power Plant
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Date:March 2017
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Number of Pages:88
Keywords:heat transfer, heat loss, hybrid power plant, gas turbine, fuel cell, model
Institution:Università di Pisa
Department:Scuola di Ingegneria
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Fuel cells
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (Fuel Cells) (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Steilen, Mike
Deposited On:13 Mar 2017 12:51
Last Modified:31 Jul 2019 20:08

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