PsychroCoilCalc™ - Psychrometric and Coil Performance Calculator version 1.2
Enter and adjust the values in the blue boxes, Click the "Update" button for the results.
  Altitude   Entering Static Leaving Static Temperature(s) needed  
  ft "wc "wc  
           
Entering Air °F      
     
Dry Bulb Wet Bulb      
       
Provide a dry bulb temperature    
Leaving Air °F      
   
Dry Bulb Wet Bulb      
     
 
     
   
  Entering Leaving      
  1   0 lb/ft³ 0 lb/ft³ Density (ρ)
  14.6869 psia 14.7049 psia Pressure (p)
    0 ft³/lb 0 ft³/lb Specific volume (v)
    0 Btu/lb 0 Btu/lb Specific Enthalpy (h)
    0 lb/lb 0 lb/lb Humidity ratio of moist air (W)
  0 lb/lb 0 lb/lb Humidity ratio of saturated air (Ws)
  0 lb/lb 0 lb/lb Humidity ratio of saturated air at wb (Ws*)
  0 Btu/lb 0 Btu/lb Specific Enthalpy of saturated water vapor (hg)
  0 psia 0 psia Partial pressure of water vapor (Pw)
  0 psia 0 psia Water vapor pressure at saturation (Pws)
  0 psia 0 psia Water vapor pressure saturated at wb (Pws*)
   
     
         
         

 

To find a coils output capacity:

To calculate Btu's per pound of dry air (btu/lb), provide "Entering Air" and "Leaving Air" dry bulb temperatures, for Btu's per pound of moist air, add the entering air wet bulb temperature. To calculate changes in humidity include the leaving air wet bulb temperature as well. Provide the airflow volume in cubic feet per minute CFM to convert Btu's per pound of air to Btu's per hour.

 

Wet bulb temperatures, if not entered are calculated for dry air and/or equal grains of moisture when possible.

The calculations of refrigerant load show a division of the true sensible and latent heat loss or gain of the air. Calculations are accurate within the limitations of the data. The calculations will not correspond to load determinations obtained from approximate density factors or constants i.e. 1.08, 4.5 & 0.68 unless the leaving air is 70°F dry bulb, 0% relative humidity and 14.696 psi atmospheric pressure.