Synthesis of Heat Exchangers Network (HEN) by Revisiting the Method Based on 2nd Law of Thermodynamics

As the project title implies, this project is basically about synthesizing an optimum heat
exchanger network (HEN) by using a new approach which revisits second law of
thermodynamics. This paper is started with introduction which gives an overview of
project background, problem statement, objective, and scope ofproject.
Then, literature review gives clearly about the theory of the project. The following
section touches on methodology of the project. Algorithm of HEN has been displayed in
this section. This project requires using simulation tools, such as HYSYS to find out the
relationship between total exergy lost and hot stream outlet temperature.
Formulation has been performed to obtain generic function equations for Cp, Hf, Sf, Hfg,
Sfg. In the formulation process, Graph Software is used to choose the best fit trends for all
these values with respect to their temperatures.
Generic function equations are then used in the calculation of energy balance and exergy
lost. All calculations are computed in a template in Microsoft Excel. T hot out and Cp coid out
are considered as manipulated variables to decide the lowest exergy lost of the HEN. To
solve for the minimum exergy lost of HEN more conveniently, "solver" in Microsoft
Excel is used.
Finally, the project is concluded in the last section. Recommendations on procedures are
also stated to improve the method. Future works are including the transformation of
algorithm into GAMS or other mathematical programming tools.