Why can’t utility services be connected to the multi-stage compressors in ASPEN PLUS?

The first image shows a multi-stage compressor, while the second image shows a conventional compressor.

ASPEN PLUS is a process simulation software used to simulate and optimize chemical processes. In ASPEN PLUS, a multi-stage compressor is a special type of equipment that is typically used to handle processes that require high pressure. Due to the different working principle of multi-stage compressors compared to ordinary compressors, ASPEN PLUS does not provide an option to directly add utilities for multi-stage compressors. In ASPEN PLUS, utilities are generally used to represent energy supply or consumption, such as electricity and gas. For multi-stage compressors, ASPEN PLUS has already taken into account their specific energy requirements and supply conditions, so there is no need to add utility systems separately. If you need to add energy consumption for a multi-stage compressor model, this can be achieved in other ways, such as by adding heat exchangers to the simulation process to model energy input and output, or by using an energy consumption specifier to set the amount of energy consumed. In summary, utility systems cannot be directly added to multi-stage compressors in ASPEN PLUS, but you can use other methods to simulate their energy consumption. .

Does a multi-stage compressor not use electricity? ? ? ?

Of course, electricity is used, and the power value was also simulated in the end, but I don’t know how to include utility costs here.