Helpful Equations Part 1
Here are a few helpful equations that we've found helpful through the years. Future posts will build on this list, and the back of our line card will have a summary of them all.
Cooling tonnage:
TONS = ((evap gpm) x (evap ΔT)) / (24)
*assumes evap ΔT in degrees F, and 100%water
Efficiency conversion:
KW/ton = 12 / EER
COP = EER / 3.412
EER = 12 / KW/ton
Psychrometrics
Qsensible = 1.085 x CFM x ΔT
*ΔT is deg F dry bulb
Qlatent = 0.68 x CFM x Δgrains/lb
*grains/lb measures Humidity Ratio or Specific Humidity
Qtotal = 4.5 x CFM x Δh
*h = enthalpy
