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The Ohio State University

1.
Hawn, David Phillip.
Development of a Dynamic Model of a Counterflow Compact Heat
Exchanger for Simulation of the *GT*-*MHR* Recuperator using MATLAB and
Simulink.

Degree: MS, Nuclear Engineering, 2009, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1236091152

A computational model was developed to
determine the dynamic behavior of counter flow compact heat
exchangers. This code was written with the intention of becoming a
component of a larger system dynamics model of a Brayton cycle
nuclear power plant. Several configurations for the GT-MHR
recuperator were analyzed, but the code can easily be modified to
analyze many types of compact heat exchangers with a variety of
applications. Helium was the working fluid used in this project,
but the code can be modified to use other gases. This code was
written in Matlab and Simulink but the methods outlined in this
report could be easily reapplied in other programming languages.
This code is also useful for designing counter flow compact heat
exchangers in general. In this model the heat
exchanger is discretized in time and in space. The resolution of
the discretization is defined by the user. Helium properties are
reevaluated for each volume before each time step. The dynamic
inputs to the model are the inlet temperature, mass flow rate and
pressure for each side of the heat exchanger. This model assumes
low Mach number flows and treats the propagation of pressure and
mass flow rate changes as instantaneous. The outlet temperature and
pressure drop for each side is determined. The results of the
simulation were successfully validated against results available in
the literature. Contact the author for a copy of this
code.
*Advisors/Committee Members: Blue, Thomas (Committee Chair).*

Subjects/Keywords: Mechanical Engineering; Nuclear Physics; compact heat exchanger; recuperator; system dynamics; GT-MHR; transient analysis

Record Details Similar Records

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^{th} Edition):

Hawn, D. P. (2009). Development of a Dynamic Model of a Counterflow Compact Heat Exchanger for Simulation of the GT-MHR Recuperator using MATLAB and Simulink. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1236091152

Chicago Manual of Style (16^{th} Edition):

Hawn, David Phillip. “Development of a Dynamic Model of a Counterflow Compact Heat Exchanger for Simulation of the GT-MHR Recuperator using MATLAB and Simulink.” 2009. Masters Thesis, The Ohio State University. Accessed April 19, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1236091152.

MLA Handbook (7^{th} Edition):

Hawn, David Phillip. “Development of a Dynamic Model of a Counterflow Compact Heat Exchanger for Simulation of the GT-MHR Recuperator using MATLAB and Simulink.” 2009. Web. 19 Apr 2019.

Vancouver:

Hawn DP. Development of a Dynamic Model of a Counterflow Compact Heat Exchanger for Simulation of the GT-MHR Recuperator using MATLAB and Simulink. [Internet] [Masters thesis]. The Ohio State University; 2009. [cited 2019 Apr 19]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1236091152.

Council of Science Editors:

Hawn DP. Development of a Dynamic Model of a Counterflow Compact Heat Exchanger for Simulation of the GT-MHR Recuperator using MATLAB and Simulink. [Masters Thesis]. The Ohio State University; 2009. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1236091152

The Ohio State University

2. Khorsandi, Behrooz. Modeling of displacement damage in silicon carbide detectors resulting from neutron irradiation.

Degree: PhD, Nuclear Engineering, 2007, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1173103438

There is considerable interest in developing a power
monitor system for Generation IV reactors (for instance GT-MHR). A
new type of semiconductor radiation detector is under development
based on silicon carbide (SiC) technology for these reactors. SiC
has been selected as the semiconductor material due to its superior
thermal-electrical-neutronic properties. Compared to Si, SiC is a
radiation hard material; however, like Si, the properties of SiC
are changed by irradiation by a large fluence of energetic
neutrons, as a consequence of displacement damage, and that
irradiation decreases the life-time of detectors. Predictions of
displacement damage and the concomitant radiation effects are
important for deciding where the SiC detectors should be placed.
The purpose of this dissertation is to develop computer simulation
methods to estimate the number of various defects created in SiC
detectors, because of neutron irradiation, and predict at what
positions of a reactor, SiC detectors could monitor the neutron
flux with high reliability. The simulation modeling includes
several well-known – and commercial – codes (MCNP5, TRIM, MARLOWE
and VASP), and two kinetic Monte Carlo codes written by the author
(MCASIC and DCRSIC). My dissertation will highlight the
displacement damage that may happen in SiC detectors located in
available positions in the OSURR, GT-MHR and IRIS. As extra
modeling output data, the count rates of SiC for the specified
locations are calculated. A conclusion of this thesis is SiC
detectors that are placed in the thermal neutron region of a
graphite moderator-reflector reactor have a chance to survive at
least one reactor refueling cycle, while their count rates are
acceptably high.
*Advisors/Committee Members: BLUE, Thomas (Advisor).*

Subjects/Keywords: Engineering, Nuclear; Displacement damage; silicon carbide; Monte Carlo methids; count rate; GT-MHR; IRIS

Record Details Similar Records

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^{th} Edition):

Khorsandi, B. (2007). Modeling of displacement damage in silicon carbide detectors resulting from neutron irradiation. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1173103438

Chicago Manual of Style (16^{th} Edition):

Khorsandi, Behrooz. “Modeling of displacement damage in silicon carbide detectors resulting from neutron irradiation.” 2007. Doctoral Dissertation, The Ohio State University. Accessed April 19, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1173103438.

MLA Handbook (7^{th} Edition):

Khorsandi, Behrooz. “Modeling of displacement damage in silicon carbide detectors resulting from neutron irradiation.” 2007. Web. 19 Apr 2019.

Vancouver:

Khorsandi B. Modeling of displacement damage in silicon carbide detectors resulting from neutron irradiation. [Internet] [Doctoral dissertation]. The Ohio State University; 2007. [cited 2019 Apr 19]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1173103438.

Council of Science Editors:

Khorsandi B. Modeling of displacement damage in silicon carbide detectors resulting from neutron irradiation. [Doctoral Dissertation]. The Ohio State University; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1173103438