Questions - There are two questions about heat exchanger design.
Q1. You are given the following information of available streams that needs to be either cooled or heated as described below:
|
Stream
|
Inlet Temp. oF
|
Outlet Temp. oF
|
Flow Rate Lb/hr
|
Heat Capacity, Cp
|
|
2
|
140
|
320
|
20,600
|
0.7
|
|
3
|
320
|
200
|
27,800
|
0.6
|
|
1
|
240
|
500
|
23,000
|
0.5
|
|
4
|
480
|
280
|
25,000
|
0.5
|
Assumptions:
U0 = 125 Btu/ft2.oF
Cost of per year of heat Exchanger: (A0)0.75(350) (0.14) = $/year
Cost of cooling water per year: (MW) (8500)(5x106) = $/year , MW- Lb/hr
Cost of steam/year= (Msteam) (8500)(0.001)= $/year, Mass of steam (Msteam)- Lb/hr
Cooling water is available at 75 oF and can be heated to no more than 120 oF
Saturated steam is available at 540 oF
Temperature difference (Th-Tc) limit is 20 oF also called temperature approach
Find the optimum (best) arrangements with minimal total cost per year.
Q2. Design a heat exchanger (condenser) to heat up 340,000 Lb/hr boiler feed water in a power plant form 260oF to 373oF (saturated liquid) using 20,000 Lb/hr saturated steam at 401oF.
Reading - Textbook - Basic Theory of Heat Transfer in Exchangers
Chapter 14 - Heat-Transfer Equipment-Design and Costs.
Attachment:- Assignment Files.rar