Literatura académica sobre el tema "Mechanical ventilation system"
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Artículos de revistas sobre el tema "Mechanical ventilation system"
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Kondili, Eumorfia, Demosthenes Makris, Dimitrios Georgopoulos, Nikoletta Rovina, Anastasia Kotanidou y Antonia Koutsoukou. "COVID-19 ARDS: Points to Be Considered in Mechanical Ventilation and Weaning". Journal of Personalized Medicine 11, n.º 11 (28 de octubre de 2021): 1109. http://dx.doi.org/10.3390/jpm11111109.
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The COVID-19 disease can cause hypoxemic respiratory failure due to ARDS, requiring invasive mechanical ventilation. Although early studies reported that COVID-19-associated ARDS has distinctive features from ARDS of other causes, recent observational studies have demonstrated that ARDS related to COVID-19 shares common clinical characteristics and respiratory system mechanics with ARDS of other origins. Therefore, mechanical ventilation in these patients should be based on strategies aiming to mitigate ventilator-induced lung injury. Assisted mechanical ventilation should be applied early in the course of mechanical ventilation by considering evaluation and minimizing factors associated with patient-inflicted lung injury. Extracorporeal membrane oxygenation should be considered in selected patients with refractory hypoxia not responding to conventional ventilation strategies. This review highlights the current and evolving practice in managing mechanically ventilated patients with ARDS related to COVID-19.
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Mammel, Mark C., Janice P. Ophoven, Patrick K. Lewallen, Margaret J. Gordon, Marylyn C. Sutton y Stephen J. Boros. "High-Frequency Ventilation and Tracheal Injuries". Pediatrics 77, n.º 4 (1 de abril de 1986): 608–13. http://dx.doi.org/10.1542/peds.77.4.608.
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Recent reports linking serious tracheal injuries to various forms of high-frequency ventilation prompted this study. We compared the tracheal histopathology seen following standard-frequency, conventional mechanical ventilation with that seen following high-frequency, conventional mechanical ventilation, and two different forms of high-frequency jet ventilation. Twenty-six adult cats were examined. Each was mechanically ventilated for 16 hours. Seven received standard-frequency, conventional mechanical ventilation at 20 breaths per minute. Seven received high-frequency, conventional mechanical ventilation at 150 breaths per minute. Six received high-frequency jet ventilation at 250 breaths per minute via the Instrument Development Corporation VS600 jet ventilator (IDC). Six received high-frequency jet ventilation at 400 breaths per minute via the Bunnell Life Pulse jet ventilator (BLP). A semiquantitative histopathologic scoring system graded tracheal tissue changes. All forms of high-frequency ventilation produced significant inflammation (erosion, necrosis, and polymorphonuclear leukocyte infiltration) in the trachea in the region of the endotracheal tube tip. Conventional mechanical ventilation produced less histopathology than any form of high-frequency ventilation. Of all of the ventilators examined, the BLP, the ventilator operating at the fastest rate, produced the greatest loss of surface cilia and depletion of intracellular mucus. IDC high-frequency jet ventilation and high-frequency, conventional mechanical ventilation produced nearly identical histologic injuries. In this study, significant tracheal damage occurred with all forms of high-frequency ventilation. The tracheal damage seen with high-frequency, conventional mechanical ventilation suggests that ventilator frequency, not delivery system, may be responsible for the injuries.
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Shi, Yan, Shuai Ren, Maolin Cai y Weiqing Xu. "Modelling and Simulation of Volume Controlled Mechanical Ventilation System". Mathematical Problems in Engineering 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/271053.
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Volume controlled mechanical ventilation system is a typical time-delay system, which is applied to ventilate patients who cannot breathe adequately on their own. To illustrate the influences of key parameters of the ventilator on the dynamics of the ventilated respiratory system, this paper firstly derived a new mathematical model of the ventilation system; secondly, simulation and experimental results are compared to verify the mathematical model; lastly, the influences of key parameters of ventilator on the dynamics of the ventilated respiratory system are carried out. This study can be helpful in the VCV ventilation treatment and respiratory diagnostics.
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Lozano-Zahonero, Sara, Matthias Schneider, Sashko Spassov y Stefan Schumann. "A novel mechanical ventilator providing flow-controlled expiration for small animals". Laboratory Animals 54, n.º 6 (19 de febrero de 2020): 568–75. http://dx.doi.org/10.1177/0023677220906857.
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For investigating the effects of mechanical ventilation on the respiratory system, experiments in small mammal models are used. However, conventional ventilators for small animals are usually limited to a specific ventilation mode, and in particular to passive expiration. Here, we present a computer-controlled research ventilator for small animals which provides conventional mechanical ventilation as well as new type ventilation profiles. Typical profiles of conventional mechanical ventilation, as well as flow-controlled expiration and sinusoidal ventilation profiles can be generated with our new ventilator. Flow control during expiration reduced the expiratory peak flow rate by 73% and increased the mean airway pressure by up to 1 mbar compared with conventional ventilation without increasing peak pressure and end-expiratory pressure. Our new ventilator for small animals allows for the application of various ventilation profiles. We could analyse the effects of applying conventional ventilation profiles, pressure-controlled ventilation and volume-controlled ventilation, as well as the novel flow-controlled ventilation profile. This new approach enables studying the mechanical properties of the respiratory system with an increased freedom for choosing independent ventilation parameters.
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Bubshait, Khlood y Yasmine Alabbasi. "Influence of Spontaneous and Mechanical Ventilation on Frequency-Based Measures of Heart Rate Variability". Critical Care Research and Practice 2021 (26 de diciembre de 2021): 1–9. http://dx.doi.org/10.1155/2021/8709262.
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Frequency-based measures of heart rate variability have been shown to be a useful physiological marker in both clinical and research settings providing insight into the functioning of the autonomic nervous system. Ongoing interactions between the autonomic nervous system control of the heart and lung occurs during each ventilation cycle because of their anatomical position within the closed thoracic cavity. Mechanical ventilation and subsequent removal change the normal ventilator mechanics producing alterations in the tidal volume, intrathoracic pressure, and oxygen delivery. A noninvasive method called heart rate variability (HRV) can be used to evaluate this interaction during ventilation and can be quantified by applying frequency-based measures of the variability between heartbeats. Although HRV is a reliable method to measure alteration of the autonomic nervous system (ANS) function and cardiopulmonary interaction, there have been limited reports concerning the changes in the frequency-based measure of HRV during both spontaneous and mechanical ventilation. The purpose of this methodological study is therefore to describe the physiological influence of both spontaneous and mechanical ventilation on frequency-based measures of HRV.
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Imanaka, Hideaki, Dean Hess, Max Kirmse, Luca M. Bigatello, Robert M. Kacmarek, Wolfgang Steudel y William E. Hurford. "Inaccuracies of Nitric Oxide Delivery Systems during Adult Mechanical Ventilation". Anesthesiology 86, n.º 3 (1 de marzo de 1997): 676–88. http://dx.doi.org/10.1097/00000542-199703000-00021.
