2. In winter, indoor ambient temperature is 8C. An elderly turned on an electric heater at home. He switched the heater to 40C in living room and went to bedroom for a nap. The wall between living room and bedroom is built by brick covered by 102mm brick and 12.5mm plaster board on both side of the brick (thermal conductivity is 0.77 W/m-K and 0.21 W/m.K). Evaluate the following: a. Overall heat transfer coefficient from electric heater to the bedroom, given that convection heat transfer coefficient (h) is 20 W/m2.K b. Overall heat transfer per unit area from electric heater to the bedroom