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Dissertations / Theses on the topic 'Ventilation'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

Ramsay, Michelle Clare. "Patient-ventilator interaction in domiciliary non-invasive ventilation." Thesis, King's College London (University of London), 2018. https://kclpure.kcl.ac.uk/portal/en/theses/patientventilator-interaction-in-domiciliary-noninvasive-ventilation(9b60bd3e-84b6-4605-96a8-22b4546b1e90).html.

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Introduction: Patient-ventilator asynchrony (PVA) can adversely affect the initiation of home mechanical ventilation (HMV). The aim was to quantify the prevalence of PVA during HMV and determine the relationships between PVA and adherence to therapy, respiratory muscle loading, nocturnal gas exchange, health-related quality of life measures and sleep quality. Method: A pilot randomised control trial was conducted to compare a physiological led set-up of HMV, using neural respiratory drive to optimise ventilator set-up, to an expert led set-up. Type and frequency of PVA were measured by surface
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2

Sperber, Jesper. "Protective Mechanical Ventilation in Inflammatory and Ventilator-Associated Pneumonia Models." Doctoral thesis, Uppsala universitet, Infektionssjukdomar, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-282602.

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Severe infections, trauma or major surgery can each cause a state of systemic inflammation. These causes for systemic inflammation often coexist and complicate each other. Mechanical ventilation is commonly used during major surgical procedures and when respiratory functions are failing in the intensive care setting. Although necessary, the use of mechanical ventilation can cause injury to the lungs and other organs especially under states of systemic inflammation. Moreover, a course of mechanical ventilator therapy can be complicated by ventilator-associated pneumonia, a factor greatly influe
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3

Carteaux, Guillaume. "Optimisation des interactions patient-ventilateur en ventilation assistée : intérêt des nouveaux algorithmes de ventilation." Thesis, Paris Est, 2015. http://www.theses.fr/2015PESC0027/document.

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En ventilation assistée, les interactions patient-ventilateur, qui sont associés au pronostic, dépendent pour partie des algorithmes de ventilation. Objectifs : Caractériser l'intérêt potentiel des nouveaux algorithmes de ventilation dans l'optimisation des interactions patient-ventilateur : 1) en ventilation invasive, deux modes et leurs algorithmes nous ont semblé novateurs et nous avons cherché à personnaliser l'assistance du ventilateur en fonction de l'effort respiratoire du patient au cours de ces modes proportionnels : ventilation assistée proportionnelle (PAV+) et ventilation assistée
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4

Fjellborg, Anders. "Energieffektiv ventilation." Thesis, Linköpings universitet, Energisystem, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-76910.

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Syftet med detta examensarbete är att konkretisera och visa på de grundläggande problemen med inomhusklimatet i Brogårdsfabriken i Vetlanda, för att utifrån detta komma fram med åtgärdsförslag för att minska dem. Detta samt att utreda möjligheterna att ta till vara den i fabriken internt genererade överskottsvärmen och minska energianvändningen. Arbetet har skett i ett top-down-perspektiv, vilket betyder att fabriken ses som ett slutet system där tillförd energi in i systemet ställs mot bortförd energi ut ur systemet. Stor del av arbetet har bedrivits i simuleringsprogrammet IDA – Indoor Clima
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Bengtsson, Patrik, and Joel Blomfelt. "Variabel Ventilation." Thesis, KTH, Energiteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-190163.

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A lot of people today spend most of their lives indoors. Both at home and at work time is spent in areas where the climate is not governed by the weather but by ventilation systems meant to create a suitable indoor climate. Despite having such a central part in society the subject of ventilation seldom gets very much attention, and in the current situation it is not a foregone conclusion that indoor air quality and climate is satisfactory. Those who build the homes and premises normally explain this as a result of cost considerations, but essentially the situation originates from other issues.
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6

Hammash, Muna Hassan. "CARDIAC RHYTHM DURING MECHANICAL VENTILATION AND WEANING FROM VENTILATION." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_diss/56.

