Performance
Data
UNT-PRC001-EN
28
Steam
Reheat Coils
Table PD-20. Steam Properties
Steam Pressure PSIG (kPa)
2 (14)
5 (34)
10 (69)
15 (103)
Sat. Steam Temp. F (C)
219 (104)
227 (108)
239 (115)
250 (121)
Latent Heat — BTU/LB. (kJ/kg)
965 (2240)
960 (2230)
952 (2210)
945 (2200)
Heating performance is based on 70 F (21 C) entering air temperature,
2 psig (14 kPa) and 5 psig (103 kPa) entering steam pressure.
All performance measured on high speed tap, 115 V, zero ESP, with a throwaway filter.
Table PD-21. Steam Reheat Coil With Free Discharge Motor, Group 1
2 psig
5 psig
Main
(14 kPa)
(103 kPa)
Coil
TMBH
TMBH
FC
Rows
(TkW)
(TkW)
Q/ITD
2
5.3 (2)
5.6 (2)
0.04
02
3
5.5 (2)
5.9 (2)
0.04
4
5.0 (1)
5.3 (2)
0.03
2
6.8 (2)
7.2 (2)
0.05
03
3
6.7 (2)
7.1 (2)
0.05
4
6.4 (2)
6.8 (2)
0.04
2
8.7 (3)
9.2 (3)
0.06
04
3
8.6 (3)
9.1 (3)
0.06
4
8.2 (2)
8.7 (3)
0.06
2
13.4 (4)
14.2 (4)
0.09
06
3
13.4 (4)
14.2 (4)
0.09
4
12.8 (4)
13.6 (4)
0.09
2
17.4 (5)
18.5 (5)
0.12
08
3
16.7 (5)
17.7 (5)
0.11
4
16.0 (5)
16.9 (5)
0.11
2
21.7 (6)
23.0 (7)
0.15
10
3
21.8 (6)
23.1 (7)
0.15
4
21.0 (6)
22.2 (7)
0.14
2
25.1 (7)
26.6 (8)
0.17
12
3
24.7 (7)
26.2 (8)
0.17
4
23.8 (7)
25.2 (7)
0.16
Table PD-22. Steam Reheat Coil With Free Discharge Motor, Group 2
2 psig
5 psig
Main
(14 kPa)
(103 kPa)
Coil
TMBH
TMBH
FC
Rows
(TkW)
(TkW)
Q/ITD
2
5.0 (1)
5.3 (2)
0.03
02
3
4.8 (1)
5.1 (1)
0.03
4
4.6 (1)
4.9 (1)
0.03
2
6.4 (2)
6.8 (2)
0.04
03
3
6.3 (2)
6.6 (2)
0.04
4
6.1 (2)
6.5 (2)
0.04
2
8.2 (2)
8.7 (3)
0.06
04
3
8.1 (2)
8.5 (2)
0.05
4
7.8 (2)
8.3 (2)
0.05
2
12.6 (4)
13.4 (4)
0.09
06
3
12.6 (4)
13.3 (4)
0.09
4
12.2 (4)
12.9 (4)
0.08
2
16.5 (5)
17.4 (5)
0.11
08
3
15.8 (5)
16.7 (5)
0.11
4
15.3 (4)
16.2 (5)
0.10
2
20.6 (6)
21.8 (6)
0.14
10
3
20.6 (6)
21.8 (6)
0.14
4
20.0 (6)
21.1 (6)
0.14
2
23.7 (7)
25.1 (7)
0.16
12
3
23.4 (7)
24.7 (7)
0.16
4
22.7 (7)
24.0 (7)
0.15
Note:
1. Medium and low speed capacities are approximately 80 percent and 60 percent respectively of the high speed capacity.
2. Q/ITD = MBH (kW)/(Saturated steam temperature - Entering air temperature). To determine heating capacities at different
entering steam pressure or entering air temperature, compute the new ITD and multiply it by the Q/ITD shown. (See the Steam
Properties table at the end of this section to determine the saturated steam temperatures at various entering steam pressures.)
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