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Finding the temperature of a wire
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Apr22-14, 09:46 PM
OK. So there would be an area of ~ 1' x 6" of wire laid out on a snowmobile face shield. The length of the wire would be 10 ft, and the resistance would be 0.6348 ohms per foot. You would be using a 9 volt battery, so the current would be about 1.4 amps (how long will the battery charge last with this current?). The heating rate would be about 13 W, or about 0.1 W/inch. Since the spacing of the wires is 1", each square inch of heated surface receives a heating rate of 0.1 W, or, the surface heating rate is 0.1 W/in2. This is an area-average heating rate of about 50 BTU/hr ft2. Does this make sense so far?
If it is a snowmobile face shield, I'm assuming that the long direction of the heated area is vertical, and the short direction of the the heated area is horizontal. Correct? The 20 mph air flow hits the face shield head-on, correct? The face shield is not perfectly flat? It is curved around the face, correct? The air flows around the curved face shield?
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