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Table 26.
STEAM CALCULATIONS AND CORRECTION FACTORS P STYLE
I. CAPACITY
A. For 2 lbs. steam, 60° entering air
B. For higher steam pressures and/or E.A.T.'s above
or below 60°F
II. FINAL AIR TEMPERATURE
A. For 2 lbs. steam, 60° entering air
B. For capacities calculated in I.B. (above)
III. FINAL AIR VOLUME
A. For 2 lbs. steam, 60° entering air
B. For final air temperatures calculated In II. B.
(above)
IV. CONDENSATE PER HOUR
A. For 2 lbs. steam, 60° entering air
B. For capacities calculated in I.B. (above)
Table 27.
STEAM CORRECTION FACTORS BASED ON 2 LBS. STEAM 60° E.A.T.
ENTERING
AIR TEMP
0
2
°F (°C)
(.0)
(13.8)
30° (-1°)
1.18
1.22
40° (4°)
1.11
1.15
50° (10°)
1.03
1.07
60° (16°)
0.96
1.00
70° (21°)
0.90
0.93
80° (27°)
0.83
0.86
90° (32°)
0.76
0.80
100° (38°)
0.69
0.73
Table 28.
PROPERTIES OF SATURATED STEAM
Steam Temperature-°F (°C)
(100.0)
Latent Heat of Steam-Btu/
lbm (KJ/Kg)
(2256)
Note: Ratings apply only to free inlet and discharge without diffusers.
Note: All motors are constant speed and operate at top speed as indicated in motor data. Models 42 through 102 can
be run at reduced speed with addition of optional variable speed switch. This switch is factory-calibrated for low
and high speed ratings, with intermediate speeds in?nitely controllable. Models 166 through 720 operate at
constant speed as indicated in motor data.
Note: For specific motor data refer to motor specifications in
Note: To correct for entering air temperatures, use 1° temperature rise for each foot in mounting height. As an
example, 60° air is r equired at work area (5 ft. above ?oor) units are to be mounted at (20 ft.) above floor.
Mounting height (20 ft.) minus work height (5 ft.) equals differential (15 ft.) or, 15° rise in air temperature at unit
air inlet. Correct for actual inlet air temperature of 75° (60° + 15° = 75° E.A.T.) on
UH-SVX01A-EN
Steam Performance Data
Read output directly from
HR.
Multiply output from
correction factor from
Read temperature directly from
Output from I.B./1.085 x CFM from
E.A.T. = Final Air Temp
460 + Final Air Temp from
CFM from
460 + Final Air Temp from II.B./530 x Nom. CFM
from
Table 24
Read lbs. per hour from
Output from I.B./Latent Heat From
per hour of condensate
STEAM PRESSURE - LBS. PER SQ. IN. (SATURATED)
5
10
15
(34.5)
(68.9)
(103.4)
1.27
1.34
1.40
1.20
1.27
1.32
1.12
1.19
1.25
1.05
1.12
1.18
0.98
1.05
1.11
0.91
0.98
1.04
0.85
0.91
0.97
0.78
0.85
0.90
STEAM PRESSURE IN LBS. PER SQUARE INCH GAUGE
0 (.0)
2 (13.8) 5 (34.5) 10 (68.9) 15 (103.4) 20 (137.9) 30 (206.8) 40 (275.8) 50 (344.7) 75 (517.1)
212.0
218.5
227.1
239.4
(103.6)
(108.4)
(115.2)
970
966
961
953
(2247)
(2235)
(2217)
Table
24: 41,300 BTU/
Table 24
by appropriate
Table
27.
Table
24: 124°F.
Table 24
Table 24
530 x Nom.
Table 24
= Final Air Volume
= Final Air Volume
Table
24: 43 LBS./HR.
Table 28
20
30
40
(137.9)
(206.8)
(275.8)
1.45
1.53
1.61
1.37
1.46
1.53
1.30
1.39
1.46
1.23
1.32
1.39
1.16
1.25
1.32
1.09
1.18
1.25
1.02
1.11
1.18
0.96
1.04
1.11
249.8
258.8
(121.0)
(126.0)
946
940
(2200)
(2186)
Table 16
and
Table
EXAMPLE:
UNIT SIZE __________ 042
Steam Pressure _____10 PSI
Entering Air Temp. ____ 40°F
41,300 x 1.27 = 52,451 BTU/HR.
+
52,451/1.085 x 595 + 40 = 121.0°F
460 + 124/530 x 595 = 655 CFM
460 + 121.0/530 x 595 = 652 CFM
= lbs.
52,451/953 = 55.0 LBS./HR.
50
75
(344.7)
(517.1)
1.67
1.79
1.59
1.71
1.52
1.64
1.45
1.57
1.38
1.49
1.31
1.42
1.24
1.36
1.17
1.29
274.0
286.7
297.7
(134.4)
(141.5)
(147.6)
929
920
912
(2161)
(2140)
(2121)
17.
Table
6.
319.9
(159.9)
891
(2072)
45
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