Page 92 - Handbook of Energy Engineering Calculations

scale. In these instances, a single thin line is used. The completed diagram,
Fig. 17, provides a useful concept of the distribution of the energy in the
cycle.

FIGURE 17 Energy-flow chart of cycle in Fig. 15.

Related Calculations. The procedure given here can be used for all

regenerative cycles, provided that the equations are altered to allow for more,
or fewer, heaters and pumps. The following calculation procedure shows the
application of this method to an actual regenerative cycle.

BLEED REGENERATIVE STEAM CYCLE ANALYSIS

Analyze the bleed regenerative cycle shown in Fig. 18, determining the heat
balance for each heater, plant thermal efficiency, turbine or engine thermal
efficiency, plant heat rate, turbine or engine heat rate, and turbine or engine

2
steam rate. Throttle steam pressure is 2000 lb/in (abs) (13,790.0 kPa) at
1000°F (537.8°C); steam-generator efficiency = 0.88; station auxiliary steam
consumption (excluding pump work) = 6 percent of the turbine or engine

output; engine efficiency of each turbine or engine section = 0.80; turbine or
engine cycle has three feedwater heaters and bleed-steam pressures as shown
in Fig. 18; exhaust pressure to condenser is 1 inHg (3.4 kPa) absolute.