73 uppsatser · sida 3 av 5
? En utredning med fokus på spänningsvariationer och osymmetri inom landsbygds- och tätortsnät vid en- och trefasanslutning av solcellsanläggningar
… One of the main reasons for voltage variations is the reversed power flow that migrates "upwards" in the grid when the PV-systems produce and sell their excess to the grid. The reason for unbalance in the low voltage network is mainly loads or production with uneven distribution …
… of the outputs were calculated. It was found that the stormwater- and baseflow were most sensitive to perturbations in the perciptation. Unceartainty analysis using Monte Carlo simulation was performed in two different ways. (1) All model parametres and inputs were included with …
… computational dynamics software FLUENT, six simulations of laminar, stationary flow of a fluid that was assumed to be Newtonian were performed. The mass flow rate across the model outlet boundaries was varied for the different simulations to produce a basis for a parameter …
… of about 10-30 km2, focus has been set on calculating the transport of water flow from different hydrological response units. Regardless of the processes occurring in the soil after the water has been added, it is assumed that all the water which flows from each simulated unit …
… hot rolling. The project is modeled in a computer environment in which the air flow in the furnace and the heat transfer to the aluminium solids are included. The computer environment and its governing equations, as well as boundary conditions and generalizations, are presented …
… ställda krav. Valet föll på att genomföra flödesanalyser i SolidWorks Flow simulation. För att ha något att jämföra mot utfördes fysiska mätningar på BEV-heatern i Calix ABs testlabb. Med hjälp av mätning från testlabbet samt utförda beräkningar kunde vi jämföra mot …
… designed in several different ways, both regarding the heatsink design and the flow direction. In simulation, flow with the inlet centered above the heatsink result in considerably lower pressure drop and slightly higher temperatures than flow through the block, for heatsinks …
… be in terms of energy usage and capacity when comparing two sets of traffic flows in such an environment. One set of traffic flow was symbolized by self-driving cars, and one set was composed by conventional vehicles. With the settings and conditions defining the simulations in …
En analys av energianvändning och kapacitet
… be in terms of energy usage and capacity when comparing two sets of traffic flows in such an environment. One set of traffic flow was symbolized by self-driving cars, and one set was composed by conventional vehicles. With the settings and conditions defining the simulations in …
… at high load and low engine speeds. At high engine speeds the increase in flow losses affects the performance in a negative way for the D-EGR-system. At low load the intake pressure may exceed the exhaust pressure, which makes it unbeneficial to do a part of the exhaust stroke …
… With modifications or by adding additional regulating parameters such as water flow into the controller, the functionality can be improved. The result from the survey shows that during the experimental period the residents experienced a minor impact on the thermal comfort …
Fallstudie: Intunnling av E4/E20 Tomteboda - Haga södra
… focus should be on having the network behave as expected according to traffic flow theory and that evaluation and analysis should be done as comparisons between scenarios. This implies that the model does not properly represent reality and that the results thus not can be …
En numerisk analys av den ringformade koaxiala borrhålsvärmeväxlaren
… with the annular CBHE. This means that the annular CBHE acts like a counter-flow heat exchanger which is thermally optimal. In total, the simulation result shows that the annular CBHE geometry in this thesis can increase a system's seasonal performance factor (SPF) with 10-19 % …
… to propel the rotation of the drill string. The model shows the pressure and flow variations that occur due to the geometry of the motor. Simple models of the rock and drill steel were developed to simulate the entire rock drill. Those models were also validated with test …
… handling system that can independently make their own decisions regarding flow paths and traffic control. An AGV-system consists of transport units carrying cargo from point A to point B, and communicates using a computer. The purpose of this study is to develop a model on how …
