Specification
1-150.15
11
PERFORMANCE DATA
Steam Conversion Tables
Table 11.1 and the formulas below are used to determine the air temperature rise of a unit heater at a steam pressure and/or
entering air temperature other than standard conditions of 2 lb. steam, 60°F entering air temperature.
Table 11.1
Air Temperature Rise Conversion Factors
Unit Steam Entering Air Temperature (°F)
Heater Pressure
Type (PSIG)
0 1.33 1.28 1.24 1.17 1.12 1.07 1.01 0.96 0.90 0.84 0.78 0.72
2 1.38 1.33 1.27 1.22 1.17 1.11 1.06 1.00 0.94 0.88 0.83 0.76
5 1.43 1.38 1.33 1.27 1.21 1.16 1.11 1.05 1.00 0.93 0.88 0.82
10 1.50 1.45 1.40 1.35 1.29 1.24 1.19 1.13 1.07 1.02 0.95 0.90
15 1.56 1.51 1.46 1.42 1.36 1.31 1.24 1.19 1.14 1.08 1.02 0.97
20 1.61 1.56 1.52 1.46 1.41 1.36 1.30 1.25 1.19 1.14 1.08 1.02
30 1.70 1.65 1.61 1.55 1.51 1.46 1.40 1.35 1.29 1.24 1.18 1.12
40 1.78 1.73 1.68 1.62 1.58 1.54 1.48 1.43 1.38 1.32 1.26 1.21
50 1.84 1.79 1.74 1.69 1.65 1.60 1.55 1.50 1.45 1.39 1.33 1.28
60 1.91 1.86 1.81 1.75 1.71 1.66 1.61 1.56 1.50 1.45 1.40 1.33
70 1.95 1.91 1.86 1.81 1.76 1.71 1.66 1.61 1.56 1.51 1.45 1.39
75 1.97 1.93 1.89 1.84 1.79 1.74 1.69 1.64 1.58 1.53 1.47 1.42
80 2.00 1.95 1.91 1.86 1.82 1.76 1.72 1.66 1.61 1.56 1.49 1.44
90 2.04 2.00 1.95 1.90 1.86 1.81 1.75 1.70 1.65 1.60 1.54 1.49
100 2.08 2.04 1.99 1.95 1.89 1.85 1.79 1.75 1.69 1.64 1.59 1.53
125 2.17 2.13 2.09 2.04 1.99 1.94 1.89 1.84 1.79 1.74 1.68 1.63
150 2.25 2.21 2.17 2.12 2.07 2.03 1.98 1.93 1.87 1.83 1.77 1.71
0 1.36 1.31 1.25 1.19 1.13 1.08 1.02 0.96 0.90 0.84 0.78 0.72
2 1.41 1.35 1.29 1.24 1.18 1.12 1.06 1.00 0.94 0.88 0.82 0.76
5 1.46 1.40 1.35 1.29 1.23 1.17 1.12 1.06 1.00 0.94 0.88 0.82
10 1.54 1.48 1.43 1.37 1.31 1.25 1.20 1.14 1.08 1.02 0.96 0.89
15 1.61 1.55 1.49 1.44 1.38 1.32 1.26 1.20 1.14 1.09 1.02 0.97
20 1.67 1.61 1.55 1.50 1.44 1.38 1.32 1.26 1.20 1.15 1.08 1.02
30 1.77 1.71 1.65 1.60 1.54 1.48 1.42 1.36 1.30 1.25 1.18 1.12
40 1.85 1.79 1.74 1.68 1.62 1.56 1.51 1.45 1.39 1.33 1.27 1.21
50 1.92 1.86 1.81 1.75 1.69 1.64 1.58 1.52 1.46 1.40 1.34 1.28
60 1.99 1.93 1.88 1.82 1.76 1.70 1.65 1.58 1.53 1.47 1.41 1.35
70 2.05 1.99 1.94 1.88 1.82 1.76 1.70 1.65 1.59 1.53 1.47 1.41
75 2.08 2.02 1.96 1.91 1.85 1.79 1.73 1.67 1.62 1.56 1.50 1.43
80 2.10 2.04 1.99 1.93 1.87 1.81 1.75 1.70 1.64 1.58 1.52 1.46
90 2.15 2.09 2.04 2.00 1.92 1.86 1.80 1.74 1.69 1.63 1.57 1.51
100 2.19 2.14 2.08 2.02 1.97 1.91 1.85 1.79 1.73 1.67 1.61 1.55
125 2.29 2.24 2.18 2.12 2.07 2.01 1.95 1.89 1.83 1.77 1.71 1.65
150 2.39 2.33 2.27 2.22 2.16 2.10 2.04 1.99 1.93 1.87 1.81 1.75
175 2.46 2.41 2.35 2.29 2.24 2.18 2.12 2.06 2.00 1.94 1.88 1.82
200 2.54 2.48 2.42 2.37 2.31 2.25 2.19 2.13 2.07 2.02 1.96 1.89
225 2.60 2.54 2.49 2.43 2.37 2.32 2.26 2.20 2.14 2.08 2.02 1.96
250 2.66 2.60 2.55 2.49 2.43 2.38 2.32 2.26 2.20 2.14 2.08 2.02
Applicable formulas (examples on page 15):
To find actual air temperature rise of unit heater when operated at non-standard (actual) conditions:
ATR
A
= (FAT
S
- EAT
S
) x Air Temperature Rise Factor
To find actual final air temperature of unit heater when operated at non-standard (actual) conditions:
FAT
A
= EAT
A
+ ATR
A
Where:
EAT
S
= Standard conditions entering air temperature (60°F)
EAT
A
= Non-standard (actual) entering air temperature
FAT
S
= Final air temperature at standard conditions from Tables 13.1 through 14.2
FAT
A
= Final air temperature at non-standard (actual) conditions
ATR
A
= Air temperature rise at non-standard (actual) conditions
Horizontal Delivery
Vertical Delivery and Power-Throw
-10 0 10 20 30 40 50 60 70 80 90 100