Recent content by penderway

An accurate value of Humid Air Enthalpy (whether moist air specific or dry air specific) is critical for calculating air conditioning load and/or equipment performance, especially when the highest accuracy is desired. The formulae used in my calculator... (see page 6, 10 & 11 of this pdf...

One other thing... Am I using it properly Here? This is the actual calculator Psychrometric Calculator?

Much appreciated.

What is the correct notation for Volumetric Heat Capacity? I see it written both ways (Wiki for example). I'm pretty sure one is more correct but which is it? (1) Btu/ft³·°F or (2) Btu/(ft³·°F)

I thought it was common knowledge that the cooling and dehumidifying process had an ADP (apparatus dew point) that was a straight line thru the state points to the saturation curve. I've read in system design literature that if it did not, then it was an invalid cooling and dehumidifying...

I've not quantified it. I believe it's insignificant in the common ranges of temperature, humidity and altitude. I am in no way disputing the practice of using dry air specific units for design purposes. I only advocate the highest accuracy possible when measuring and calculating the actual...

Here's my understanding...and I welcome any corrections. Dry air specific is the most commonly used unit of measure for HVAC design, It is the mass of dry air plus (and separate from) the mass of moisture it carries. Much easier to use in calculations and is accurate enough in the temperature...

Thanks, I have, It's right on target with the many typical psychrometric charts available (depending if they incorporate enhancement and compressibility factor. Trouble is they are all "Dry Air Specific". Now if I could find a moist air specific chart, that would be nice. :)

Thanks for the response. I believe that the calculator is working correctly. It's a bit different than standard psychrometric calculators in that it can calculate with moist air specific units, instead of just the common dry air specific and standard air units. I had some doubt that I was...

New here and this is my first post. I've developed an online psychrometric calculator and I believe it is now working perfectly. I would like someone or anyone who has expertise in this area to check my work. The link is...