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 01 Apr 2018 My Price 6.00

lectrical resistivity

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
(5)
Status NEW Posted 01 Apr 2018 07:04 PM My Price 6.00

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