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The transition from mechanical ventilation (MV) to spontaneous ventilation during weaning is associated with hemodynamic alterations and autonomic nervous system (ANS) alterations (reflected by heart rate variability [HRV]). Although cardiac dysrhythmias are an important manifestation of hemodynamic alterations, development of dysrhythmias during MV and weaning and subsequent impact on length of MV has received little attention. The purposes of this dissertation were to 1) evaluate the relationship of heart rate variability (HRV) during weaning to the development of cardiac dysrhythmias and 2)
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7

Jerräng, Carlstedt Ludwig. "A comparison between emergency ventilation systems semi-transvers ventilation and natural ventilation in Road Tunnel A." Thesis, Luleå tekniska universitet, Byggkonstruktion och brand, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65671.

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8

Rashid, Dewan Md Harunur Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "Wake survey behind a rotating ventilator." Awarded by:University of New South Wales. School of Mechanical and Manufacturing Engineering, 2002. http://handle.unsw.edu.au/1959.4/19076.

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With environmental concern growing in both affluent and developing countries, roof top ventilators, a form of natural ventilation requiring only wind energy to ensure quality air circulation and comfort is becoming a considered choice of many households and industries. Unfortunately, however, many of these ventilators have evolved through trial and error and the flow physics associated with these ventilators is barely understood. The present experimental project was, therefore, undertaken as part of UNSW- Industry collaboration program funded under an Australian Research Council Grant to explo
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9

Todd, Susan Katharine. "Shock assisted ventilation." Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/843314/.

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Respiratory distress syndrome is the major cause of mortality in premature babies. Increasing numbers of neonates are now surviving the disease due to advances in techniques used in neonatal intensive care units. Mechanical ventilation is an essential part of the treatment for respiratory distress syndrome and is an area in which improvements and modifications are constantly being made. In the early 1980's a new infant ventilator was introduced involving ventilation by a distal jet. As yet, the mechanisms by which the distal jet ventilator enhances gas exchange are unknown. Original experiment
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10

CHAIPRASIT, KRIRKPHAN. "Designing for Ventilation." The University of Arizona, 1989. http://hdl.handle.net/10150/555319.

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11

Bergman, Eric, and Emma Gahne. "Ventilation av inomhusskjutbanor." Thesis, KTH, Byggteknik och design, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-257747.

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Skytte med eldhandvapen skapar buller, utsläpp av farliga ämnen och risk för att avlossade projektiler missar sina mål och istället hamnar utanför skjutbanan. Att förlägga skjutbanor inomhus löser vissa av dessa problem. Samtidigt kan risken för att utsättas för farliga ämnen öka för dem som brukar skjutbanan. En nyckelfaktor för att omhänderta dessa farliga ämnen och därmed skapa en god arbetsmiljö på inomhusskjutbanan är att ventilationen fungerar på rätt sätt. Syftet med detta arbete är främst att utvärdera hur ventilationen på inomhusskjutbanor bör utformas för att ventilera bort de hälsof
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12

Benscoter, Dan T. "Ventilation Reconciliation: Improving the Accuracy of Documented Home Ventilator Settings in a Pediatric Home Ventilator Clinic." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin155421301584871.

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13

Pálsson, Daði Snær. "Hybrid Ventilation : Simulation of Natural Airflow in a Hybrid Ventilation System." Thesis, KTH, Installations- och energisystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-146761.

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This thesis investigates the possibilities of using hybrid ventilation in an office building in Stockholm. The focus is on simulating the natural airflow to find out for which conditions it is sufficient. The thesis is done at White Arkitekter AB in cooperation and under the supervision of environmental specialists working there. A literature study is carried out to study what has been done before in Sweden as well as in other countries. Computer simulations are used to simulate the airflow to examine the conditions and architecture. A synthetic computer model representing a realistic office b
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14

Lofaso, Frédéric. "Effet de la ventilation mécanique sur le contrôle de la ventilation." Paris 12, 1996. http://www.theses.fr/1996PA120064.

