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UH-SVX01A-EN 45
Steam Performance Data
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 Tab le 16 and Tabl e 17.
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 Ta ble 6 .
Table 26. STEAM CALCULATIONS AND CORRECTION FACTORS P STYLE
EXAMPLE:
UNIT SIZE __________ 042
Steam Pressure _____10 PSI
Entering Air Temp. ____ 40°F
I. CAPACITY
A. For 2 lbs. steam, 60° entering air
Read output directly from Table 24: 41,300 BTU/
HR.
B. For higher steam pressures and/or E.A.T.'s above
or below 60°F
Multiply output from Table 24 by appropriate
correction factor from Table 27.
41,300 x 1.27 = 52,451 BTU/HR.
II. FINAL AIR TEMPERATURE
A. For 2 lbs. steam, 60° entering air
Read temperature directly from Table 24: 124°F.
B. For capacities calculated in I.B. (above) Output from I.B./1.085 x CFM from Table 24 +
E.A.T. = Final Air Temp
52,451/1.085 x 595 + 40 = 121.0°F
III. FINAL AIR VOLUME
A. For 2 lbs. steam, 60° entering air
460 + Final Air Temp from Table 24 530 x Nom.
CFM from Table 24 = Final Air Volume
460 + 124/530 x 595 = 655 CFM
B. For final air temperatures calculated In II. B.
(above)
460 + Final Air Temp from II.B./530 x Nom. CFM
from Table 24 = Final Air Volume
460 + 121.0/530 x 595 = 652 CFM
IV. CONDENSATE PER HOUR
A. For 2 lbs. steam, 60° entering air
Read lbs. per hour from Table 24: 43 LBS./HR.
B. For capacities calculated in I.B. (above) Output from I.B./Latent Heat From Table 28 = lbs.
per hour of condensate
52,451/953 = 55.0 LBS./HR.
Table 27. STEAM CORRECTION FACTORS BASED ON 2 LBS. STEAM 60° E.A.T.
ENTERING
AIR TEMP
°F (°C)
STEAM PRESSURE - LBS. PER SQ. IN. (SATURATED)
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)
30° (-1°) 1.18 1.22 1.27 1.34 1.40 1.45 1.53 1.61 1.67 1.79
40° (4°) 1.11 1.15 1.20 1.27 1.32 1.37 1.46 1.53 1.59 1.71
50° (10°) 1.03 1.07 1.12 1.19 1.25 1.30 1.39 1.46 1.52 1.64
60° (16°) 0.96 1.00 1.05 1.12 1.18 1.23 1.32 1.39 1.45 1.57
70° (21°) 0.90 0.93 0.98 1.05 1.11 1.16 1.25 1.32 1.38 1.49
80° (27°) 0.83 0.86 0.91 0.98 1.04 1.09 1.18 1.25 1.31 1.42
90° (32°) 0.76 0.80 0.85 0.91 0.97 1.02 1.11 1.18 1.24 1.36
100° (38°) 0.69 0.73 0.78 0.85 0.90 0.96 1.04 1.11 1.17 1.29
Table 28. PROPERTIES OF SATURATED STEAM
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)
Steam Temperature-°F (°C) 212.0
(100.0)
218.5
(103.6)
227.1
(108.4)
239.4
(115.2)
249.8
(121.0)
258.8
(126.0)
274.0
(134.4)
286.7
(141.5)
297.7
(147.6)
319.9
(159.9)
Latent Heat of Steam-Btu/
lbm (KJ/Kg)
970
(2256)
966
(2247)
961
(2235)
953
(2217)
946
(2200)
940
(2186)
929
(2161)
920
(2140)
912
(2121)
891
(2072)