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 29 for “"Ventilation Rate"”.
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Evaluating new ventilation rate and evaporative cooling for modern swine production
Heat and moisture production (HMP) rates of animals are used for calculation of ventilation rate (VR) in animal housing. New swine HMP data revealed considerable differences from previously reported data. This project determined new design VR for swine barn and evaluated differences from previously …
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A NOVEL APPROACH TO NEAR-REAL TIME MONITORING OF VENTILATION RATE AND INDOOR AIR QUALITY IN RESIDENTIAL HOUSES
… (AIM-2), have been used to predict infiltration rate in near real time. These models are constructed from the driving forces of wind and temperature difference across the building enclosure system, both of which cause pressure differences across the enclosure system for infiltration. The models …
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Indoor Concentration Simulation of Radon Isotopes and Their Decay Products
… a function of their outdoor concentration, the rate of emanation from inside, ventilation, deposition, and resuspension. Steady-state and time-dependent equations, derived by Thompson, were used to evaluate the relative effects of these variables on the potential alpha energy concentraiton …
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Determination of particulate emissions from confined animal housing
… range and difficulties in measurement of the ventilation rate of the building. This study seeks to address these issues by looking at the three critical measurements used in determining particulate emissions: total suspended particulates (TSP), particle size and ventilation rate. A new TSP …
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Modeling on single-sided wind-driven natural ventilation
… a significant part of this energy being used for ventilation and cooling. Despite the large amount of energy used in buildings, reports have shown that the indoor air quality (IAQ) and thermal comfort are not satisfactory. The lowered productivity due to the bad IAQ could cause $125 billion loss …
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Volumetric Particle Streak -Tracking Velocimetry and Its Application in Indoor Airflow Measurements
… air distributions at three different levels of ventilation rate for each of two room layouts of an indoor ventilation system. This can be considered as an overall test of the system and the operating method. The airflow fields of the test cases were also simulated numerically using commercial …
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Behavior, welfare, production and bioenergetics of laying hens in alternative housing systems
… system (Chapter 5); and 5) Quantify building ventilation rate (VR) and laying-hen bioenergetics in a fully-open aviary house (Chapter 6).</p> <p>The research described in this dissertation contain the following discoveries: The UHF RFID system was successfully developed and validated. The …
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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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Análise da aerodispersão de contaminantes em laboratórios de pesquisa com biossegurança
… of airborne particle contaminants that are generated within research laboratories with biosafety level. The analysis were conducted using numerical simulations, with the computational fluid dynamics (CFD) technique. Three benchmarks, related to this class of problems, were used for CFD code …
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Rendered rainscreen walls - cavity ventilation, ventilation drying and moisture-induced cladding deformation
… be convectively removed. Under real conditions, ventilation rates in wall cavities are affected by many factors and there is a lack of knowledge regarding both its magnitude and significance for the drying process. Consequently, uncertainties arise during the analysis and moisture safety design …
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Moisture Safety in Wood Frame Buildings - Blind evaluation of the hygrothermal calculation tool WUFI using field measurements and determination of factors affecting the moisture safety
… joints in the interior vapor membrane. The ventilation rate in a cold roof air gap or cold attic must, primarily, be sufficiently high to remove all moisture. However, high ventilation rates decrease the temperature which, in turn, increases the relative humidity and this may cause damage. …
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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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Simulation of weight gain and feed consumption of turkeys
… of the model to variations in R-value, ventilation rate, and feed energy concentration was evaluated. The model was more sensitive to feed energy concentration.
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CO2 body worn logger
… the device. The system can be improved to integrate with other devices as a control system, for instance on the ventilation system, the device can be integrated to regulate the ventilation rate factors based on the current conditions on the area.
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Performance comparison of U.K. low-energy cooling systems by energy simulation
… building, several validation studies demonstrate the accuracy of EnergyPlus and the author's competency as an EnergyPlus user. Systems considered include displacement ventilation, traditional mixing variable air volume ventilation, night cooling, and natural ventilation. Several changes were …
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Modeling contaminant exposure in a single-family house
… a progressively sensitive issue. Mechanical ventilation is a system increasingly implemented to respond to and aid these burgeoning trends to reduce the risk of overexposure to indoor pollutants. In this study, occupational exposure to household contaminants in a single-family house with …
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Cardiac, ventilatory and metabolic responses of two ecologically distinct species of fish to waterborne cyanide
Changes in heart rate, ventilatory activity and oxygen consumption were determined in trout (Salmo gairdneri) and brown bullhead catfish (Ictalurus nebulosus) during exposure to a steadily increasing concentration of waterborne cyanide selected to produce death in 8-9 hours for each species. The …
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Constraining circulation changes through the last deglaciation with deep-sea coral radiocarbon and sedimentary 231Pa/230Th
… cycle changes. The radiocarbon records generated from the Drake Passage corals show increased stratification in the Southern Ocean during the last glacial maximum (LGM) that disappeared during the start of the deglaciation as atmospheric CO2 began to rise during Heinrich Stadial 1 (H1). …
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The behavioural function of pheromones in crayfish
… ventilatory arrest followed by an increase in rate. Both behavioural and physiological responses formed the basis of a novel assay design.During courtship male crayfish do not appear to advertise by urine signals. This raised the question of whether chemical signals were important for female …
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Constraining circulation changes through the last deglaciation with deep-sea coral radiocarbon and sedimentary ²³¹Pa/²³⁰Th
… cycle changes. The radiocarbon records generated from the Drake Passage corals show increased stratification in the Southern Ocean during the last glacial maximum (LGM) that disappeared during the start of the deglaciation as atmospheric CO2 began to rise during Heinrich Stadial 1 (HI). …
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