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Background Various systems to administer inhaled nitric oxide (NO) have been used in patients and experimental animals. We used a lung model to evaluate five NO delivery systems during mechanical ventilation with various ventilatory patterns. Methods An adult mechanical ventilator was attached to a test lung configured to separate inspired and expired gases. Four injection systems were evaluated with NO injected either into the inspiratory circuit 90 cm proximal to the Y piece or directly at the Y piece and delivered either continuously or only during the inspiratory phase. Alternatively, NO was mixed with air using a blender and delivered to the high-pressure air inlet of the ventilator. Nitric oxide concentration was measured from the inspiratory limb of the ventilator circuit and the tracheal level using rapid- and slow-response chemiluminescence analyzers. The ventilator was set for constant-flow volume control ventilation, pressure control ventilation, pressure support ventilation, or synchronized intermittent mandatory ventilation. Tidal volumes of 0.5 l and 1 l were evaluated with inspiratory times of 1 s and 2 s. Results The system that premixed NO proximal to the ventilator was the only one that maintained constant NO delivery regardless of ventilatory pattern. The other systems delivered variable NO concentration during pressure control ventilation and spontaneous breathing modes. Systems that injected a continuous flow of NO delivered peak NO concentrations greater than the calculated dose. These variations were not apparent when a slow-response chemiluminescence analyzer was used. Conclusions NO delivery systems that inject NO at a constant rate, either continuously or during inspiration only, into the inspiratory limb of the ventilator circuit produce highly variable and unpredictable NO delivery when inspiratory flow is not constant. Such systems may deliver a very high NO concentration to the lungs, which is not accurately reflected by measurements performed with slow-response analyzers.
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Hao, Liming, Shuai Ren, Yan Shi, Na Wang, Yixuan Wang, Zujin Luo, Fei Xie, Meng Xu, Jian Zhang y Maolin Cai. "A Novel Method to Evaluate Patient-Ventilator Synchrony during Mechanical Ventilation". Complexity 2020 (15 de septiembre de 2020): 1–15. http://dx.doi.org/10.1155/2020/4828420.
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The synchrony of patient-ventilator interaction affects the process of mechanical ventilation which is clinically applied for respiratory support. The occurrence of patient-ventilator asynchrony (PVA) not only increases the risk of ventilator complications but also affects the comfort of patients. To solve the problem of uncertain patient-ventilator interaction in the mechanical ventilation system, a novel method to evaluate patient-ventilator synchrony is proposed in this article. Firstly, a pneumatic model is established to simulate the mechanical ventilation system, which is verified to be accurate by the experiments. Then, the PVA phenomena are classified and detected based on the analysis of the ventilator waveforms. On this basis, a novel synchrony index SIhao is established to evaluate the patient-ventilator synchrony. It not only solves the defects of previous evaluation indexes but also can be used as the response parameter in the future research of ventilator control algorithms. The accurate evaluation of patient-ventilator synchrony can be applied to the adjustment of clinical strategies and the pathological analyses of patients. This research can also reduce the burden on clinicians and help to realize the adaptive control of the mechanical ventilation and weaning process in the future.
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Pinsky, Michael R. "Mechanical ventilation and the cardiovascular system". Current Opinion in Critical Care 2, n.º 5 (octubre de 1996): 391–95. http://dx.doi.org/10.1097/00075198-199610000-00010.
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Wang, Yi, Yan Qiu Huang, Zhi Peng Li, Le Wang y Jie Gao. "Study on the Pollutant Control of Industrial Buildings with Mechanical Ventilation". Advanced Materials Research 243-249 (mayo de 2011): 4949–55. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.4949.
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The aim of this paper is to study the control effects of pollutants with different ventilation methods in industrial buildings. Comparative researches are conducted between the push-pull ventilation system and displacement ventilation system. Formaldehyde (HCHO) is selected as the main pollutant in the industrial buildings in this paper. The computational fluid dynamics (CFD) is used to analysis the space distribution of pollutant concentrations with the pollution sources at different locations. Through comparative study，the pollutants distribution with the same supply air volume and pollutants diffusion intensity are evaluated from the following two aspects. Firstly, when the height of the pollutant source is 1.2 m in the industrial building, the average concentration of the contaminant at the space section with push-pull ventilation system is relatively higher than that with displacement ventilation system. Secondly, the average concentration with push-pull ventilation system is 0.00058 kmol/m3 while displacement ventilation system is 0.00097 kmol/m3 when the height of the pollutant source is 0.6 m. And when it is 0.3 m, they are 0.00016 kmol/m3 and 0.0017 kmol/m3 respectively. Thus, the concentration of the contaminant in displacement ventilation is higher than the push-pull ventilation’s with the location of the pollution source continuously declining in the height direction.
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Shen, Dongkai, Qian Zhang y Yan Shi. "Dynamic Characteristics of Mechanical Ventilation System of Double Lungs with Bi-Level Positive Airway Pressure Model". Computational and Mathematical Methods in Medicine 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/9234537.
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In recent studies on the dynamic characteristics of ventilation system, it was considered that human had only one lung, and the coupling effect of double lungs on the air flow can not be illustrated, which has been in regard to be vital to life support of patients. In this article, to illustrate coupling effect of double lungs on flow dynamics of mechanical ventilation system, a mathematical model of a mechanical ventilation system, which consists of double lungs and a bi-level positive airway pressure (BIPAP) controlled ventilator, was proposed. To verify the mathematical model, a prototype of BIPAP system with a double-lung simulators and a BIPAP ventilator was set up for experimental study. Lastly, the study on the influences of key parameters of BIPAP system on dynamic characteristics was carried out. The study can be referred to in the development of research on BIPAP ventilation treatment and real respiratory diagnostics.
Tesis sobre el tema "Mechanical ventilation system"
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Gillott, Mark C. "A novel mechanical ventilation heat recovery/heat pump system". Thesis, University of Nottingham, 2000. http://eprints.nottingham.ac.uk/12148/.
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The trend towards improving building airtightness to save energy has increased the incidence of poor indoor air quality and associated problems, such as condensation on windows, mould, rot and fungus on window frames. Mechanical ventilation/heat recovery systems, combined with heat pumps, offer a means of significantly improving indoor air quality, as well as providing energy efficient heating and cooling required in buildings. This thesis is concerned with the development of a novel mechanical ventilation heat recovery/heat pump system for the domestic market. Several prototypes have been developed to provide mechanical ventilation with heat recovery. These systems utilise an annular array of revolving heat pipes which simultaneously transfer heat and impel air. The devices, therefore, act as fans as well as heat exchangers. The heat pipes have wire finned extended surfaces to enhance the heat transfer and fan effect. The systems use environmentally friendly refrigerants with no ozone depletion potential and very low global warming potential. A hybrid system was developed which incorporated a heat pump to provide winter heating and summer cooling. Tests were carried out on different prototype designs. The type of tinning, the working fluid charge and the number and geometry of heat pipes was varied. The prototypes provide up to 1000m3/hr airflow, have a maximum static pressure of 220Pa and have heat exchanger efficiencies of up to 65%. At an operating supply rate of 200m3/hr and static pressure 100Pa, the best performing prototype has a heat exchanger efficiency of 53%. The heat pump system used the hydrocarbon isobutane as the refrigerant. Heating COPs of up to 5 were measured. Typically the system can heat air from 0°C to 26°C at 200m3/hr with a whole system COP of 2. The contribution to knowledge from this research work is the development of a novel MVHR system and a novel MVHR heat pump system and the establishment of the performances of these systems.
