Common mistakes in process design/simulation

[subramanian.R]

Its really a valuable information . Pls everyone share ur experience . This error almost all process will make ,its for sure.....

[mohamedellejmi]

Another mistake I came across yesterday...

When designing a process where gas Chillers/Coolers are used, and when calculating the energy consumption, people have the tendency to use the Chiller duty (say 1MW) as an energy consumption.

However:

- if the chiller is a propane refrigeration unit, the duty to be considered is the energy absorbed by the Propane compressor's driver + lube oil pumps (if electrical) + condenser fans.

- if the chiller is just an Air Cooler, the duty to be considered is only the energy absorbed by fans.

- if the chiller is just a sea-water/gas heat exhanger, the duty to be considered is only the energy absorbed by the sea-water pump.


Guys, we need your experience... come on!

[uetian98]

EOS Selection Criteria from myside.
Hope this helps.

[Qalander]

Thanks Dear uetian98 for fairly good resource
Best regards
Qalander

[anwarahmad]

Welcome! Enjoy this forum and just shoot up your curious here to get the some promising answers.

[saverr]

Dear friends,
Thanks for sharing. These tips are very useful.

[zubair1950]

In case of smulating thermosyphon reboiler be carefeul as hysys inside column flowsheet indicates very high temperature at the last column tray even so that the reboiler return temperature is lower than the inlet .This inlet temperature to reboiler is misleading .Solution is to take the stream out o fthe flow sheet and install reboiler there, on coming out it will start showing right temperatures

[Sherif]

When designing a process where gas Chillers/Coolers are used, and when calculating the energy consumption, people have the tendency to use the Chiller duty (say 1MW) as an energy consumption.

However:

- if the chiller is a propane refrigeration unit, the duty to be considered is the energy absorbed by the Propane compressor's driver + lube oil pumps (if electrical) + condenser fans.
Why would we consider the summation of all these duties and not the duty exerted inside the chiller itself(i.e, energy absorbed by propane from HC or the fluid flowing on the other side of the exchanger?

- if the chiller is just an Air Cooler, the duty to be considered is only the energy absorbed by fans.

- if the chiller is just a sea-water/gas heat exhanger, the duty to be considered is only the energy absorbed by the sea-water pump.


Guys, we need your experience... come on![/QUOTE]