Design of Heat Exchange Network


A process has four streams with equal mass flow rates and the characteristics given below.  Devise a heat-exchange network to minimize the amount of the utility streams, water and steam, that must be used to accomplish the desired change in energy state of the four streams.  You can use as many heat exchangers as you need to.  Consider using cross-exchangers in your design. 

Process Stream                                  Inlet Temp.oC           Desired Outlet Temp. oC
A – ethanol                                                   60                                      160
B – 80% ethanol, 20% isopropanol                160                                       93
C – 20% ethanol, 80% isopropanol                116                                     220
D – propanol                                                250                                     138
Available utilities:
Cooling water at 25 oC.
Saturated steam at 150 psg


The question belongs to Chemical Engineering and it is about heat exchange network. The question here is about a heat exchange network to minimize the amount of utility streams that are used to change the energy state of four streams.

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