Essays about: "merra"

Found 5 essays containing the word merra.

  1. 1. INVESTIGATION OF POTENTIAL REASONS TO ACCOUNT FOR THE UNDERPERFORMANCE OF AN OPERATIONAL WIND FARM

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Renas Tücer; [2016]
    Keywords : Wind Resource Assessment; Advanced Energy Estimations; Wind Farm Underperformance; Overestimation of the Energy Yield; WindSim; WindPro; WAsP; Wind Energy; Wind Site Engineering.;

    Abstract : Wind farms are costly projects and prior to the construction, comprehensive wind resource assessment processes are carried out in order to predict the future energy yield with a reliable accuracy. These estimations are made to constitute a basis for the financial assessment of the project. READ MORE

  3. 2. NAO Index: An Extreme Pressure Approach

    University essay from Uppsala universitet/Luft-, vatten- och landskapslära

    Author : Patrik Boström; [2014]
    Keywords : North Atlantic Oscillation;

    Abstract : The North Atlantic Oscillation (NAO) is the major mode of atmospheric winter variability over the North Atlantic. Its current state has long been described by the station‐based NAO Index. This index has been shown to represent winter temperature anomalies over Northern Europe well. READ MORE

  4. 3. Meteorological Investigation of Preconditions for Extreme-Scale Wind Turbines in Scandinavia

    University essay from Uppsala universitet/Luft-, vatten- och landskapslära

    Author : Christoffer Hallgren; [2013]
    Keywords : extreme-scale wind turbines; wind power; wind power density; wind atlas; MERRA; reanalysis data; extremskaliga vindkraftverk; vindkraft; vindenergidensitet; vindatlas; MERRA; återanalysdata;

    Abstract : During the last three decades, the hub height of wind turbines has increased from 24 to 162 meters and with an increasing demand for break-through innovations in green energy production it seems likely that this trend will continue. The meteorological preconditions for extreme-scale wind turbines are investigated for Scandinavia using 33 years of reanalysis data from MERRA (Modern-Era Retrospective Analysis for Research and Applications). READ MORE

  5. 4. Uncertainty Analysis of Long Term Correction Methods for Annual Average Winds

    University essay from Institutionen för fysik

    Author : Rickard Klinkert; [2012]
    Keywords : Uncertainty; Long-term-correction; Measure-Correlate-Predict; Sector-Bin; Synthetic time series; Reference dataset; Weather observation stations; WRF; MERRA; QuikSCAT; NCEP FNL; Bootstrap; sampling; North Sea.; Osäkerhet; Measure-Correlate-Predict; årsmedelvind; Sektor-Bin; Syntetiska tidsserier; referensdataset; väderobservationsstationer; WRF; MERRA; QuikSCAT; NCEP FNL; Bootstrap; sampling; Nordsjön.;

    Abstract : For the construction of a wind farm, one needs to assess the wind resources of the considered site location. Using reference time series from numerical weather prediction models, global assimilation databases or observations close to the area considered, the on-site measured wind speeds and wind directions are corrected in order to represent the actual long-term wind conditions. READ MORE

  6. 5. Wind Turbine Production losses in Cold Climate : case study of ten wind farms in Sweden

    University essay from Institutionen för kultur, energi och miljö

    Author : Jon Malmsten; [2011]
    Keywords : Icing of wind turbines; production losses; cold climate; reanalysis data; Vindkraft;

    Abstract : As wind power expands rapidly worldwide, it is becoming more common to build wind farms in alpine locations where the wind resources often are good and conflicting interests are few. This is evident in Sweden where a substantial portion of the large wind parks planned are to be built in cold climate locations. READ MORE