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
35	0.001	0.0012	0.0015	0.0017	0.002	0.0022	0.0024
40	0.0012	0.0015	0.0017	0.0021	0.0024	0.0026	0.0029
45	0.0014	0.0018	0.0021	0.0025	0.0028	0.0032	0.0035
50	0.0017	0.0021	0.0025	0.003	0.0034	0.0038	0.0042
55	0.002	0.0025	0.003	0.0035	0.004	0.0045	0.005
60	0.0024	0.003	0.0036	0.0042	0.0048	0.0054	0.006
65	0.0028	0.0035	0.0042	0.0049	0.0056	0.0063	0.007
70	0.003	0.0041	0.005	0.0058	0.0066	0.0075	0.0083
75	0.0039	0.0049	0.0058	0.0068	0.0078	0.0088	0.0097
80	0.0045	0.0057	0.0068	0.008	0.0091	0.0102	0.0114
85	0.0053	0.0066	0.0079	0.0093	0.0106	0.0119	0.0132
90	0.0061	0.0077	0.0092	0.0108	0.0123	0.0138	0.0154
95	0.0071	0.0089	0.0107	0.0125	0.0142	0.016	0.0178
100	0.0082	0.0103	0.0123	0.0144	0.0164	0.0185	0.0205
105	0.0095	0.0118	0.0142	0.0166	0.0189	0.0213	0.0236
110	0.0108	0.0136	0.0163	0.019	0.0217	0.0244	0.0271
115	0.0124	0.0155	0.0186	0.0217	0.0248	0.0279	0.031
120	0.0142	0.0177	0.0212	0.0248	0.0283	0.0319	0.0354

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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