A 4-m 5-m 7-m room is heated by the radiator of a steam-heating system. The

A 4-m × 5-m × 7-m room is heated by the radiator of a steam-heating system. The steam radiator transfers heat at a rate of 10,000 kJ/h, and a 100-W fan is used to distribute the warm air in the room. The rate of heat loss from the room is estimated to be about 5000 kJ/h. If the initial temperature of the room air is 10oC, determine how long it will take for the air temperature to rise to 20oC. Assume constant specific heats at room temperature.

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5000 kJ/h 4 m x5 m X 7 m 10,000 kJ/h Steam pw FIGURE P4-65