its surroundings at 50°C and 100 kPa during this process. Determine (a) the amount of heat transfer and (b) the exergy destruction associated with this process.

A 70-lbm copper block initially at 220°F is dropped into an insulated tank that contains 1.2 ft3 of water at 65°F. Determine the work potential wasted during this process. Assume the surroundings to be at 65°F.

Carbon steel balls (ρ = 7833 kg/m3 and cp = 0.465 kJ/ kg·°C) 8 mm in diameter are annealed by heating them first to 900°C in a furnace and then allowing them to cool slowly to 100°C in ambient air at 35°C. If 1200 balls are to be annealed per hour, determine the rate of exergy destruction due to heat loss from the balls to the air.

An ideal gas of mass 10 kg undergoes a process from an initial state of 4 m3/kg and 47°C to afinal state of 0.6 m3/kg and 127°C. Assuming the surroundings to be at the dead state,determine the increase in the useful work potential of the gas during this process.