Category Archives: Simulation & Thermodynamics

Simulation & thermodynamics.

Unit operations that cannot be simulated

Refinery Process Modeling by Gerald Kaes is a great book on using commercial process simulation packages to model refineries and related processes. But Kaes admits that 5 unit operations cannot be adequately simulated by typical commercial simulation software. I thought … Continue reading

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Posted in Simulation & Thermodynamics | Tagged , , , , , , , , , , | 3 Comments

Cracked Gas from Vacuum Unit Heaters

Below, I list sources you can turn to when estimating the cracked gas generated from vacuum tower heaters. That way, you know the flowrate and composition of light-ends generated in the vacuum tower’s pre-heat furnace. Background: Vacuum Units are typically … Continue reading

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Posted in Fired Heaters, Oil, Natural Gas, Coal, Simulation & Thermodynamics | Tagged , , , , | Leave a comment

Introduction to Aspen Basic Engineering (Zyqad) and Database-Driven Design

Trouble with Aspen Basic Engineering,  formerly known as Aspen Zyqad? This post will help the new user get acquainted with the program. What is Aspen Basic Engineering/Zyqad? What is Database Driven Design? Aspen Basic Engineering is one of those database-driven … Continue reading

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Posted in Database-Driven Design, Drawings and Diagrams, Excel, Simulation & Thermodynamics | Tagged , , , , , , , , , , | 1 Comment

Insulation Design Programs (Free)

Ever had to select insulation for a new pipe, or estimate the energy losses from pipes and equipment? Or do the economic justification for thicker insulation? Try either of the two free programs in this post. Try out 3e Plus … Continue reading

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Posted in Heat Exchange, Pumps/Piping/Hydraulics, Simulation & Thermodynamics | Tagged , , , , , , | Leave a comment

Aspentech’s Hysys: Fluid Package (Thermodynamics) Notes

Aspentech’s Hysys is a process simulation tool. You always have to pick a “fluid package” when you use the program: a thermodynamic method it will use to calculate properties, especially vapour-liquid equilibria. I watched an old "webinar" (presentation given through … Continue reading

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Posted in Simulation & Thermodynamics | Tagged , , , , | 12 Comments