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Ali, Sadaqat y Possavee Thummakul. "Mapping and analyzing Ventilation system in University building". Thesis, Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-12397.
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This Master Studies Thesis of Quality in Process Technology deals with Process Improvement. The ventilation system of University building is dealt as a Process and is looked for improvements. The ventialtion system for two computer rooms is studied and analyzed for the variaitons in the operating conditions.
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Piippo, Kaj. "Assessment of Energy Recovery Technology in China : Mechanical ventilation system with energy recovery". Thesis, Eskilstuna : Mälardalen University. School of Sustainable Development of Society and Technology, 2008. http://www.diva-portal.org/smash/get/diva2:127022/FULLTEXT01.
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Júnior, Marcus Henrique Victor. "Implementation and assessment of a novel mechanical ventilatory system following a noisy ventilation regime". Instituto Tecnológico de Aeronáutica, 2014. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=3151.
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This study concerns the development of a novel mechanical ventilation system, with a view to analysing the results of a new mechanical ventilation technique, referred to noisy ventilation. Additionally, the study addresses the assessment of the system, involving the estimation of certain mechanical parameters of the respiratory system under noisy ventilation and discusses a pilot trial in vivo, with a pig. During acute respiratory failure, intubation and invasive mechanical ventilation may be life saving procedures. The general aim of mechanical ventilation is to provide adequate gas exchange support, while not damaging the respiratory system. This technique is one of the most important life support tools in the intensive care unit. However, it may also be harmful by causing ventilator induced lung injury and other undesirable effects. There is a growing interest in the development and use of variable mechanical ventilation performing variable volume and variable pressure controlled ventilation. The reasons are that this technique can improve lung functions and reduce lung damage, when compared to standard mechanical ventilation. Moreover, variable ventilation can improve lung mechanics and gas exchanges. The new ventilation system has to have the capabilities to perform a noisy ventilation regime, besides the standard mechanical ventilation. The development started with commercial devices: a mechanical ventilator and a personal computer, whose roles were to execute the noisy ventilation regime and to implement the new ventilation pattern by means of a ventilation routine, commanding the mechanical ventilator. After these two components were working together, a bench test was performed, in which a calibrated measuring device and a mechanical lung simulator were utilized. Considering that the system was working properly, it was possible to validate it by analysing the results. As the mechanical properties of the respiratory system are important quantities to know, a parameter estimation method was developed, with a view to estimating some relevant properties, such as compliance, positive end--expiratory pressure, resistance and others. The estimates were related to the adopted model for the respiratory system. In this study, four models were discussed: first order linear model, flow dependent resistance model, volume dependent elastance model and second order linear model. For each one, all parameters were estimated and the outcomes from each estimation were compared with the others, with a view to finding relationships between them and to evaluating the goodness of each model. Furthermore, as some parameters could be adjusted directly in the devices, adjusted and estimated values could also be compared. Finally, one trial in vivo was performed, with a view to assessing the behaviour of the system in a real situation and to showing the developed system to the research team. The system was set to work in a noisy and in a standard ventilation regime. It showed reasonable results in terms of quality of ventilation as well as reliability and maintainability of the ventilatory regime, during the whole test period. The developed parameter estimation methods were utilized to estimate the mechanical respiratory properties of the animal under test and to find cross relationships between these outcomes and others, such as those from blood gas, ultrasonography and electrical impedance tomography.
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Nilsson, Willkomm Josefine. "Comparison of a hybrid ventilation system and a mechanical ventilation system with heat recovery through life cycle assessment : A case study of a modern Danish office building". Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-78758.
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The building sector is responsible for 36% of the energy usage and 39 % of all CO2- emissions in European union (EU). Therefore, it is of great interest to investigate how the building sector can become more energy efficient and lower the environmental impact. It is reported that 80-90 % of a building’s total energy usage occurs during the operational phase. The energy usage is mainly due to lightning, technical equipment and the heating, cooling and ventilation system (HVAC-system). During the last century the energy efficiency in lightning developed significantly meaning the energy used in the HVAC-system becomes increasingly significant. As EU aim to increase the energy efficiency and the ratio of renewable energy in the grid, one can assume that the importance of other phases in the HVAC system lifecycle will be increasingly interesting as for example the manufacturing process and material usage which can be evaluated through life cycle assessment (LCA).This thesis presents a comparison between the environmental impacts of a hybrid ventilation (HV) system and a mechanical ventilation system with heat recovery (MVHR) system through a LCA perspective designed for an office building in Lystrup, Denmark. The office building in Lystrup, Denmark was chosen as the HV system is implemented there. The HV system consists of an automated natural ventilation (NV) system and a mechanical exhaust air ventilation (MEV) system. The environmental impact from the NV was provided through environmental products declarations provided by the company dimensioning the NV system. The data was lacking for the MEV system and that system was therefore dimensioned and evaluated through LCA. The mechanical ventilation system chosen for comparison is a mechanical ventilation system with heat recovery (MVHR) decided by the commissioner of the project, Sweco AB. The MVHR system was dimensioned as well. The project was significantly affected by lack of data resulting in many assumptions. The system boundary of the life cycle was set to cradle to grave excluding the energy usage of producing the ventilation components. The assumed lifetime is 25 years. Gabi Education software was used for calculating the LCA results. The impact categories chosen are global warming potential (GWP), ozone depletion potential (ODP), acidification potential (AP), eutrophication potential (EP), photochemical ozone depletion potential (PODP), abiotic depletion potential (ADP) elements and ADP fossil which are used in the EN15804 standard when conducting LCA for construction components. The CML2001-IA 2001 IA method was used for the life cycle impact assessment in the LCA software which also is recommended according to EN15804.The LCA results were compared between the systems and interpreted through contribution analysis were the result was divided in the following categories; Energy usage (use phase), transportation, material usage (including raw material extraction and material processing) and end of life treatment. The two systems score similarly on all