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Psychrometric charts, below sea level

Psychrometric charts, below sea level

Psychrometric charts, below sea level

(OP)
Does anyone know where I can find Psychrometric charts for below sea level, down to 5000 ft.

RE: Psychrometric charts, below sea level

If such things exist I would guess that the Navy would be the place to look.

Otherwise, resort to the formulas.

RE: Psychrometric charts, below sea level

jreng1
What is it you want to find out.

pennpoint

RE: Psychrometric charts, below sea level

(OP)
pennpoint,

I am working on an underground mining project and require Enthalpy values for air at 5000 ft underground.

jreng1

RE: Psychrometric charts, below sea level

I think any of the psychrometric calculators available could do this.  Just enter -5000 ft as the altitude.

One option is here:  http://pmilligan.net/pmtherm.htm

I have no affiliation with that that, other than I use it.  There are others available, a Google search should quickly turn up several.

Or, as I had previously suggested, crank out the formulas yourself.

RE: Psychrometric charts, below sea level

My humble java psych calculator will properly handle "negative" altitudes within reason:  http://members.socket.net/~aschoen/psychcalc.html.

Unfortunately with PMTHERM, altitude is selected from a combo box, and -1000 ft is the lowest value accepted.  The psychrometric equations behind PMTHERM would have accepted lower values though.  But Paul and I didn't think anyone would need them.  I did the psychrometric calculation programming for PMTHERM.

RE: Psychrometric charts, below sea level

Prof,

in PMTherm -1000 is the lowest value available on the pull-down, but the combo box is not restricted to only values in the list.  You can type in what ever you want.

RE: Psychrometric charts, below sea level

MintJulep, you are correct.  Paul Milligan wrote the interface, and I do see where he allowed user input for altitude.

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