Quote Originally Posted by Trehak01 View Post
So, let me get this straight. I am going to find my supply wet bulb, return wet bulb and my static pressure..(NO!) that will give me the the BTU per pound of dry air. subtract the two, to get the difference. Use the (enthalpy change) difference in equation(total heat removed=CFMx4.5xEnthalpyChange)

I did so and got 27,657.. not what I was thinking.. I would assume I did something wrong here...
The SA RA wet bulb temps have to be looked up on the enthalpy chart; then subtract the lower enthalpy number from the higher enthalpy number.
Then multiply the CFM airflow * 4.5 if at sea level & that result times the enthalpy difference. That's supposed to give you the Btu.

You don't use the static pressure number.