Sökning: "diffusers"

Visar resultat 1 - 5 av 11 avhandlingar innehållade ordet diffusers.

  1. 1. Air diffusion and solid contaminant behaviour in room ventilation : a CFD based integrated approach

    Författare :Gery Einberg; Sture Holmberg; hazim Awbi; KTH; []
    Nyckelord :Technology; CFD modelling; airflow rate; ventilation efficiency; diffusers; solid contaminants; IAQ; TEKNIKVETENSKAP; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : One of the most fundamental human needs is fresh air. It has been estimated that people spend comparatively much time in indoor premises. That creates an elevated need for high-quality ventilation systems in buildings. The ventilation airflow rate is recognised as the main parameter for measuring the indoor air quality. LÄS MER

  3. 2. Analytical and Numerical Investigations of Steady and Unsteady Turbulent Swirling Flow in Diffusers

    Författare :Walter Gyllenram; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; draft tube; diffuser; LES; vortex breakdown; turbulence; CFD; swirling flow;

    Sammanfattning : Swirling flows are found in many technical applications, e.g. turbines, pumps, fans, compressors and combustors. The objective of the present work is to acquire an understanding of the physics of swirling flow in general and unsteady swirling flow in draft tubes of water turbines in particular. LÄS MER

  4. 3. Sensor Fault Detection and Process Monitoring in Water Resource Recovery Facilities

    Författare :Oscar Samuelsson; Bengt Carlsson; Elling W. Jacobsen; Uppsala universitet; []
    Nyckelord :Aeration efficiency; anomaly detection; ammonium feedback control; change detection; covariance matrix; diffuser fouling; experimental design; Gaussian process regression; novelty detection; wastewater treatment;

    Sammanfattning : Water resource recovery facilities (WRRFs) operate 24/7 to reduce the environmental impact from wastewater on receiving waters. Inaccurate measurements hinder the improvement of operations, limits the performance of automatic control, and deteriorate data quality for decision support and other purposes. LÄS MER

  5. 4. Demand Controlled Ventilation (DCV) Systems in Commercial Buildings. Functional Requirements on Systems and Components

    Författare :Mari-Liis Maripuu; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; DCV; CO2-sensors; indoor climate control; energy efficiency; CAV; mixedgas;

    Sammanfattning : Demand controlled ventilation (DCV) is considered as an energy efficient solution forair-based cooling and indoor air quality control. Considerable energy savings can beachieved when the airflow rate is continuously adapted to the actual load condition. LÄS MER

  7. 5. Visualization of Air Flow, Temperature and Concentration Indoors : Whole-field measuring methods and CFD

    Författare :Mathias Cehlin; Mats Sandberg; Alfred Moser; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Environmental engineering; Miljöteknik; Whole-field;

    Sammanfattning : The thermal indoor climate is a complicated combination of a number of physical variables, all of which strongly affect people’s well-being. The indoor climate not only heavily affects people’s health and life quality, but also their productivity and ability to work efficiently. LÄS MER