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 96 for “"heat losses"”.
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Heat losses in internal combustion engines
This thesis deals with the effects of cooling and heat losses in internal combustion engines. The object of this work was to examine and research various cooling concepts and methods to reduce heat loss to engine coolant, improve thermal efficiency and to predict heat transfer values for these …
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Thermal effects of heat losses from an insulated oil-shale sample
Includes bibliographical references.
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A computer model for the heat losses in the exhaust manifold of an internal combustion engine
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1986.
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Evaluation of Metabolic Energy Expenditure During Prolonged Steady-State Exercise
… to radiant, convective and evaporative heat and the energy for climbing and walking. Healthy, non-obese subjects, ages 20 to 35 years, were classified as 5 active males, 5 trained males, 5 active females and 5 trained females. Active subjects ran $$30 mi./wk., had significantly greater …
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An electrical network model for computing current distribution in a spirally wound lithium ion cell
… they are used in mainstream vehicles, because of heating issues that may lead to thermal runaway. This work aims at supplementing the existing electrochemical heat distribution model of a spirally wound lithium ion battery with an electrical network that can model the heat losses due to electric …
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Thermal aspects of high efficiency channel with conventional and alternative fuels in SuperCritical water-cooled reactor (SCWR) applications
… of 350°C and 625°C. Consequently, the sheath and fuel centerline temperatures are higher in SCWRs than those of the current nuclear reactors. Previous studies have shown that the sheath and fuel centerline temperatures could exceed the design and industry accepted limits of 850°C and …
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A study of the effects of firing different sizes of coal in No.6 boiler
The sensible heat losses in the flue gases was exceeding the best economical operating ranges of the Boiler No. 6. This was done to study the adverse effect on the flue dust carryover in the furnace.
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From atoms to cities : A bottom-up analysis of infrastructure materials and systems
… bottom-up framework to seamlessly connect the heat transport through the molecular structure of construction materials to thermal energy losses at the city level. Separated by twelve orders of magnitude in length scales, from nanometers to kilometers, this provides a chance to link ideas in …
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Arabian Sea mixed layer deepening during the monsoon : observations and dynamics
… flux, driven by large radiative and latent heat losses at the sea surface. Convective entrainment is the primary local mechanism driving the observed mixed layer cooling and deepening, although horizontal advection of thermocline depth variations affect the depth which the mixed layer …
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Downdraft gasification of biomass
… the performance of both reactors by reducing heat losses resulting in a reduced air to feed ratio requirement. The hybrid gasifier gave a higher energy conversion efficiency, a higher product gas heating value, and a lower tar content than the open-core gasifier due to efficient gas mixing in …
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Basic relation for the recovery of oil by steam application to an oil and hot water system
… numerically for typical reservoir conditions. Heat losses to the overlying and underlying formations were included, and certain simplifying assumptions were made to facilitate numerical treatment of the problem by the method of characteristics. General trends of the dependence of temperature …
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The Investigation of Combustion and Emissions of Jp8 Fuel in an Auxiliary Power Unit
… in correlation with the amount of JP-8. The heat release for all blends displayed a similar development compared with the diesel fuel, the premixed phase being combined diffusion combustion. The maximum combustion pressure remained relatively constant for all fuel blends. The maximum …
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Detecting sources of heat loss in residential buildings from infrared imaging
… to determine the most common sources of heat loss during the winter in residential buildings. 135 houses in the greater Boston and Cambridge area were photographed, stitched, and tallied to characterize nine major causes of heat loss: window frames, window surfaces, window cracks, …
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Evaluation and Application of Thermal Modeling for High Power Motor Improvements
… motor improvements in the ability to handle heat losses of approximately forty percent greater than the baseline, resulting in either higher power or lower motor temperatures for the same package size.
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Experimental investigations of using silica aerogel to harvest unconcetrated sunlight in a solar thermal receiver
Significant demand exists for solar thermal heat in the mid-temperature ranges (120 oC – 220 oC). Generating heat in this range requires expensive optics or vacuum systems in order to utilize the diluted solar energy flux reaching the earth’s surface. Current flat plate solar collectors have …
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Numerical simulation of forward combustion in a radial system
… in a radial system in which there are conductive heat losses to the surrounding formations, three phase fluid flow, conductive-convective heat transfer within the producing formation, combustion, and aqueous-phase changes considered. The mathematical form of the temperature equation requires that …
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Gas acceleration by travelling conduction waves
… 10⁸J/kg and 4 to 20 atm. respectively. Measured heat losses were low compared to other gas accelerating devices, measured efficiencies lying in the range 70% to 90% .
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Gas acceleration by travelling conduction waves
… 10⁸J/kg and 4 to 20 atm. respectively. Measured heat losses were low compared to other gas accelerating devices, measured efficiencies lying in the range 70% to 90% .
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Analysis of the injection of a heated, turbulent jet into a moving mainstream, with emphasis on a thermal discharge in a waterway
… such as turbulence, entrainment, buoyancy, and heat transfer. The analytical results are supported by experimental data and demonstrate the usefulness of the theory for estimating the location and size of the effluent with respect to the discharge point. The capability of predicting jet flow …
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Experimental and Numerical Investigation on Particle-gas Flows in Open Vortex-based Solar Cavity Receivers
… through the open aperture of the receiver, heating the particles in a suspension to provide good heat transfer to the gas phase. The complexity of the gas and particle flow behaviour within it, such as particle egress through the aperture and convective heat losses under solar radiation, …
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