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 20 for “"Heat engines"”.
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LOW DIMENSIONAL CARBON BASED ORGANIC THERMOELECTRIC COMPOSITES: SYNTHESIS, CHARACTERIZATION, AND PERFORMANCE
… magnitude below that required to replace current heat engine power sources. Alternatively, one potential solution is to consider using thermoelectrics in low powered applications where their efficiencies are comparable to those of standard heat engines, and where the use of heat engines is …
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Solution Synthesized Nanostructured Thermoelectric Materials
Thermoelectric heat engines are currently used in several niche applications for electricity generation and cooling. Many additional applications would be practical if thermoelectric materials with improved figures of merit could be made. Over the past twenty years, many nanostructured materials …
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The VT1 Shape Memory Alloy Heat Engine Design
… a period of intense interest in the area of heat engines in the late 70's and early 80's. It was believed that these engines could use heat from low temperature sources such as solar heated water, geothermal hot water and rejected heat from conventional engines as a significant source of …
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Novel Three-Dimensional Silicon Carbide Nano-Structures
… require optimal mechanical properties in high heat and oxidation. The first structure involves covering continuous silicon carbide fiber with protruding silicon carbide nanotubes, dubbed “fuzzy” fiber, which is created to be woven, layered, and put inside a ceramic matrix for extremely high …
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Engineering the Whirlwind
… suggesting they can be usefully analysed as heat engines, converting Convectively Available Potential Energy (CAPE) contained in a rising columnar core, into rotational kinetic energy. The cold reservoir of the heat engine is considered as being located at the point where the coherent vortex …
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Quantum correlations and thermal machines
… In the first part we formulate a selection of heat engines with two-qubit systems, utilising environments that induce quantum correlations into the system. We see that these correlations can have some effects on the work of the engine, but this effect is system dependent. <br/><br/>Describing …
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Low-grade Thermal Energy Harvesting and Waste Heat Recovery
Low-grade heat, either in the form of waste heat or natural heat, represents an extremely promising source of renewable energy. A cost-effective method for recovering the low-grade heat will have a transformative impact on the overall energy scenario. Efficiency of heat engines deteriorates with …
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Development of a liquid-fueled micro-combustor
… the development of shirtbutton-sized gas turbine engines for use as portable power sources. As part of an effort to develop a microscale gas turbine engine, this thesis presents the modeling, design, fabrication, and experimental characterization of a microcombustor that catalytically burns JP8 …
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Numerical study of jet impingement cooling on a smooth curve surface
… are a best method of achieving particularly high heat transfer coefficient and are therefore employed in many engineering applications. In this study we seek to understand the mechanism of the distributed heat on the curve surface with the goal of identifying preferred methods to predicting jet …
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Rapid premixing fuel-water injector in burner combustion
The alternative fuel is attract good attention from worldwide especially for renewable and prevention energy such as biodiesel. Biodiesel is one of the hydrocarbon fuels and it has potential for external combustion. This research used biodiesel Crude Palm Oil (CPO) as fuels in which have been blend …
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The experimental study and numerical simulation of falling liquid film flow on horizontal tubes
… was conducted to explore the characteristics of heat transfer coefficients. In this study, the intertube spacing from smallest size of 8 mm and up to 100 mm were analyzed for Reynolds number range of 300 to 3300. The experimental data was extracted from calibrated test rig and the effect is …
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Solar thermoelectrics for small scale power generation
… the thermoelectric devices can be used as heat engines to convert heat into electricity. With no moving parts, the generators are considered highly reliable with low maintenance, which is essential for decentralized power source. With nearly 1.6 billion people living without basic …
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Contribution to the Characterization of Piston Expanders for Their Use in Small-scale Power Production Systems
… for small scale power generation (<50kW) using heat engines such as Ericsson engine or Organic Rankine Cycle (ORC) system. Both systems offer the possibility to use renewable energy sources and are increasingly considered in light of the economic and environmental context. This thesis aims at …
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Exergy analysis of a Stirling cycle
… of a 1000 cm³ Stirling engine with finite heat capacity rates at the source and the sink. The Stirling engine has many advantages over other heat engines, as it is extremely quiet, has multi-fuel capabilities and is highly efficient. There is also significant interest in using Stirling …
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Modelling and control of heat exchanger by using bio-inspired algorithm
Heat exchanger is a heat transfer device that is used for transfer of thermal energy between two or more fluids available at different temperature. Based on the previous study referred, the same data of heat exchanger had been used but different types of model were used to find the structural model …
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Conversion of a scroll compressor to an expander for organic Rankine cycle: modeling and analysis
Conversion of a scroll compressor to an expander for organic Rankine Cycle: modeling and analysis
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Thermoelectric device characterization and solar thermoelectric system modeling
… (TE) devices can be used either as heat pumps for localized environmental control or heat engines to convert heat into electricity. Thermoelectrics are appealing because they have no moving parts, are highly reliable, have high power densities, and are scalable in size. They can be …