MIL-HDBK-1003/7
Table 8
Theoretical Steam Rates
LB/KWH
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* Pin,PSIG
1600 *
100
200
250
400
600
850
1250
1450
* Tin,F
1000 *
Sat.
Sat.
550
750
825
900
950
1000
*
*
* Exhaust. P
*
*
* 1" HGA
10.20
9.17 8.09
6.85
6.34
5.92
5.62
5.43
5.40
* 2" HGA
*
11.31 10.02 8.78
7.36
6.76
6.28
5.94
5.73
5.69
* 3" HGA
*
12.12 10.62 9.27
7.71
7.05
6.53
6.16
5.93
5.89
*
* 0 PSIG
22.73 17.52 14.57 11.19
9.82
8.81
8.10
7.72
7.62
* 5 PSIG
*
26.07 19.35 15.90 11.99 10.42
9.29
8.49
8.07
7.96
*
* 10 PSIG
29.52 21.10 17.15 12.71 10.96
9.71
8.83
8.38
8.26
* 15 PSIG
*
33.20 22.83 18.35 13.38 11.44 10.08
9.14
8.66
8.52
* 20 PSIG
*
37.17 24.56 19.53 14.02 11.90 10.43
9.42
8.91
8.76
*
* 25 PSIG
41.56 26.31 20.70 14.63 12.34 10.76
9.68
9.14
8.98
* 50 PSIG
*
74.8 35.99 26.75 17.56 14.31 12.22 10.80 10.15
9.94
*100 PSIG
*
66.6 42.40 23.86 18.07 14.77 12.65 11.78 11.46
*
*150 PSIG
71.8 31.93 22.15 17.33 14.35 13.26 12.79
*200 PSIG
*
43.51 26.96 20.05 16.05 14.72 14.08
*300 PSIG
*
40.65 26.53 19.66 17.74 16.70
*
*400 PSIG
78.3 35.43 23.82 21.10 19.52
*500 PSIG
*
49.03 28.87 25.03 22.69
*600 PSIG
*
73.1 35.30 29.79 26.35
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The equation for the theoretical steam rate is as follows:
EQUATION:
T.S.R. = 3413/(h1 - h2)
(1)
where:
T.S.R. = theoretical steam rate of the turbine, lb/kWh
h1 = throttle enthalpy at the throttle pressure and
temperature, Btu/lb
based on isentropic expansion, Btu/1b.
Turbine Generator Engine Efficiency. The engine efficiency is an overall
5.1.8.2
efficiency and includes the entire performance and mechanical and electrical losses of
the turbine and generator. The engine efficiency can be calculated using the following
equation:
EQUATION:
ne =
(h1 - he)ntng/(h1 - h2)
(2)
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