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京都大学 / 新制・課程博士 / 博士(理学) / 甲第23712号 / 理博第4802号 / 新制||理||1687(附属図書館) / 京都大学大学院理学研究科地球惑星科学専攻 / (主査)教授 竹見 哲也, 准教授 重 尚一, 教授 榎本 剛 / 学位規則第4条第1項該当 / Doctor of Science / Kyoto University / DGAM

Simhallar har en hög fuktbelastning från insidan som är krävande för ytterväggar och tak. Utöverdet varma och fuktiga klimatet har simhallar ofta en hög takhöjd, som i kombination med denhöga lufttemperaturen skapar ett termiskt tryck mot simhallens innertak. Via konvektion riskerarvarm och fuktig luft att strömma ut genom otätheter i takkonstruktionen till kallare delar i taketmed kondensbildning som följd.Konvektion genom taket kan hindras genom att trycksätta ett utrymme innanför simhallens takmed ett högre tryck än det högsta termiska trycket i simhallen. Syftet är att undersöka ur ettfukttekniskt perspektiv hur det trycksatta utrymmet ska utföras för att vara fuktsäkert.Rapporten omfattar en redogörelse för hur klimatet i simhallar har förändrats genom åren ochvilka skademekanismer som påverkar takkonstruktionen. Teoretiska fuktberäkningar görs iprogrammet Wufi 5 på en takkonstruktion i limträ som både utförs med och utan ett trycksattutrymme innanför taket i simhallen.Resultaten visar på att en takkonstruktion med ett trycksatt utrymme är en fukttekniskt säkrarelösning. Det totala vatteninnehållet i konstruktionen minskar över tid, vilket tyder på attbyggfukt torkas ut och att fukt från simhallen inte läcker ut i det trycksatta utrymmet. / Buildings with indoor swimming pools are exposed to high humidity from the inside which isstressful on the exterior walls and the roof. In addition to the warm and humid climate insidepublic baths they also often have a high ceiling height, that in combination with the high airtemperature creates a thermal pressure against the ceiling. By way of convection the warm andhumid air will escape through the ceiling construction if it is not airtight and the humid air willcondense when it reaches the colder layers.To prevent convection to occur, a pressurized space with a higher pressure than what the ceilingis exposed to in the swimming pool area can be placed above the ceiling of the public bath. Thepurpose of this study is to examine how the pressurized space can be executed to be moistureproof.This study includes a report of how the climate in indoor swimming pools have changed throughthe years, and how damage due to moisture affects the roof construction. Theoreticalcalculations are implemented on a roof construction made of glued laminated timber, calculatedboth with and without the pressurized space.The results point to that a roof construction with a pressurized space above the ceiling of theswimming pool area is a more moisture-proof solution. The total content of water in theconstruction reduces over time, which means that the construction gets dryer and no moist fromthe swimming pool area makes its way into the pressurized space.

<p> The progress of technology in the electronic components industry has been rapidly growing. The evolution of various techniques has made it possible for this industry to grow and diversify with the market demand. Thus, the development of electronic component products over a short span of time requires having highly efficient tools for design and manufacturing. Advances in commercial Computational Fluid Dynamics (CFD) softwares and computational power have enabled modeling to a high level of architectural details. Nowadays, computer aided design becomes an essential design tool in the engineering environment. Computer analysis reduces both the time development cycle and the prototyping costs in the early to intermediate design phases. The accuracy of the computational prediction of heat transfer rates depends mostly on the correct choice of turbulent model. Although many turbulent models, rather than a universal turbulent model, have been developed during the last two decades, there is usually one model that performs better than others for certain flow conditions. </p> <p> In the present research, a turbulence model is selected from amongst a few candidates, namely standard k- 8, RNG k- 8, shear stress transport (SST), and Reynolds Stress Model (RSM), based on comparisons with experimental data and direct numerical simulation (DNS) results from previous work. The SST turbulence model shows excellent agreement with the DNS results and, hence, is considered an appropriate turbulence model for thermal analysis of electronic packages with elements that have almost the same heights. Moreover, the average Nusselt number of array of obstacles is obtained numerically using commercial code ANSYS-CFX 1 0.0. The effects upon the mean Nusselt number arising from parameteric changes in Reynolds number, element height, element width, and element-to-element distance are compared and discussed. Finally, the parametric study has offered a set of correlations for the mean Nusselt number of arrays of mounted obstacles in the channel flow. </p> / Thesis / Master of Applied Science (MASc)

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1981. / Microfiche copy available in Archives and Science. / Bibliography: leaves 200-215. / by Claude Jaupart. / Ph.D.

Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1981. / Microfiche copy available in Archives and Science. / Vita. / Bibliography: p. 235-247. / by Earle Rolfe Williams. / Ph.D.