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The heating system of a building consists of an electric heater placed in the air duct and a 500 Watt fan. The air flows through

The heating system of a building consists of an electric heater placed in the air duct and a 500 Watt fan. The air flows through the duct with a speed of 0.60 kg/sec and its temperature increases by 15 0C. Since there is 250 Watt heat transfer from the air duct to the environment, how many kW is the power of the electric heater? (Ake and Ape will be omitted.)

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