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 27 for “"chilled water"”.
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Optimal Allocation of Building Cooling Loads to Chilled Water Plant Equipment
… Typically, the 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 …
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Optimal Design and Operation of A Hybrid Gas/Electric Chilled Water Plant
The design of a chilled water 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 …
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The effect of inlet conditions and tank geometry on the thermal performance of stratified chilled water storage
… demand charges on consumption during peak hours. Chilled water storage has emerged as one of the simplest and most effective methods for shifting on-peak cooling loads to off-peak hours. With estimates of the electricity consumed by space cooling at nearly 50% of the summer peak, chilled water …
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Cooling system design tool for rapid development and analysis of chilled water systems aboard U.S. Navy surface ships
… to study the heat transfer process within the chilled water system and the auxiliary seawater system and develop a Cooling System Design Tool (CSDT) based on the thermodynamic laws that govern heat transfer as well as the hydrodynamic principles that govern fluid flow, specifically the …
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Cooling system early-stage design tool for naval applications
… and Criteria Manualfor Surface Ship Freshwater Systems and other references to create a Cooling System Design Tool (CSDT). With the development of new radars and combat system equipment on warships comes the increased demand for the means to remove the heat generated by these power-hungry …
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Potential energy cost savings by use of building roofs as thermal storage of a multi-storied building
… slabs embedded with pipes carrying hot or chilled water to meet the heating or cooling load, respectively. The water temperature drops across the coils and the frequency and intensity of room air circulation can be varied, along with controlling the gains through the windows, to shift the …
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Flow fields and heat transfer of liquid falling film on horizontal cylinders
… produce is cooled directly by spraying it with chilled water, the process is known as hydrocooling. Other similar systems, is achieved by formulating the equations that govern heat transfer on the scale of the pieces of horticultural produce, and the spaces between them.
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Simulation and Analysis of Energy Consumption for Two Complex and Energy intensive Buildings on UMD Campus
… 1.19%, and 5.27% for electricity, steam, and chilled water. ERC model results deviated respectively 0.47%, 5.3%, and 2.2% from annual electricity, hot water, and gas. Four energy efficiency measures for the Physcial Sciences Complex provided energy model predicted energy savings of 3,757 MMBtu …
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A Combined Energy–Exergy Approach for Improving Refrigeration Systems in Deep-Level Gold Mines: Method Development and Case Study Validation
… is the refrigeration system, which supplies chilled water for cooling the underground working environment. Due to the outdated nature of these systems, and their fixed supply capacities, they are prone to energy wastage through inefficient operation. Previous studies have suggested energy- or …
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Improving energy efficiency in a pharmaceutical manufacturing environment -- office building
… usage can be reduced by 10,868 kWh/year and chilled water consumption can be reduced by 79,403 kWh/year. Motion detection lighting control could also result in estimated savings of 54,082 kWh/year.
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Improving energy efficiency in a pharmaceutical manufacturing environment : analysis of EUI and cooling load
… setting and the set point temperature of chilled water and off coil air.
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Modeling and control of hydronic building HVAC systems
… feedback control schemes using a simulated chilled water system as a case study. The advantages and limitations associated with these methodologies has been demonstrated. The cornerstone of this work is the development of a novel, distributed predictive scheme which provides the best …
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Potential energy savings on the MIT campus
… the consumption of electricity, steam, and chilled water could be decreased by approximately 17% and save the Institute $350,000 a year in utility costs.
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Energy, power, and office buildings : design and analysis of an off-peak cooling system using structural mass storage
… ceiling slab cooled at night with imbedded chilled water pipes and taking full advantage of off-peak electrical rates. The ceiling/slab - waterpipe system is modeled via two-dimensional finite difference methods for transient analysis. The sensitivity of the system to pipe size and spacing, …
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Modeling of Distributed Naval Ship Systems using Architecture Flow Optimization
… of commodity flow (electric, mechanical, chilled water, etc.), which is calculated in post-processing; 2) AFO is applied to a large and complex naval surface combatant system of systems, demonstrating its scalability; 3) data necessary for the AFO is extracted directly from a naval ship …
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Development of a Model and Optimal Control Strategy for the Cal Poly Central Plant and Thermal Energy Storage System
… a calibrated model of the Cal Poly Central Chilled Water Plant with Thermal Energy Storage for use in determining an optimal operating control strategy. The model was developed using a transient systems simulation program (TRNSYS) that includes plant performance and manufacturer data for the …
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Analysis and characterization of ancillary service demand response strategies for variable air volume HVAC systems
… supply air temperature adjustment (STA), and chilled water temperature adjustment (CWA). Simulations were run over ranges of implementation and cooling load intensities and the results were used to create characteristic curves for each strategy, which map performance in terms of system power …
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Demonstration of HVAC chiller control for power grid frequency regulation
… to the chiller and adjusts power through chilled water setpoint. In the second setup, both the chiller and air handling units are controlled through the BAS. Demonstrations using standard electric system operator test routines show the chiller power response to exceed qualification …
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Integrated System Architecture Development and Analysis Framework Applied to a District Cooling System
… chiller model developed using Modelica produces chilled water below 6.6 degrees Celsius, which satisfies the system requirement for the district chiller system captured in the SysML tool. Similarly, many such requirement verification capabilities using dynamic simulation integration with the …
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