environmental impacts categories except for the global warming potential (GWP) and the abiotic depletion potential (ADP) fossil were the MVHR system scores approximately 3 times higher than the HV system. The MVHR system consumes approximately 3 times more energy during the use phase. The contribution analysis showed that the energy usage (use phase) dominated the contribution in almost all environmental impact categories. Further, the environmental impact caused by the material usage was compared between the MVHR - and HV system and the MVHR system scored higher in all categories except ADP elements.The conclusion drawn from this report is that the HV system is better if one looks to GWP and ADP fossil. The HV contributes less to climate change which is an important environmental concern. Further, the energy usage during use phase contributed most to environmental impacts for both the MVHR - and HV system. The environmental impact of the material usage is less for the HV - compared with the MVHR system.Byggnadssektorn står för 36 % av energianvändningen och 39 % av alla koldioxidutsläpp i Europeiska unionen (EU). Därför är det av stort intresse att undersöka hur byggsektorn kan bli mer energieffektiv och undersöka hur dess miljöpåverkan kan minskas. Det rapporteras att 80–90 % av en byggnads totala energianvändningen inträffar under driftsfasen. Energianvändningen beror främst på belysning och värme-, kyla- och ventilationssystemet (VVS-systemet). Under det sista århundradet har energieffektiviteten gällande belysning förbättrats avsevärt, vilket innebär att betydelsen för energianvändningen till VVS-systemet ökat. Eftersom EU strävar efter att öka energieffektiviteten och mängden förnybar energi i elnätet kan man anta att betydelsen av andra faser i VVS-systemets livscykel kommer att bli allt mer intressant, till exempel tillverkningsprocessen och materialanvändningen vilket kan utvärderas genom livscykelanalys (LCA). Denna rapport jämför miljöpåverkan från ett hybridventilationssystem (HV) med ett mekaniskt ventilationssystem med värmeåtervinningssystem (FTX-system) ur ett LCA-perspektiv. Studien utförs på kontorsbyggnad i Lystrup, Danmark. Kontorsbyggnaden i Lystrup valdes eftersom ett HV-systemet är implementerat där. HV-systemet består av ett automatiserat naturligt ventilationssystem (NV) och ett mekaniskt frånluftsventilationssystem (F-system). Miljöpåverkan från det NV-systemet tillhandahölls ur miljöproduktdeklarationer (EPD:er) som dimensioneringsföretaget tillhandahöll. Uppgifterna saknades för F-systemet och därför dimensionerades det förhand för att sedan utvärderades genom LCA. Hv-systemet jämfördes mot ett FTX system vilket bestämdes av uppdragsgivaren på företaget Sweco AB. FTX-systemet dimensionerades också förhand för att sedan utvärderas genom LCA. Livscykelns systemgräns sattes till från ”vagga-till-grav” exklusive energianvändningen för att producera ventilationskomponenterna då denna data saknades. Den antagna livslängden för ventilationssystemen är 25 år. LCA programvaran Gabi Education användes för att beräkna LCA resultaten. De miljöpåverkanskategorier som undersökts i den här studien är: global uppvärmningspotentialen, ozonuttunnande potential, försurningspotential, eutrofieringspotential, fotokemisk ozonuttunningspotential, abiotisk utarmningspotential (material) och abiotisk utarmningspotential (fossila bränslekällor) vilka skall användas enligt EN15804-standarden då LCA:er utförs på byggkomponenter. CML2001-IA metoden användes som livscykelkonsekvensbedömningen LCA-programvaran, vilket också rekommenderas enligt EN15804. LCA-resultaten jämfördes mellan systemen och tolkades genom en bidragsanalys där resultatet delades in i följande kategorier: Energianvändningen (användningsfas), transport, materialanvändning (inklusive råvaruutvinning och materialbearbetning) och slutanvändningsfasen för komponenterna. De två systemen var likvärdiga i de flest miljöpåverkanskategorier utom den globala uppvärmningen potential och abiotiska utarmning potential fossil där FTX-systemet bidrog med ungefär 3 gånger så hög potentiell påverkan än det HV-systemet. FTX-systemet förbrukar ungefär 3 gånger mer energi under användningsfasen. Bidragsanalysen visade att energianvändningen (under användningsfasen) var den dominerade faktorn i nästan alla kategorier av miljöpåverkan. Utöver denna analysen jämfördes miljöpåverkan orsakad av materialanvändningen mellan FTX - och HV-systemet, där FTX-systemet fick högre poäng i alla kategorier utom i abiotiska utarmnings potential (material). Slutsatsen från den här studien är att det HV-systemet är bättre om man ser till global uppvärmningspotential och abiotisk utarmningspotential fossil. Det HV-system har alltså mindre potential till att bidra till klimatförändringar och mindre potential att utarma fossila bränslekällor. Enligt den här studien är energianvändningen under användningsfasen den faktor som bidrar mest till miljöpåverkanskategorierna för både FTX - och det HV-systemet. Miljöpåverkan orsakad av materialåtgången är mindre för det HV-systemet än FTX systemet.
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KIESI, MIKKO y SJÖBLOM ROBERT AXELSSON. "Model based design of an expiratory valve and voice-coil actuator and evaluation of complete expiratory system performance with a PI controller". Thesis, KTH, Maskinkonstruktion (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-193143.
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Mechanical ventilators are devices in critical care to assist breathing in case of expiratory dysfunction. The expiratory valve is a critical component to the ventilator as it controls the pressure in the patient’s lungs. The design process of a new expiratory valve assembly is a time consuming one due to the wide range of possible design solutions both the voice-coil actuators and membrane valves typically used in ventilators. This thesis evaluates the possibility of creating and using analytical models for model based development to speed up the early design phases of a expiratory valve assembly. The main components, voice-coil actuator and membrane valve are modelled separately and experimentally verified. A complete expiratory system model and hardware-in-the-loop test setup are constructed in order to explore how well can the dynamic properties and control performance of valve assembly be predicted. Finally various questions in the valve assembly design are explored and a new design is proposed to demonstrate the capabilities of the model based approach. The resulting voice-coil and membrane valve models can be considered accurate enough for fast exploration of the design space, as an error rate below 10% is reached without manual tuning for each design.Mekaniska ventilatorer är en utrustning inom intensivvården för assisterad andning för patienter med nedsatt andningsförmåga. Utandningsventilen är en kritisk komponent till ventilatorn då den kontrollerar lungtrycket hos patienten. Design processen för en ny utandningsventil är en tidskrävande process mycket på grund av den mängd olika design möjligheter som kan utforskas för både talspole aktuatorn samt membran ventilen som oftast används i ventilatorerna. I detta examensarbete utforskades möjligheterna till att skapa och använda analytiska modeller för modellbaserad utveckling för att accelerera de tidiga design stadierna för en utandningsventil. Huvudkomponenterna, talspole aktuatorn och membran ventilen är modellerade separat och experimentellt verifierade. En fullständig modell för hela utandningssystemet samt en hardware-in-the-loop test plattform är konstruerad för att utforska hur väl de dynamiska egenskaperna samt kontroll prestandan för en utandningsventil kan prediceras. Slutligen utforskas diverse frågor angående ventil designen och en ny design föreslås för att demonstrera möjligheterna med en modellbaserad metod. Den slutliga modellen för både talspole aktuatorn och membran ventilen kan betraktas som tillräcklig precisa för snabb utforskning inom de olika design möjligheterna, då en felprocent under 10% är uppnådd utan manuell finjustering för varje design.
