HW1 individual - ChE 381 Fall 2013 Homework#1 due Fri Sept...

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ChE 381 Fall 2013 Homework #1, due Fri Sept 6 th This assignment covers chapters 2 and 4. Individual : 1. A well-insulated carbon steel tank (10 kg) filled with 20 kg of 15 0 C water is to be used to cool a 2-kg quartz slug, initially at 650 0 C. Use C p,298 and assume the value is constant. Cite your source for your heat capacity values. (a) What is the final temperature of the water? (b) The initial temperature of the slug can sometimes fluctuate to up to 700 0 C and its size can fluctuate up to 3 kg. Safety standards require that the temperature of the water not rise above 40 0 C. Is there currently enough water in the tank? (c) Your colleague has suggested that switching to a 50/50 wt% mixture of ethanol and cyclohexane, instead of pure water will decrease the required amount of coolant. Is your colleague correct? Justify your answer. (d) What would be some of the implications or challenges of switching to a mixture of cyclohexane and water?
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