The resistance wire of a heater is composed of nichrome (a nickel-chromium alloy), completely surrounded by a 1/8 in (k = 0.15 BTU / h ftºF) layer of asbestos, and this in turn, surrounded by another layer of 1/8 in.thick stainless steel (k = 10 BTU / h ftºF). If the core temperature of the wire is kept constant at 1000 F, the convective heat transfer coefficient is 3 BTU / h ft ºF, and the ambient temperature is 70ºF. Calculate: a) The heat flux delivered to the wire in BTU / h ft^2 b) The outside temperature of the wire in ºF

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.