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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 influencing mortality. The efforts to avoid additional ventilator-induced injury to patients are embodied in the expression ‘protective ventilation’. With the use of pig models we have examined the impact of protective ventilation on systemic inflammation, on organ-specific inflammation and on bacterial growth during pneumonia. Additionally, with a 30-hour ventilator-associated pneumonia model we examined the influence of mechanical ventilation and systemic inflammation on bacterial growth. Systemic inflammation was initiated with surgery and enhanced with endotoxin. The bacterium used was Pseudomonas aeruginosa. We found that protective ventilation during systemic inflammation attenuated the systemic inflammatory cytokine responses and reduced secondary organ damage. Moreover, the attenuated inflammatory responses were seen on the organ specific level, most clearly as reduced counts of inflammatory cytokines from the liver. Protective ventilation entailed lower bacterial counts in lung tissue after 6 hours of pneumonia. Mechanical ventilation for 24 h, before a bacterial challenge into the lungs, increased bacterial counts in lung tissue after 6 h. The addition of systemic inflammation by endotoxin during 24 h increased the bacterial counts even more. For comparison, these experiments used control groups with clinically common ventilator settings. Summarily, these results support the use of protective ventilation as a means to reduce systemic inflammation and organ injury, and to optimize bacterial clearance in states of systemic inflammation and pneumonia.
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Galia, Fabrice. "Supervision automatique de la ventilation artificielle en soins intensifs : investigation d'un système existant et propositions d'extensions". Phd thesis, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00627248.
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Les objectifs de la thèse sont l'a nalyse approfondie d'un système de supervision automatique de la ventilation artificielle des patients hospitalisés en soins intensifs et l'élaboration de solutions pour améliorer et étendre son fonctionnement. Ce système adapte l'assistance en pression de la ventilation spontanée avec aide inspiratoire (AI) par un rétrocontrôle basé sur la fréquence respiratoire du patient et, comme variables de "sécurité", le volume courant et le CO2 de fin d'expiration (etCO2). Il établit ainsi une classification ventilatoire et règle un niveau de pression d'AI.Sur la base d'études publiées rapportant des limitations, d'analyses d'une base de données rétrospectives acquises sur patient, d'études sur banc-test et d'études observationnelles prospectives réalisées chez les patients, nous avons étudié précisément le fonctionnement du système. Pour la plupart des limitations, une solution a été proposée et évaluée sur banc. A partir d'une étude clinique, nous avons proposé une amélioration de la procédure de traitement du signal etCO2 par le système. En nous basant sur les observations de la base de données, nous avons décrit une procédure automatisée de sevrage de la PEP dont un niveau supérieur à 5 mbar entrave le sevrage par le système. Sur le même principe, nous avons souhaité, en amont de l'AI, tenter d'automatiser un changement de mode depuis la ventilation assistée contrôlée. Au travers d'une étude clinique, nous avons déterminé des critères ventilatoires qui pourraient permettre d'automatiser cette procédure. L'ensemble a permis la définition d'une méthodologie d'évaluation et d'amélioration d'un système automatisé de ventilation artificielle
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Assunção, Renata Pletsch. "Análise dos critérios para ajuste do suporte ventilatório da ventilação mecânica". Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/5/5150/tde-06022017-085815/.
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Introdução: A assistência ventilatória adequada é imprescindível para o tratamento do paciente ventilado artificialmente. A busca por parâmetros para realizar o ajuste ótimo e que tenham aplicação fácil a beira leito como, por exemplo, métodos não-invasivos, são desejáveis. Objetivo: analisar a acurácia diagnóstica das variáveis do padrão respiratório, da P0.1 esofágica e traqueal, para o ajuste da assistência ventilatória em pressão de suporte. Métodos: Vinte e sete pacientes internados em unidade de terapia intensiva foram consecutivamente incluídos no estudo. Todos pacientes estavam no modo de pressão de suporte, que foi aumentada para 20 cmH2O e diminui em passos de 3 cmH2O, até 2 cmH2O ou antes se o paciente apresentasse sinais de desconforto respiratório. Os pacientes foram monitorizados com cateteres para medidas de pressão esofágica e gástrica, com uma peça proximal ao tubo para mensurar a pressão traqueal a partir da oclusão da via aérea e com um pneumotacógrafo para medidas de fluxo. Durante todos níveis de suporte, foram gravados os dados dos cateteres esofágicos, gástricos, da traquéia, dados hemodinâmicos e do padrão respiratório. O ajuste da assistência ventilatória foi classificado como adequado, insuficiente e excessivo de acordo com critérios pré-estabelecidos. Resultados: Foram analisados 210 períodos com diferentes pressões de suporte e em 49% destes períodos a assistência foi excessiva, enquanto em 3,8% a assistência foi insuficiente. No início do estudo, enquanto os pacientes ainda estavam com a assistência ventilatória ajustada pela equipe assistente, 48,2% apresentavam assistência ventilatória excessiva. Pela pequena incidência de períodos com assistência ventilatória insuficiente, não foi avaliado a acurácia das variáveis para diagnóstico de assistência insuficiente. Para diagnosticar assistência ventilatória excessiva, a variável do padrão respiratório que se mostrou mais acurada foi a frequência respiratória, com sensibilidade de 90% e especificidade de 88% quando a frequência respiratória foi menor que 17 incursões por minuto. Outras variáveis do padrão respiratório não mostraram elevada acurácia. Também para o diagnóstico de assistência excessiva, foi elevada a acurácia da P0.1 esofágica (sensibilidade de 81% e especificidade de 70% quando P0.1 <= 1,9) e da P0.1 traqueal (sensibilidade de 81% e especificidade de 70% quando P0.1 <= 2,1). Conclusão: A ocorrência de assistência ventilatória excessiva foi significativamente maior que a assistência ventilatória insuficiente. A frequência respiratória menor que 17 foi a variável do padrão respiratório com maior acurácia para diagnosticar assistência ventilatória excessiva. As P0.1 esofágica e traqueal também tiveram acurácia elevas, mas menores que a frequência respiratória .Introdution: The adequate assistance is essential for the treatment of mechanically ventilated patient. The search of parameters to achieve the optimal adjustment and with easy application to bedside, for example, non-invasive methods. Objective: Analyze the diagnostic accuracy of the breathing pattern variables, esophageal and tracheal P0.1 for adjustment of mechanical ventilation in pressure support ventilation. Methods: Twenty-seven patients in intensive care unit were consecutively included in the study. All patients were in the pressure support mode, which was raised to 20 cmH2O and decreased in steps of 3 cmH2O up to 2 cmH2O or earlier if the patient had signs of respiratory distress. Patients were monitored with catheters for esophageal and gastric pressure measurements, with the T-piece was used close to the tube to measure tracheal pressure during an airway occlusion and a pneumotachograph for flow measurements. Data was recorded for all support levels to esophageal, gastric, and tracheal pressures, also hemodynamic data and ventilatory pattern. The adjustment of mechanical ventilation was classified as adequate assistance, overassistance and underassistance according to pre-established criteria. Results: Two hundred and ten periods were analyzed with different pressures of support and 49% of these periods were overassistance, while 3,8% these periods were underassistance. At baseline, while patients were still ventilatory assistance set by assistance staff, 48,2% had overassistance. Due to the low incidence of periods with underassistance, the variables accurancy has not been evaluated. The variable breathing pattern that was more accurate diagnosing overassistance was the respiratory rate (90% sensitivity and specificity of 88 % when the respiratory rate was less than 17 breaths per minute). Other variables of the breathing pattern did not show high accuracy although esophageal P0.1 (sensitivity 81 % and specificity of 70 % when P0.1 <= 1,9) and tracheal P0.1 (sensitivity 81 % and specificity of 70 % when P0.1 <= 2,1) were high accuracy diagnosing overassistance. Conclusion: The occurrence of overassistance was significantly higher than underassistance. The respiratory rate below 17 was the variable breathing pattern more accurate to predict overassistance. The esophageal and tracheal P0.1 also had high accuracy but lower than the respiratory rate
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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 increasingly used because of the low heating or cooling demand and, at the same time, for the good thermal comfort they assure.
