Two water columns are at different temperatures, one being at 35°C and the other being at 18oC. The water columns are separated by a glass wall of area Im by 2m and a thickness of 0.005m. Calculate the amount of heat transfer. (Thermal Conductivity of glass is 1.6 W/mK) TABLE 13-13 Typical values of resistance for common building materials R for thickness shown, m K/W Building material R, m K/W Building board Kypoum, 9.5 mm particle board Building membrane 2 layers, 0.73 kg/m° felt 0.056 7.35 0.21 Glass single glazing, 3 mm double glazing. 6 mm air space triple glazing, 6 mm air space 0.16 0.32 047 Insulating material Blanket and batt mineral fiber from glass, approx. 90 mm approx. 150 mm approx. 230 mm approx. 275 mm glass fiber, organic bonded loose fill milled paper spray applied polyurethane foam 2.29 3.32 5.34 6.77 27.7 23 40 Roofing asphalt shingles buil-up, 10 mm 0.077 0.058 Masonry brick 1.15 concrete 0.6 Siding materials hardboard, 11 mm 0.12 0.10 plywood, 9.5 mm Aluminum or steel, over sheathing. bollow-backed insulating board backed, 9.5 mm insulating board backed, 9.5 mm, foil 0.11 0.32 0.52 Soils 0.44 Still air, 90 mm 0.4 Socie of esti Retii d Condienin

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.