A 5 cm diameter copper sphere is initially at a uniform temperature of 200C It is suddenly exposed to an environment at 20C having a heat transfer coefficient h 28W m2C Using the lumped capacity method of analysis, calculate the time necessary for the sphere temperature to reach 90C

Question: A 5-cm-diameter copper sphere is initially at a uniform temperature of 200C. It is suddenly exposed to an environment at 20C having a heat-transfer coefficient

A 5-cm-diameter copper sphere is initially at a uniform temperature of 200ºC. It is suddenly exposed to an environment at 20ºC having a heat-transfer coefficient h = 28W/m2·ºC. Using the lumped-capacity method of analysis, calculate the time necessary for the sphere temperature to reach 90ºC.

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