3. A house has a composite wall of wood, fiberglass insulation, and plasterboard, as indicated in the sketch. On a cold winter day, the convection heat transfer coefficients are ho-60 W/mK and h=30 W/mK. The total wall surface area is 350 m. Find the k values buy using the average inside and outside temperatures in literature and/or posted property tables on the e-class. Glass fiber blanket (28 kg/m), k Plaster board, kp -Plywood siding, ks Inside hi, Too, i = 20C 111 10 mm 100 mm- Lp Lb Outside ho, Too,= -15C 111 -20 mm L$ (a) Determine a symbolic expression for the total thermal resistance of the wall, including inside and outside convection effects for the prescribed conditions. b. Determine the total heat loss through the wall. c. If the wind were blowing violently, raising ho to 300 W/mK, determine the percentage increase in the heat loss. d. What is the controlling resistance that determines the amount of heat flow through the wall?