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 60 for “"Chiller"”.
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Optimization of multiple chiller systems
… in minimizing the power consumption of multiple chiller systems by determining not only the most efficient combination of chillers in the system but also the optimal operating levels of each chiller making up the combination. The general mathematical formulation for a system of N chillers with …
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Demonstration of HVAC chiller control for power grid frequency regulation
… 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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Economic analysis of solar assisted absorption chiller for a commercial building
… In order to cool the building, the absorption chiller is commonly employed that requires hot water at high temperatures for its operation. This thesis deals with economic analysis of solar collector and absorption cooling system to meet the building loads of a commercial building located in …
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Simulation of 200 ton chiller and response to heat loads in naval applications
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-12-01
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Experimental investigation of factors influencing seasonal performance of water-cooled chiller and heat pump
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-05-01
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Second law analysis and the application of the efficient power criterion to a four-temperature-level absorption chiller
Absorption chillers are a good option for air-conditioning applications and can be operated by low grade energy which makes them environmentally friendly. Common absorption chillers have four main internal components (generator, evaporator, condenser and absorber) and operate between four …
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An integrated system of vapor-compression chiller and absorption heat pump: Experiment, modeling, and energy and economic evaluation
… the separated systems of VCRS, absorption chiller, AHP, and water heater were used to identify the benefits due to the ICASS. The results showed that ICASS consumed the less energy by providing same heating and cooling than the equivalent systems. Finally, building energy simulations were …
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Impact of Ice Storage on Electrical Energy Consumption in Large and Medium-sized Office Buildings in Different Climate Zones
… periods. Ice storage reduces or even eliminates chiller operation during peak periods. The objective of the research is to analyze the chiller energy consumption of conventional non-storage and ice storage cooling systems for large and medium-sized office buildings in diverse climate zones. The …
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Predictive pre-cooling control for low lift radiant cooling using building thermal mass
… to provide low energy cooling by operating a chiller at low pressure ratios more of the time. An LLCS combines variable capacity chillers, hydronic distribution, radiant cooling, thermal energy storage and predictive control to achieve lower condensing temperatures, higher evaporating …
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Design, build-up, and commissioning of R410A chiller facility for experimental investigation into the effect of compressor capacity modulation strategies on seasonal performance
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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Thermoelectric cooling devices: thermodynamic modelling and their application in adsorption cooling cycles
… thermoelectric device, and an electro-adsorption chiller (EAC) such that their performances can be analyzed and understood. Using the thermodynamic modeling and Gibbs law, the temperature-entropy formulations for both the macro and micro-scale solid state cooling devices have been described. The …
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Optimal Design and Operation of A Hybrid Gas/Electric Chilled Water Plant
… plant involves selecting the size and type of chillers to be employed and determining the operating strategy. The types may include both gas engine and electric motor driven chillers. The issues that have to be considered in the selection problem are to incorporate external and internal factors …
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Refurbished and 3D Modeled Thermal Vacuum Chamber
… purpose of this thesis is to incorporate an ATS Chiller system with the HVEC vacuum chamber so students are able to experiment with a thermal vacuum chamber. The ATS Chiller had leaky pipes that needed to be refurbished and a shroud was implemented to improve thermal capabilities of the system. …
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Optimal Allocation of Building Cooling Loads to Chilled Water Plant Equipment
… air is cooled by using cold water provided by a chiller plant consisting of liquid chillers, cooling towers and pumps. To meet the changing demand for cooling, most buildings have automated systems that control the operation of the chilled water plant. The system that controls the chilling …
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STUDYING THE PERFORMANCE OF A QUAD-GENERATION SYSTEM WITH STORAGE FOR IMPROVED ENERGY EFFICIENCY
… a hot water tank, a single-effect absorption chiller, an adsorption chiller, a solid desiccant coated heat exchanger dehumidifier, an indirect evaporative cooler, and a cooling tower constitute the main components of the Quad-generation system. The proposed system is able to produce …
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Energy and first costs analysis of displacement and mixing ventilation systems for U.S. buildings and climates
… system might use more fan energy and less chiller and boiler energy than a mixing ventilation system. The total energy consumption is slightly less with a displacement ventilation system. The displacement ventilation system requires a larger air-handling unit and a smaller chiller than the …
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Modeling and design of a power boosted turbo-compression cooling system
… designed to be a drop-in replacement of electric chiller systems. A case study of a marine diesel generator set and electric chiller is presented, including annual engine loading and seawater temperature profiles. Three TCCS integration options and five working fluids (R134a, R1234ze(E), R1234yf, …
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Software for fault detection in HVAC systems in commercial buildings
… presents a strategy to load multiple centrifugal chillers with a monotonically increasing COP vs. partload ratio curve. The paper also considers the optimization of cooling tower fan operation coupled with the chiller operation. Models for cooling tower performance and chiller performance are used …
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Use of Ultraviolet Light for the Inactivation of Listeria monocytogenes and Lactic Acid Bacteria Species in Recycled Chill Brines
… and lactic acid bacteria in a model brine chiller system. Two concentrations of brines (7.9%w/w or 13.2%w/w) were inoculated with a ~6.0 log10 CFU/ml cocktail of L. monocytogenes or lactic acid bacteria and passed through the ultraviolet (UV) treatment system for 60 minutes. Three …
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