5-215 Air is to be heated steadily by an 8-kW electric resistance heater as it flows through an insulated duct. If the air enters at 50°C at a rate of 2 kg/s, the exit temperature of air is a) 46.0°C d) 55.4°C b) 50.0°C e) 58.0°C c) 54.0°C | |
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