Sökning: "ventilation distribution"

Visar resultat 21 - 25 av 85 avhandlingar innehållade orden ventilation distribution.

  1. 21. Ultrafine Particles in Indoor Air. Measurements and modelling

    Författare :Uve Matson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; airborne particles; aerosols; ventilation; air quality; outdoor air;

    Sammanfattning : Clean air is one of the most fundamental human needs. Since people spen on average over 85% of their time indoors at work, home, school etc., human exposure to air pollution may mostly occur indoors. LÄS MER

  3. 22. Probabilistic Modelling of Air Infiltration and Heat Loss in Low-Rise Buildings

    Författare :Krystyna Pietrzyk; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ventilation; heat loss; reliability; leakage; air infiltration; risk analysis; thermal transmittance; probabilistic model; wind; building physics;

    Sammanfattning : A probabilistic model (PROMO) of air exchange and heat loss in a low-rise building with a lightweight construction is proposed. The probability distributions of the air change rate and of the heat loss are the main outputs of the model. LÄS MER

  4. 23. Investigations of Flow Patterns in Ventilated Rooms Using Particle Image Velocimetry : Applications in a Scaled Room with Rapidly Varying Inflow and over a Wall-Mounted Radiator

    Författare :Amir Sattari; Ivo Martinac; Mats Sandberg; Dirk Müller; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Particle Image Velocimetry PIV ; experimental study; structured light 3D scanning system; ventilation; varying flow rate; room model; wall-mounted radiator; air; water; flow; Particle Image Velocimetry PIV ; experimentell studie; scanningsystem för strukturerat 3D-ljus; ventilation; varierande tilluftsflöde; rumsmodell; väggmonterad radiator; Engineering Mechanics; Teknisk mekanik; Byggvetenskap; Civil and Architectural Engineering; Energy Technology; Energiteknik;

    Sammanfattning : This thesis introduces and describes a new experimental setup for examining the effects of pulsating inflow to a ventilated enclosure. The study aimed to test the hypothesis that a pulsating inflow has potential to improve ventilation quality by reducing the stagnation zones through enhanced mixing. LÄS MER

  5. 24. The Effect of CO2-Pneumoperitoneum on Ventilation Perfusion Distribution of the Lung

    Författare :Christof Strang; Göran Hedenstierna; Suzanne Odeberg-Wernerman; Uppsala universitet; []
    Nyckelord :lung; atelectasis; computed tomography; multiple inert gas elimination technique; model; pig; Pa–ECO2 ratio; surgery; laparoscopy; lung; blood flow; single photon emission computed tomography; ventilation perfusion distribution; gas exchange; hypoxic pulmonary vasoconstriction; MEDICINE; MEDICIN;

    Sammanfattning : Laparoscopic operations are a common and popular way for abdominal procedures. They are usually performed by insufflation of carbon dioxide (CO2) into the abdominal cavity. However, insufflation of CO2 may interfere with cardiac and circulatory as well as respiratory functions. The CO2-pneumoperitoneum (PP) may cause hypercarbia and acidosis. LÄS MER

  7. 25. The air distribution in buildings with combined natural and mechanical ventilation

    Författare :Gunnar Åhlander; KTH; []
    Nyckelord :;

    Sammanfattning : This work describes result from both measurements on anumber of one family houses, an analytical study of a one-zonemodel and multi zone studies of a two storey building. Thesimulations are performed as both parametric studies, withcombined values of outside temperature, wind velocity and winddirection, and whole year simulations. LÄS MER