Labels:text | screenshot | display | font | line | parallel | number | diagram | rectangle OCR: Thermal Conductivity FF 18 K-value W.m / m2.º℃ (BTU/Hr).in/ft2.ºF : (constant) R-value: 1/K 1/K =1/K 65 U-value W / m2.ºC ( BTU/Hr)/ft2.ºF : = K/t t + Thickness Thickness *.*.*.*... ...... *.*.*.*.*.*... :R-value 1/U meters inches = 1/U Heat Exchange W (Watts) : Heat Exchange BTU/Hr : W =- . m2.ºC = U .m2.º℃ K . ft2.ºF = U . ft2 . ºF m BTU/Hr= in Where K (Conductivity Factor) is constant for each material ( not related to thickness), U (Convection Coefficient) varies inversely with the thickness for the same mean temp R (Resistance Factor) is simply the inverse of Kor U.
.iso/HyperCard/Education/Weights & Measures/card_9851_render.png){kind=small}