Abstract
Chemical processes are energy intensive industries; the majority of energy consumed in industrial processes is mainly used for heating and cooling requirements. This results in increasing the interest in obtaining the optimum design of the heat exchanger networks to reduce the energy consumption and face the growing energy crises. Most of the published literature over the last fifty years promotes the process integration technology as a main part of the process system engineering science. Graphical Pinch Analysis method normally includes two key steps, firstly obtaining the energy targets which include the minimum energy required for the HEN design, then designing the heat exchanger network (HEN). This paper introduces a new graphical approach for the design of new heat exchanger networks (HENs) based on pinch analysis rules. The HEN is represented on a simple graph, where the cold stream temperatures are plotted on the X-axis while the driving forces for each exchanger are plotted on the Y-axis. This graphical technique can describe the energy analysis problems in term of temperature driving force inside the heat exchanger, which is an important factor in the design process as the differences in these driving forces are involved in calculating the area of heat exchangers, and consequently affecting the cost.
Highlights
The Renewable Academy of Germany [1], performed a statistical analysis to that highlighted that total heat energy consumption in the German industry is more than three times higher that of electrical energy consumption
This paper introduces a new graphical approach for the design of new heat exchanger networks (HENs) based on pinch analysis rules
Graphical pinch analysis method normally includes two key steps, firstly obtaining the energy targets which include the minimum energy required for the HEN design, designing the heat exchanger network (HEN)
Summary
The Renewable Academy of Germany [1], performed a statistical analysis to that highlighted that total heat energy consumption in the German industry is more than three times higher that of electrical energy consumption. Heat integration using pinch analysis was developed by Linnhoff and Hindmarsh [2], they proposed three essential strategies to decrease the energy requirements; firstly avoid the transfer of heat across the pinch, secondly avoid the presence of coolers above the pinch, and avoid the presence of heaters below the pinch. 3. Assuming constant heat capacities for process streams, each exchanger can be represented by a straight line drawn between (Tcs, !Tce) and (Tct, !The), as shown in Fig.. The slope of the exchanger is determined as the ratio between the difference in the driving force and the difference in the cold temperature for a certain stream as shown in Eq. which is involved in the heat transfer process.
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