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Jusqu'a ces dernieres annees les modifications de l'activite respiratoire au cours de la ventilation mecanique avaient ete peu explorees chez l'homme. Nous avons donc etudie les mecanismes physiologiques qui expliquent une diminution de l'activite inspiratoire et une modification de l'activite expiratoire sous ventilation mecanique. En effectuant une augmentation progressive du co#2 inspire sous ventilation mecanique, nous avons pu mettre en evidence l'existence d'une inhibition extra-humorale (non liee a la capnie) de l'activite inspiratoire. En montrant qu'au cours de la ventilation mecaniqu
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15

Nöjd, Mathilda, and Emma Petersson. "Parallelltak med mekanisk ventilation : En jämförelse mellan mekanisk och naturlig ventilation." Thesis, Uppsala universitet, Institutionen för samhällsbyggnad och industriell teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-415713.

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To build and conserve the moisture proof roof constructions is a central problem in the building industry. Outdoor ventilated roof constructions is considered to be a riskful construction that can be burdened with moist damages. It is problematic to build parallel roof with low energy consumption that are resistant to moist. New demands of energy efficient buildings has contributed to an increased amount of insulation in roof constructions. Well insulated roof constructions in combinations with moist and cold winters is the main cause to the current moisture problematic in Sweden. High relativ
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16

Walsh, Brian Kendall. "Computer-aided mechanical ventilation." Thesis, Rush University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10111109.

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<p> <b>Statement of the problem:</b> The systematic implementation of evidence-based practice through the use of guidelines, checklists and protocols has been shown to mitigate the risks associated with MV, yet variation in practice remains prevalent. Recent advances in MV, physiologic monitoring, device-to-device communication, computer processing and software engineering have allowed for the development of an automated point-of-care access to real-time goal setting and practice variance identification. Our aim was to assess the utility of a computer-aided MV (CAMV) system that displays varia
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17

Patel, Deena. "Optimisation of neonatal ventilation." Thesis, King's College London (University of London), 2014. https://kclpure.kcl.ac.uk/portal/en/theses/optimisation-of-neonatal-ventilation(020793ce-af66-48de-b969-bc0d702a673f).html.

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Background: Infants born prematurely or at term may unfortunately suffer morbidity from ventilator related complications. New ventilation techniques have been developed aimed at reducing that morbidity, but have yet to be fully evaluated. Aim: To optimise the delivery of new techniques using physiological outcome measures. Methods: A series of studies were undertaken. The objectives were: • In prematurely born infants with acute respiratory distress, to determine the optimal level of volume targeted ventilation. • In term and prematurely born infants, to assess the effect on work of breathing
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18

Shetty, Sandeep Krishnanand. "Optimisation of neonatal ventilation." Thesis, King's College London (University of London), 2018. https://kclpure.kcl.ac.uk/portal/en/theses/optimisation-of-neonatal-ventilation(4bf50e9a-9ef5-41f9-baff-db581cf231d2).html.

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Background: Survival of neonates requiring respiratory support has improved over the last two decades, but unfortunately many suffer morbidity from ventilator related complications. Aim: To undertake a series of studies using physiological measurements as outcomes in infants with evolving or established bronchopulmonary dysplasia (BPD) to test the following hypotheses and carry out a national survey. Hypotheses: Proportional assist ventilation (PAV) compared to assist control ventilation (ACV) would improve oxygenation as assessed by the oxygenation index (OI). Neurally adjusted ventilatory as
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Howe, Kimberly Palazzo. "Mechanical Ventilation Antioxidant Trial." Case Western Reserve University School of Graduate Studies / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=case1112877564.

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Chowdhury, Olie. "Optimisation of neonatal ventilation." Thesis, King's College London (University of London), 2015. http://kclpure.kcl.ac.uk/portal/en/theses/optimisation-of-neonatal-ventilation(eac22c4d-b74f-4e29-8a7f-995a5c17c8a9).html.

