I would like to know the two differences in the design specs for simulation
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Recently, while doing simulations, I noticed that both the block and flowsheeting options in Aspen come with design specifications. What is the difference between these two? I hope for a more detailed explanation, as I got different results when using these two methods to solve a problem
Different results arise from different precisions of the two; when the settings are the same, the precision is the same and the resulting values are identical.
It’s best to use one’s own design spec within the block, as this facilitates convergence.
One is the Global option and the other is the Block option
Try to use the internal functions whenever possible instead of those within BLOCK. For example, for towers, the built-in spec-design is generally used. The spec-design of the general process is used for controlling the entire process, such as the circulation ratio or the hydrogen-to-oil ratio.