Search results for "500"
showing 10 items of 3244 documents
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…
Planning of Residential Microgrid Community with Technical and Economic Analysis
2018
Master's thesis Renewable Energy ENE500 - University of Agder 2018 Establishment of microgrid communities in Norway can contribute to solve many upgrading challenges of the existing grid. Today's grid are in many areas not suited to handle both bidirec- tional power ow and the increasing consumption from the consumers. With great progress in the development of PV systems, wind turbines and other DG units, is it necessary to establish sustainable solutions to handle the impact this components has on the grid. Since its easier to integrate DG units in microgrids, than in traditional distribution networks, can microgrid be a sustainable solution that is bene cial for both consumers and distrib…
Modelling and simulation of BIPV installations in Norway
2018
Master's thesis Renewable Energy ENE500 - University of Agder 2018 In this thesis, three BIPV-installations has been simulated, the simulated results of each system have been compared to actual production for the real system. The parameters which are assessed in this thesis are production, performance ratio and di erent system losses. The BIPV-installations which are simulated, are Skarpnes, Solsmaragden and Brynseng located in Arendal, Drammen and Oslo respectively. The simulations are done by obtaining weather data, such as global horizontal irradiance and temperature. The weather data was retrieved in di erent ways. PVsyst was used to generate synthetic data, real measured data on site w…
Utilizaion of low temperature waste heat at Eramet Norway Kvinesdal
2020
Master's thesis in Renewable energy (ENE500)
Performance Degradation and Failure Analysis of 7 Years (of) Field Exposed Photovoltaic System in Southern Norway
2018
Master's thesis Renewable Energy ENE500 - University of Agder 2018 This thesis covers an analysis of performance degradation and failure detection of thin-film (Sharp) and m-Si (REC and Suntech) PV modules located at Kjøita in the south of Norway. The analysis consists of performance evaluation, visual inspection, IR imaging and I–V curve measurements. Performance ratios were calculated based on DC data from the past six years. Detection of failures and determination of degradation rates was based on the proposed inspection methods. The results have been analysed to obtain an in-situ overview of the system states concerning degradation and failures. The complementarity between the methods i…
Demand side management of electric water heater with a photovoltaic system
2018
Master's thesis Renewable Energy ENE500 - University of Agder 2018 This thesis presents the development of a load controller, which can be used to store self- produced electricity as hot water in a regular electrical water tank. The electricity market today facing challenges towards grid utilisation and consumption during peak hours. To prevent massive investment for the grid operators for upgrading the grid to handle peak hours, a better utilisation is necessary. An expected increase in electricity prices together with a reduction of cost for renewable energy production opens for new solutions to reduce the grid electricity consumption. The problem statement was to design a controller for …