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 48 for “"HVAC system"”.
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Dynamic performance of control loops and their interactions in a VAV HVAC system
Good HVAC control schemes in buildings help reduce energy use and maintain occupant comfort. During the last 10 years, VAV-HVAC systems are widely used in commercial buildings because they can reduce energy use significantly and provide good temperature control of the conditioned spaces compared to …
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Coupling simulation with machine learning for the development of a proactive HVAC system in the manufacturing sector
… [1]. Following manufacturing processes, the HVAC system is the second largest energy consumer in manufacturing facilities, yet is generally uncounted for and considered an indirect cost to maintain a facility [2]. Any current efforts at reducing energy demand in the manufacturing sector have …
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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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Heating, ventilation, and air conditioning for a superinsulated solar house
… and cooling loads small, requiring a novel HVAC system to provide heating, cooling and ventilation. From the simulated week of occupancy during the competition, where UIUC placed second out of twenty teams, the performance of the HVAC system is analyzed. Using a variable capacity compressor, …
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Impact of Thermally Activated Building Systems (TABS) in Office Buildings
… People control the physical variables using systems that provide heating and cooling to an environment, the earliest of which were found in 9 000-year-old remains from Eastern Turkey (Ma, Wang, & Guo, 2015). The remains consisted of an intermediate space beneath the floor that would have been …
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Dynamic thermal response of buildings resulting from heating and cooling interruptions
… walls on the inside temperature drift after an HVAC system cutoff or a power outage was presented. The inside air temperature response curve is presented for different wall (exterior or interior) constructions of buildings. The effect of insulation position in exterior walls was also shown for …
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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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Architecting IoT-Enabled Smart Building Testbed
… of utilities, efficient operation of building systems, etc. [65]. Hence, modern building owners are turning towards smart buildings. However, the current smart buildings mostly are not capable of achieving the objectives they are designed for and they can improve a lot better [22]. Therefore, a …
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Heating, ventilating and air-conditioning system energy demand coupling with building loads for office buildings.
… Heating, ventilating and air conditioning (HVAC) systems are the largest energy end use in the nondomestic sector, with energy consumption close to 50% of total energy consumption. Different HVAC systems have different energy requirements when responding to the same building heating and …
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Prediction of performance criteria for passive heating ventilation and air conditioning silencers
… 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 power, and pressure drop) associated with a …
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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
… and the circulation that are needed for the HVAC system to work properly. This has an impact on the system’s overall efficiency and results in wasted energy. The work presented here studies the effect of the distance between supply and return air openings at various exit velocities on 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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Thermal and hydraulic analysis of the adsorption bed of the adsorptive thermal battery
… heating, ventilation and air conditioning (HVAC) system with a novel absorbent system of materials and methods is widely investigated. This work focuses on the analysis of the design of such a system to suggest efficiency improvements. The thermal insulation and choice of pump required for …
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Transforming an existing facility into an Energy Plus building
… of the building, replacing an outdated HVAC system with a ground source Geothermal heat pump, implementing a Wi-Fi enabled programmable thermostat to control temperature set points, and installing additional solar panels on the roof. The goal can be achieved by reducing annual energy …
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An exploratory investigation of the facility maintenance program at Sterling Regional High School
… plumbing, heating/ventilation/air conditioning (HVAC), fire alarms, other mechanical, and interior. It was determined that the HVAC system required the most repair time, most return repairs, and was the most costly. Changes were made in the computerized documentation systems and work …
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A fundamental study of two-dimensional room ventilation flows under isothermal and non-isothermal conditions
… 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 a HVAC (Heating Ventilating …
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Improving energy efficiency in a pharmaceutical manufacturing environment -- office building
… Heating, Ventilation and Air Conditioning (HVAC) system was identified as the major energy consumer in both office building and manufacturing building. The step response model of the office indoor temperature to the operating states of the Air Handling Unit (AHU) was developed. Combined with …
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Improving energy efficiency in a pharmaceutical manufacturing environment : analysis of EUI and cooling load
… the Heating, Ventilation and Air-Conditioning (HVAC) system is identified as the major energy consumer in the plant. The AHU operation schedule in the office building is modified to reduce waste while accommodating the working schedule of employees. Motion detection lighting control is …
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Heat pump and photovoltaic systems in residential applications - Performance, potential, and control of the system
Air-source heat pumps coupled with photovoltaic systems are going to be a more and more promising technology, as its widespread application in residential houses will help achieving the decarbonisation of the building sector, which is strongly promoted by the European Union. The aspects that …
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Scenario analysis of retrofit strategies for reducing energy consumption in Norwegian office buildings
… energy consumption were elements of the controls system and the HVAC system. Retrofits to the windows were also beneficial though more costly. Retrofits to the other facade elements and the other energy services system were shown to produce small changes in annual energy consumption for the …
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