A well insulated water tank contains 100 lit of water at 27
C. We want to heat the water to 90 C. For this purpose we place a coil made of
copper with an outside diameter of 1.2 cm in the water. The coil carries steam
at 115 kPa. Ignore the thermal resistance of the condensing steam. Find a) the
required heating time and b) the amount of steam condensed in the coil.
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