Material selection for heating Aspen with steam
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When I was performing simulations of Aspen heat exchangers, I chose to use steam to heat toluene, and for property selection I used RK-SOAVE. However, I saw some people online say that when using steam in Aspen, one should select the properties related to steam; but I got an error after making that choice. The attached diagram shows the material properties I selected. Regarding the issue of heating toluene with water vapor, I want to know whether the principles for selecting material properties remain the same as usual when heating materials with water vapor Is there anything special about it?
That’s free water; there’s no need to choose for steam
It is only when calculating free water that those properties of steam are used; when heating with steam, the properties are selected in the usual way, right?
Free water is something you take into account when calculating the phase-separated components; for example, in water and oil, there are trace amounts of water in oil and trace amounts of oil in water. Once free water is defined, the software treats the water as a pure component (free from oil) during the calculations, which makes it easier to reach a solution and has little impact on the results. In simple heat exchange processes like this, phase separation does not occur, so there is no need to define free water