Psychrometric RH

[jrleeman]

Add capability to calculate the vapor pressure and relative humidity from wet and dry bulb temperatures. Supersedes #155

[jrleeman]

Should we have a separate test for passing a kwarg to relative_humidity_wet_psychrometric ?

[jrleeman]

Thoughts on the CLA? We can blast past it since the original PR was pre CLA or since I've rewritten it all, we can nuke that cherry pick.

[dopplershift]

Nuke the commit, but credit the idea in the commit message.

[dopplershift]

Just fix the spelling of vapor 😁

Good job digging up some firm references.

[dopplershift]

Vapour?

[dopplershift]

Sorry I didn't catch this before.

[dopplershift]

Verify that these explicit conversions are actually necessary--I don't think they are.

[jrleeman]

We can ditch them if we enforce that the psychrometer coefficient is in units of 1/K. Otherwise is someone throws a 1/degF coefficient at it, everything blows up. Thoughts?

[jrleeman]

Here's a few examples - I think we may even need to enforce that the coefficient be in 1/K manually:

coefficient = 6.0 / units.degK
T1 = 70 * units.degF
T2 = 13 * units.degC

print(coefficient*(T1-T2))
print(coefficient*((T1-T2).to('degK')))

87.5999976000002 delta_degF / kelvin
48.66666533333344 dimensionless

coefficient = 6.0 / units.degC # or degF, same behavior
T1 = 70 * units.degF
T2 = 13 * units.degC

print(coefficient*(T1-T2))
print(coefficient*((T1-T2).to('degK')))

OffsetUnitCalculusError: Ambiguous operation with offset unit (1 / degF, delta_degF).

[jrleeman]

The unit modification works with the coefficient in 1/K, 1/delta_degC, and 1/delta_degF for those who must try those.

[dopplershift]

Let's squish these commits down a bit, then I'd say we're good to go!