A student living in a 3.5m x 4m x 2.8m fourth bedroom turns on his 100W fan before leave the room on a summer day. She hopes the room will be cooler when she returns at night. Suppose the door and window are hermetically closed and rule out any heat transfer between the walls and Windows. Determine the temperature in the room when you return 10 hlater. The air in the room is at 100 kPa and 15°C in the morning when it comes out. Answer: 120.78°C

Heat Transfer Question

Problem 8. Energy is generated uniformly in a 20cm thick wall the steady state temperature distribution of the wall is indicated on the table below; z (cm) T (C) 8 10 12 14 16 18 20 0 2 4 6 150 177 205 230 250 272 292 310 330 345 360 If thermal conductivity of the wall is 15 W/m.K and the indicated temperatures are in °C, determine the average rate of heat generation in unit volume.