Search results for "ENE500"
showing 10 items of 69 documents
Effect of substrate improvement on optimising biogas yield from anaerobic digestion
2014
Masteroppgave i fornybar energi ENE 500 Universitetet i Agder 2014 The anaerobic digestion process involves the decomposition of the organic matter to yield biogas; gas that is mainly composed of methane and carbon dioxide with traces of some other gases. This process is used for different purposes including municipal waste treatment, wastewater treatment, fertilizer production, and farm wastes disposal as well as energy production. It is accomplished in three main stages; hydrolysis, acidogenesis and methanogenesis with each of the stages achieved by specific microorganisms that are active in limited ranges of operational and environmental conditions. These conditions are controlled to ach…
Chemical Vapour Deposition of Pure Titanium Using a Heated Wire Reactor and TiI4
2017
Master's thesis Renewable Energy ENE500 - University of Agder 2017 An experimental reactor system has been optimized throughout a series of experiments for making titanium tubes from an electrically heated titanium coil filament by a chemical vapour deposition method, based on the original van Arkel-de Boer -process. The titanium is thermally decomposed on the filament from vapourized titanium tetraiodide in a method not seen in similar experiments. The small-scale reactor is built for this purpose, and the associated systems and methods are developed to maintain the optimal conditions for a continuous metal deposition. A filament current control system is made of an Arduino micro-controlle…
Comparison of ideal solar cell concepts using infield data
2018
Master's thesis Renewable Energy ENE500 - University of Agder 2018 The work done in this thesis has been focused on the comparison of the power production in the ideal single junction cell, intermediate band solar cell, the unconstrained tandem cell, and the area de-coupled 2-terminal constrained tandem cell, using di erent band gaps. The efficiency and production for each of the concepts have been calculated based mathematical framework previously established, using temperature and irradiation data collected from Kjøita in Kristiansand, using MatLab. The monthly and annual power production for each of the concepts has been calculated and compared. It has been found that the intermediate ba…
Smart Electric Vehicle Charging System : Controlling Multiple Electrical Vehicle Chargers using OCPP to Limit Electricity Demand
2017
Master's thesis Renewable Energy ENE500 - University of Agder 2017 Peak demand is a problem when Electrical Vehicle charging is introduced in the electricity grid. Local limitations like fuses and transformer capacity can rapidly be overloaded if multiple Electrical Vehicles are charging at the same time. This can be solved by shifting these loads in time. This master’s Thesis presents a solution by using the communication protocol OCPP to restrict one or more chargers below a set demand limit. The solution is developed in cooperation with Sharebox [1] and Grønn Kontakt [2], and is in prototype phase at the end of this Master’s Thesis. Testing demonstrates that the prototype can reduce the …
Optimization of Charging Stations on a Route with Electric Buses
2019
Master's thesis Renewable Energy ENE500 - University of Agder 2019 This studyconsiders placement of electric charging stations for a public electric bus system with the intention of minimizing the charging power. This is an optimization problem where fully electric buses with opportunity charging strategy are considered.The developed strategies are proposed for an existing bus route in Oslo city, Norway. Batteryand chargingspecifications were determinedbased on a literature review. Measurements regarding velocity of the bus and altitude of the route were performed. This data where further used to determine the energy needsfor an electric bus. Four cases were formedregarding different batter…
Design and verification of a solar powered automatic rooftop hydroponic system with real time individual measuring of potassium and calcium
2019
Master's thesis Renewable Energy ENE500 - University of Agder 2019 This report covers development and implementation of two hydroponic systems. One at a lab inside theUniversity of Agder, and one at the roof on the J-Building at the University. This report tries to answer thefollowing main research question: How can an automated system for control of nutrient concentration andpH in a solar powered hydroponic system be developed, implemented and verified?The focus of the report has been to create a fully functional system for the lab, generating data forelectronic conductivity for measuring a specter of nutrients, pH value, individual nutrients and temperaturefor comparison. The work has bee…
An approach to day ahead forecasting of solar irradiance with an application to energy gain in solar thermal collectors
2014
Masteroppgave i fornybar energi ENE 500 Universitetet i Agder 2014 Today, for the management of energy supply systems forecast information on load and theproduction of meteorology dependent (wind, solar, hydro) generation is ever rising. Solarirradiance forecasting is given a unique priority as it spans over major applications such asmanagement of grids with a high share of photovoltaic generation and thermal power supplysystems relying on solar heat generation. This thesis will address the day ahead prediction of thelocal irradiances intended to be applied for the management of solar assistant systems for heat andhot water supply. The forecast method presented here is based on the statisti…
Measurements of magnetic flux density in rotating machines : development of a calibrated and portable measurement system
2014
Masteroppgave i fornybar energi ENE 500 Universitetet i Agder 2014 Diagnostics of generator poles has traditionally been done by measuring the impedancein each pole and assume that the magnetic ux density is proportional to the impedance.With Hall-sensors it is possible to measure the actual magnetic ux density in each poledirectly. It is also possible to measure the ux density while the machine is runningwhich is not possible with impedance tests. In this project a complete system for makingmeasurements with Hall-sensors has been developed and tested on three generators. Twoof the generators were hydropower generators of 50 and 90 MVA. The measurementsystem is comprised of hall-sensors, po…
Sensorless Control of Induction Motors Using an Extended Kalman Filter and Linear Quadratic Tracking
2017
Master's thesis Renewable Energy ENE500 - University of Agder 2017 Conventional sensorless controls for induction motors require two PID regulators and precise gain turning. This thesis presents a sensorless control for induction motors using an extended Kalman filter (EKF) and linear quadratic tracking (LQT). The proposed method requires only a single controller and no physical velocity sensor
Waste heat utilization for central heating and ventilation systems at Chassix Norway
2018
Master's thesis Renewable Energy ENE500 - University of Agder 2018 Chassix from south of Norway attempt to reduce their energy demand by sending waste heat to a Central Heating System, (CHS), named Case 1. The CHS heat the ventilation systems, space heat and water heating. The waste heat used is from the Sand Recycling Process, (SRP), and the Aluminum Cooling Process, (ACP). The ACP and a 600kW cooling tower are installed in May/June. Since the CHS is close to the ventilation systems using Battery Heat Exchanger, BHE, a possibility for utilizing the ventilation systems as a cooling tower, named Case 2. Case 2 is an attempt to reduce investment cost by replacing investment cost for installin…