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Background: Survival of neonates requiring intensive care has improved, but many suffer ventilator-related complications. This thesis aims to optimise use of ventilation techniques, with a focus on infants born at term. Hypotheses: In infants with acute respiratory failure, volume-targeted ventilation (VTV) will be superior to pressure-limited ventilation (PLV). Proportional assist ventilation (PAV) will be effective in reducing elastic and resistive work of breathing (WOB) in an in vitro experiment. Methods: A series of studies were undertaken. National survey of practice in relation to respi
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Mallya, Prashant Moodabidri. "Pressure support ventilation or synchronised intermittent mandatory ventilation for weaning premature babies on mechanical ventilation : a multi centre randomised controlled trial." Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3820.

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Mechanical ventilation is life saving as a respiratory support for preterm infants with respiratory distress syndrome. There is good evidence now that any form of volume-targeted modality of mechanical ventilation is superior over pressure-targeted modality to reduce chronic lung disease and death. It is perceived by minimising the duration of mechanical ventilation would reduce the exposure to positive pressure breaths and thereby could reduce long term morbidities such as chronic lung disease. An area of lacunae is defining what is weaning on mechanical ventilation. Whilst most clinicians wi
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Balaji, Ravishankar. "Breathing Entrainment and Mechanical Ventilation in Rats." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1307743446.

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Tomasi, Roberta. "Energy performance, comfort and ventilation effectiveness of radiant systems coupled with mechanical ventilation." Doctoral thesis, Università degli studi di Padova, 2012. http://hdl.handle.net/11577/3422467.

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This work presents the results of different numerical and experimental studies about energy performance, thermal comfort and ventilation effectiveness of radiant systems combined with different types of mechanical ventilation. Experimental studies have been carried out in Italy, in a test room in the laboratories of the company RHOSS S.p.A in Codroipo (Udine) and in Denmark, in a test room in the laboratories of the International Centre for Indoor Environment and Energy (ICIEE), at DTU (Danish Technical University), in Lyngby. Radiant systems in residential and in office buildings are increa
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Thille, Arnaud. "Asynchronies patient-ventilateur au cours de la ventilation assistée." Phd thesis, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00667286.

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Des asynchronies patient-ventilateur sont fréquemment observées en ventilation assistée. Objectif : Déterminer l'incidence et les facteurs favorisants des asynchronies, venant du patient, du ventilateur ou des réglages, et préciser le réglage optimal du ventilateur. Méthodes : Nous avons évalué l'incidence des asynchronies avec une méthode simple et non invasive basée sur l'analyse des courbes du ventilateur. Chez les patients qui présentaient des efforts inefficaces, nous avons mesuré l'effort inspiratoire avec une sonde œsophagienne afin d'optimiser le réglage du ventilateur. Nous avons éval
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25

Clark, Craig. "Use of hybrid ventilation techniques for improved energy efficiency of fan systems." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33962.

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The goal of this thesis was to improve the energy efficiency of building ventilation systems by exploring new methods of applying natural ventilation concepts. Strictly natural systems have limitations in which climates they can function or can provide optimal performance; these limitations lead to the use of mechanical or hybrid ventilation. This study looked at methods of combining the operation of the systems, such that the natural components improve the efficiency of the mechanical system.
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Hermand, Eric. "Contrôle ventilatoire à l'exercice et en hypoxie : mise en évidence d'une périodicité constitutionnelle." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCD037/document.

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L’instabilité de la ventilation est un phénomène connu chez l’homme. Elle était jusqu’à présent observée chez l’homme sain en altitude et chez les patients souffrant d’insuffisance cardiaque (IC) et de syndrome d’apnées du sommeil (SAS), d’origine centrale, obstructive ou mixte, le plus souvent pendant le sommeil. Une analyse spectrale rétrospective de tests d’effort en hypoxie a mis à jour une instabilité ventilatoire lorsque le système de contrôle de la ventilation est soumis à une double contrainte, physiologique (exercice modéré) et environnemental (hypoxie simulant une altitude de 2000 à
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Booth, Derrick W. "An evaluation of industrial ventilation troubleshooting methods /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/10105.