The thermal output estimation of radiant system in steady state condition needs the determination of the convective heat transfer coefficient from the surface to the room; a critical review among the correlations available in literature have been carried out and correlations for heated ceiling and cooled floor have been presented. Furthermore the variation of convective heat transfer coefficients, depending on the considered ventilation systems, has been estimated by means of the Computational Fluid Dynamics (CFD) technique.
The energy performance and thermal behavior of radiant systems during transient conditions have been predicted by using experimental tests and numerical calculations with the software Digithon that was developed by the University of Padua. In this work the validation of this software by comparison with experimental data has been presented.
In new and renovated buildings the high tightness and high insulation determine a potential risk of poor indoor air quality and condensation at the surfaces; for this reason an efficient ventilation system is necessary to provide for fresh air in the rooms. In a low polluted building air quality depends on human bioeffluents, among which carbon dioxide is considered the most significant one. By using numerical simulations (CFD) the effects of the supply and extract air terminals on contaminants distribution in offices equipped with a cooled ceiling has been investigated. Besides, in order to fully characterize the indoor climate of residential rooms or offices, an extensive experimental study has been carried out in a test room to determine both thermal comfort and ventilation effectiveness for different solutions of mixing ventilation and displacement ventilation combined with floor radiant systems. In particular, the effects of supply and extract air terminals positions by using low air change rates in mixing ventilation and the effects of different ventilation rates with displacement ventilations terminals have been analyzed. Results from experiments have been used for the validation of a CFD model for the prediction of air distribution in rooms equipped with mixed or displacement ventilation, combined with heating/cooling floor systems.In questo lavoro di dottorato vengono presentati i risultati di uno studio sui sistemi radianti per il raffrescamento ed il riscaldamento in ambito civile e sulla loro integrazione con opportuni sistemi di ventilazione meccanica. Le prestazioni energetiche in regime stazionario e transitorio, così come le prestazioni di comfort termico e di qualità dell’aria garantita, sono state studiate mediante l’ausilio di prove sperimentali, di simulazioni fluidodinamiche e di altri codici di calcolo. Gli studi sperimentali sono stati realizzati in parte in Italia, presso i laboratori dell’azienda RHOSS S.p.A di Codroipo (Udine), e in parte presso i laboratori dell’ICIEE (International Centre for Indoor Environment and Energy), dell’Università Tecnica di Danimarca, (DTU) a Lyngby (DK). L’aspetto più rilevante di questo lavoro è legato alla sempre maggiore diffusione dei sistemi radianti come soluzione per il riscaldamento ed il raffrescamento di ambienti interni, in quanto combinano vantaggi energetici ad elevati livelli di comfort termico. Per ragioni dovute alla piccola differenza di temperatura tra l’ambiente e il fluido termovettore, i sistemi radianti si interfacciano molto bene con caldaie a condensazione, pompe di calore, sistemi free cooling, collettori solari e altre sorgenti rinnovabili e soluzioni ad alta efficienza energetica. Il calcolo della resa termica di tali sistemi viene eseguito mediante le equazioni valide per la convezione in regime stazionario, come quelle fornite dalle norme Europee EN 1264 ed EN 15377. In letteratura esistono numerose correlazioni valide per il calcolo della potenza convettiva di superfici orizzontali e verticali e di superfici interne di stanze reali; le norme EN 1264 ed EN 15377 consigliano correlazioni diverse e lo stesso accade per codici si simulazione energetica degli edifici. Ad oggi non è disponibile una chiara definizione di coefficiente di scambio termico convettivo per i sistemi radianti, specialmente per quanto riguarda pavimenti freddi e soffitti caldi. Il primo obiettivo di questa tesi è stato di realizzare un’analisi critica delle correlazioni disponibili in letteratura adatte ai sistemi radianti e di proporre delle equazioni per ogni configurazione di riscaldamento o raffrescamento da soffitto, pavimento o parete. In ambito residenziale il pavimento radiante rappresenta una delle soluzioni più richieste grazie all’elevato livello di comfort termico garantito; tuttavia, al fine di migliorare la qualità dell’aria e specialmente a causa della necessità di deumidificare l’aria in estate per evitare formazione di condensa, accanto al sistema radiante andrebbe installato un sistema di ventilazione meccanica. L’aria primaria in estate è solitamente a temperatura più bassa della temperatura della stanza e dotata di una certa velocità; nel caso di immissione da bocchette installate vicino ad una superficie radiante, lo scambio convettivo potrebbe venire variato rispetto ad una soluzione senza ventilazione. Mediante uno studio con simulazioni fluidodinamiche CFD è stato possibile valutare l’incremento dello scambio convettivo da un soffitto freddo mediante lo sfruttamento di aria primaria. I sistemi radianti, in particolare i sistemi a soffitto, rappresentano un’ottima soluzione per rimuovere i carichi termici degli uffici durante il periodo estivo, ma allo stesso tempo possono essere usati per il riscaldamento invernale degli stessi con buone prestazioni energetiche e di comfort termico. La differenza sostanziale è che durante la stagione invernale il sistema radiante si trova a lavorare prevalentemente in regime stazionario, mentre durante la stagione estiva i carichi esterni dovuti alla radiazione solare e all’escursione diurna, accompagnati da carichi interni dovuti all’occupazione umana, determinano condizioni piuttosto variabili durante la giornata. Il comportamento di sistemi radianti a regimi stazionari e transitori sono state studiate mediante prove in camera climatica; inoltre un modello di calcolo chiamato Digithon, sviluppato all’interno del Dipartimento di Fisica Tecnica dell’Università di Padova, è stato validato mediante un confronto con dati sperimentali. Seguendo un’opportuna procedura, riportata nella tesi, è stato possibile impostare dei profili di carico che simulano una tipica giornata estiva o invernale su una parete della stanza ed è stato studiato come il soffitto radiante reagisca per cercare di mantenere una certa temperatura di comfort nella stanza. Al fine di mantenere una buona qualità dell’aria, evitare la formazione di condensa, ma anche per incrementare la capacità di raffrescamento quando richiesto, i sistemi radianti per gli uffici andrebbero sempre associati a sistemi di ventilazione meccanica. Accanto ai tradizionali sistemi a soffitto con ventilazione a miscelazione, le soluzioni con ventilazione a dislocamento accoppiate a sistemi a pavimento o a soffitto sono alternative di crescente interesse per gli uffici. In edifici dove sia bassa la quantità di inquinanti emessi dai materiali edili, dai mobili e dalle attrezzature, la quantità di bioeffluenti dagli occupanti, dei quali l’anidride carbonica CO2 è normalmente usata come principale indicatore, è determinante per la qualità dell’aria interna. La capacità di rimozione dei contaminanti e, parallelamente, la capacità di immettere aria pulita negli ambienti sono espresse dall’efficienza di ventilazione (ventilation effectiveness). Mediante simulazione fluidodinamiche CFD è stato possibile confrontare l’efficienza di rimozione dei contaminanti utilizzando diverse soluzioni di ventilazione a dislocamento piuttosto che soluzioni tradizionali a miscelazione. La qualità di un ambiente interno andrebbe misurata in termini sia di comfort termico garantito all’occupante che di qualità dell’aria. Attraverso prove sperimentali in laboratorio, i principali indici di comfort termico e di efficienza di ventilazione sono stati determinati per diverse configurazioni di ventilazione a miscelazione e di ventilazione a dislocamento in ambienti rappresentativi di applicazioni residenziali o del terziario. I risultati sono stati in seguito utilizzati per effettuare una validazione di un modello fluidodinamico (CFD) creato per la previsione del movimento dell’aria in ambienti residenziali o uffici.
