Sökning: "Total Pressure Losses"

Visar resultat 1 - 5 av 20 avhandlingar innehållade orden Total Pressure Losses.

  1. 1. Numerical Studies of Flow and AssociatedLosses in the Exhaust Port of a Diesel Engine

    Författare :Yue Wang; Laszlo Fuchs; Mihai Mihaescu; Angelo Onorati; KTH; []
    Nyckelord :Internal Combustion Engine; Exhaust flow; Exhaust Valve; Exhaust Port; Large Eddy Simulation; Valve and Piston Motion; Total Pressure Losses; Energy Losses; Discharge coefficient; Flow Losses; Flow structures; Air Flow Bench; Engine-like Conditions; SRA - Energy; SRA - Energi;

    Sammanfattning : In the last decades, the focus of internal combustion engine development has moved towards more efficient and less pollutant engines. In a Diesel engine, approximately 30-40% of the energy provided by combustion is lost through the exhaust gases. The exhaust gases are hot and therefore rich of energy. LÄS MER

  2. 2. Air flows in building components

    Författare :Johnny Kronvall; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; air flow; air movement; building component; fluctuating pressure; leakage; pressurization; permeability; porosity; surface roughness; entrance; bend; exit pressure loss; pressure drop; infiltration; convection;

    Sammanfattning : This work deals with different aspects of air movements in building components . The investigation shows to what degree the concept of fluid mechanics can be applied to problems concerning air flows in building Components. The applicable parts of fluid mechanics are presented as thoroughly as possible. LÄS MER

  3. 3. Experimental Study on Truck Related Power Losses: The Churning Losses in a Transmission Model and Active Flow Control at an A-pillar of Generic Truck Cabin Model

    Författare :Erwin Adi Hartono; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hot wire anemometry; Machine learning; Computational Fluid Dynamics; A-Pillar; Transmission; Flow separation; Churning losses; CFD; Gearbox; Torque measurement; Particle Image Velocimetry; Smoothed Particle Hydrodynamics.; Active Flow Control; SPH; Curve fit; Synthetic Jets; Load independent power losses; Aeration; Flow visu- alization;

    Sammanfattning : The fight with global warming constantly forces vehicle manufacturers to innovate, in order to be able to reduce the CO2 emissions of their product. This means that marginal efficiency gains in every component are considered beneficial for total reduction of CO2 emissions. LÄS MER

  4. 4. Behovsstyrd ventilation i lokalbyggnader-Innebörd och strömningstekniska konsekvenser

    Författare :Andreas Karlsson; Chalmers University of Technology; []
    Nyckelord :duct systems; energy efficiency flow mechanics; DCV; energy; pressure; ventilation; control-on-demand; demand controlled ventilation;

    Sammanfattning : In todays society energy efficiency and energy savings are becoming increasingly important. The building sector represents a major part of Swedens total use of energy. Furthermore, ventilation constitutes the single largest factor in the energy balance of buildings. LÄS MER

  5. 5. Ventilation System Design - A Fluid Dynamical Study with Focus on Demand Control

    Författare :Andreas Karlsson; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; variable airflows; pressure level; ventilation system design; HVAC design; variable air volume; pressure loss; VAV; demand control ventilation;

    Sammanfattning : Ventilation corresponds to a large part of the total energy use of a building and a lot of attention has been paid to how to reduce this energy use. However, much of this work on saving energy has been focused on reduction of the airflows and how this in turn reduces the energy use. LÄS MER