THE INFLUENCE OF DIFFERENT TEMPERATURE CONTRIBUTIONS ON HEAT-INTEGRATED PROCESS STRUCTURE

Correct choice of the contributions (Delta(cont)T) to the minimum appr oach temperature (Delta(min)T) are most important in processes with sm all differences between the lowest and the highest temperatures of the process. Temperature contributions in such processes have to be very low. It has been found that fixed Delta(coat)Ts sometimes gave higher energy targets than those derived from the simulated base process, In such cases also, the location of available utilities and process units against pinch temperature could be wrong. More realistic results were obtained using an approach based on appropriate areic heat flow rates , i.e. based on heat transfer areas. The best results came from indivi dually calculated contributions for simulated heat exchange units.