Libros sobre el tema "Mechanical ventilation system"
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Respiratory system and artificial ventilation. Milan: Springer, 2008.
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A, Moore James. Troubleshooting a mechanical ventilation system for livestock or poultry housing. [Corvallis, Or.]: Oregon State University Extension Service, Washington State University Cooperative Extension, the University of Idaho Cooperative Extension Service and the U.S. Dept. of Agriculture, 1986.
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Sheet Metal and Air Conditioning Contractors' National Association (U.S.), ed. Residential comfort system installation standards manual. 7a ed. Chantilly, VA: SMACNA, 1998.
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Potter, I. N. CO2 controlled mechanical ventilation systems. Bracknell: Building Services Research and Information Association, 1994.
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Timothy, Mayo, Prowskiw G, Canada Centre for Mineral and Energy Technology. Efficiency and Alternative Energy Technology Branch. y Unies Ltd, eds. Utilization of residential mechanical ventilation systems. Ottawa: CANMET, Efficiency and Alternative Energy Technology Branch, 1992.
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Chartered Institution of Building Services Engineers, ed. Improved life cycle performance of mechanical ventilation systems. London: CIBSE, 2003.
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Proskiw, G. Field performance of various types of residential mechanical ventilation systems. [Ottawa, Ont.]: Energy, Mines and Resources Canada, 1992.
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Krigger, John. Saturn mechanical systems field guide. [Helena, MT]: Saturn Resource Management, 2006.
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W, Haines Roger. Control Systems for Heating, Ventilating, and Air Conditioning. Boston, MA: Springer US, 1993.
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M, Porterfield John, Kirsininkas Ronald y Balderas David, eds. Mechanical systems retrofit manual: A guide for residential design. New York: Van Nostrand Reinhold Co., 1987.
Buscar texto completoCapítulos de libros sobre el tema "Mechanical ventilation system"
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Lofaso, Frédéric y Hélène Prigent. "Carbon Dioxide Rebreathing During Pressure Support Ventilation with Airway Management System (BiPAP) Devices". En Noninvasive Mechanical Ventilation, 83–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11365-9_13.
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Hutchison, Alastair A., Francis Leclerc, Véronique Nève, J. Jane Pillow y Paul D. Robinson. "The Respiratory System". En Pediatric and Neonatal Mechanical Ventilation, 55–112. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-01219-8_4.
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Say, Gorkem, Nurullah Akkaya, Ersin Aytac, Sanan Abizada, Tolga Yirtici, Kemal Ruso, Irfan Gunsel, Murat Tuzunkan y Rahib H. Abiyev. "Fuzzy Control of Mechanical Ventilation System". En 11th International Conference on Theory and Application of Soft Computing, Computing with Words and Perceptions and Artificial Intelligence - ICSCCW-2021, 347–54. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92127-9_48.
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Rimensberger, Peter C., Sven M. Schulzke, David Tingay y Britta S. von Ungern-Sternberg. "Monitoring of the Mechanical Behaviour of the Respiratory System During Controlled Mechanical Ventilation". En Pediatric and Neonatal Mechanical Ventilation, 421–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-01219-8_13.
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Joza, Stephen y Martin Post. "Development of the Respiratory System (Including the Preterm Infant)". En Pediatric and Neonatal Mechanical Ventilation, 3–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-01219-8_1.
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Zin, W. A. y R. F. M. Gomes. "Mechanical models of the respiratory system: linear models". En Basics of Respiratory Mechanics and Artificial Ventilation, 87–94. Milano: Springer Milan, 1999. http://dx.doi.org/10.1007/978-88-470-2273-7_7.
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Haaksma, Mark E., Marry R. Smit y Pieter R. Tuinman. "Ultrasound Assessment of the Respiratory System". En Mechanical Ventilation from Pathophysiology to Clinical Evidence, 341–52. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-93401-9_32.
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Guerin, Claude y Jean-Christophe Richard. "Measurement of respiratory system resistance during mechanical ventilation". En Applied Physiology in Intensive Care Medicine, 17–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-01769-8_5.
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Guerin, Claude y Jean-Christophe Richard. "Measurement of respiratory system resistance during mechanical ventilation". En Applied Physiology in Intensive Care Medicine 1, 17–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28270-6_5.
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Do, Khoi y Guido Musch. "Basic Physiology of Respiratory System: Gas Exchange and Respiratory Mechanics". En Mechanical Ventilation from Pathophysiology to Clinical Evidence, 3–12. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-93401-9_1.
Texto completoActas de conferencias sobre el tema "Mechanical ventilation system"
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Yongliang Zhang, Yongliang y Qinglei Qinglei Tan. "Application of Natural Ventilation in Metal Mine Ventilation System". En 2015 International Conference on Mechanical Science and Engineering. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/mse-15.2016.11.
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Abdelmaksoud, Waleed A. y Essam E. Khalil. "Personal Ventilation and Displacement Ventilation Assessment in Cubicle Workstations". En ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62774.
