Thesis (Ph. D.)--Ohio State University, 2004. / Title from first page of PDF file. Document formatted into pages; contains x, 135 p.; also includes graphics. Includes bibliographical references (p. 131-135).

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Architecture, 1987. / Includes bibliographical references (leaves 147-150). / The development of the integrated circuit which replaced the vacuum tube, started the size reduction process for computer components. These integrated circuits are made from silicon (chips) and are comprised of electronic switches, or gates. The gates are measured in size of microns. The diameter of a human hair is approximately 60 microns across. Facilities that develop, and manufacture these integrated circuits require the strictest guidelines for environmental controls and prevention of potential health hazards that personnel may encounter while working in these facilities. The major environmental controls are particle size and number, temperature, relative humidity, air flow velocity, and pressure. Providing this and other forms of control are used to develop what are called cleanrooms. Cleanrooms are used for the manufacture of a number of different kinds of products. The focus of this research will be on the microelectronics industry. This industry leads all other industries in developing systems, standards, and monitoring technologies, to control microcontamination which is the essence of what a cleanroom does. This thesis will be divided into two parts. The first part defines what a cleanroom is and what it is comprised of. Next, there will be methods presented to design this type of space in a more energy and cost efficient manner. The second part involves the research in the vertical laminar flow aspect of operating a cleanroom. The vertical laminar flow offers a structured method for controlling air flow and provides an effective means for discharging particulates out of the cleanroom. By comparison, the conventional air flow system throws the particulates in a random fashion. The vertical laminar flow has its limitations. By itself, the vertical flow operates well, but people, and equipment cause turbulence which disrupts its effectiveness. Working with these variables through research, an alternate method of working with this vertical laminar flow was developed. The results, recorded by photographs show an alternative for dealing with the turbulence and eddys caused by the operations in the cleanroom. There will be a discussion followed by a number of questions, and responses which will be the basis for this research on vertical laminar flow. / by Douglas H. Erickson. / M.S.

Thesis (M.S.)--West Virginia University, 2006. / Title from document title page. Document formatted into pages; contains xii, 100 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 87-91).

Aerosol particle deposition rates on surfaces inside a clean room are predicted by a model developed to account for particle convection, diffusion and sedimentation. External forces acting on the particle also influence the rate of deposition. Both electrical charge build up on product surfaces and temperature gradients in the air near the product surface are known to effect the rate of deposition. A description of an electrostatic and thermophoretic force on the particle is thus included in the model. The equations governing the particle deposition process and the approach used in obtaining a solution to these equations are both described. A finite element numerical solution is detailed, followed by a description of the electrostatic force models. Finally, predictions of the model are presented with a comparison to data experimentally obtained by other researchers.

This thesis studies the following four topics by CFD simulation. First, the detailed airflow patterns and pressure characteristics of a semiconductor fab were analyzed and verified by available experimental data. Second, both transient and steady state simulations of a fire incidence were conducted to study the influences of fire source volume, fire source altitude, and clean room filter face velocity on the temperature distribution around the vicinity of fire source. Note the temperature distribution at the altitude of fire distinguisher (close to the height of ceiling) is very related to the action mechanism of fire distinguisher. Third, the mean trajectories of various particle sizes in the very early stage of a fire occurrence were simulated to provide substantial information to properly locate the VESADs (very early smoke detect active). Fourth, the performances of three commonly adopted smoke control/exhaust systems for semiconductor fabs were evaluated. An appropriate smoke control/exhaust system is provided and discussed.

Made available in DSpace on 2014-10-09T12:27:28Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:06:48Z (GMT). No. of bitstreams: 0 / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

Made available in DSpace on 2014-10-09T12:27:28Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:06:48Z (GMT). No. of bitstreams: 0 / Para que sejam atendidos os requisitos normativos e reguladores dentro dos padrões nacionais e internacionais que tratam das condições inerentes à produção-processamento de materiais sensíveis à contaminação, tais como medicamentos injetáveis, um ambiente com atmosfera controlada deve ser criado. Tratando-se de materiais que têm aplicação medicinal, através de procedimentos específicos, mas que também apresentam em suas constituições agentes tóxicos, radioativos e periculosos, o ambiente deve assegurar que estes materiais, que em alguns casos possuem ainda característica de serem voláteis, não escapem para meio ambiente, sem que isto ocorra de uma maneira seletiva e segura, totalmente controlada. A condição de trabalho neste caso, recomendada pelas normas nacionais e internacionais vigentes, refere-se a uma atmosfera negativa em relação aos ambientes adjacentes. Apesar de a literatura estar amplamente provida de tecnologias referentes ao dimensionamento de sistemas, baseados em normas que determinam claramente os requisitos necessários, verifica-se a necessidade de desenvolver um ambiente controlado para produção de radiofármacos, compatibilizando o conceito de área limpa aos requisitos de segurança para manipulação de fontes radioativas abertas. Neste trabalho, dispositivos foram criados, métodos e procedimentos estabelecidos, com objetivo de possibilitar classificações diferentes do ar no interior da cela, sem barreiras físicas na área de trabalho, estabelecendo uma condição ergonômica, flexível e prática, refletindo em maior produtividade. O projeto resultou na criação de um ambiente totalmente favorável ao pronto atendimento dos requisitos normativos, composto de uma câmara de passagem responsável pela entrada e saída de material, sem que condições internas ao micro-ambiente fossem comprometidas. A estanqueidade da cela foi obtida utilizando-se portas dotadas de sistema eficiente de vedação através de juntas ativas e intertravamentos. Manipuladores tipo pinça asseguraram as operações de maneira ergonômica e segura, sem comprometer a estanqueidade e classificação do ambiente com graus de limpeza A e B. Para isso, utilizou-se um eficiente sistema de ventilação/ exaustão, dotado de filtros e dispositivos especiais desenvolvidos com exclusividade para que as condições impostas ao micro ambiente fossem estabelecidas a contento. Todos os parâmetros de funcionamento da cela foram avaliados através do planejamento de ensaios específicos. Os resultados dos ensaios demonstraram o atendimento aos critérios estabelecidos, indicando o potencial do projeto para o desenvolvimento de uma cela de produção de radiofármacos. / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

The diploma thesis conversant problem of ventilation clean rooms of microbiological laboratory. Clean rooms pose enhanced requirements on quality distributed air, air filtrating, noisiness, humidity, stream velocity, temperature and quarantee requirement overpressures. Practical part is attention paid to solvent project solution airconditioning clean rooms of microbiological laboratory, completion need of calculations and dispose scheme of air conditioning

The diploma thesis is focused on the design of air-conditioning systems for two operating theatres and their auxiliary facilities. An introduction to ventilation of clean rooms and other indoor environments with special requirements on environmental conditions and air cleanliness is given at the beginning of the thesis. The thesis contains calculations and proposed design solution of the air-conditioning systems. The calculations include determination of the air flow rates of air supplied into the ventilated spaces, heating and cooling loads of the operation theatres, the psychometric calculations for summer and winter operational conditions and sizing of equipment, piping and ductworks. The design part also includes air distribution elements, pipeline and ductwork routing and packaged air-handling units. The complete drawing documentation is also included in the thesis.

The subject of my diploma thesis is the processing of project documentation of the construction part for the realization of the new build private health centre Proficlinic in the outskirts of České Budějovice. It is a two-storey partially basement building. On the first floor there is a pharmacy with the preparation of cytostatics, surgery x-ray and facilities for staff. On the underground floor there are technical facilities for new buildings and storage facilities. On the second floor there are individual surgeries and day care center of oncology. The ceilings are made of prestressed panels. The roof of the building is flat single-skinned.