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Chowdhury, Patrik. "Aspekter som avgör anestesisjuksköterskans val av peroperativ ventilation vid bukkirurgi, volym eller tryckkontrollerad ventilation?" Thesis, University of Gävle, Ämnesavdelningen för vårdvetenskap, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-4864.

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<p>Bakgrund. Enligt den nya kompetensbeskrivningen för anestesisjuksköterskor framgår bland annat att anestesisjuksköterskan ska ha kompetens att övervaka och följa upp ventilation och cirkulation hos sina patienter. Det har länge varit vanligt att använda volymkontrollerad ventilation (VCV) till patienter som genomgår bukkirurgi. Nu finns det ett annat alternativ, tryckkontrollerad ventilation (PCV). Det är ett omdiskuterat ämne huruvida det mer traditionella VCV eller det senare PCV ska tillämpas på patienter som genomgår bukkirurgi. Syfte. Syftet med denna studie var att beskriva de aspekte
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Sütterlin, Robert. "Jet Ventilation for Airway Surgery : The Influence of Mode and Frequency on Ventilation Efficacy." Doctoral thesis, Uppsala universitet, Anestesiologi och intensivvård, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-229033.

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In surgery for airway obstruction, the anesthetist and the ear-nose-throat surgeon share the approach to the airway and jet ventilation (JV) is a mutually convenient ventilation technique for both parties. As a consequence of the open system jet ventilation is applied in, bedside measurements of lung volumes are cumbersome to perform and thus, there is a lack of studies comparing different modes of JV or investigating the influence of ventilator settings on lung volumes and gas exchange. In this thesis, single frequency jet ventilation and superimposed high frequency jet ventilation (SHFJV) at
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Ronski, Stephanie. "Ventilation der Grönlandsee : Variabilität und ihre Ursachen 1994-2001 = Ventilation on the Greenland Sea /." Bremerhaven : Alfred-Wegener-Institut für Polar- und Meeresforschung, 2003. http://www.gbv.de/dms/bs/toc/364268026.pdf.

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31

Choonya, Gasper. "Experimental investigation of ventilation performance of corner placed stratum ventilation in an office environment." Thesis, Högskolan i Gävle, Energisystem och byggnadsteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-29710.

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Energy use in buildings account for about one third of the total global energy supply and contributes as much as 30% of the anthropogenic greenhouse gas emissions. It is estimated that energy use in buildings will increase to 67% by 2030. The need for better thermal comfort and air quality in indoor environments is the leading cause for high energy use in buildings.  Heating, ventilation and air conditioning systems take up about 50% of the total energy use in buildings which is about 10-20% of the national energy use in most developed countries. The development and adoption of sustainable ven
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Hillblom, Karin. "Ombyggnad av ventilation i kulturbyggnader." Thesis, KTH, Byggvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-46321.

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I detta arbete studeras hur en systemombyggnad i kulturbyggnader kan gå till med avseende på installationerna. I Sverige finns det idag totalt ca 4,7 miljoner byggnader av vilka ca 235 000-280 000 bör genomgå kulturbevarande byggnadsvårdsinsatser. Vid ombyggnad av ventilationen i en kulturbyggnad är det viktigt att man, samtidigt som man får en ändamålsenlig och energisnål lösning, tar hänsyn till byggnadens karaktär och förutsättningar så att den kulturhistoriskt värdefulla miljön bevaras. I detta arbete studeras tre olika kulturhistoriskt värdefulla byggnader som genomgått renovering av vent
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Kenton, Amanda Gail. "Natural ventilation in theatre design." Thesis, University of Cambridge, 2006. https://www.repository.cam.ac.uk/handle/1810/252011.

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Zou, Yue. "Air jets in ventilation applications." Doctoral thesis, Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3146.

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MacKinnon, Ian R. (Ian Roderick) 1964. "Air distribution from ventilation ducts." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59655.

