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 248 for “"hvac"”.
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Decentralized HVAC Operations: Novel Sensing Technologies and Control for Human-Aware HVAC Operations
… Heating, Ventilation, and Air-Conditioning (HVAC) HVAC operations. It has been envisioned that development of personal thermal comfort profiles leads to accurate predictions of each occupant's thermal comfort state and such information is employed in context-aware HVAC operations for energy …
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Directional Airflow for HVAC Systems
… of flow. In the building sector however, HVAC systems are usually equipped with stationary diffusors that can only supply the air either in the form of diffusion or with fixed direction to the room in which they have been installed. In the present thesis, the possibility of adopting …
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Creating space for HVAC systems: A new, intuition-building approach to HVAC system integration in architectural education and practice
Heating, Ventilation, and Air Conditioning (HVAC) systems are vital to ensuring a healthy indoor environment in buildings. They are essential to the global shift toward a decarbonized, all-electric future. While integrated design practice has promised cost, energy, and space savings due to earlier …
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Modeling and control of hydronic building HVAC systems
Energy requirements for heating and cooling of residential, commercial and industrial spaces constitute a major fraction of end use energy consumed. Centralized systems such as hydronic networks are becoming increasingly popular to meet those requirements. Energy efficient operation of such systems …
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The link between HVAC type and student achievement
Researchers and practitioners have found that the type of mechanical system utilized to thermally condition a space impacts the noise level for occupants. Indeed, in schools, air conditioning systems are by far the largest contributors to room noise (Bradley, 2002; Nelson et al., 2005; Siebein et …
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Aeolous Innovations: The Sonivent Automated HVAC Heating/Cooling Register
Aeolus Innovations is set to roll out a simple and effective product to help save customers money each month on their heating and cooling bill. Our product, the Sonivent, is an easy to install, easy to use vent that is able to fit in any home air duct. By closing off the vent to an unoccupied room, …
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Dynamic modeling, simulation, and control of transportation HVAC systems
Air Conditioning and Refrigeration (AC&R) systems are ubiquitous in modern society since they perform the key engineering function of transporting thermal energy from one physical location to another. In doing so they are able to change the condition of a defined spatial environment to prescribe a …
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Model based control optimisation of renewable energy based HVAC Systems.
During the last 10 years solar cooling systems attracted more and more interest not only in the research area but also on a private and commercial level. Several demonstration plants have been installed in different European countries and first companies started to commercialise also small scale …
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Indoor biological exposures : what can HVAC filter dust tell us?
… the human and built environment microbiomes. HVAC filters hold promise as long-term, spatially integrated, high volume samplers to characterize the airborne home microbiome. In order to optimize HVAC sampling protocols and improve comparability between studies employing HVAC filters for …
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Performance Evaluation of Control Room HVAC Systems Under Accident Conditions
Made available in DSpace on 2017-07-06T18:42:17Z (GMT). No. of bitstreams: 2 Almerico_Franco_MS.pdf: 153813355 bytes, checksum: 97b0597a0b807af26137319d5d544950 (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1987
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Software for fault detection in HVAC systems in commercial buildings
… of this work include expert rules that adapt to HVAC equipment scale and operation and methods for sorting fault signals according to user-defined interests such as annual cost of energy inefficiencies. These contributions are particularly unique in their treatment of model and the careful …
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Demonstration of HVAC chiller control for power grid frequency regulation
… time intervals of seconds to minutes. Commercial HVAC chillers may be well positioned to provide secondary frequency regulation as a demand side resource. Commercial 200 ton (703 kWth) chillers serving two buildings in the Boston area are used to experimentally develop a practical closed-loop …
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Personalized and Adaptive HVAC Control Strategies in Grid-Interactive Buildings
Efficient control of HVAC (Heating, Ventilation, and Air Conditioning) systems is crucial for balancing demand and supply of energy in buildings, particularly during peak demand pe-riods. This dissertation aims to address three research gaps. First, previous research effortshave focused on …
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Interaction between thermal comfort and HVAC energy consumption in commercial buildings
… in Heating, Ventilating, and Air Conditioning (HVAC) systems and occupants’ thermal comfort in commercial buildings. A numerical model was developed to perform a thermal analysis of a single zone and simultaneously investigate its occupants’ thermal sensations as a non-linear function of the …
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Thermal room modelling adapted to the test of HVAC control systems
… of a model for a room equipped with different HVAC systems. The zonal modelling approach that divides the room air into several sub-volumes is chosen, since it is able to represent the important convective phenomena imposed on the HVAC system. The convective room model is divided into two …
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One-terminal traveling wave-based protection for HVAC and HVDC transmission lines
… transmission line protection methods for HVAC (High Voltage Alternating Current) and HVDC (High Voltage Direct Current) systems. It considers the effect of the sampling frequency on the protection, which until now has not been investigated for one-terminal methods. It addresses …
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Human Inspection Variability in Infrastructure Asset Management: A Focus on HVAC Systems
… in heating, ventilation, and air conditioning (HVAC) and Fire Protection system inspections. Moreover, this study addresses the specific challenge of reducing inspection uncertainty in HVAC systems. HVAC systems play a critical role in facility energy consumption, and their maintenance is vital …
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Development of an automated throw room and HVAC component acoustic test systems
… for the testing of commercial and residential HVAC air delivery components were developed for the UNLV Ventilation and Acoustic Systems Technology (VAST) Lab. One facility, referred to as the HVAC Acoustic Test Facility (HCATS), will be used to measure the acoustic characteristics of in-duct …
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Adaptable, scalable, probabilistic fault detection and diagnostic methods for the HVAC secondary system
… is an increasing need to understand/analyze the HVAC system behavior with the monitoring data. However, the current constraints prevent FDD technology from being widely accepted, which include: 1)Difficult to understand the diagnostic results; 2)FDD methods have strong system dependency and low …
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