The thermal conductivity of a sheet of rigid, extruded insulation is reported to be k = 0.029 W/m·K. The measured temperature difference across a 25-mm-thick sheet of the material is T| – T2 = 10°C. (a) What is the heat flux through a 3 m x 3 m sheet of the insulation, in W/m2? (b) What is the rate of heat transfer through the sheet of insulation, in W? (c) What is the thermal resistance of the sheet due to conduction, in K/W?

A temperature difference of 85oC exists across a fibreglass insulation layer 13 cm thick, for which k = 0.035 W/mK. Calculate the heat transferred through the fibreglass per hour per unit area.

A 1,155 ft², 4 in. thick concrete wall has inside and outside surface temperatures of 24°C and 4°C. A 2 in. insulation batt with a thermal conductivity of k= 0.03 Btu/(h. ft. °F) is added to the wall. Determine the reduction in heat transfer rate. What is the thickness of the insulation in meters? 0.0508 x Your response differs from the correct answer by more than 10%. Double check your calculations. m What is the thermal conductivity value of the insulation batt in W/(m. K)? 0.05188 W/(mK) What is the R-value of the concrete wall (in m². K/W)? 0.022578 X Your response differs from the correct answer by more than 10%. Double check your calculations. m². K/W What is the R-value of the insulation batt (in m² K/W)? 1.9584 X Your response differs from the correct answer by more than 100%. m² K/W What is the heat transfer rate (in W) when the insulation is added? X W What is the percent reduction in the heat transfer rate? 96 x %

There is a 1.20-cm-thick stagnant air pocket. A) What thickness of cork would have the same R-factor as the stagnant air pocket? The thermal conductivity of air is 0.0230 W/m·K and of cork is 0.0460 W/m·K.in cm  B) What thickness of tin would be required for the same R-factor as a 1.20-cm-thick stagnant air pocket? The thermal conductivity of air is 0.0230 W/m·K and of tin is 66.8 W/m·K . in m i asked how to do this but got the wrong soloution