An air heater may be fabricated by coiling Nichrome wire
Chapter , Problem 3.86(choose chapter or problem)
An air heater may be fabricated by coiling Nichrome wire and passing air in cross flow over the wire. Consider a heater fabricated from wire of diameter D 1 mm, electrical resistivity e 106 m, thermal conductivity k 25 W/m K, and emissivity 0.20. The heater is designed to deliver air at a temperature of T 50 C under flow conditions that provide a convection coefficient of h 250 W/m2 K for the wire. The temperature of the housing that encloses the wire and through which the air flows is Tsur 50 C. If the maximum allowable temperature of the wire is Tmax 1200 C, what is the maximum allowable electric current I? If the maximum available voltage is E 110 V, what is the corresponding length L of wire that may be used in the heater and the power rating of the heater? Hint: In your solution, assume negligible temperature variations within the wire, but after obtaining the desired results, assess the validity of this assumption.
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