Temperature difference th-tc limit is 20 of also called

Question

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: (M_W) (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 260^oF to 373^oF (saturated liquid) using 20,000 Lb/hr saturated steam at 401^oF.

Reading - Textbook - Basic Theory of Heat Transfer in Exchangers

Chapter 14 - Heat-Transfer Equipment-Design and Costs.

Attachment:- Assignment Files.rar