Repeat Problem 20.12 for the case when the specific heat capacities of both streams vary linearly with
Question:
Repeat Problem 20.12 for the case when the specific heat capacities of both streams vary linearly with temperature with the following values:
Stream 1: Cp = 2000 + 3(T − 100) J/kg/K
Stream 2: cp = 2425 + 5(T − 50) J/kg/K
Problem 20.12
A process fluid (Stream 1) (Cp = 2100 J/kg/K) enters a heat exchanger at a rate of 3.4 kg/s and at a temperature of 135°C.
This stream is to be cooled with another process stream (Stream 2) (cp = 2450 J/kg/K) flowing at a rate of 2.65 kg/s and entering the heat exchanger at a temperature of 55°C. Determine the following (you may assume that the heat capacities of both streams are constant):
The exit temperature of Stream 1 if pure countercurrent flow occurs in the exchanger and the minimum approach temperature between the streams anywhere in the heat exchanger is 10°C
The exit temperature of Stream 1 if pure cocurrent flow occurs in the exchanger and the minimum approach temperature between the streams anywhere in the heat exchanger is 10°C
Step by Step Answer:
Analysis Synthesis And Design Of Chemical Processes
ISBN: 9780134177403
5th Edition
Authors: Richard Turton, Joseph Shaeiwitz, Debangsu Bhattacharyya, Wallace Whiting