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 11 of 11 for “"Second law efficiency"”.
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Irreversibilities and nonidealities in desalination systems
… and a useful benchmark for evaluating energetic efficiency of separation processes. All separation processes are subject to these energy requirements; several cases relevant to established and emerging desalination technologies are considered. The effect of nonidealities in electrolyte solutions …
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Experimental study of reversible AC/HP system for electric vehicles
… electric vehicles (EV), the energy conversion efficiency is much higher, so that there isn't much waste heat available for cabin heating. A general way to provide heat for EV is to use a positive temperature coefficient (PTC) heater to convert electricity stored in the battery directly into …
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Membrane distillation for high salinity desalination
… distillation systems typically have low energy efficiency. Multistage membrane distillation (MD) systems can have significantly higher efficiencies than their single stage counterparts. However, multistage MD system design has received limited attention. In this work, the performance of a …
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Heat exchanger design for thermoelectric electricity generation from low temperature flue gas streams
… material with a ZT value of 0.8 and second law efficiency of 13%. Complete systems were generated for a number of economic conditions. The best complete system achieved a first law efficiency of 1.62% from a 1500 C flue gas stream at an installed cost of $0.79 per watt.
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Monovalent selective electrodialysis : optimizing energetics for desalination and mineral recovery
… selectivity, specific energy consumption, and second law efficiencies for different system conditions. An optimization study was also carried out to determine the optimal operating parameters for the MSED system. The optimized system led to a decrease in specific energy consumption and an …
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Design of a hybrid energy-generation system for autonomous kayaks
… matched them to the alternator to maximize the efficiency of the system. The overall second law efficiency of the system was determined as 0.165, from the lower heating value of the diesel to the electric power delivered to the trolling motor. Each of the various components was sized accordingly …
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Planning energy systems for small, rural communities (including economic, technical and thermodynamic criteria)
… assessment three parameters are used: exergy, second law efficiency and energy quality. Energy quality against quantity diagrams (on which areas represent exergy) are shown to be a useful way of visualising thermodynamic system performance. This work also develops methods which can be used to …
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Investigations on Solar Powered Direct Contact Membrane Distillation
… vapor transport across the membrane. It has low second law efficiency due to parasitic heat losses. The objective of the first part of the investigation is to thoroughly analyze a Direct Contact Membrane Distillation (DCMD) system from the view point of yield and exergy. The insights from exergy …
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Design And Optimization Of Organic Rankine Cycle For Low Temperature Geothermal Power Plant
… from low temperature geothermal resources. The second hypothesis for this research is redesigning the ORC system for the given resource condition will improve efficiency along with improving economics.</p> <p>ORC model was developed using process simulator and validated with the data obtained …
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Osmotic mass exchangers for power generation and energy recovery : analysis and analogy to heat exchangers
… approximation. It is also found that the maximum Second Law efficiency of the power achievable from a one-dimensional PRO membrane is 66.48%. For large membrane areas, the maximum power for a PRO membrane occurs at a hydraulic pressure difference that is not equal to exactly one-half the osmotic …
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Thermochemical energy storage systems: modelling, analysis and design
… the effects of selected parameters on the efficiency and behavior of thermochemical storage systems.