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Personal ventilation (PV) strategy is increasing very rapidly in ventilating the indoor spaces. Compared to the traditional ventilation system, the use of PV system can provide several advantages such as: energy reduction, comfort and healthy environment. Previous study reported in earlier paper [Schiavon et al. 2010] indicated that the use of PV system may reduce the energy consumption substantially (up to 51%) compared to mixing ventilation. Additionally, healthy environment is assured in the PV system due to the direct supply of fresh “clean” air to the occupant face. In the current study, detailed assessment of PV system and displacement ventilation (DV) system in a cubicle workstation (office cubicle) is presented. This assessment is based on CFD simulations. Five ventilation cases have been studied on the office cubicle. One case is performing a DV system only; another is performing a PV system only; the remaining three cases are performing a combined of PV and DV system. These cases have been evaluated using the PMV and PPD comfort indices, developed by Fanger 1970 and 1982. The target was to achieve a ventilation case that satisfies the best comfort indices near the occupant in the office cubicle. The five cases conditions and the best case conditions are presented in this paper.
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Tehrani, Fleur T. "A New Decision Support System for Mechanical Ventilation". En 2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2007. http://dx.doi.org/10.1109/iembs.2007.4353102.
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Jordan, Stillman y Randall D. Manteufel. "Energy Use Comparison of Air Distribution Systems Serving a Section of a School Building". En ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88718.
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An optimal air distribution design accomplishes both comfort and ventilation requirements while consuming as little energy as possible. This paper analyzes four different air distribution systems and technologies including single duct variable air volume air handlers, chilled beam cooling systems, total energy recovery wheels, displacement ventilation, and dedicated outside air systems; in an effort to determine the best air distribution system for a representative section of a school in hot and humid climate. The effectiveness of the air distribution systems is evaluated by analyzing how the different technologies take advantage of the natural convective properties of air to create a comfortable environment for the occupied region of the space. Distribution effectiveness and energy consumption must be weighed against considerations such as system complexity and ease of operation. This paper compares several alternative air distribution systems to a baseline single inlet VAV system that is commonly used in new schools designed today. Calculations show that the total energy recovery wheels result in a 16% energy savings over the baseline air distribution system because of the large amount of outside air required in school buildings. Chilled beams are not well suited for schools because of the large amount of outside air required by the space and the sophisticated design and operation needed to prevent condensation from occurring at the chilled beam. The results show that the air distribution system that consumes the least amount of energy is a displacement ventilation system. The system also inherently promotes better indoor air quality as it allows air to naturally rise out and return out of the space with minimal mixing of contaminates that may be recirculated within the room for others to breath. The displacement ventilation system’s overall energy savings of 20% over the baseline is mainly attributed to its total energy recovery wheel and the system’s ability to drastically reduce the cooling load seen by the air cooled chiller by effectively ventilating spaces using less outside air.
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Wu, Dicken K. H., Y. F. Lin, Y. F. Pin y Dora W. S. Tsui. "Efficient Numerical Investigation of Ventilation System Design of Road Tunnels". En ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-93124.
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The road tunnel air quality would easily deteriorate if the vehicle-emitted exhaust gas is not properly removed or diluted. As a result, one of the major functions of effective ventilation in road tunnels is to prevent harmful substances from affecting tunnel users and also to maintain good visibility inside for safety consideration. In the present study, a highly efficient three-dimensional computational fluid dynamics (3D CFD) simulation method has been developed and tested to model the traffic induced piston effect in a full scale road tunnel. This method is useful for the design of tunnel ventilation systems.
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Ponnuraj, Balakrishnan, Bijay K. Sultanian, Alessio Novori y Paolo Pecchi. "3D CFD Analysis of an Industrial Gas Turbine Compartment Ventilation System". En ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41672.
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The proper design of the compartment ventilation system is an important requirement in the gas turbine industry. A poor ventilation system not only causes a circumferentially nonuniform casing temperature distribution, but also allows the formation of dangerous gas pockets inside the enclosure. Further, the presence of a circumferential casing temperature gradient has a negative impact on the operational efficiency of the turbine. Keeping the above design objectives in mind, a three-dimensional CFD analysis has been carried out using a leading commercial code to analyze the effectiveness of GE MS5002E ventilation system. A detailed geometric model is developed by including the entire turbine casing, various pipelines, surfaces of inlet and exhaust plenums, roof (with ventilation air inlets and outlet) and walls. Surfaces of all the components in the auxiliary compartment are also captured in the model. For easy meshing, the gas turbine compartment is divided into five regions: 1) inlet plenum and inlet case, 2) compressor, 3) compressor discharge case, 4) HPT and LPT, and 5) exhaust plenum. After meshing, these regions and the auxiliary compartment are combined using arbitray interfaces. A steady incompressible, high Reynolds number k-ε turbulence model is used in the present analysis. Except the casing external surfaces, temperatures are specified on the surfaces of various components, pipes, enclosure inside walls and roof. The casing temperature is determined using conjugate heat transfer modeling in which convective boundary conditions are stipulated on the casing interior surfaces and conduction through casing walls is solved as a part of the CFD solution. Radiation boundary conditions are applied on the casing external surfaces, enclosure walls and roof. Most of the pipes are included in the model. Small regions are modeled as porous media. Buoyancy effects are accounted in the model. The present CFD results will be used in conjunction with prototype testing to optimize the ventilation layout.
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Belleil, Elise, Long Phan, Cheng-Xian Lin, Mirko Schäfer y Johannes Wagner. "Natural Ventilation of a Solar House in Hot and Humid Climate: A Study Using Building Energy Simulation Method". En ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38290.
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The solar powered house at the Engineering Center of Florida International University is out of the U.S. Solar Decathlon 2005 competition. A computational simulation using EnergyPlus is conducted to study different ventilation strategies in this solar house model, with consideration of the hot and humid climate in Miami, Florida. Several modes of ventilation including mechanical cooling systems, natural ventilation utilization, and hybrid systems were considered to seek the best possible option for ventilation in such extreme climate. While the need for a mechanical ventilation system is always present, a resort to natural ventilation could significantly reduce energy consumption. As for natural ventilation utilization, a few methods including earth tubes (ET), thermal chimneys (TC), cooling towers (CT), and openings have been simulated and compared with the mechanical cooling system of the original house. However, as the simulation results suggested, relying on only natural ventilation could cause a dramatic impact to the human thermal comfort. Therefore, a coupling strategy between mechanical systems and natural ventilation was extensively investigated in hope for a better solution in terms of both energy consumption and thermal comfort. In fact, the hybrid system has proved to tremendously reduce energy consumption while complying with the minimum requirements for thermal comfort recommended by ASHRAE standards.
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Quang-Thang Nguyen, Dominique Pastor, Francois Lellouche y Erwan L'Her. "Mechanical ventilation system monitoring: Automatic detection of dynamic hyperinflation and asynchrony". En 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2013. http://dx.doi.org/10.1109/embc.2013.6610722.
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Dojat, Michel y Francois Pachet. "An extendable knowledge-based system for the control of mechanical ventilation". En 1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 1992. http://dx.doi.org/10.1109/iembs.1992.5761308.
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Dojat y Pachet. "An Extendable Knowledge-based System For The Control Of Mechanical Ventilation". En Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 1992. http://dx.doi.org/10.1109/iembs.1992.594650.
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