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Federal Technology Alert efficiency of ~23%. At an output power setting of 5 kW, the microturbine has an efficiency of only ~12%. The microtur bine’s exhaust temperature varied from ~264°C (~508°F) at the unit’s maximum power demand setting (30 kW) to ~196°C (~384°F) at the minimum power setting of 5 kW. The energy efficiency and exhaust temperature of the microturbine as they vary with power output are shown in Fig. 8. 3.4 EFFECT OF AMBIENT TEMPERATURE ON ACHIEVABLE POWER OUTPUT AND EXHAUST TEMPERATURE4 One of the factors affecting the perfor mance of the turbine is the ambient air mass flow. Since a turbine is a fixed-displacement machine, the air mass flow is a direct function of the ambient air den sity, which in turn is a function of the ambi ent air temperature and humidity. The tested microturbine generator (MTG) controls the net power output by Fig. 6. Power dispatching response: power output and turbine speed. (Source: “DER Performance Testing of a Microturbine-Based Combined Cooling, Heating, and Power (CHP) System,” Proceedings of Power System 2002 Conference, Clemson, SC, March 2002. Fig. 7. Microturbine power output variation for 1 h at 30 kW. (Source: “Integration of Distributed Energy Resources and Thermally-Activated Technologies,” DistribuTech Conference, Miami Beach, FL, February 2002.) FEDERAL ENERGY MANAGEMENT PROGRAM –– 9PDF Image | Summary of Results from Testing a 30-kW-Microturbine and Combined Heat and Power (CHP) System
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