Latent heat formula for HVAC engineers - where does Q = 4,790(CFM)Δω come from?

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In this video, I derive a version of the shorthand formula for determining the latent heat during a typical HVAC dehumidification/humidification process.
  1. Mitchell Paulus
  2. HVAC
  3. ASHRAE
  4. Education
  5. Screencast
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Комментарии
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Thanks for the great video. Why is humidity ratio unitless? Should it not have units of lb moisture per lb dry air? In the formula mdot_w = mdot_a*(deltaW) it is imperative that the lbs of air cancels.

richardaipperspach
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MITCH, ASHRAE 2017 Fundamentals, 18:15, uses the number 1076, which they say represents latent heat at 75/50% minus the enthalpy of leaving condensate at 50F. Sounds reasonable, don’t you think?

robertingersoll
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Dear sir, in your converting mass flow rate of dry air
m dot (lb/hr) = roh of air (lb/ft3) x Vol(ft3/hr)
Now to convert
Vol from (ft3/hr) to (ft3/min)
We have Vol (ft3/min) = (1/60) x ft3/min

So how come you are mutilplying by 60 instead of dividing by 1/60

Could y explain 🤔

thepurposeofmyexistence
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THANKS A LOT, JUST(DELTA w) are they from off coil and on coil ?

abdjbr
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Shouldn’t it be mv2-mv1=mw? Since the sum of flow in equals the sum of flows out? Basically the first principle no?

desiffer
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Sir, Would you please explain to me the term delta h from q = 4.5 CFM delta h, delta h is h1-h2, or h2-h1? Thank you,

radusettenhofer