Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 54 for “"Ventilation systems."”.
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Design strategies for residential ventilation systems
In the literature on ventilation, residential ventilation systems have traditionally received less attention due to their relatively low capacity and complexity. Nevertheless, the large energy saving potential of the residential building sector has made it one of the key targets of climate change …
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Optimization of control device locations and sizes in mine ventilation systems
… methodology for solving the semi-controlled ventilation network problem. After analysis and consideration of the objective and legal, technical and operation convenience factors, the semi-controlled network problem is formulated through a nonlinear nonconvex programming model. Using the …
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A systematic heat recovery approach for designing integrated heating, cooling, and ventilation systems for greenhouses
… ciblant spécifiquement la chaleur perdue par la ventilation, notre objectif est d'identifier des moyens efficaces et innovants pour exploiter cette source d'énergie abondante mais souvent négligée. Cette thèse a pour principal objectif de présenter une méthodologie systématique offrant des …
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Development of a remote analysis method for underground ventilation systems using tracer gas and CFD
… remotely and quickly ascertaining the ventilation status is one of the pieces of essential information that can help mine personnel and rescue teams make decisions. This study developed a methodology that uses tracer gas techniques and CFD modeling to analyze underground mine …
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Energy and first costs analysis of displacement and mixing ventilation systems for U.S. buildings and climates
In the past two decades, displacement ventilation has been increasingly used in Scandinavia and Western Europe to improve indoor air quality and to save energy. By using a detailed computer simulation method, this study compared the energy consumption of a displacement ventilation system with that …
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Transition dynamics between the multiple steady states in natural ventilation systems : from theories to applications in optimal controls
… in numerical and experimental studies in natural ventilation systems. The-oretical models are developed and their applications in numerical simulations and ventilation controls are presented. In a system with multiple steady states, how the system reaches different steady states is determined by …
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Assessing surface and underground cooling methods, coupled to efficient ventilation systems to improve the climatic conditions in deep and hot mines
… mines. Cold air is primarily achieved by ventilation up to a critical depth from where further cooling must be provided by cooling systems, which can either be located on the surface or underground. Three major strategies that can be applied when it comes to cooling the air: centralized …
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Determination of a novel mine tracer gas and development of a methodology for sampling and analysis of multiple mine tracer gases for characterization of ventilation systems
Ventilation in underground mines is vital to creating a safe working environment. Though there have been numerous improvements in mine ventilation, it is still difficult to ascertain data on the state of the ventilation system following a disaster in which ventilation controls have been potentially …
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Air - for Health and Comfort, An Analysis of HVAC Systems' Performance in Theory and Practice
… of the objective is to analyze how different ventilation systems perform in practice when it comes to supplying and exhausting designed air flow in different outdoor and indoor conditions. The other part is to analyze the design criterias and the energy use of a variable air volume system …
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A detailed justification for the selection of a novel mine tracer gas and development of protocols for GC-ECD analysis of SPME sampling in static and turbulent conditions for assessment of underground mine ventilation systems
… of assessing air quantity in underground mine ventilation circuits. The execution of a tracer gas style ventilation survey allows for the direct measurement of air quantity in locations where this information is otherwise unattainable. Such instances include inaccessible regions of the mine or …
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Impact of ventilation system operation and building products on perceived indoor air quality
Currently, the ventilation rate in non-industrial buildings is determined per human occupant regardless of the pollutant emissions from building materials, ventilation systems and other sources. With the intention of saving energy, the ventilation systems in many office buildings are turned off …
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ParaSITE
paraSITE proposes the appropriation of exterior ventilation systems on existing architecture to inflate pneumatic shelters that are designed for homeless people. This project involves the production of a series of inflatable prototypes, the distribution of these devices to a group of homeless …
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Numerical study of the thermal performance of solar chimneys for ventilation in buildings
Building ventilation is crucial for improving the indoor air quality and thermal comfort. Nowadays, mechanical ventilation systems such as air conditioning and fans are most commonly used in buildings. However, these devices consume a lot of electricity which is mainly generated from the combustion …
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Floor-supply displacement ventilation system
… 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 well. The system …
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Calculation of smoke ventilation in building fires including atriums
… design of buildings, a reliable method of smoke ventilation is the single most important instrument. Nowadays, the design of novel types of atrium in new buildings is very popular, thus the aim of the current research work is to evaluate methodologies that define guidelines as to the design of …
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Human error contribution to nuclear materials-handling events
… on fuel movement activities and control of ventilation systems, which could significantly impact worker and public health and safety in the case of a fuel-handling accident.
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Unbalanced Exchange Flow
Understanding the natural ventilation of buildings induced by the force of buoyancy is crucial if we are to design ventilation systems that provide the ventilation flow rates required to maintain comfortable and healthy internal conditions while using little energy. This thesis considers exchange …
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Sustainability and residential development : a guide to cost-efficient green building technologies
… technologies- geothermal heating, heat recovery ventilation, triple-pane windows and a range of insulation materials. Considering all of these options, an interactive computer code was designed to take in inputs from the user about their home, calculate the energy needs of the home, and optimize …
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The effects of stocking density and housing on feed efficiency and growth performance of broiler chickens
… and feed efficiency in poultry farming. Natural ventilation systems, which control airflow and temperature, are common in small-scale productions, while mechanical ventilation systems require efficient fans. The choice of housing system and design significantly impacts the welfare and …
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