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 80 for “"Heat energy"”.
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Low Power IC Design with Regulated Output Voltage and Maximum Power Point Tracking for Body Heat Energy Harvesting
… as they limit lifetime and scalability. Energy harvesting from body heat provides a solution to these limitations. Energy can be harvested from body heat using thermoelectric generators, or TEGs. TEGs provide a continuous, scalable, solid-state energy source ideal for wearable and …
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Use of PV/T panels to meet the building loads of light commercialized buildings
… 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 absorbing …
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UAB "Mažeikių šilumos tinklai" veiklos ir perspektyvų ekonominis vertinimas /
… stability (including continuous provision of heat energy to consumers) – instillation of cogeneration plants. The Paper presents the values of economic indicators (financial stability, liquidity, business activity, profitability, etc.) for the period of 2003 – 2007 year and the expected …
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Modelling directional casting processes in which heat conduction and cavity radiation are the dominant modes of heat transfer
… complex interactions of various mechanisms of heat and mass thansfer in spatially complex domains and in the presence of a change of phase. In particular, the transfer of heat within the furnace occurs in the form of conduction, convection and radiation. This thesis addresses the development of …
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Waste heat recovery in automobile engines : potential solutions and benefits
Less than 30% of the energy in a gallon of gasoline reaches the wheels of a typical car; most of the remaining energy is lost as heat. Since most of the energy consumed by an internal combustion engine is wasted, capturing much of that wasted energy can provide a large increase in energy …
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Thermal Numerical Analysis of Vertical Heat Extraction Systems in Landfills
… to the operation of a vertical ground source heat pump (i.e., heat extraction system, HES). Elevated landfill temperatures, reported various researchers, impact the engineering performance of landfill systems. A numerical model was developed to analyze the influence of vertical HES operation …
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Thermodynamic analysis of a three-fluid absorption refrigeration machine
… refrigeration system operating on lowgrade (heat) energy. In particular the temperature-time response of the various components of a domestic size absorption unit were investigated with respect to the pressure of hydrogen in the system under varying power input. Design modifications of the …
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Exploring wellbore and reservoir temperature profiles in fluid circulation and production operations
<p>"The wellbore heat flow occurs during different well operations resulting from any temperature differences between the wellbore fluid and the adjacent formation. Understanding the direction and mechanism of heat flow whether it is conduction or convection help to represent this heat exchange …
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The temperature distribution on a rotating cylindrical shell in the presence of a primary radiative source and a reflecting and radiating infinite plane
… The plane is assumed to radiate and reflect heat energy diffusely. Convective heat transfer from the outer surface is neglected, but radially inward heat transfer is present and is governed by a constant overall heat transfer coefficient. The non-linear problem is approximated through a …
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Simulation of peanut drying incorporating air recirculation
To determine the energy saving potential available from recirculating air in peanut drying, a thin layer drying simulation model was adapted to incorporate recirculation. A heat and mass balance computer model was developed to enable the determination of heat energy input. Laboratory crop dryers …
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The temperature distribution on a spherical shell in the presence of a primary radiative source and a reflecting and radiating infinite plane
… assumed to radiate diffusely as well as reflect heat energy. Convective heat transfer as well as radial conduction in the shell is neglected. The non-linear differential equation obtained from a heat balance made on a volume element of the shell is approximated by a linearized equation. The …
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Low-grade heat conversion into electricity by thermoelectric and electrochemical systems
… 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 performance and …
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Evaluation of an aluminum latent heat storage system for the fluoride-salt-cooled high-temperature reactor
Latent heat energy storage (LHS) systems offer multiple advantages over sensible heat storage systems in terms of energy density, cost, and cycle efficiency. LHS systems use a phase change medium (PCM) that transfer heat at constant temperature. The use of metallic PCMs allows LHS to be used with …
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Finite-Difference Modeling of the Batch Process Smoldering Combustion of Wastewater
… assuming one-dimensional transient conductive heat transfer. The time-dependent temperature profiles within the column represented the main parameters of interest and were used to verify recoverable heat energy estimations. Given that the modeling method used for this thesis represents a unique …
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Efficient Regeneration Of Chemical Solvents For Carbon Dioxide Capture By Polymeric Membrane Contactors
… with individual parametric study results. Heat energy efficiency characterization of this system showed that roughly half of the heat energy was used for the stripping process at 80ºC and above. The membrane material candidates screening experiment results showed that polypropylene and …
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Improving efficiency of ID thermopower wave devices and studying 2D reaction waves
With growing energy consumption, current research in the field is focused on improving and developing alternatives for energy storage and conversion. Factors such as efficiency of energy conversion, usability of this converted form of energy, power density, energy density etc. help us in …
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Improving energy efficiency : (turning wasted heat into cash flow)
… to Goals transformation versus the current waste heat recovery solutions and their stated goals. 1. Critical: Implementation of a sustainable financial plan which can help to initiate an increase in waste heat recovery 2. Critical: Deployment of waste heat recovery strategies for reducing …
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Energy Recovery from Oil Sands Reservoirs
… has high emissions intensity with large energy requirements. The research presented here studied the SAGD process from multiple angles. The first study is focused on the edge of steam chamber where both SAGD and Steam and Gas Push (SAGP) processes were compared to understand the impact of …
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Integration of a cob separation system into a biomass harvesting combine
… many uses were found. A renewed interest in the heat/energy value of the cob has increased the focus on harvesting corn cobs. A corn cob separation system was developed and installed on a single pass biomass harvesting combine. The system included a blower and two fans and the combine was capable …
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Investigation of air control on chunkwood combustor
… curing, use significant quantities of thermal energy. Direct combustion of biomass is a potential source of heat energy for those agricultural applications to substitute for the electricity or fossil fuels (principally LP gas) currently used. However, small scale combustion equipment often …
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