Talk:Psychrometrics

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[edit] Does anyone know the relationship between <dewpoint,dry temp> and wetbulb?

I've looked around the net and there seems to be a lack of formulae. Looking at the graph the wet bulb temps appear to be a constant gradient intersecting the saturation curve but how is this derived? njh 10:16, 11 January 2006 (UTC)

[edit] Dew Point Formulas

This calculation is trickier than it looks. The standard source is the ASHRAE Handbook: Fundamentals. Look in Chapter 6, Psychrometrics, under Numerical Calculations of Moist Air Properties, to find what you are looking for. Most libraries should have a copy in the reference section. Note that it's published in English and metric editions. Tex 16:15, 20 February 2006 (UTC)

Not in Australia :-(. I can probably deduce it from the Clausius-Clapeyron relation though. Thanksnjh 20:54, 20 February 2006 (UTC)

The relevant chapter can be downloaded from the ASHRAE website as a PDF file, for a fee which is greater than nominal but not outrageous. I think it is USD 50. Tex 23:39, 20 February 2006 (UTC)

[edit] Mollier diagram

This external link [1] shows the relation between the Mollier diagram and the Psychrometric chart. 57.66.65.38 10:25, 11 April 2006 (UTC)

This is a little confusing because in fact several different thermodynamic diagrams are known as "Mollier diagrams". The most common is the enthalpy-entropy, or hs diagram. Probably the next most common is the pressure-enthalpy, or ph diagram. In fact I have never heard the enthalpy-composition diagram, as discussed here, called a Mollier diagram, but apparently it can be. Old Mollier must have really been working hard in those days! Tex 15:12, 11 April 2006 (UTC)