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 44 for “"Active Cooling"”.
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Design and analysis of the ICRF antenna with active cooling
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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Active cooling for electronics in a wireline oil-exploration tool
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Effectiveness of active cooling on torque performance for prosthestic applications
… to the motor. The addition of a fan-based active cooling system allowed the motor to run at 142% of its maximum continuous current rating for up to 56 seconds before winding temperatures exceeded 550 C, and limited temperature increase in simulation to 26' above ambient temperature when the …
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Evaluation of core temperature measurement and treatment of capture-related hyperthermia in anesthetized brown bears (Ursus arctos)
… decrease in core body temperature produced by an active cooling protocol and by alpha-2 antagonism. Thirty-one brown bears were captured with a combination of zolazepam-tiletamine and xylazine or medetomidine. One VS capsule was inserted deep into the animals’ rectum and another into the stomach. …
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Thermal regulation of vascularized fiber-reinforced polymer matrix composites
… explores two methods for thermal regulation: active cooling and transpirational autonomic cooling. During active cooling, a fluid is pumped through the vascular network to transfer heat from the solid to the fluid and out of the PMC. This method requires external powering of the pumping and a …
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Development of a meso-scale liquid-fueled burner for electricity generation through the use of thermoelectric modules
… resulted in higher metal temperatures. Without cooling the cold side of the thermoelectric modules, performance increased while the system was heating up, but then dropped after reaching a peak. Cold side cooling improved thermoelectric performance by increasing its temperature difference. …
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Developing an active, high-heat-flux thermal management strategy for power electronics via jumping-droplet phase-change cooling
… This work presents the first demonstration of active cooling for hot spots in compact electronics via electric-field-enhanced (EFE) jumping-droplet condensation. To test the viability of EFE condensation for electronic hot spot cooling, an experimental setup was developed to remove heat via …
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Cognitive function during exertional heat stress assessed using traditional and serious game technology
… temperature of 38.5°C and restored following an active cooling recovery protocol. However, when decision making was evaluated using the serious game scenario, task specific performance deficits were not seen during treadmill walking but impairment in memory recall was found following the active …
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Design of Extreme Efficiency Active Rectifier for More-electric Aircrafts
… temperature could be as high as 70 ºC. Moreover, active cooling for converters may not be desirable. To deal with this, rectifiers should achieve extreme efficiency (especially at full load) so that all the components are not overheated without active cooling. This work aims at achieving extreme …
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An analysis of annual environmental conditions and heat gains, and theoretical assessment of approaches to improve summer thermal comfort, of the Energy Research Centre at the University of Cape Town
… While a simple solution would be to install an active cooling system, first consideration should be given to the deployment of preventative cooling measures and retrofits. By these means, the costs of an active cooling system would be reduced, as well as the building's relative increase in …
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Forced Convection in Microchannels with Nanostructures on One Wall
… a result, need to dissipate higher heat fluxes. Active cooling is the only possible method of thermal management for these devices. A new type of microchannel heat sink has been developed and evaluated in this study. The device consists of silicon microchannels on whose bottom surfaces …
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A High Temperature Wideband Power Amplifier for a Downhole Communication System
… to an ambient temperature of 230oC using passive cooling opposed to active cooling. At 230 C it operates in class A with a peak PAE of 25.03%, maximum output power of 1.66 W, peak gain of 24.5 dB, center frequency of 255 MHz with 1dB ripple in the passband over a 60 MHz bandwidth, 1dB output …
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THERMAL MANAGEMENT OF ROTATING DETONATION ENGINES
… by means of a methodical approach to designing a cooling system. The research methods include experimental measurements, low-order analysis, and finite element analysis. A preliminary thermal assessment is performed on the existing RDE to verify the need for cooling. Data obtained from this …
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Theoretical Analysis of Transpiration Cooling of a Liquid Rocket Thrust Chamber Wall
<p>Transpiration cooling is a process that could reduce the overall weight of the cooling system of an actively cooled thrust chamber wall of a liquid rocket engine by up to 50% when compared to other active cooling techniques, increasing the thrust to weight ratio of the rocket engine. In this …
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Heat Transfer Coefficient and Adiabatic Effectiveness Measurements for an Internal Turbine Vane Cooling Feature
… temperature of key turbine components. Without active cooling schemes, modern turbines would fail catastrophically. This study will evaluate a novel cooling scheme for turbine airfoils, called microcircuit cooling, in which small cooling channels are located extremely close to the surface of a …
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Thermal-fluid modeling of the Missouri S&T reactor
… of an eductor outlet from, and inlet into the active cooling system to predict heat removal capability. The major contribution of this study is to explain the thermal flow in the MSTR channels and pool, and to provide a framework for supporting reactor license renewal, and power uprate …
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MASS BALANCE: Design strategies for lightweight, thermally massive construction systems
… thermal mass performance by 6.5% and their active cooling capacity by 14.5%. Moreover, the implementation of multi-optimization techniques allows for the exploration of Pareto-optimal designs that, at the expense of lowering the material savings achievements to 38%, can further improve their …
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Implementation and evaluation of thermal avoidance strategies in arid, cost-constrained climates aimed at improving indoor thermal comfort : a case study in Bhuj, India
… and climates, as well as concurrently with active cooling systems to reduce energy consumption or extend existing capacity. Further work will seek to improve the design and adaptability of the system to different regions.
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Friction stir welding simulation, optimization and design
… the second theme, discontinuous and distributed cooling methods, which use periodical and non-uniformly distributed cooling medium flow to cool the welding workpieces, are proposed to reduce the residual stress of friction stir welds and investigated using multi-physics numerical simulation to …
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Aerospike Rocket Motor Structural Webbing
… rig has been the development of regenerative cooling techniques using nitrous oxide as coolant and oxidizer, as well as validation of technologies relating to the annular aerospike nozzle. In order to prevent undesirable deflection of the cantilevered spike, a structural stiffening web, …
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