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A wooden, perforated, uniform cross-section duct was examined to determine the optimum levels of aperture ratio and fan speed with respect to uniformity of discharge. The optimum aperture ratio for the 8.54 m long duct was 1.0 with a uniformity coefficient of 90.28%. The fan speed had little effect on the uniformity of discharge. The friction factor was experimentally determined to be 0.048 for a non-perforated duct and this value was assumed to be the same for a perforated duct of similar construction. A kinetic energy correction factor was used to analyze the flow in the duct. Values for thi
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Li, Rong. "Natural ventilation of atrium spaces." Thesis, University of Sheffield, 2007. http://etheses.whiterose.ac.uk/6112/.

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This research is aimed to develop a series of design guidelines and relevant prediction tools for the incorporation of natural ventilation in atrium spaces as a passive cooling strategy. Focused on the geometrical and thermal characteristics of atrium buildings, four issues related to this purpose are investigated in this work including thermal comfort, wind-induced ventilation, buoyancy-induced ventilation and combined buoyancy and wind driven ventilation: In order to identify when passive cooling strategies are needed for atrium spaces, a new thermal comfort assessment method which enables t
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van, Drunen Erwin Johan. "Mechanical Ventilation Modelling and Optimisation." Thesis, University of Canterbury. Mechanical Engineering, 2013. http://hdl.handle.net/10092/8400.

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Acute Respiratory Distress Syndrome (ARDS) is associated with lung inflammation and fluid filling, resulting in a stiffer lung with reduced intrapulmonary gas volume. ARDS patients are admitted to the Intensive Care Unit (ICU) and require Mechanical Ventilation (MV) for breathing support. Positive End Expiratory Pressure (PEEP) is applied to aid recovery by improving gas exchange and maintaining recruited lung volume. However, high PEEP risks further lung injury due to overstretching of healthy lung units, and low PEEP risks further lung injury due to the repetitive opening and closing of lung
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Luo, Zhiwen, and 罗志文. "City ventilation by slope wind." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B46089962.

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Young, Peter Jeffrey. "Pulmonary aspiration in mechanical ventilation." Thesis, University of East Anglia, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323263.

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Pulmonary aspiration in mechanical ventilation occurs despite appropriate inflation of the tracheal tube cuff. After anaesthesiath is can causep ostoperative and, in critically ill patients, ventilator-associated pneumonia. Cuff over-inflation exerts excessive pressure on the tracheal mucosa causing injury. High volume low pressure (HVLP) cuffs permit wall pressure control as the intracuff pressure (CP) is the tracheal wall pressure (TWP). Unfortunately, at the cuff wall, folds and channels and, therefore, fluid leakage occur. Low volume high pressure (LVHP) cuffs develop neither folds nor ass
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Young, John Duncan. "Gas movement during jet ventilation." Thesis, University of Southampton, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358708.

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Kobayashi, Nobukazu 1967. "Floor-supply displacement ventilation system." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8688.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Architecture, 2001.<br>Includes bibliographical references (p. 104-106).<br>Research on indoor environments has received more attention recently because reports of symptoms and other health complaints related to indoor environments have been increasing. Heating, ventilating, and air-conditioning (HVAC) systems are used to control the indoor environment. Therefore, it is necessary to provide a good ventilation system that can provide good indoor environment. To improve indoor air quality, displacement ventilation systems can work we
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Chen, Shaw-Bing. "Natural ventilation generates building form." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/65048.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Architecture, 1996.<br>Includes bibliographical references (leaves 149-151).<br>Natural ventilation is an efficient design strategy for thermal comfort in hot and humid climates. The building forms can generate different pressures and temperatures to induce natural ventilation. This thesis develops a methodology that uses a computational fluid dynamics (CFD) program. The purpose of the CFD program is to assist architects to design optimum building form for natural ventilation. The design of a cottage in Miami, Florida demonstrates
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Kuesters, Andrea Susanne. "A study of ventilation flows." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607801.

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Vad-Schütt, Klockervold Beatrice. "Natural ventilation and behavioural differences." Thesis, KTH, Energiteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-192156.

