transfers heat

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

transfers heat

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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 10°C, determine how long it will take for the air temperature to rise to 20°C. Assume constant specific heats at room temperature.

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