IFE Brage (Institute for Energy Technology)
Not a member yet
997 research outputs found
Sort by
Endogenous soiling rate determination and detection of cleaning events in utility scale PV plants
Get PDFAs the deployment rate of PV power plants continuesto soar, the need for robust, scalable methods for performanceanalytics increases. In this paper, we demonstrate the usefulness ofone approach for quantifying soiling rates in utility-scale PV powerplants endogenously, i.e., directly from the production data. Thetemperature corrected performance ratio, normalized to a cleanstate, is used to derive the soiling ratio (SR). Cleaning events, causedby either rain or manual cleaning, are automatically detected bypositive shifts in the running median of the SR time series. Soilingrates are then estimated by the rate of change of the SR betweenthe cleaning events, which is determined by linear regression. Themethod is validated on data from three utility-scale PV powerplants in the Middle East, yielding soiling rates that are in therange 0%–0.18%/day at least 50% of the time, with a median of 0.1%/day.publishedVersio
Effect of SO2, O2, NO2, and H2O Concentrations on Chemical Reactions and Corrosion of Carbon Steel in Dense Phase CO2
Get PDFsubmittedVersio
McStas and Scatter Logger driven calculations of prompt gamma shielding for neutron guides
Get PDFMcStas ScatterLogger component bundle was adapted for evaluating a contribution to dose rate around neutron guides arising from prompt gamma radiation accompanying neutron capture in the supermirror guide coating upon specular reflection. Thickness of typical shielding materials needed to reduce this contribution to the desired level can be now evaluated directly from running a ray-tracing simulation of the instrument in McStas. An overview of the corresponding modifications to the existing McStas components and description of the newly written supplementary ones is given together with examples and use instructions.publishedVersio
Acid reactions in hub systems consisting of separate non-reactive CO2 transport lines
Get PDFacceptedVersio
Sonochemistry-assisted fabrication of 1D-ZnSb2O6@2D-MoS2 nanostructures: A synergistic energy storage material for supercapacitors
Get PDFsubmittedVersio
Assessment of CO2 storage capacity based on sparse data: Skade Formation
Get PDFLarge North Sea aquifers of high quality are the likely major target for 12 Gt of European CO2 emissions that should be stored in the subsurface by 2050. This involves an upscaling of the present combined injection rate from all European projects, which requires careful examination of the storage feasibility. Many aquifers are closed or semi-closed, with storage capacity mainly constrained by consideration of caprock failure criteria. Because the induced overpressure can propagate to sensitive regions far from the injector, the risk of caprock failure must be examined in terms of large volumes and for long times. This poses challenges with respect to fluid-flow simulation in the presence of highly uncertain aquifer properties. In this work, experts on geology, geophysics, geomechanics and simulation technique collaborate to optimize the use of existing data in an efficient simulation framework. The workflow is applied to the large North Sea Skade Formation, with potential for secondary storage and pressure dissipation in the overlying Utsira Formation. Injection at three locations in Skade gives an overall practical capacity of 1–6 Gt CO2 injected over a 50-year period, depending on the reservoir permeability and compressibility. The capacity is limited by local pressure buildup around wells for the lowest estimated reservoir permeability, and otherwise by regional pressure buildup in shallow zones far from the injection sites. Local deformation of clay due to viscoelastoplastic effects do not have an impact on leakage from the aquifer, but these effects may modify the properties of clay layers within the aquifer, which reduces the risk of lateral compartmentalization. Uplift of the seafloor does not impose constraints on the capacity beyond those set by pressure buildup.publishedVersio
