Page 366 - Sustainable On-Site CHP Systems Design, Construction, and Operations

Fort Bragg CHP 339

Unrecovered
turbine energy
System boundary for analysis
Other Exhaust ID
losses fan and
damper Cooling
output

Exhaust-driven absorption chiller
exhaust (To inlet
Energy air coil)
input
Gas
(fuel) Heating
Gas output Useful
compressor Exhaust energy
Inlet-air Bypass output
cooling diverter Duct HRSG
burner

Parasitic losses Electrical
Fuel input (gas compressor output
• Gas Turbine generator and exhaust ID fan)
• Fuel oil

FIGURE 20-3 CHP system boundaries for performance analysis.

30
25
20
15
10
5
0
June July Aug Sept Oct Nov Dec Jan Feb March April May June July Aug
5
6
2
6
Turbine runtime (10 h) Power generated (10 kWh) Steam generated (10 Ib) Absorption chiller output (10 ton-h)
FIGURE 20-4 Energy delivery results, June 2004 through August 2005.

prepared by the Association of State Energy Research and Technology Transfer
Institutions (ASERTTI). Seasonal energy efficiency is noted monthly in this sec-
tion and quarterly in the subsequent.

Overall Energy Utilization
A high-level summary of energy utilization is shown in Table 20-3. Input and output
energy fluctuations reflect changes in utility prices and seasonal climate changes.