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 29 for “"Cell temperature"”.
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Solar Cell Temperature Dependent Efficiency and Very High Temperature Efficiency Limits
… seen substantial growth in recent years. Solar cells can convert sun light directly into electrical energy, and much progress has been made in making them less expensive and more efficient. Solar cells are often characterized and modeled at 25 °C, which is significantly lower than their peak …
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Thermal analysis of a concentrating photovoltaic receiver
… is also generated which results in increases in cell temperature. However, as the cell temperature increases, the efficiency of the PV cells drops---a 40°C increase in temperature for this unit cuts performance by 25%. An algorithm has been developed to predict the maximum cell temperature and …
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Control-Oriented Thermal Model for a Hybrid Vehicle Battery
… Lithium-ion batteries have a narrow range of temperature within which they can be operated efficiently. Operation of Lithium-ion batteries outside this range decreases the life of batteries and reduces performance of the vehicle. Due to this limitation, it is important to prevent overheating …
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Modeling and control of fuel cell-battery hybrid energy sources
… Among various alternative energy systems, fuel cells and batteries have attracted significant attention both in academia and industry considering their superior performances and numerous advantages. In this dissertation, the modeling and control of these two electrochemical sources as the main …
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Design and implementation of liquid cooling system for ArchiMITes vehicle
… Calculations indicate that the battery cell temperature will be 17.39 'C above the ambient temperature. This temperature difference incorporates a factor of safety of 2. Further studies on battery placement, working fluid fill methods, and fan and pump control are recommended.
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Evaluation of alternative cooling techniques for photovoltaic panels
… in this area. The combined use of photovoltaic cells and thermoelectric modules is another thrust of this research. Two innovative systems are proposed and investigated including combined photovoltaic-thermoelectric power generation system (PV-TEG) and combined photovoltaic-thermoelectric …
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Modeling and multi-objective optimization of a photovoltaic-thermal based multigeneration system
… or mirrors. Concentrated light increases the cell temperature significantly. The cell is cooled down using a heat transfer fluid. This heat is being transferred to an organic Rankine cycle which not only produces electricity but also produces hot water for domestic applications. The organic …
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Growth and use of Carbon Nanotube Nanoforests as Gas Diffusion Layers in Industrial-Scale Proton Exchange Membrane Fuel Cells
Proton exchange membrane fuel cells are promising sources of electrical energy for stationary generation, transportation, portable and backup power. The performance is greatly impacted by a variety of factors including cell temperature, gas flow rates, reactant humidification, and water management. …
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It's getting hot in here : temperature gradients in lithium-ion battery packs
… were tested to determine the magnitude of the temperature gradient over the pack. The battery blocks were stacked vertically, similar to how they might be situated on an electric vehicle. They were cycled, discharged then charged, at a current of 40A in stacks of one, two, three and four, with …
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Thermal property of EDS film and its effect on the removal of dust particles as a function of surface temperature
… very low energy. However, the high ambient temperature in deserts leads to a decrease of efficiency of the silicon solar panels, and the EDS film has a potential influence on increasing temperature of the panels. This thesis focuses on the thermal property of EDS film and to determine its …
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Evaluation of process parameters and membranes for SO2 electrolysis
… as an energy carrier, can be applied in a fuel cell setup for the production of electrical energy. Although various methods of hydrogen production are available, sulphur-based thermochemical processes (such as the Hybrid Sulfur Process (HyS)) are favoured as alternative options for large scale …
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Performance Characteriztion and Modeling of a Passive Direct Methanol Fuel Cell (DMFC) over a Range of Operating Temperatures and Relative Humidities
… more effective means of energy production, fuel cells become increasingly more popular. While different fuel cells are already found in industry today, the direct methanol fuel cell (DMFC) is becoming an increasingly more probable means for portable power production. In such applications a …
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A nickel hexacyanoferrate based thermo-electrochemical device For efficient heat-to-electricity conversion
… against the climate crisis. Currently, low-temperature waste heat accounts for more than half of the rejected waste thermal energy produced in the United States. Traditional waste heat recovery methods such as steam cycle and thermoelectrics fall short at low temperatures due to …
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Techno-economic modelling and optimization of second life battery packs, with a particular focus on accommodating inhomogeneities and module-to-module variations
… of a mathematical model for SLBs from cell to pack level, incorporating an offline SOH estimation method. This model enables the development of BMS algorithms specifically designed for SLBs and allows for accurate estimation of the remaining life of the battery pack, leading to more …
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Recharging the facade : designing and constructing novel BIPV assemblies
… of the system: optimal tilt angle and high cell temperature. Low cell efficiency will continue to hinder BIPV's penetration in the market without design strategies that ensure higher yields. This thesis presents the design, development, and construction of two novel BIPV products. One is …
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Using High-Powered, Frequency-Narrowed Lasers For Rb/129Xe and Cs/129Xe Spin-Exchange Optical Pumping To Achieve Improved Production of Highly Spin-Polarized Xenon For Use In Magnetic Resonance Applications
… an anomalous dependence of the optimal OP cell temperature on the in-cell xenon density; the low-field set-up is also used to examine the build-up of nuclear spin polarization in the OP cell as it occurs. The tenth chapter covers the use of high power, frequency-narrowed light sources that …
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Experimental investigations of molecules desorbing from a cold surface with buffer gas cooling and broadband roational spectroscopy : applications in astrochemistry
… and to determine the effective rotational temperature of molecules within the buffer gas cell following direct vapor injection into the cell. The 1.7GHz broadband spectra shows unambiguous detection of n-PrCN conformers and a rotational temperature of 30K, ~5K higher than the buffer gas …
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Computer simulation of stand-alone photovoltaic systems with battery storage
… models of the POA irradiance, the photovoltaic cell · temperature and the battery temperature to simulate the environmental conditions of the system. These require hourly weather data as input. Typical meteorological years, which constitute a suitable form of input weather data, have been …
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Ultraviolet (UV) Laser Implementation, Signal Model, and Measurement Sensitivities in Filtered Rayleigh Scattering for Aerodynamic Flows
… measurements of three-component velocity, static temperature, and static density of aerodynamic flows. Development of the FRS technique has typically employed 532 nm Nd:YAG lasers coupled with the use of iodine vapor cells as the molecular filter. One method to improve the effective …
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Study to characterise the performance of micro tubular solid oxide fuel cells by the invention of an avant garde experimental apparatus and computational modelling.
… development of Micro Tubular Solid Oxide Fuel Cells (MT-SOFCs) and provides a body of information for any future MT-SOFC stack or testing apparatus design. This information has been achieved through a combination of experimental work, CFD modelling and numerical analysis. CFD models with an …
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