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UNT-PRC001-EN28
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.)