Search results for "E50"
showing 10 items of 655 documents
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 …
Photovoltaic production for a fixed tilt plane, with different surface azimuth angles. Analyzing system operating conditions and time of day producti…
2019
Master's thesis Renewable Energy ENE500 - University of Agder 2019 Photovoltaicsystems for residential household may bea large part of energy production in the future. The electric grid is facing challenges,andphotovoltaicsystems can contribute in the reduction of electricgrid load by adjustingthe orientation of the photovoltaicpanels.This report investigatestheeffects orientation has on a photovoltaic system, considering;time of dayproduction, operating conditionsand geographical location. Several simulations have been done where these factors wereexanimated. The results presented in this report wereinducedby the use of asimulation toolcalled PVsyst. In this program, a photovoltaic system …
Battery systems for commercial buildings with solar power : Control and operation strategies
2019
Master's thesis Renewable Energy ENE500 - University of Agder 2019 In order to reach the climate targets, a sustainable energy system based on renewable energy generationis required. Battery storage systems are considered part of the solution, aselectricity generationfrom renewable energy sources suchas wind and solardoes not match the energy consumption at all times.This thesis investigates control and operation of battery storage systems for commercial buildings with and without photovoltaicinstallations. It was found in the literaturereviewthat the correct size of a battery system is importantin order to have an optimal storage solution and avoid unnecessary costs. Therefore,a photovolta…
Measurements and analysis of spectral irradiance distributions in southern Norway
2018
Master's thesis Renewable Energy ENE500 - University of Agder 2018 The spectral response of the photovoltaic (PV) cell depends on which technology that is used and the outdoor performance of PV modules depends on solar irradiation, module temperature, and solar spectrum. Therefore, di erent locations should give di erent PV performance outcome. This thesis investigates local spectral irradiance measurements, which will be analysed to document irradiance conditions, and give an indication of which PV technology to prefer in Southern Norway. A spectroradiometer is calibrated for use to measure the spectral irradiance at the University of Agder in Grimstad. From February to April in 2018, spec…
CFD-simuleringer med plasserte hindringer i utløpet til Brokke kraftstasjon for reduksjon av gassovermetning i Otra
2019
Masteroppgave fornybar energi ENE500 - Universitetet i Agder 2019 If air is drawn into the intake system of a power plant, super saturated gas may develop.Super saturated gas can occur if air is dissolved in water under a pressure higher than theatmospheric pressure. Downstream Brokke power plant measurements of super saturatedgas values up to 176% have been reported. It has been shown that super saturated gasover 110% can lead to fish death, and measures should be considered to reduce the totaldissolved gas in Otra.In this study, various measures for reducing super saturated gas in the outlet of Brokkepower station are investigated by using CFD-simulations in Ansys and modeling in Mat-lab.…
Electromagnetic and thermal modelling for prognosis of distribution transformer
2018
Master's thesis Renewable Energy ENE500 - University of Agder 2018 In this thesis numerical modelling of electromagnetics and thermodynamic of a distribution transformer was studied. The model is based on two 5 MVA three phase distribution transformers located in Uleberg (Norway) owned by Agder Energi. The results include magnetic flux density in the core, current density, heat loss density and temperature distribution in the transformer. The maximum temperature of the transformer operating at full load with cooling fans turned on and ambient temperature 20 C, reached the expected value based on temperature measurements from the transformers in Uleberg provided by Agder Energi. The results …
Photovoltaic facade systems in Norway: An assessment of energy performance, building integration, and costs
2018
Master's thesis Renewable Energy ENE500 - University of Agder 2018 In this master thesis, different PV facade systems located in Norway have been evaluated and analyzed. It will thus contribute to the ongoing development of a national database of BIPV. Also, technical and economic aspects of the PV systems are analyzed. Data series from the web-based monitoring systems have been evaluated, cross-sections of the PV facades are examined, and the economic costs associated with the PV systems have been evaluated. The specific yield and cost of the analyzed cases have been compared with simulated data and traditionally clothed facades and with each other. The results showed that the facade PV sy…
Simulating the thermal potential for energy storage in an electric water heater tank
2018
Master's thesis Renewable Energy ENE500 - University of Agder 2018 This thesis uses a CFD model of an electric water heater tank(EWHT) to investigate the strati cation in the tank during di erent discharge experiments. Strati cation in a tank happens naturally as hot water rises to the top and cold water sinks to the bottom, due to the di erence in density of the water based on the temperature. The simulation found that for higher discharges the strati cation becomes better and it is possible to extract more hot water from the tank than at lower discharges. Although the simulation built in this study can simulate all operations of the tank separately, it has not been successful to build a m…
Lifetime Based Health Indicator for Bearings using Convolitional Neural Networks
2019
Master's thesis Renewable Energy ENE500 - University of Agder 2019 Out of all the components in rotating electrical machinery, bearings have the highest failure rate. Bearingdegradation is a seemingly random process which is hard to both model and predict. Countless of con-dition based methods and algorithms have been proposed in order to accurately diagnose incipient faultsand estimate the remaining useful lifetime of bearings. These methods are often complex and hard to im-plement. In this thesis, a data-driven method of estimating a linear lifetime based health indicator (HI)using convolutional neural networks (CNNs) is proposed. The idea behind the method is to train a CNNmodel to recog…
Experimental investigation of the temperature coefficients of Vmpp and Impp in a silicon solar cell
2018
Master's thesis Renewable Energy ENE500 - University of Agder 2019 This thesis is meant to provide an experimental investigation of the temperature coefficient(b)of Vmpp compared to Voc in amulticrystallinesilicon solar cell.With the main question being: to what degree is the temperature coefficient equal for Voc and Vmpp and how does series losses(Rs)affect the two? Also investigating the same question for Isc and Impp. Three types of multicrystalline cells have been measured using a NeonSee AAA sun simulator, for a total of 18 tested cells all produced by Elkem SolarSilicon. I-V data wascollected using temperature scan, Suns-Voc and Isc-Voc measurements, with temperatures reflecting norma…