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Development of a Volume Element Model for Energy Systems Engineering and Integrative Thermodynamic Optimization

Title: The Development of a Volume Element Model for Energy Systems Engineering and Integrative Thermodynamic Optimization.
Name(s): Yang, Sam, author
Kopriva, David A., university representative
Hruda, Simone P. (Simone Peterson), committee member
Van Sciver, Steven W., committee member
Florida State University, degree granting institution
College of Engineering, degree granting college
Department of Mechanical Engineering, degree granting department
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2016
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource (148 pages)
Language(s): English
Abstract/Description: The dissertation presents the mathematical formulation, experimental validation, and application of a volume element model (VEM) devised for modeling, simulation, and optimization of energy systems in their early design stages. The proposed model combines existing modeling techniques and experimental adjustment to formulate a reduced-order model, while retaining sufficient accuracy to serve as a practical system-level design analysis and optimization tool. In the VEM, the physical domain under consideration is discretized in space using lumped hexahedral elements (i.e., volume elements), and the governing equations for the variable of interest are applied to each element to quantify diverse types of flows that cross it. Subsequently, a system of algebraic and ordinary differential equations is solved with respect to time and scalar (e.g., temperature, relative humidity, etc.) fields are obtained in both spatial and temporal domains. The VEM is capable of capturing and predicting dynamic physical behaviors in the entire system domain (i.e., at system level), including mutual interactions among system constituents, as well as with their respective surroundings and cooling systems, if any. The VEM is also generalizable; that is, the model can be easily adapted to simulate and optimize diverse systems of different scales and complexity and attain numerical convergence with sufficient accuracy. Both the capability and generalizability of the VEM are demonstrated in the dissertation via thermal modeling and simulation of an Off-Grid Zero Emissions Building, an all-electric ship, and a vapor compression refrigeration (VCR) system. Furthermore, the potential of the VEM as an optimization tool is presented through the integrative thermodynamic optimization of a VCR system, whose results are used to evaluate the trade-offs between various objective functions, namely, coefficient of performance, second law efficiency, pull-down time, and refrigerated space temperature, in both transient and steady-state operations.
Identifier: FSU_2016SU_Yang_fsu_0071E_13370 (IID)
Submitted Note: A Dissertation submitted to the Department of Mechanical Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Degree Awarded: Summer Semester 2016.
Date of Defense: July 7, 2016.
Keywords: energy systems, system-level modeling, systems engineering, thermal simulation, thermodynamic optimization, volume element model
Bibliography Note: Includes bibliographical references.
Advisory Committee: Juan C. Ordo˜nez, Professor Directing Dissertation; David A. Kopriva, University Representative; Simone P. Hruda, Committee Member; Steven W. Van Sciver, Committee Member.
Subject(s): Mechanical engineering
Force and energy
Persistent Link to This Record:
Owner Institution: FSU

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Yang, S. (2016). The Development of a Volume Element Model for Energy Systems Engineering and Integrative Thermodynamic Optimization. Retrieved from