Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 44 for “"thermal system"”.
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Long-term analysis of a small-scale concentrated photovoltaic-thermal system with a nanoparticle-based optical filter
… and implementation of solar energy conversion systems, with an overall goal of reducing fossil fuel dependence. One example of such systems is a concentrated photovoltaic-thermal (CPV-T) system that uses nanofluid-based optical filters, which can generate electricity and absorb heat from …
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A modular approach to high throughput microsystems
A modular high throughput microsystem was developed using microfabrication technology and nucleic acid analysis. The purpose of developing this microsystem is to identify acute infectious disease and prevent contagious outbreak in a matter of time. This microsystem included three major components, …
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An average modeling approach of hybrid power systems for use in mobile refrigeration applications
… averaging-based models of hybrid electric power systems for refrigeration units in delivery trucks. The background of the mobile refrigeration industry is stated, and the motivation of the proposed hybrid-powered ac motor drive is discussed. The model is intended to be used for an industry power …
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Bayesian-based simulation model validation for spacecraft thermal systems
… last several decades of space flight, spacecraft thermal system modeling software has advanced significantly, but the model validation process, in general, has changed very little. Although most thermal systems are successful, there is evidence of some model inaccuracy and thermal system …
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Comprehensive Modeling of Novel Thermal Systems: Investigation of Cascaded Thermoelectrics and Bio-Inspired Thermal Protection Systems Performance
Thermal systems involve multiple components assembled to store or transfer heat for power, cooling, or insulation purpose, and this research focuses on modeling the performance of two novel thermal systems that are capable of functioning in environments subjected to high heat fluxes. The first …
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Multivariable controller design using pareto front
A multivariable thermal system with two inputs and two outputs is investigated. Its inputs are a pair of heaters controlled by a computer while its outputs are temperatures measured by two sensors. The system is fully interactive so two different controller structures can be used to ensure that the …
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The importance of selecting the optimal number of principal components for fault detection using principal component analysis
… and effective fault detection in a laboratory thermal system. SNR method of determining number of PCs, which is a relatively recent method, has been compared to two commonly used methods for the same, the CPV and the scree test methods.
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Design of a thermal control system for an IC test-in-tray handler
… integrated circuit (IC) test handler thermal system, and its implementation in the development of a new commercially-sold product. The test handler is a manufacturing machine that automates the mechanical handling of IC devices for testing at any temperature in the range of-60°C to …
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Thermal Performance Comparison of Three Integrated Thermal Solar Roof Collectors
The integrated solar roof collector system can bring the house year-round energy saving benefit. In heating season, part of the space heating and preheating domestic hot water demand can be met by this integrated system. In the cooling season, cooling load reduction and preheating domestic hot …
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Cryogenic heat pipe for cooling high temperature superconductors with application to Electromagnetic Formation Flight Satellites
… the HTS wire needs a cryogenic thermal control system to maintain the wire temperature below the critical temperature and this temperature must be maintained over the entire EMFF coil, which could be as large as two meters in diameter. For commercially available HTS wire, this …
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Controllability and Observability of a Large Scale Thermodynamical System via Connectability Approach
… observability of a large scale nonlinear dynamic thermal system using graph-theory. The novelty of this method is in adapting graph theory for nonlinear class and establishing a graphic condition that describes the necessary and sufficient terms for a nonlinear class system to be controllable and …
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The oscillogenic control algorithm
… sensor component consisted of a forced air thermal system with air flow rates ranging from 8.4 to 3l kg/hr. The oscillogenic instrument's frequency was, over the limited range tested (0.032 to 0.062 hz), a linear indication of the thermal system's convective heat transfer coefficient, which …
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Model-Based Control Development for an Advanced Thermal Management System for Automotive Powertrains
… improvements and technical solutions, advanced Thermal Management Systems (TMS) have been recently developed to more efficiently manage the thermal loads produced by internal combustion engines and thereby reduce fuel consumption. Advanced TMS include complex networks of coolant, oil and …
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Dynamic and thermal control of an electromagnetic formation flight testbed
… all times. Using traditional thruster propulsion systems can be costly and life-limiting since the propellant is consumed during the mission. An alternative method for providing this relative position control is to use electromagnetic interaction between the vehicles of the formation to provide …
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Improvements to solar thermoelectric generators through device design
… explores two device level improvements to STEG systems. First, thin-film STEGs are explored as a method to potentially reduce the manufacturing costs of STEG systems. It is shown through modeling that thin-film STEGs have only a slight degradation in performance compared to bulk STEGs when …
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Modeling and simulation of commercial aircraft electrical systems
… and dynamics of commercial aircraft electrical systems. This was done by creating a toolset composed of the crucial elements to model an aircraft electrical system that consists of power sources, power conversion, power distribution, and electrical loads. The considerations for the component …
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Theory and Experiments of Scattering From Microscale Random Rough and Deterministic Surfaces
… in various engineering disciplines including thermal system design, optical remote sensing and photorealistic image generation. A combined experimental and theoretical investigation has been conducted for surfaces which have surface length scales on the order of the incident wavelength. A …
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Characterization and design of non-adiabatic micro-compressor impeller and preliminary design of self-sustained micro engine system
… to improve micro-turbomachinery and overall system performance. Three-dimensional Reynolds-averaged Navier-Stokes computations (FLUENT) have been carried out to quantify the performance limiting processes in micro-impellers. These processes include (i) heat transfer to the compressor flow …
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