A tile-iron consists of a massive plate maintained at150C
Chapter 5, Problem 5.87(choose chapter or problem)
A tile-iron consists of a massive plate maintained at150C by an embedded electrical heater. The iron isplaced 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 above50C for at least 2 min, but its temperature should notexceed 120C to avoid deterioration of the adhesive.Assume the tile and subfloor to have an initial tempera-ture of 25C and to have equivalent thermophysicalproperties of k?0.15 W/m?K and ?cp?1.5106J/m3?K.(a) How long will it take a worker using the tile-iron tolift a tile? Will the adhesive temperature exceed120C?(b) If the tile-iron has a square surface area 254 mm tothe side, how much energy has been removed fromit during the time it has taken to lift the tile?
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