The electric heating systems used in many houses consist of a simple duct with resistance heaters....

 

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The electric heating systems used in many houses consist of a simple duct with resistance heaters. Air is heated as it flows over resistance wires. Consider a 15-kW electric heating system. Air enters the heating section at 100 kPa and 17°C with a volume flow rate of 150 m/min. If heat is lost from the air in the duct to the surroundings at a rate of 200 W, determine the exit temperature of air. Assume the air has constant specific heats. ėout = 200 W T2= ? W ein T = 17°C P = 100 kPa 15 kW Ú, = 150 m/min The electric heating systems used in many houses consist of a simple duct with resistance heaters. Air is heated as it flows over resistance wires. Consider a 15-kW electric heating system. Air enters the heating section at 100 kPa and 17°C with a volume flow rate of 150 m/min. If heat is lost from the air in the duct to the surroundings at a rate of 200 W, determine the exit temperature of air. Assume the air has constant specific heats. ėout = 200 W T2= ? W ein T = 17°C P = 100 kPa 15 kW Ú, = 150 m/min