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Question

The total heat transfer from a spherical copper ball of diameter 15 cm initially at 220 °C, and its environment at a constant temperature of 25°C and convection coefficient h = 100 W/m2K, during the first 20 min of cooling is calculated to be 2400 kJ. Assuming the properties of the copper to be k = 400 W/mK, ρ = 8933 kg/m3 and cp = 385 J/kgK. This result is

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Solution

qmax=mcp(TiT)

=8933×43π(0.075)3×0.385×(22025)

=1185 kJ

qcalculated>qmaxResult is not possible

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