Gaois

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  1. SCIENCE|natural and applied sciences|physical sciences|thermodynamics

    #620842

    IATE #1153750
    tras-seoladh teirmeach Reference Faomhadh an téarma seo mar chuid de Thionscadal Lex
    ga
    thermal transmittance | heat transmission rate
    en
    Definition rate of transfer of heat through matter Reference "Wikipedia > 'Thermal transmittance' (12.1.2022)"
    Comment "1) The thermal transmittance of a material (such as insulation or concrete) or an assembly (such as a wall or window) is expressed as a U-value2) U-values (sometimes referred to as heat transfer coefficients or thermal transmittances) are used to measure how effective elements of a building's fabric are as insulators. That is, how effective they are at preventing heat from transmitting between the inside and the outside of a building.The U value of an element (in W/(m²K)) can be calculated from sum of the thermal resistances (R-values in m²K/W) of the layers that make up the element plus its inside and outside surface thermal resistances (Ri and Ro).U-value = 1 / (ΣR + Ri + Ro) Where the thermal resistance of the layers of the element R = the thickness of each layer / the thermal conductivity of that layer (its k-value or lambda value (λ) in W/(mK))."