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 47 for “"Water heater"”.
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Improvements on performance of a heat pump water heater system
Heat Pump Water Heater (HPWH) is classified as one renewable energy efficient technology, which could be explained by their environmentally friendly nature with low energy consumption. The Coefficient of Performance (COP) of the HPWH can be influenced by multiple factors: ambient temperature, …
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Load Frequency Control for Electric Water Heater Using DBSCAN Algorithm in real-time
… a novel control strategy for residential water heaters to provide demand-side frequency regulation while maintaining customer comfort. The approach employs Density-Based Spatial Clustering of Applications with Noise (DBSCAN) algorithm to dynamically group water heaters based on their …
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Transient distribution of refrigerant and oil in a residential heat pump water heater system
… and oil distribution in a residential heat pump water heater (HPWH) system. In the experiments, R134a is used to pair with POE 22 oil as the working fluid. Quick Closing Valve Technique (QCVT) is employed to localize refrigerant and oil into each component of the system. Remove and Weigh …
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Development of a performance-based high pressure feed water heater model for Flownex SE
Feed-water heaters (FWHs) are an integral part of the power plant with respect to the overall heat recovery, and thus its efficiency. While the main purpose of the FWHs is to heat up the feed-water before being sent to the boiler, there are more added advantages owing to the installation of this …
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An assessment of financial incentives for encouraging South Africa's domestic solar water heater market
SA has a demand for domestic hot water, which is supplied by a number of different technologies. For a number of reasons, including health reasons and versatility, Government has encouraged the demand for electricity to meet domestic requirements. But currently there is a shortage of electricity …
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Design and implementation of a 6 kW wind powered water heater controller with PI control
… has been made. Solar energy is widely used for water or space heating while wind is used for pumping water for remote areas. This project looks into the design and development of a 6kW wind powered water heating unit.
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Comparison of measured to predicted performance of owner-built solar integral collector storage water heater systems
… integral collector storage (ICS) passive solar water heater systems installed at various geographic locations in Virginia to predicted values calculated using Annual Performance Methodology (APM). APM is a prediction method developed by Alan Zollner that offers quick and easy comparisons of …
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A quasi-steady modeling approach of a heat pump water heater system with experimental validation and analysis
In a heat pump water heater system, the dynamic interdependence between the vapor compression system and the water in the storage tank poses a modeling challenge for steady-state refrigeration system models. The aim of this project is to develop a model and methodology for coupling steady-state …
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Impact of Premise Plumbing Conditions, Materials, Corrosion Control, Temperature, and Water Heater System Design on the Growth of Opportunistic Pathogens in Drinking Water
As waterborne disease originating in potable water plumbing systems (such as Legionnaires' Disease and Nontuberculous Mycobacterial (NTM) infections) continue to increase, it is important to better understand the cause(s), responsible parties and interventions to prevent disease. This dissertation …
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Taming the green bull in the regulatory china shop how insufficient understanding of governance and power resulted in the Solar Water Heater Bylaw in the City of Cape Town not being implemented
… particular case: the unsuccessful draft Solar Water Heater By-law in the City of Cape Town. The case is framed by the question why the by-law initiative did not take off. The choce behind this initiative was informed by the hope that the answer would help in understanding climate change …
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Integration of gas instantaneous auxiliaries with renewable energy residential water heaters
Gas instantaneous water heaters are increasingly used as auxiliary energy sources for renewable energy domestic hot water systems. Currently the gas used by these systems is measured and modelled only very approximately. Accurately assessing consumption is important as gas can supply up to 50% of …
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Holistic Building Technology Selection for Sustainability: A Market Analysis and Multi-Attribute Decision Making Approach for Residential Water Heaters in U.S.
Water heating in the United States has the largest energy consumption of any residential related use. It uses more energy than all other home appliances combined. They have also been implicated as the source of waterborne disease outbreaks. With such high stakes, it is recommended that a Decision …
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Possibilities of pre-heating water with the heat obtained by cooling milk in a wet-tank milk cooler
… cooler may be used for preheating a quantity of water. 2) The amount of water heated and the temperature to which it is heated are functions of the heat obtainable from the milk cooler and refrigeration equipment. 3) The percentage of available heat from the condenser that is available in the …
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Analysis of the Impact of Solar Thermal Water Heaters on the Electrical Distribution Load
In this research, the impact of solar thermal water heaters on the electric water heating load curve in a residential distribution circuit is analyzed with realistic hot water draw profiles. For this purpose, the electric and solar thermal water heater models are developed in MATLAB and validated …
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Methylobacterium spp.: Emerging Opportunistic Premise Plumbing Pathogens
… for many infections linked to drinking water. The annual cost of disease caused by these waterborne pathogens is $850 million. Key characteristics of these opportunistic waterborne pathogens include: disinfectant- resistant, biofilm formation, thermal-tolerance, desiccation-resistant, …
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Effect of Water Chemistry, Pipe Material, Temperature and Flow on the Building Plumbing Microbiome and Opportunistic Pathogen Occurrence
… the relative contributions of influent water quality, provided by drinking water utilities, and those of building-level features, such as pipe materials. To this end, standardized pipe rigs were deployed at the treatment plants and in distal portions of the water distribution system at …
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A consumer assessment of household attitudes, awareness, drivers and likelihood of installing solar water heaters under a monthly payment scheme in Cape Town, South Africa
… reviews how incentive mechanisms impact solar water heater (SWH) technology adoption under both monthly payment scheme (MPS) and non-monthly payment scheme (non-MPS) conditions. The key research problem is to try understand why consumers1 have not installed SWHs under non-MPS conditions and …
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A Novel Temperature Control Method for Electrode Type Ohmic Water Heaters
… rise model for an Ohmic type electrode water heater, that regulates temperature by adjusting the electrode separation. The type and amount of dissolved solids and temperature, determine the electrical conductivity of the water, which limits the instantaneous power of Ohmic type heaters. …
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A Framework for Controlling Opportunistic Pathogens in Premise Plumbing Considerate of Disinfectant Concentration x Time (CT) and Shifts in Microbial Growth Phase
… leading cause of disease associated with potable water in the U.S. and many other countries. While secondary disinfectant is added by utilities prior to water distribution through pipes, the residual in water at the property line is sometimes insufficient to suppress OP growth. Conditions …
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Simulation of a solar water heating system
A computer simulation model of a domestic solar water heater, using natural circulation, is presented here. Tests were conducted on an experimental system, using a flat plate collector and solar storage tank, auxiliary to an electric geyser. Temperatures were recorded, solar radiation was measured …
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