Exergy loss profiles

Use exergy loss profiles to identify the regions performing poorly. 

The Aspen Plus simulator with a suitable thermodynamic model generates the stage-exergy loss profiles of distillation columns from the exergy balance of stage i... 

The converged mass and heat balances and the exergy loss profiles produced by the Aspen Plus simulator can help in assessing the thermodynamic performance of distillation columns. The exergy values are estimated from the enthalpy and entropy of the streams generated by the simulator. In the following examples, the assessment studies illustrate the use of exergy in the separation sections of a methanol production plant, a 15-component two-column... 

Figure 4.31. Exergy loss profiles of column 1 for Example 4.26 (a) stage-exengy loss and (b) temperature-exergy loss.

Using the following input summary for RADFRAC columns, construct the temperature-enthalpy, stage-enthalpy curves, and the stage-exergy loss profiles for each columns and assess the thermodynamic performance of the columns ... 

Figure 5.13. Exergy loss profiles for column 1 in Example 5.15 (a) temperature-exergy loss profiles and (b) stage-exergy loss...

Especially the second column is practically a binary distillation column. As the exergy loss profiles in Figures 4.8 and 4.9 show that both the columns operate with rather large exergy losses. ... 

FIGURE 4.9 Exergy loss profiles of column 2 vinyl chloride production plant (a) Stage-exergy loss profiles, (b) temperature-exergy loss profile. (For color version of this figure, the reader is referred to the online version of this book.)... 

FIGURE 5.8 (a) Column grand composite curves for column 1 and (b) exergy loss profiles for column 1. 

Fig. 3. (a) comparison of the stage-enthalpy deiieit eurves of base ease and VRHP (b) eomparison of the stage-exergy loss profile of base case design and VRHP. 

---