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.
Results
Showing 1 to 20 of 90 for “"Heat Removal"”.
-
Heat removal system for fission converter tank
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.
-
Experimental investigation of optimal heat removal from a surface
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1989.
-
Design of passive decay heat removal system for the lead cooled flexible conversion ratio fast reactor
… difficulties for the design of a passive decay heat removal system. In order to achieve passive cooling, enhancements are needed over current designs, such as the S-PRISM and ABR, which utilize passive cooling through the reactor vessel to atmospheric air. Enhancements such as axial fins, a …
-
Methods for comparative assessment of active and passive safety systems with respect to reliability, uncertainty, economy, and flexibility
… and low driving force for purposes of heat removal phenomena. These characteristics of passive systems can result in increasing system unreliability and may raise potential remedial costs during a system's lifetime. This study presents a comprehensive comparison of reliability and cost …
-
The flow structure under mixed convection in a uniformly heated vertical pipe
For decay heat removal systems in the conceptual Gas-cooled Fast Reactor (GFR) currently under development, passive emergency cooling using natural circulation of a gas at an elevated pressure is being considered. Since GFR cores have high power density and low thermal inertia, relative to the high …
-
Maintenance practices for emergency diesel generator engines onboard United States Navy Los Angeles class nuclear submarines
… generators. In addition to the need for decay heat removal common to all (naval and commercial) nuclear reactors, naval vessels with nuclear reactors also require a backup means of propulsion. All underway Navy nuclear reactors are operated with diesel generators as a backup power system, able …
-
Developing a low-cost, systematic approach to increase an existing data center's Energy Efficiency
… the energy efficiency of data centers' heat removal and lighting equipment. The result of implementing the low-cost systematic approach, consisting of both technical and behavior modifications, was a 23% reduction in electricity consumption, leading to annual savings of over $53,000. The …
-
Novel Methods of Thermal Management in High‐Performance Induction Motors Using Direct Stator Winding Cooling
… to current electric drives retrofit with a novel heat removal system to enhance the reliability. The heat removal system is comprised of a collection of channels strategically placed within the stator slots, where liquid coolant can be forced through to extract unwanted heat that imposes thermal …
-
Evaluation of nuclear spent fuel dry storage casks and storage facility designs
… dissertation provides an overview of cask types, heat transfer, radiation shielding and storage facility types. Specific criteria are required in the selection of casks and the storage facility to house the casks on site. The selection criteria for casks and the storage facility were determined …
-
Experimental Evaluation of an Additively Manufactured Straight Mini-Channel Heat Sink for Electronics Cooling
… led to a significant growth in the density of heat dissipation within these devices. This increase in heat generation has challenged conventional air fan cooling and alternative solutions for heat removal are required to avoid overheating and part damage. Micro/Mini channel heat sinks (M/MCHS) …
-
Validation Studies of Single-Phase Natural Circulation Response of the Fluoride salt-cooled High-temperature Reactor (FHR)
… that are of interest in designing the decay heat removal system for a Fluoride salt-cooled High-temperature Reactor (FHR). The loop of interest operates with a single phase, near ambient pressure molten salt coolant. Most of the codes used for LWR safety and licensing were designed to model …
-
The impact of passive safety systems on desirability of advanced light water reactors
… by the vendors. Considering a simplified decay heat removal system that utilizes an isolation condenser for decay heat removal, the uncertainty in the main parameters affecting the system performance upon a reactor isolation accident is characterized when the system is to rely on natural …
-
The design of an intense accelerator-based epithermal neutron beam prototype for BNCT using near-threshold reactions
… head phantom dosimetry, and accelerator target heat removal. First, a method was developed to accurately calculate thick target neutron yields for both near-threshold and higher energy proton beams, in lithium metal as well as lithium compounds. After these yields were experimentally verified, …
-
Reliability analysis of a passive cooling system using a response surface with an application to the Flexible Conversion Ratio Reactor
… and as an example two design options for a decay heat removal system are assessed and quantitatively compared. Next, the reliability of the system is assessed by quantifying the uncertainties related to system performance and propagating these uncertainties through a response surface using Monte …
-
Heat transfer during spray water cooling using steady experiments
… used in many industrial processes to control heat removal from a hot material surface. In order to control heat transfer rates and obtain desired surface temperature distributions, a deeper understanding of fundamental spray cooling dynamics and more accurate estimation of spray heat transfer …
-
Development and assessment of a physics-based model for subcooled flow boiling with application to CFD
Boiling is an extremely efficient mode of heat transfer and is the preferred heat removal mechanism in power systems in general and, more recently, in electronics cooling. Physics-based models that describe boiling heat transfer, when coupled with Computational Fluid Dynamics (CFD), can be an …
-
Micro Channel Cooler Performance Improvement by Insonation
… for this work is the need to remove waste heat from laser diodes and high speed transistors in processes which are exponentially increasing past 1 kW/cm2 as anticipated by Moore's Law. The hypothesis guiding the work is that ultrasonic insonation of micro coolers employed to dissipate these …
-
Heat Transfer and Hydrodynamics of Miscible/Immiscible Systems in Microchannel Devices
… It is expected that in the near future, the heat flux dissipated from integrated circuits and other electronic devices increase significantly. Hence, efficient solutions need to be proposed to prevent the abovementioned problems and provide efficient cooling. Regarding the geometrical design …
-
Advancement of closure relations for annular flow modeling in CFD
… presence of a liquid film in contact with the heated rod surface is crucial to ensure an efficient heat removal and prevent the threatening occurrence of dryout. The accurate prediction of the complex multidimensional liquid film behavior in advanced BWR fuel assemblies is critical to guarantee …
Page 1 of 5