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Figure 2.5 Flow sheet of the ORC-CHP plant at Admont, [21] System Performance In February 1999 test runs where preformed. The test runs showed that the efficiency for the water boiler and the thermal oil boiler amounted to 89% and 70 -75% respectively. Taking the flue gas condenser into consideration an overall thermal efficiency of 90% was achieved for the whole CHP plant. For the ORC unit it was discovered that the nominal power output of 400 kWel could be achieved with lower thermal oil temperatures (>300 °C) than anticipated. The electric efficiency of the ORC was measured to 18%. This efficiency was also achieved on partial loads down to 50% of the nominal load, which is important since it is a heat controlled CHP plant. The overall efficiency of the ORC-cycle amounts to about 98%, [21]. Technical details are presented in Table 2.5. The reliability of the plant is relatively good compared to other CHP techniques, between the year 1999 and 2005 the ORC unit reached 48000 hours of trouble free operation, except for a small number of hours stops, due to minor problems, [13]. An energy balance for the Admont plant can be found in Appendix C. Table 2.5 Technical data for ORC- Admont Process Pel Pth Pfuel α ηtot ηmarg ηel ηTh [kW] 400 [kW] 3480 [kW] 5425 [%]11 [%] 72 [%] 26 [%] 7 [%] 64 18PDF Image | Biomass Based Small Scale Combined Heat and Power Tech
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