Leaving enthalpy for a total coil load calculator

Required leaving moist-air enthalpy is calculated as h_enter − q_total/(4.5 × cfm). Use the stated system boundary and matching input units.

Units

h_{\text{leave}} = h_{\text{enter}} - \frac{q_{\text{total}}}{4.5 \times \mathrm{CFM}}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

h_{\text{leave}} = 100 - \frac{50}{4.5 \times 33.33333333} \approx 99.667

Symbol	Meaning	Unit
$h_{\text{leave}}$	required leaving moist-air enthalpy	Btu/lb
$h_{\text{enter}}$	entering moist-air enthalpy	Btu/lb
$q_{\text{total}}$	total coil cooling load	Btu/h
$\mathrm{CFM}$	standard-air volumetric flow	cfm

Symbol	Meaning	Unit
$h_{\text{leave}}$	required leaving moist-air enthalpy	kJ/kg
$h_{\text{enter}}$	entering moist-air enthalpy	kJ/kg
$q_{\text{total}}$	total coil cooling load	kW
$Q_{\text{air}}$	standard-air volumetric flow	L/s

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.