Sökning: "air gaps"

Visar resultat 1 - 5 av 51 avhandlingar innehållade orden air gaps.

  1. 1. Heated air gaps : a possibility to dry out dampness from building constructions

    Författare :Tord af Klintberg; Folke Björk; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Water damage; convection; air gap; building; construction; Building engineering; Byggnadsteknik;

    Sammanfattning : The air gap method is a modification of the common way of building indoor walls and floors. The aim of the method is to make a construction, less fragile to water damage, with air gaps where moisture can be removed with a thermally driven air flow, caused by a heating cable. The thesis includes a number of experimental studies of this method. LÄS MER

  3. 2. Air Gap Method : Air-Gaps in Building Construction to avoid Dampness & Mould

    Författare :Tord af Klintberg; Folke Björk; Kjartan Gudmundsson; Jesper Arfvidsson; KTH; []
    Nyckelord :humidity; air gaps; water damage; convection; building; construction;

    Sammanfattning : .... LÄS MER

  4. 3. Active insulation : possibilities of utilizing free charges in air

    Författare :Mats Sjöberg; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; capacitively coupled discharge; charge accumulation; breakdown mechanism; dielectric covered structures; electric field homogenization; active insulation; dynamic charging; microdischarge; dielectric barrier discharge; dielectric breakdown strength; electric field reduction; space charge; air gaps; surface charge;

    Sammanfattning : .... LÄS MER

  5. 4. Air pollution in Nairobi slums : sources, levels and lay perceptions

    Författare :Kanyiva Muindi; Nawi Ng; Joacim Rocklöv; Elizabeth Kimani-Murage; Marie Thynell; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Air pollution; perceptions; slums; health impacts; Nairobi; Epidemiology; epidemiologi; folkhälsa; Public health;

    Sammanfattning : BackgroundAir quality in Africa has remained a relatively under-researched field. Most of the African population is dependent on biomass for cooking and heating, with most of the combustion happening in low efficiency stoves in unvented kitchens. LÄS MER

  7. 5. Numerical modelling of positive electrical discharges in long air gaps

    Författare :Oscar Diaz; Vernon Cooray; Raul Montano; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; high voltage techniques; numerical modeling; electrical discharge in gases; streamer mechanism; leader channel; Engineering Science with specialization in Atmospheric Discharges; Teknisk fysik med inriktning mot atmosfäriska urladdningar;

    Sammanfattning : This dissertation deals with research on the numerical modelling of electrical discharges in laboratory long air gaps excited with positive switching impulses. It begins with the preliminary work of several scientists during the last decades, making a detailed analysis of different approaches for modelling all the stages in a full discharge. LÄS MER