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21
ENT AIR
Table 18:
Capacity Correction Factors* To Coil Performance
Of 67°F Wb And 40°F Evaporating
Ent Air WB Refrigerant Evaporating Temperature °F.
Temp. °F. 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
60 0.820 0.794 0.768 0.740 0.713 0.685 0.656 0.628 0.598 0.568 0.538 0.506 0.475 0.442 0.409 0.376
61 0.862 0.837 0.810 0.783 0.756 0.727 0.698 0.670 0.640 0.610 0.580 0.548 0.517 0.484 0.452 0.418
62 0.907 0.881 0.854 0.827 0.799 0.771 0.743 0.714 0.684 0.654 0.623 0.592 0.561 0.528 0.496 0.462
63 0.950 0.923 0.897 0.870 0.842 0.814 0.785 0.756 0.727 0.696 0.666 0.635 0.603 0.571 0.538 0.505
64 0.994 0.969 0.942 0.914 0.887 0.859 0.831 0.802 0.772 0.742 0.712 0.680 0.649 0.616 0.583 0.550
65 1.040 1.014 0.988 0.960 0.933 0.905 0.876 0.847 0.818 0.788 0.757 0.726 0.694 0.662 0.629 0.596
66 1.087 1.061 1.035 1.008 0.980 0.952 0.923 0.894 0.864 0.835 0.804 0.773 0.741 0.709 0.676 0.642
67 1.136 1.109 1.083 1.055 1.028 1.000 0.971 0.943 0.913 0.883 0.852 0.822 0.789 0.757 0.724 0.691
68 1.185 1.158 1.132 1.105 1.077 1.050 1.020 0.992 0.962 0.932 0.901 0.870 0.838 0.806 0.773 0.740
69 1.235 1.209 1.182 1.155 1.127 1.100 1.071 1.042 1.012 0.982 0.952 0.920 0.889 0.856 0.824 0.790
70 1.286 1.260 1.235 1.206 1.179 1.152 1.122 1.094 1.063 1.033 1.003 0.972 0.940 0.908 0.875 0.841
71 1.339 1.313 1.285 1.260 1.231 1.203 1.175 1.146 1.115 1.086 1.055 1.024 0.993 0.960 0.927 0.894
72 1.393 1.365 1.340 1.314 1.285 1.257 1.229 1.200 1.170 1.140 1.110 1.079 1.046 1.015 0.981 0.948
73 1.450 1.422 1.395 1.369 1.340 1.313 1.285 1.255 1.225 1.195 1.165 1.134 1.103 1.070 1.036 1.003
74 1.505 1.479 1.451 1.425 1.396 1.370 1.340 1.310 1.281 1.252 1.221 1.190 1.159 1.126 1.094 1.060
* Note: correction factor = (enthalpy of air temperature - enthalpy of evaporator temperature) in BTU/LB divided by 16.39
Coil Performance- Direct Expansion MBH/SQ FT
Table 17
Wet Evaporator
Capacity
1/2" and 5/8" tube, entering air 80°F. DB, 67°F. WB
Type A and Type 5, direct expansion at 40ºF. evaporating, cooling capacities
MBH per SQ FT of coil face area
FPM, Type A Coils (1/2" DIA.) FPM, Type 5 Coils (5/8" DIA.)
Rows FPI 400 450 500 550 600 400 450 500 550 600
6 11.3 12.1 12.8 13.4 14.0 13.1 13.8 14.5 15.2 15.8
8 13.0 13.9 14.7 15.4 16.1 14.9 15.8 16.6 17.4 18.1
3 10 14.4 15.3 16.2 17.0 17.8 16.2 17.2 18.2 19.0 19.8
12 15.4 16.5 17.4 18.3 19.1 17.3 18.4 19.4 20.3 21.2
14 16.3 17.4 18.4 19.3 20.2 18.0 19.2 20.4 21.4 22.4
6 14.0 15.0 16.0 16.9 17.7 15.8 16.8 17.8 18.7 19.5
8 15.9 17.1 18.2 19.2 20.1 17.7 18.9 20.0 21.0 22.0
4 10 17.4 18.7 19.8 20.9 22.0 19.0 20.4 21.7 22.8 23.9
12 18.5 19.9 21.2 22.3 23.4 19.9 21.4 22.8 24.1 25.3
14 19.4 20.9 22.2 23.5 24.6 20.7 22.3 23.8 25.2 26.5
6 15.9 17.1 18.3 19.3 20.3 17.9 19.2 20.5 21.6 22.6
8 18.3 19.7 21.1 22.3 23.5 19.8 21.3 22.7 24.0 25.2
5 10 19.8 21.3 22.8 24.2 25.5 21.0 22.7 24.3 25.7 27.1
12 20.9 22.6 24.2 25.6 27.0 21.8 23.6 25.4 27.0 28.5
14 21.8 23.6 25.3 26.8 28.3 22.5 24.4 26.3 28.0 29.6
6 17.8 19.2 20.5 21.7 22.8 19.7 21.2 22.7 24.0 25.3
8 19.7 21.3 22.7 24.1 25.4 21.4 23.1 24.8 26.3 27.8
6 10 21.1 22.8 24.4 25.9 27.2 22.5 24.4 26.3 28.0 29.7
12 22.1 23.9 25.6 27.2 28.7 23.3 25.3 27.3 29.2 31.0
14 22.9 24.8 26.6 28.2 29.8 23.9 26.0 28.1 30.1 32.0
6 20.9 22.7 24.3 25.9 27.4 22.3 24.2 26.0 27.7 29.4
8 22.7 24.7 26.6 28.4 30.0 23.8 25.9 28.0 29.9 31.7
8 10 23.9 26.1 28.1 30.1 31.9 24.6 27.0 29.3 31.3 33.3
12 24.8 27.1 29.3 31.3 33.2 25.2 27.7 30.1 32.4 34.6
14 25.4 27.8 30.1 32.2 34.2 25.7 28.2 30.7 33.1 35.4
Actual capacity will vary
with coil circuiting
Note: Please contact your representative for ARI ratings for coils. These tables are only estimates.
For extimates for other web bulb and evaporator temperatures, multiply by correction
factors in Table 18.