الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 139 |  |  |
| | | from | 139 | | |
Abstract
HENs links the process flow sheet with the utility system to employ resources effectively; therefore, it involves a big fraction of both the capital and operating costs, so that the optimum design for heat integration considered as one of the essential key factors to a profitable industry. Due to process variability operating parameters, it is significant to study and improve the flexibility of chemical plants. The flexibility defined as the capability to operate this plant over a range of conditions under external disturbances or inherent uncertainty while satisfying performance specifications by convenient control variables adjustment.
The target of this work is to introduce a new approach for designing optimal flexible HEN in a similar fashion of multi-period design depending on similar period durations of worst operating conditions. These worst conditions lie within the uncertainty range in terms of extreme heat load requirements to decrease number of exhaustive iteration and enhance flexibility index from the first design step.
This contribution work presents a combined systematic procedure for optimum flexible HEN design based on several mathematical models. Also, provide with comparison and evaluation of existing methods with cases study. This presented work resulted in optimum flexible HEN with controllable structure without losing stream targets while keep working at minimum energy consumption levels and achieved minimum TAC rather than three works in comparison.