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 25 for “"air distribution"”.
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Non-Iterative Technique for Balancing an Air Distribution System
Balancing an air distribution system consists primarily of measuring airflow and adjusting volume control devices to get specified airflow. Flow calculation methods are not accurate enough to ensure proper balancing by duct design alone. To assure proper balancing, dampers within an air …
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Quantifying Air Distribution, Ventilation Effectiveness and Airborne Pollutant Transport in an Aircraft Cabin Mockup
… during flight inspired this research into cabin air quality, which is closely related to its airflow distribution, ventilation effectiveness and airborne pollutant transport. The experimental facility is a full-scale aircraft cabin mockup. A volumetric particle tracking velocimetry (VPTV) …
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Green building technologies : should a developer implement photovoltaics, underfloor air distribution, and natural ventilation?
… Three green building technologies, underfloor air distribution, photovoltaics, and natural ventilation, are examined in detail to determine if they are financially feasible for a developer to include in a commercial real estate office project. This thesis attempts to use a financial argument, …
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The Effects of Diffuser Exit Velocity and Distance Between Supply and Return Apertures on the Efficiency of an Air Distribution System in an Office Space
<p>The distance between supply air diffusers and return air grilles is an important design parameter that has not been properly investigated. Sometimes, design and installation constraints force the engineer or the contractor to place the return duct close to the supply duct which can have a huge …
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On-site testing of crop drying fans
… designed, built and calibrated for on-site fan airflow and energy measurements. Four-, six-, and eight-trailer peanut dryers were tested for performance. The characteristics observed were delivery of fan airflow as compared to manufacturers' ratings, air distribution to each of the trailer …
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A fundamental study of two-dimensional room ventilation flows under isothermal and non-isothermal conditions
Understanding room air distribution is essential to the design of a ventilation system and the control of room thermal and air quality conditions. To investigate the various aspects of room air distribution, a Room Ventilation Simulator was developed with several unique features: an outer room with …
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A Study of Thermal Comfort and Cost Effectiveness of Stratum Ventilation
… need for studying thermal comfort with various air distribution strategies becomes a significant issue recently due to climate change, increasing energy prices and the governmental energy efficiency policy. Stratum ventilation, with air supplied at breathing level, can probably provide …
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Fuel/air Mixing and Nitrogen Oxide Formation in a Lean Premixed Gas Turbine Combustor
… of reactant unmixedness based on the fuel/air distribution measurements recorded during the non-reacting mixing studies.
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Airflow Analysis in Mechanically Ventilated Obstructed Rooms
… typical room flowrates and inlet types the room air distribution system is obstruction ratio independent. Local velocities and standard deviations varied with each obstruction setup and inlet combination. However, average air velocities and turbulence intensities were not influenced by …
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Design of a wind-powered cooling system for an apple storage facility
… characteristics. The requirements of the air distribution system are discussed, and the pressure drop calculations are shown in connection with the circulating fan selection. The overall system operation is discussed, including control system requirements.
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INDOOR AIR QUALITY AND ENERGY IMPLICATIONS IN THE USE OF VRV SYSTEM FOR OFFICE BUILDING
… this work was to evaluate the impact of indoor air quality and energy implication on the usage of variable refrigeration volume (VRV) in the low-rise office environment. Two offices equipped with the VRV installation and employing two different modes of fresh air supply were selected for this …
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Projeto térmico de trocadores de calor resfriados a ar
… industries, are increasing the use of the air cooled heat exchangers. Exchangers designing usualy utilize the estimate and global methods. This paper shows these methods and presents a new approach for this design, called "stepping method'', which consider the tube bundle divided in small …
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Effect of conical distributors on evaporator and system performance
… study to experimentally examine effects of the distribution of refrigerant and air in the evaporator using a conical distributor on system COP and capacity. Several conditions at the distributor inlet are varied including quality, mass flux, and orientation in gravity and the resulting superheat …
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Effects of indoor air quality on the occupant's health and productivity in an office building
Indoor Air Quality (IAQ) is an important parameter in deciding the status of Sick Bulding Syndrome (SBS). Poor IAQ which leads to SBS can result in adverse effect on the health of the occupant which causing lower productivity. This study was conducted to establish correlation between IAQ and …
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Improving the indoor air quality (IAQ) through application of the air cleaning technologies for offices building simulated in environmental chamber
Indoor air quality (IAQ) is very important issue in residential and commercial buildings, because human spend almost 90% of their life indoor. IAQ problems effect on the health of the occupants, and lead to reduction of the efficiency and output in workplaces. The main objective of this study is to …
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Ventilation impact on indoor air quality problems in partitioned offices
Complaints of many indoor air quality problems occur in partitioned offices. Ventilation is one way to control the contaminant distribution and to provide better indoor air quality within the office. A comprehensive research of the ventilation impact on indoor air quality problems in partitioned …
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Some Aspects of the Performance of Rotating Fluidized Beds
… for the distributor plate, plenum chamber and air distribution systems. Three rotating bed devices were designed and built, namely a perspex model purely to investigate fluidization properties at ambient temperature and two combustors. The combustors were used to extend the range of ambient …
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New turbulence models for indoor airflow simulation
… healthy indoor spaces. Heating, Ventilating and Air Conditioning (HVAC) design engineers and architects widely use the Computational Fluid Dynamics (CFD) technique for indoor environment predictions. The CFD technique requires a turbulence model to correctly calculate indoor air distribution. …
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Simplified methodology for indoor environment designs
… uses averaged single parameters such as air velocity, air temperature or contaminant concentration. This approach gives only general information about thermal comfort and indoor air quality, which is limiting for the design of energy efficient and healthy buildings. The design of these …
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Soft pneumatic devices for blood circulation improvement
… actuators, as well as the pneumatic circuits and air distribution system and PLC control patterns will be outlined. The trial run of the devices have been field--‐tested as soon a prototype was ready, so as to tune its features step--‐by--‐ step. I am also giving a characterization of a commercial …
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