spogis/psychrometry

Psychrometry Template for DWSIM - Version 1.1

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psychrometry's Issues

Psychrometric calculation errors

Hi. Thanks for posting this nice tool but I wanted to point out apparent errors in the calculation. To clarify, I have a masters degree strongly focussed on humid airflow calculations, which is where my comment originates. If you go to a site like https://www.kwangu.com/work/psychrometric.htm you can calculate the psychrometric properties of most humid airstreams pretty accurately. What's particularly interesting is the humidity ratio given. It must be noted that this is not a ratio of vapor mass to total mass, this is a ratio of vapor mass to dry air mass. The psychrometric calculations use this is because the dry air mass is constant and only the vapor mass changes. Thus the vapor mass ratio should be calculated as:
(vapor mass/kg da)/(1kg dry air/kg da + vapor mass/kg da) [da = dry air, vapor mass/kg da is the humidity ratio].
This seems to be incorrectly done in your calculator as I find it impossible in many instances to generate a 100% humid air stream and also the mass fraction of the vapor ['vapor mass ratio'] is currently = to the humidity ratio in the psychrometric popup, which is not possible. I do find it interesting that the density calc works, since it requires the same foreknowledge, but perhaps this is due to rounding or different formulas, idk.
Please feel free to contact me about this and thanks again for the tool.

Alert for previous issue

Hi Prof.

I'm not sure if you get updates on issues already deemed closed, so I am posting here to point back to my comment on the previous issue.