Deviations in the properties of water simulated by Aspen
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For the simulation of hydrocarbons using Aspen7, the property method selected is PR-BM. In the simulation, water was used as a cooling medium to cool the hot gas, and upon checking the results, it was found that there is still a significant deviation in the simulation of water’s properties for PR-BM. Although it is understood that PR-BM is not suitable for simulating water, using PR-BM throughout the entire process is more appropriate. How do people deal with this kind of problem? Should we ignore the results for water? Is it still possible to set the calculations for water’s physical properties separately? Seeking advice.
For water and water vapor, steam and NBS can be used
Thank you for your attention. Simulation is not specifically aimed at water; it’s just that water is used in the heat exchanger part of the process. Therefore, the physical property methods are set globally; can water be set separately here? How to operate it?
Yes, it’s possible to set the properties for free water
Free water can be set separately, but the water used in heat exchangers shouldn’t be considered free water, right? I still would like to ask how to set the cooling water for the heat exchanger?
Method for separately setting the physical properties of the material on the water side
I still need to ask the expert for guidance on how to \"set the physical properties of materials on the water side separately\"
In HYSYS, two stream packages can be set: PR for the hydrocarbon system and steam for the cooling water. Plus should also allow multiple logistics packages to be set within the same process. For cooling water, heat transfer is represented as equivalent utility consumption; the utility type can be set in HYSYS, and by using heaters or coolers, energy consumption can be directly converted into utility consumption, with statistical functions available as well.