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 23 for “"low-grade heat"”.
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Low-grade heat conversion into electricity by thermoelectric and electrochemical systems
… cost effective technologies that convert low-grade heat into electricity is essential to meet the increasing demand for renewable energy systems. Thermoelectric and recently emergent electrochemical heat conversion devices are promising candidates for this purpose. However, current …
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Development and assessment of a novel osmotic heat engine for energy generation from low-grade heat
… a clean and secure energy future. The osmotic heat engine (OHE) is a closed-loop, membrane based process that utilizes low-grade heat and salinity-gradient energy between two streams for electrical energy generation. The OHE couples pressure retarded osmosis (PRO), an osmotically driven …
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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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ANALYSIS OF A ROTATING SPOOL EXPANDER FOR ORGANIC RANKINE CYCLE APPLICATIONS
Increasing interest in recovering or utilizing low-grade heat for power generation
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Use of PV/T panels to meet the building loads of light commercialized buildings
… of producing simultaneously electric power and low-grade heat energy by absorbing the solar energy striking on its surface. A simple mathematical model is developed to estimate the electric power and heat energy gained by the PV/T panel. A water-to-water heat pump is employed that operates by …
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Design of organic Rankine cycles for conversion of waste heat in a polygeneration plant
… steam Rankine cycles for the conversion of low grade heat sources, where steam cycles are known to be less efficient and more expensive. This work examines organic Rankine cycles for use in a polygeneration plant that converts coal feedstock into hydrocarbon products and electricity. Since a …
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Evaporative drying of cupric-chloride droplets in a thermo-chemical cycle of hydrogen production
… cycle for generation of hydrogen. Utilizing low-grade heat from nuclear or industrial sources to assist drying of Cupric-Chloride can increase efficiency of the overall process. Analytical correlations for heat and mass transfer are developed and applied to the analysis of a solution of …
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Analyzing the effect of pressure drop on flow rate of hot water in the intercoolers assembly of the Lean Operation Rotary Adsorption Cooling System
… system, a novel idea using a readily available low-grade heat and using desiccant wheel to provide a cooling power, was tested this semester. Specifically, this experimental study focuses on the pressure drop of hot water in the two intercoolers that are part of the desiccant wheel module and …
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Design and manufacturing of novel hybrid metal-polymer heat exchangers
Nearly 60% of waste heat from industrial processes in the U.S. lies in low-temperature regime (<200°C). Current conventional metal heat exchangers for waste heat recovery (WHR) of low-grade heat are too expensive and subject to corrosion from condensates below <150°C. Polymers, although an …
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Design and manufacturing of novel hybrid metal-polymer heat exchangers
… from industrial processes is in the form of low-grade heat (200◦C). Materials and maintenance costs of common heat exchangers are typically too high to justify their usage. Polymers, though more affordable, are usually unsuitable for heat exchanger applications due to their low thermal …
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A study of organic Rankine cycle systems with the expansion process performed by twin screw machines
… of energy systems that recover power from low grade heat is one of the most important requirements for reducing their investment cost and optimising system efficiency. The aim of this work was to study, model and analyse an Organic Rankine cycle (ORC) system using a twin screw expander to …
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Investigation of Membrane Fouling and Cleaning in Direct Contact Membrane Distillation of Municipal Wastewater
… municipal wastewater treatment plants with a low grade heat source for direct potable reuse. This project investigated the chemical cleaning efficiency of ethylenediaminetetraacetic acid (EDTA) on membrane wastewater effluent fouling for direct contact membrane distillation (DCMD) to help …
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A Novel Technique for the Separation of Dilute Butanol from Aqueous Fermentation Broths
… produced, the alcohol is generally expressed at low concentrations (~1 wt%) in these fermentations. It also inhibits the organisms, and so removal of the butanol from the fermentation vessel as it is produced can improve the productivity of the fermentation. However, separation of dilute butanol …
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Solar Process Heat in the Food Industry – Methodological Analysis and Design of a Sustainable Process Heat Supply System in a Brewery and a Dairy
… in the form of thermal energy at medium to low temperatures. Fossil fuels remain the dominant sources of this energy. This combination provides various possibilities to reduce energy consumption and CO2 emissions with heat recovery, but also with the integration of solar process heat. Energy …
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Performance analysis of gas turbine cogeneration systems.
… approach to generating electricity and process heat from the same fuel source. It is an approach of utilizing waste energy products for a useful purpose that significantly improves the optimal provision of the different grades of energy from high-quality, high-grade electricity or power to low …
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Development of adsorption-based atmospheric water harvesting and thermal energy storage technologies
… (MOFs), with high sorption capacity and low regeneration temperature requirements, allow us to efficiently utilize them for these applications. However, detailed experimental and theoretical frameworks for the use of advanced sorbents have not considered several important aspects (e.g., …
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Experimental design, analysis and improvement of a Marnoch Heat Engine with heat recovery.
… research examines the prototyping of a Marnoch Heat Engine (MHE) and conducts thermodynamic and heat transfer analyses of this heat engine with a waste heat recovery system. The heat source for the MHE can be low grade heat (about 365 K). During cold seasons an ambient temperature can be …
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Unified Total Site Heat Integration: Targeting, Optimisation and Network Design
… in New Zealand use 214.3 PJ of process heat, of which approximately 65 % is fossil fuels. Despite increasing energy demands, depleting fossil fuel resources, and pressure to reduce Greenhouse Gas emissions, low grade heat in large-scale processing sites is still not fully utilised. This …
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Nanofluidics: Fundamentals and Applications in Energy Conversion
… various environmental energy sources, including low grade heat, vibrations, and human motion. Moreover, by taking advantage of the inverse process of the energy absorption/harvesting, thermally/electrically controllable actuators can be designed with simultaneous volume memory characteristics and …
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Multifunctional Materials for Energy Harvesting and Sensing
… suspended CNT sheets having extremely low heat capacity per unit area opens an opportunity for utilizing thermoacoustic phenomenon (electrical to thermal to acoustic energy conversion) that results in sound generation over a wide range of frequencies. Detailed theoretical modeling and …
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