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 47 for “"Cooling Effect"”.
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Performance tests and cooling effect distribution of the V.P.I. forced draft cooling tower
Test data of forced draft cooling towers is all too meager, and that available is, in many instances, incomplete. It is the opinion of the authors that putting cooling tower design on a rational basis can be brought about only by two methods. Either complete and intensive study of all existing …
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Assessing the effects of ethanol addition on particulate matter emissions in GDI engines
Previous research on the effects of ethanol addition on particulate matter (PM) emissions in GDI engines show diverse results. In this thesis, an overview on three major aspects, PM formation, effects of engine operating conditions, and ethanol effects, unveils the large number of factors that can …
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Cooling Machines: Exploring the Heat Mitigation Effect of Urban Trees with Computer Vision
… increasingly turn to planting trees as a way of cooling urban streetscapes. Urban vegetation is indeed known to have a cooling effect, primarily due to trees providing shade and preventing urban materials from heating up, as well as due to their ability to maintain their own internal temperature …
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A Bio-inspired Solution to Mitigate Urban Heat Island Effects
… a result, exacerbating Urban Heat Island (UHI) effects. I sought solutions to this significant engineering issue from nature, and discovered a similar heat island effect in flowers, namely the micro-greenhouse effect. However, a special cooling effect has been observed in a peculiar temperate …
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What to plant and where to plant it; Modeling the biophysical effects of North America temperate forests on climate using the Community Earth System Model
… Earth System Model to assess the biophysical effect of North American temperate forests on climate and how this effect changes with location, tree type, and forest management. We calculated the change in annual temperature and energy balance associated with afforestation with either needle …
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Investigation of static and dynamic enhancement of laminar natural convection cooling of electronics
… control requirements for such devices, more effective and efficient means of cooling electronics are needed. The feasibility of three alternative approaches to enhancing pure natural convection cooling of electronics is investigated in the current research. The three static or dynamic methods …
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Experiment and simulation study on a novel, effective radiative cooing film
Space cooling consumes a large portion of U.S. household use, and traditional air conditioning system poses a net heating effect to the global climate. Daytime radiative cooling (DRC) is a passive cooling method with zero energy consumption. It features a high ultraviolet visible near-infrared …
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Análise teórico-experimental do coeficiente de perfomance (COP) de um sistema de refrigeração por jato-compressão
… heat of energy conversion equipment to produce a cooling effect, consists currently in a very interesting way of efficiency improvement of energy systems. The present research has as intention the theoretical and experimental study of a new intermittent refrigeration system ejector cycle …
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Numerical simulation of acoustic waves in a rectangular chamber
… which uses soundwaves in a chamber to achieve a cooling effect.</p><p>The present study treats the flow numerically. The governing equations are the viscous compressible Navier-Stokes system, assuming a perfect gas. The numerical method employs a finite difference spatial discretization and …
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The Impacts of Wind Farms on Cumulus Development in the Central Great Plains
Cumulus clouds have a net cooling effect on the surface radiative balance by reflecting more downwelling solar radiation than absorbing upwelling terrestrial radiation. As boundary layer cumuli form from buoyant, moist plumes ascending from the surface, their growth may be hindered by the turbulent …
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Energy correlations of prompt neutrons from 252Cf fission
… fission of ²⁵²Cf. The hypothesis that cooling of the fission fragments during the cascade evaporation of prompt neutrons affects the energies of successive neutrons in a cascade has been investigated by a comparison of the energy correlations of coincident neutrons from the same …
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Continuous flash extraction of alcohols from fermentation broth
… of the fluid system in the flash tank to effectively recover the alcohol. Carbon dioxide gas ranging from 4.2L/min to 12.6L/min was used to continuously strip 2 and 12% (v/v) ethanol solution in a fermentor with a recycle. Ethanol and water in the stripped gas was recovered by compressing …
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Investigation of the cooling characteristics of rotating liquids
In this paper, an analysis of the internal water-cooling of a gas turbine was carried out. The density differences due to heating of the water in the blade and drum, combined with the very large force field associated with the centrifugal force caused by the rotation of water, sets up strong …
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Computational Investigation of Ethanol and Bifuel Feasibility in Solstice Engine
… rate. In order to further harness the effects of direct injection, ethanol is implemented as a fuel. The cooling effect of ethanol fuel droplets changing to vapor inside the combustion chamber facilitates a higher compression ratio, thus increasing engine power and efficiency. Three …
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Flexible floating thin film photovoltaic (PV) array concept for marine and lacustrine environments
… a notable improvement was measured due to the cooling effect, slight decrease in performance was also estimated due to water absorption (of ~ 1.4%) within the panels. Overall results from both economic and technical analysis show the feasibility of the concept and that it is a possibility for …
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Computational Design of Microvascular Biomimetic Materials
… formulation is used to take into account the cooling effect of the fluid, instead of solving the conjugate heat transfer problem for obtaining the temperature field in both solid and fluid domains. The Generalized Finite Element Method (GFEM) is adopted because accurate finite element …
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Modelling the M-Effect in H.R.C. Fuses
… capacity fuse using notched strip elements and M-effect alloy, is governed by the inter-relationship between the element current distribution, the corresponding element temperature distribution, and the M-effect diffusion rate. This thesis describes a novel method which has been developed to model …
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Knock limits in spark ignited direct injected engines using gasoline/ethanol blends
… (PFI) by utilizing the in-cylinder charge cooling effect due to fuel evaporation. The use of gasoline/ethanol blends in DI is therefore especially advantageous due to the high heat of vaporization of ethanol. Additionally ethanol blends also display superior chemical resistance to …
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Regional flow conditions associated with stratocumulus cloud-clearing events over the southeast Atlantic
… marine stratocumulus clouds exert a strong cooling effect on the planet, any phenomenon that acts to erode large areas of low clouds may be climatically important. Previous satellite-based research has suggested that the cloud-clearing events may be caused by westward-propagating atmospheric …
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Potential of controlling subcooling in residential air conditioning system
… (RAC) system performance by controlling subcooling. Instead of conventional superheat control at evaporator outlet, condenser subcooling is monitored and controlled and the corresponding effects on vapor-compression system performance as well as the sensitivity of subcooling control to …
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