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To open a window can feel natural when experiencing frowsty air, a high room temperature, or stuffiness. Regardless of the purpose of the natural ventilation, heat is being let out and thereby energy. The problem with this arises for instance when planning new real estate constructions when ventilation of this kind is an individual behaviour dependent factor, and thereby impossible to exactly predetermine. Today, a relatively unevaluated standard value is used for annual energy losses at 4 kWh/m2, but considering that these losses are hard to measure it is uncertain how well this number matche
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MacGilchrist, Graeme. "Lagrangian perspectives on ocean ventilation." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:de6c14b7-a55c-44e7-8c2b-2f94a601ab8e.

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Within the global climate system, the ocean operates as a vast store of important components such as heat and carbon dioxide that it exchanges with the atmosphere on timescales from days to millennia. Its facility to do so is in large part due to the process of ocean ventilation by which water is moved from the surface mixed layer, where it is in contact with the atmosphere, and transported through the subsurface. An understanding of ocean ventilation, therefore, is crucial in establishing the magnitudes and timescales of ocean-atmosphere exchange. In this thesis, a predominantly Lagrangian ap
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Schmidt, Andreas. "Atmung mit Pressure-Support-Ventilation und Proportional-Assist-Ventilation bei gesunden Probanden mit gesteigerter Elastance." [S.l.] : [s.n.], 1999. http://www.sub.uni-hamburg.de/disse/559/Disse.pdf.

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Chen, Huijuan. "Experimental and numerical investigations of a ventilation strategy – impinging jet ventilation for an office environment." Doctoral thesis, Linköpings universitet, Energisystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-106483.

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A well-functioning, energy-efficient ventilation system is of vital importance to offices, not only to provide the kind of comfortable, healthy indoor environment necessary for the well-being and productive work performance of occupants, but also to reduce energy use in buildings and the associated impact of CO2 emissions on the environment. To achieve these goals impinging jet ventilation has been developed as an innovative ventilation concept. In an impinging jet ventilation system, a high momentum of air jet is discharged downwards, strikes the floor and spreads over it, thus distributing t
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Latifi, Kujtim. "Assessment of the Dependence of Ventilation Image Calculation from 4D-CT on Deformation and Ventilation Algorithms." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3197.

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Ventilation imaging using 4D-CT is a convenient and cost effective functional imaging methodology which might be of value in radiotherapy treatment planning to spare functional lung volumes. To calculate ventilation imaging from 4D-CT we must use deformable image registration (DIR). This study validates the DIR methods and investigates the dependence of calculated ventilation on DIR methods and ventilation algorithms. The first hypothesis is if ventilation algorithms are robust then they will be insensitive to the precise DIR used provided the DIR is accurate. The second hypothesis is that th
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Chatterjee, Arnab. "Optimization of mine ventilation fan speeds according to ventilation on demand and time of use tariff." Diss., University of Pretoria, 2014. http://hdl.handle.net/2263/45900.

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With the growing concerns about energy shortage and demand supply imbalance, demand side management (DSM) activities has found its way into the mining industry. This study analyzes the potential to save energy and energy-costs in underground mine ventilation networks, by application of DSM techniques. Energy saving is achieved by optimally adjusting the speed of the main fan to match the time-varying flow demand in the network, which is known as ventilation on demand (VOD). Further cost saving is achieved by shifting load to off-peak or standard times according to a time of use (TOU) tar
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Koombua, Kittisak. "Multiscale Modeling of Airway Inflammation Induced by Mechanical Ventilation." VCU Scholars Compass, 2009. http://scholarscompass.vcu.edu/etd/1841.

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Mechanical ventilation (MV) is a system that partially or fully assists patients whose respiratory system fails to achieve a gas exchange function. However, MV can cause a ventilator-associated lung injury (VALI) or even contribute to a multiple organ dysfunction syndrome (MODS) in acute respiratory distress syndrome (ARDS) patients. Despite advances in today technologies, mortality rates for ARDS patient are still high. A better understanding of the interactions between airflow from mechanical ventilator and the airway could provide useful information used to develop a better strategy to vent
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