Determine the Water Volume

The following chart was created to simplify the procedure necessary to determine the amount of water vapor that is present in a cubic foot of air at various temperature and humidity conditions. The design conditions are based on sea level (14.7 PSIA), and 35¼ pressure dew point.

Gallons Per Hour Per CFM


Temp º F
  Percentage Of Saturation    
350.0010.00120.00150.00170.0020.00220.0024
400.00120.00150.00170.00210.00240.00260.0029
450.00140.00180.00210.00250.00280.00320.0035
500.00170.00210.00250.0030.00340.00380.0042
550.0020.00250.0030.00350.0040.00450.005
600.00240.0030.00360.00420.00480.00540.006
650.00280.00350.00420.00490.00560.00630.007
700.0030.00410.0050.00580.00660.00750.0083
750.00390.00490.00580.00680.00780.00880.0097
800.00450.00570.00680.0080.00910.01020.0114
850.00530.00660.00790.00930.01060.01190.0132
900.00610.00770.00920.01080.01230.01380.0154
950.00710.00890.01070.01250.01420.0160.0178
1000.00820.01030.01230.01440.01640.01850.0205
1050.00950.01180.01420.01660.01890.02130.0236
1100.01080.01360.01630.0190.02170.02440.0271
1150.01240.01550.01860.02170.02480.02790.031
1200.01420.01770.02120.02480.02830.03190.0354

To use this chart, determine your maximum temperature and humidity condition. (In the event you are between ratings, please round up to the next number present.) Locate the factor that is at the intersection point of these two conditions. Take the CFM rating of the air compressor system that you intend to dehydrate. Multiply the CFM by the factor at the intersection of the proper conditions. The answer you get is the total amount of water in gallons per hour that would be condensed when chilled to 35¼ F

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