A house has a composite wall of wood, fiberglass insulation, and plaster board, as indicated in the sketch. On a cold winter day the convection heat transfer coefficients are ho 60 W/m2 K and hi 30 W/m2 K. The total wall surface area is 350 m2. (a)Determine the total heat loss through the wall. (b) lf the wind were blowing violently, raising ho to 300 W/m2 K, determine the percentage increase in the heat loss. Glass fiber blanket (28 kg/m3), k, Plaster board, k,- -Plywood siding, k̟ Inside Outside h, T= 20°C h, T = -15°C 0o, o 11 10 mm –100 mm- 20 mm

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Strain energy

The term strain indicates the variation in an object's length, area, and volume when the object is subjected to an external force. The external force may be of normal, shear, moment, torque, etc. The strain in an object depends on the types of external force and cross-section of the object. Mathematically, the evaluation of strain can be obtained with the help of elastic constants.