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 98 kPa and 21°C with a volume flow rate of 135 m3/min. If heat is lost from the air in the duct to the surroundings at a rate of 300 W, determine the exit temperature of air. a.25.667 C b.28.215 C c.35.118 C d.26.597 C

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
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32.)

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 98 kPa and 21°C with a volume flow rate of 135 m3/min. If heat is lost from the air in the duct to the surroundings at a rate of 300 W, determine the exit temperature of air.

a.25.667 C
b.28.215 C
c.35.118 C
d.26.597 C
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