1. If the air conditioner in the previous problem is turned off, how fast does the house heat up in K/s?
2. A disk brake of 2 kg steel and 1 kg brake pads is at 20?C. The brakes are now stopping a car, so they dissipate energy by friction and heat up to T2 = 200?C. Assume the brake pads have specific heat of 0.6 kJ/kg-K. After this process, the disk and pads now slowly cool to the ambient, 20?C=T3. Find the exergy destruction in the braking process (1 to 2) and in the cooling process (2 to 3).