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Engineering and Comp Sci Homework Help
How long to heat a given volume of air?
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[QUOTE="evoke1l1, post: 5920008, member: 593305"] [h2]Homework Statement [/h2] I am working on a problem where I need to determine the time taken for an air heater with an 8kW output to heat a volume of air of 9m^3 by 25C. I am neglecting all losses at the moment. It almost seems too simple in my mind that I'm concerned I'm overlooking something.[h2]Homework Equations[/h2] cp = 1005 J kg-1 K-1 [COLOR=#000000]ρ[I] = [/I] 1.534 kg m-3[/COLOR] [COLOR=#000000]Q = cp * m * dT[/COLOR][h2]The Attempt at a Solution[/h2] Q = 1005 * (1.534 * 9) * 25 = 346875.75 J = 0.35MJ As 1kWh = 3.6MJ: 0.35 / 3.6 = 0.097kWh required for a dT of 25C to heat a 9m^3 volume of air. The time required would therefore be 0.097 / 8 = 0.012 hours or approximately 43 seconds. Am I along the right lines here? [/QUOTE]
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How long to heat a given volume of air?
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