How to Calculate Dew Point of Gas Mixture

OK, how about the mixture water/air to illustrate the point? The dewpoint temperature is always the same, regardless of composition of the gas mixture at constant pressure.

So the dewpoint of any mixture of gases is always equal to the dewpoint of the heavier component at that pressure. The proportion of the mixture doesn't matter; the heavier component will always condense first. In the water/air mixture. the dewpoint of the water is always higher than that of the nitrogen/oxygen/whatever in the remainder of the mixture.

Thanks PWSlack for responding.

I belive if the gas mixture contains water then it must be a wet gas only. I don't need dew point of wet gas. But if the gas mixtures contains hydrocarbons,co2, h2s etc gases without any water traces, then I consider this as a dry gas and I need to calculate the dew point of this gas mixture.

Hope you got my problem? As I am Mechatronics Engineer, I am little bad on chemical compositions and related information. Request you to guide me if my concept is wrong.

Thanks

Nims

It's just that <...dry gas...> doesn't have a <...dewpoint...> per se, as the term refers to a stream containing water vapour.

Liquefaction temperatures can be looked up from the material properties of the components present. Any on-line encyclopaedia can provide this information.

Have you considered measuring the dewpoint?