Carbon-steel balls (Ï = 7833 kg/m3 and cp = 0.465 kJ/kg°C) 8 mm in diameter are annealed

Carbon-steel balls (ρ = 7833 kg/m3 and cp = 0.465 kJ/kgˆ™°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 2500 balls are to be annealed per hour, determine
(a) The rate of heat transfer from the balls to the air and
(b) The rate of entropy generation due to heat loss from the balls to the air.

Transcribed Image Text:

Air, 35°C Furnace Steel ball 900 C 100°C