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HW8 - Department of Chemical Biochemical Engineering...

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Department of Chemical & Biochemical Engineering Rutgers, The State University of New Jersey 98 Brett Road Piscataway, NJ 08854 54 14:155:201 Chemical Engineering Analysis I Homework Assignment 8 revised 11/11/08 (due 11/13/08) Note: When using steam tables, interpolate if necessary to obtain values at the appropriate T and P. 1. Simplify the general energy balance for each of the following processes. For each term in the general balance equation state the reason that you retained or eliminated it. Do not insert numerical values into the equation. Example: The contents of a closed flask are heated from 25°C to 80°C. Solution: General energy balance for closed system: E K + E P + U = Q – W Terms: E K = 0 system is stationary E P = 0 no height change of system W = 0 no moving parts or electrical currents U 0 temperature change Q 0 system not insulated Simplified energy balance: U = Q (a) A fluid flows steadily through a poorly designed coil in which it is heated from 20°C to 130°C. The pressure at the coil inlet is 8 atm and at the coil outlet is 5 atm. The coil is of uniform cross section,
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