Questions about calculating entropy in Aspen Plus
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The calculation results include a value called entropy. What is used as the basis for this value? It certainly isn’t absolute zero, as my calculation results are often negative. If this value represents a change, then it exists in the calculation results for each flow stream; so what is the initial value used for comparison? Could anyone also suggest a method for calculating the entropy of mixed gas flow streams using ASPEN PLUS or PROII? Thank you very much :) :) :) :)
I also ran into the issue of negative values when calculating turbines... W = W0 – W1; where W0 represents the work input to the model, and W1 represents the work output by the model. Taking a turbine model as an example, the work input to the turbine is 0. If the output power is 50 MW, then it will be displayed as -50 MW for the power generated by the turbine. The problem you’re facing is likely similar to mine; you should take another look at it
There can be two standards: 298.15 K for ideal gases, and 273.15 K for saturated liquids. For more details, please refer to the help section, where it is explained in great detail.