5 - Assume the tile and subfloor to have an initial...

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CHE 378: Heat and Mass Transfer Spring 2008 Homework 5 Due: Friday, February 2, 2008 at the beginning of lecture 1. Middleman 11.12 2. Middleman 11.25 3. A tile-iron consists of a massive plate maintained at 150°C by an imbedded electrical heater. The iron is placed in contact with a tile to soften the adhesive, allowing the tile to be easily lifted from the subflooring. The adhesive will soften sufficiently if heated above 50°C for at least 2 min, but its temperature should not exceed 120°C to avoid deterioration of the adhesive.
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Unformatted text preview: Assume the tile and subfloor to have an initial temperature of 25°C and to have equivalent thermophysical properties of k = 0.15 W/(m*K) and ρ C p = 1.5 x 10 6 J/(m 3 *K) (a) How long will it take a worker using the tile-iron to life a tile? Will the adhesive temperature exceed 120°C? (b) If the tile-iron has a square surface area and has a side length of 254 mm, how much energy has been removed from it during the time it has taken to lift the tile? Tile, 4-mm thickness Subflooring...
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