Question: A house has an electric heating system that consists of a 300-W fan and an electric resistance heating element placed in a duct. Air flows

A house has an electric heating system that consists of a 300-W fan and an electric resistance heating element placed in a duct. Air flows steadily through the duct at a rate of 0.6 kg/s and experiences a temperature rise of 7°C. The rate of heat loss from the air in the duct is estimated to be 300 W. Determine the power rating of the electric resistance heating element. Answer: 4.22 kW

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