A wall is constructed of two layers of 2-cm-thick sheetrock (k =0.17 W/m·K) separated by 16 cm by wood studs (k = 0.11 W/m·K) whosewidth is 5 cm. The studs are placed vertically 55 cm apart, and thespace between them is filled with stagnant air (16 by 55 cm) asinsulation (k = 0.026 W/m·K). Pay attention to themeasurements!
The house is maintained at 20°C and the ambient temperatureoutside is ?9°C. Taking the heat transfer coefficients at the innerand outer surfaces of the house to be 8.3 and 34 W/m2·K,respectively, determine the thermal resistance of the wallin C/W considering arepresentative section (1m x0.60 m) of the wall to three significant digits. That isfrom stud end to the other stud end...so a single stud in yoursection..see plan view below and an example to the right withoutthe sheetrock.
