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 20 for “"Heating, ventilation, and air conditioning (HVAC) systems"”.
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Diagnostics in Heating Ventilation and Air Conditioning (HVAC) Systems Using a Rule - Based System
Made available in DSpace on 2017-07-06T18:48:40Z (GMT). No. of bitstreams: 3 Huffer_Jason_E_MS.pdf: 108923499 bytes, checksum: 7598e8c1dda5e1140205024a946c302c (MD5) Huffer_Jason_E_MS_ABS.pdf: 488205 bytes, checksum: 0aa43d14872ee7d9e46c91b8c5d20bee (MD5) license.txt: 4813 bytes, checksum: …
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Meta-modeling and Optimization of Computational Fluid Dynamics (CFD) analysis in thermal comfort for energy-efficient Chilled Beams-based Heating, Ventilation and Air-Conditioning (HVAC) systems
With the rapid rise in the use of air conditioning systems and technological advancements, there is an ever-increasing need for optimizing the HVAC systems for energy efficiency while maintaining adequate occupant thermal comfort. HVAC systems in buildings alone contribute to almost 15% of the …
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Business reasons for utilizing renewable energy applications in facilities to assist in extending the life of the heating ventilation and air conditioning systems
… in buildings to help extend the life of the heating, ventilation and air conditioning (HVAC) systems. It is designed to focus on gleaning information from the United States and China. These two countries differ politically, socially, economically and culturally. In history, trading and other …
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Prediction of performance criteria for passive heating ventilation and air conditioning silencers
Unwanted noise is generated by the operation of heating, ventilation, and air conditioning (HVAC) systems in large buildings. The unwanted noise can be reduced by installing a passive silencer in the HVAC system. The ability to predict the performance criteria (insertion loss, regenerated sound …
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Applied change of mean detection techniques for HVAC fault detection and diagnosis and power monitoring
… used with a second application, fault detection and diagnosis in building heating ventilation and air-conditioning (HVAC) systems. The method developed here analyzes the transient behavior of HVAC sensors to define conditions of correct operation of a computer simulated constant air volume HVAC …
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Data-driven models to evaluate root causes of energy performance gaps in office buildings
… building designs with efficient envelopes, and Heating, Ventilation and Air Conditioning (HVAC) systems utilizing energy modeling tools with forecasted occupancy, plug load, and operational profiles as inputs. Their expected performance is often not met due to discrepancies between modeled …
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Shipboard Fault Detection, Marine Micro-Grid Power Diagnostics and Vessel Ventilation Monitoring
… based maintenance, fault detection & diagnostics and energy scorekeeping through numerous installations on various Navy and Coast Guard vessels throughout the last several decades. Using equipment power transients to identify particular equipment operation, and tracking these transients enables a …
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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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Fault Detection for Systems with Multiple Unknown Modes and Similar Units
… fault detection for large-scale practical systems with many nearly identical units operating in a shared environment. A special class of hybrid system model is introduced to describe such multi-unit systems, and a general approach for estimation and change detection is proposed. A novel …
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MODELLING CRYSTALLIZATION FOULING IN LIQUID-TO-AIR MEMBRANE ENERGY EXCHANGERS
… water from an aqueous solution. Liquid-to-air membrane energy exchangers (LAMEEs) use membranes to control humidity and temperature in heating, ventilation and air-conditioning (HVAC) systems. A semi-permeable hydrophobic membrane is used in LAMEEs to separate an air stream from an aqueous …
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Dynamic Modeling and Model-Free Real-Time Optimization for Cold Climate Heat Pump Systems
Air source heat pump (ASHP) has been a well-received technology to provide space and/or water heating for building and industrial applications, while its efficiency and heating capacity can be severely limited when operated in cold climate. Various modifications have been proposed for cold-climate …
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An innovative fault analysis framework to enhance building operations
… review was conducted for fault modeling and the fault mode and effect analysis (FMEA) applications to the building technology with a conclusion that few FMEA studies were applied in the building Heating, Ventilation, and Air-Conditioning (HVAC) systems. This study aims to fill this gap by …
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Numerical modelling of geothermal borehole heat exchanger systems
… efficiency in buildings, in particular their heating, ventilation, and air conditioning (HVAC) systems, a policy objective for reducing energy consumption and CO2 emissions nationally and internationally. Ground source heat pump (GSHP) systems, due to their high coefficient of performance …
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Advanced Occupancy Measurement Using Sensor Fusion
… of the energy used in buildings attributed to Heating, Ventilation, and Air conditioning (HVAC) systems, there is clearly great potential for energy saving through improved building operations. Accurate knowledge of localised and real-time occupancy numbers can have compelling control …
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Thermal comfort assessment of primary school children in a warm and humid climate : a case study of Imo State, Nigeria
… climate change is likely impacting the comfort and the health of building occupants, especially in a primary school setting where young children engage in-class lessons for an extended period. This thesis presents the results of the perception of the thermal environment by primary school …
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An Intelligent Virtual Design Studio (vds) For Integrative Design Of Green Buildings
… a software platform for integrated, coordinated and optimized design of green building systems with low energy consumption, high indoor environmental quality (IEQ), and high level of sustainability. My dissertation research was focused on the development of a key VDS component -- an integrated …
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An Intelligent Virtual Design Studio (VDS) for Integrative Design of Green Buildings
… a software platform for integrated, coordinated and optimized design of green building systems with low energy consumption, high indoor environmental quality (IEQ), and high level of sustainability. My dissertation research was focused on the development of a key VDS component -- an integrated …
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Impact of Thermally Activated Building Systems (TABS) in Office Buildings
… Mean Vote (PMV), a model consisting of physical and personal variables to quantify a person's thermal comfort within a building. The physical variables include air temperature, relative humidity, mean radiant temperature, and air velocity, and the personal variables include activity level and …
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Power electronics implementation of dynamic thermal storage as effective inertia in large energy systems
Modern large energy systems such as electricity grids and electrified transportation encounter increasing processed power in multi-physics domains, such as electrical, mechanical, thermal, and chemical. Although many systems are becoming predominantly electrical dependent, an integrated …