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Page ___________ of ______________
Form C-HU - Page 8
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Use the following two tables to determine
1. Heating Capacity (MBH)
2. Leaving Air Temperature (LAT)
3. Condensate of water in lbs./hr.
4. Heat output measured in square feet of Equivalent Direct Radia-
tion:
1 ft
2
EDR = 240 BTUH at 2 psi steam
The performances reected in these tables are based on the follow-
ing:
● Steam pressure: 2 Pounds per Square Inch (psi)
● Entering Air Temperature (EAT): 60° (16°C)
ENGINEERING DATA (cont’d)
STEAM CAPACITIES, CALCULATIONS AND CORRECTION FACTORS
TABLE B - High Speed Fan Setting
TABLE C - Steam Correction Factors for Steam Pressure and EAT different from cataloged information
TABLE A - Low Speed Fan Setting
TABLE D - Properties of Saturated Steam
Size
Approx. Fan
rpm
MBH
Output
Leaving
Air Temp.
(LAT)
Cond.
Lbs./hr
Sq.Ft.
EDR°F °C
18/24 1,100 18 121° 50° 19 75
23/33 1,100 23 124° 51° 24 96
44/62 1,100 44 132° 56° 46 183
60/85 1,100 60 129° 54° 62 250
78/110 1,100 78 125° 52° 81 325
96/120 850 96 134° 57° 99 400
140/175 850 140 134° 57° 145 583
190/238 850 190 140° 60° 197 792
300/350 850 300 133° 56° 310 1,250
Size
Approx. Fan
rpm
MBH
Output
Leaving
Air Temp.
(LAT)
Cond.
Lbs./hr
Sq.Ft.
EDR°F °C
18/24 1,550 24 115° 46° 25 100
23/33 1,600 33 121° 49° 34 138
44/62 1,600 62 126° 52° 64 258
60/85 1,600 85 123° 50° 88 354
78/110 1,600 110 121° 50° 114 458
96/120 1,080 120 131° 55° 124 500
140/175 1,080 175 130° 55° 181 729
190/238 1,080 238 137° 58° 246 992
300/350 1,080 350 128° 53° 362 1,458
STEAM PRESSURE (PSIG)
1 1 2 4 6 8 10 15 25 50 75 100 125
STEAM PRESSURE (PSIA) 14.7 15.7 16.7 18.7 20.7 22.7 24.7 29.7 39.7 64.7 89.7 114.7 139.7
BOILING POINT OF
STEAM °F
212 215.3 218.5 224.4 229.8 234.8 239.4 249.8 266.8 297.7 320.1 337.9 352.9
VOLUME OF 1 LB. OF
STEAM CU. FT.
26.79 25.2 23.78 21.4 19.45 17.85 16.49 13.87 10.57 6.68 4.91 3.891 3.225
HEAT OF THE LIQUID
BTUH
180 183.3 186.6 192.5 198 203 207.7 218.2 235.6 267.2 290.3 308.8 324.4
L - LATENT HEAT OF
STEAM BTUH
970.4 968.2 966.2 962.4 958.8 955.5 952.5 945.5 933.6 911.2 894.2 880 867.8
TOTAL HEAT OF STEAM
BTUH
1150.4 1151.6 1152.8 1154.9 1156.3 1158.6 1160.2 1163.7 1169.2 1178.4 1184.4 1188.8 1192.2
Entering Air
Temperature
(EAT)
Steam Pressure - psi (saturated)
0 2 5 10 15 20 30 40 50 75 100 125 150
30°F -1°C 1.19 1.24 1.29 1.38 1.44 1.50 1.60 1.68 1.70 1.90 2.02 2.11 2.20
40°F 4°C 1.11 1.16 1.21 1.29 1.34 1.42 1.51 1.60 1.60 1.81 1.93 2.02 2.11
50°F 10°C 1.03 1.08 1.13 1.21 1.28 1.33 1.43 1.51 1.58 1.72 1.84 1.93 2.02
60°F 16°C 0.96 1.00 1.05 1.13 1.19 1.25 1.35 1.43 1.50 1.64 1.75 1.84 1.93
70°F 21°C 0.88 0.93 0.97 1.06 1.12 1.17 1.27 1.35 1.42 1.55 1.66 1.76 1.84
80°F 27°C 0.81 0.85 0.90 0.98 1.04 1.10 1.19 1.27 1.34 1.47 1.58 1.68 1.76
90°F 32°C 0.74 0.78 0.83 0.91 0.97 1.02 1.12 1.19 1.26 1.39 1.50 1.59 1.67
100°F 38°C 0.67 0.71 0.76 0.84 0.89 0.95 1.04 1.12 1.19 1.32 1.42 1.51 1.59