Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 03 Nov 2017 My Price 6.00

coiling Nichrome wire

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 ρe = 10-6 Ω∙m, thermal conductivity k = 25 W/m ∙ K, and emissivity ε = 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.

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?

 

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Maurice Tutor
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Status NEW Posted 03 Nov 2017 07:11 PM My Price 6.00

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