Search for dissertations about: "efficiency model"
Showing result 1 - 5 of
1977 swedish dissertations containing the words efficiency model.
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Author : Anders Goude; Olov Ågren; Carlos Simão Ferreira; Uppsala universitet; []
Keywords : Wind power; Marine current power; Vertical axis turbine; Wind farm; Channel flow; Simulations; Vortex model; Streamtube model; Control system; Graphics processing unit; CUDA; Fast multipole method; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;
Abstract :
Two computationally fast fluid mechanical models for vertical axis turbines are the streamtube and the vortex model. The streamtube model is the fastest, allowing three-dimensional modeling of the turbine, but lacks a proper time-dependent description of the flow through the turbine. READ MORE
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Author : Haiying Cao; Chalmers tekniska högskola; []
Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; dynamic load modulation; Behavioral model; digital predistortion; I Q imbalance; Volterra series; efficiency; power amplifier; transmitter;
Abstract :
In recent years, reducing energy consumption in wirelesscommunication systems has gained prominence. In order to achieve this energy saving, high power efficiency is necessary for the wireless transmitters used. READ MORE
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Author : Jesper Persson; Chalmers tekniska högskola; []
Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; performance; environmental science; efficiency; numerical modeling; design; hydraulics; pond; wetland; tracer study; preference;
Abstract :
Today there is a growing interest in constructed ponds to treat agricultural runoff, sewage water and stormwater. But ponds not only remove nitrogen, phosphorus and pollutants such as heavy metals; they can also have ecological, social and esthetic values. READ MORE
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Author : Mikael Klingvall; Göran Ahrne; Fredrik Liljeros; Felix Reed-Tsochas; Stockholms universitet; []
Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; organizational development; social influence; organizational culture; institutional development; adaptability; agent-based model; Sociology; Sociologi; Sociology; sociologi;
Abstract :
Organizations, once established, tend not to change, typically going obsolete as society continues to evolve. This makes adaptability an important issue. Organizational members must make sense to each other, or coordination suffers. READ MORE
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Author : Christian Brembilla; Thomas Olofsson; Ronny Östin; Mohsen Soleimani-Mohseni; Bjørn Reidar Sørensen; Umeå universitet; []
Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Efficiency factors of space heating; hydronic panel radiator; hydronic floor heating; multilayer wall; numerical modelling; room control volume; decrement factor; time delay; heat conduction; heat convection; heat radiation; heat storage; thermal inertia; Euler solver; Newton-Raphson method; synthetic weather file; feedback and feed-forward control strategies; adaptive control; validation methodology; uncertainty bands; robustness of model predictions; thermostatic booth simulator; differential sensitivity analysis; transient model of panel radiator with multiple storage elements; active thermal mass; benchmark performance indicator; linear regression model; calibration through uncertainty bands; hybrid model of low-energy building: law driven data driven; outdoor temperature compensation heating curve; solar radiation model; finite difference method; heat equation;
Abstract :
The thesis focuses on the efficiency of the space heating system. In particular, the efficiency factors measure the efficiency of thermal zone. The efficiency factors measures how the energy is used in a space heating. READ MORE
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