Specification
1-150.16
10
PERFORMANCE DATA
Steam Conversion Tables
Table 10.1 and the formulas below are used to determine the heating capacity (Btu/hr) 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 10.1
Steam Heating Capacity Conversion Factors
Unit Steam Entering Air Temperature (°F)
Heater Pressure
Type (PSIG)
0 1.54 1.45 1.37 1.27 1.19 1.11 1.03 0.96 0.88 0.81 0.74 0.67
2 1.59 1.50 1.41 1.32 1.24 1.16 1.08 1.00 0.93 0.85 0.78 0.71
5 1.64 1.55 1.46 1.37 1.29 1.21 1.13 1.05 0.97 0.90 0.83 0.76
10 1.73 1.64 1.55 1.46 1.38 1.29 1.21 1.13 1.06 0.98 0.91 0.84
15 1.80 1.71 1.61 1.53 1.44 1.34 1.28 1.19 1.12 1.04 0.97 0.90
20 1.86 1.77 1.68 1.58 1.50 1.42 1.33 1.25 1.17 1.10 1.02 0.95
30 1.97 1.87 1.78 1.68 1.60 1.51 1.43 1.35 1.27 1.19 1.12 1.04
40 2.06 1.96 1.86 1.77 1.68 1.60 1.51 1.43 1.35 1.27 1.19 1.12
50 2.13 2.04 1.94 1.85 1.76 1.67 1.58 1.50 1.42 1.34 1.26 1.19
60 2.20 2.09 2.00 1.90 1.81 1.73 1.64 1.56 1.47 1.39 1.31 1.24
70 2.26 2.16 2.06 1.96 1.87 1.78 1.70 1.61 1.53 1.45 1.37 1.29
75 2.28 2.18 2 09 1.99 1.90 1.81 1.72 1.64 1.55 1.47 1.40 1.32
80 2.31 2.21 2.11 2.02 1.93 1.84 1.75 1.66 1.58 1.50 1.42 1.34
90 2.36 2.26 2.16 2.06 1.97 1.88 1.79 1.71 1.62 1.54 1.46 1.38
100 2.41 2.31 2.20 2.11 2.02 1.93 1.84 1.75 1.66 1.58 1.50 1.42
125 2.51 2.41 2.31 2.21 2.11 2.02 1.93 1.84 1.76 1.68 1.59 1.51
150 2.60 2.50 2.40 2.30 2.20 2.11 2.02 1.93 1.84 1.76 1.67 1.59
0 1.49 1.41 1.33 1.25 1.18 1.11 1.03 0.96 0.90 0.83 0.76 0.69
2 1.52 1.45 1.37 1.29 1.22 1.15 1.07 1.00 0.93 0.86 0.80 0.73
5 1.58 1.50 1.42 1.34 1.27 1.20 1.12 1.05 0.98 0.91 0.85 0.78
10 1.64 1.57 1.49 1.41 1.34 1.27 1.19 1.12 1.05 0.98 0.91 0.85
15 1.70 1.62 1.55 1.47 1.40 1.32 1.25 1.18 1.11 1.04 0.97 0.90
20 1.75 1.67 1.60 1.52 1.45 1.37 1.30 1.23 1.16 1.09 1.02 0.96
30 1.83 1.75 1.68 1.61 1.53 1.46 1.39 1.32 1.25 1.18 1.11 1.04
40 1.90 1.82 1.75 1.68 1.61 1.53 1.46 1.39 1.32 1.25 1.18 1.11
50 1.96 1.87 1.81 1.74 1.67 1.59 1.52 1.45 1.38 1.31 1.24 1.17
60 2.02 1.94 1.87 1.79 1.72 1.64 1.57 1.50 1.43 1.36 1.29 1.22
70 2.07 1.99 1.92 1.84 1.76 1.69 1.62 1.55 1.47 1.40 1.33 1.27
75 2.10 2.02 1.94 1.86 1.79 1.71 1.64 1.57 1.49 1.42 1.36 1.29
80 2.11 2.04 1.96 1.88 1.80 1.73 1.66 1.59 1.51 1.44 1.38 1.31
90 2.15 2.08 2.00 1.92 1.84 1.77 1.69 1.62 1.55 1.48 1.41 1.34
100 2.19 2.11 2.03 1.95 1.88 1.80 1.73 1.66 1.59 1.52 1.45 1.38
125 2.27 2.19 2.11 1.99 1.91 1.88 1.81 1.74 1.67 1.60 1.53 1.46
150 2.34 2.26 2.18 2.10 2.03 1.95 1.88 1.81 1.74 1.67 1.60 1.53
175 2.40 2.32 2.24 2.16 2.09 2.01 1.94 1.87 1.80 1.73 1.66 1.59
200 2.45 2.37 2.29 2.22 2.14 2.07 1.99 1.92 1.85 1.78 1.71 1.64
225 2.50 2.42 2.34 2.26 2.19 2.12 2.04 1.97 1.90 1.83 1.76 1.69
250 2.54 2.46 2.38 2.31 2.23 2.16 2.09 2.01 1.94 1.87 1.80 1.73
Applicable formulas (examples on page 15):
To find actual unit heater capacity when operated at non-standard (actual) conditions:
Btu
A
= Btu
S
x Heating Capacity Factor
To select a heater capacity based on standard conditions to meet a heating capacity at non-standard (actual) conditions:
Btu
S
= Btu
A
÷ Heating Capacity Factor
Where:
Btu
S
= Capacity at standard conditions (2 lb. steam, 60°F entering air temperature) from Tables 13.1 through 14.2
Btu
A
= Capacity at non-standard (actual) conditions
Horizontal Delivery
Vertical Delivery and Power-Throw
-10 0 10 20 30 40 50 60 70 80 90 100