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Federal Technology Alert Table 1. Microturbine performance characteristics at various power settings (Ref. 2) adjusting the turbine speed to achieve the desired power output setting at the given ambient temperature. The maximum speed allowed by the MTG controller is 96,000 rpm, which limits possible temperature compensation. At a given ambient temperature when the maximum turbine speed limit is reached for a specific power output setting, it is not possible to compensate for any further increases in ambient temperature. Therefore the net power output of the MTG decreases as the ambient temperature increases, and the desired power output setting cannot be achieved. For the tested microturbine, the maximum speed limit was found to affect only the 30-kW and 25-kW power settings. As can be seen in Fig. 9, at the 30-kW and 25-kW output settings the critical ambient temperature is ~13oC (~56oF) and ~21oC (~70oF), respectively. The effect of ambient air temperature on exhaust gas temperature is shown in Fig. 10: exhaust gas temperature increases with the rise in ambient air temperature. After the critical temperature is reached, the exhaust gas temperature continues to increase with increased ambient temperature, but at a lower rate.6 4. BACK-PRESSURE TESTS1–3 For a turbine-only configuration, the back-pressure (i.e., pressure at the turbines exhaust outlet) consists of the pressure drop through the exhaust stack and silencers. Heat recovery equipment interfaced with a turbine increases the back-pressure and reduces the power output. The objective of this test was to investigate the dependence of the microturbine’s power and efficiency on the exhaust back-pressure. Two series of back-pressure tests were performed; one at constant output power demand and another at constant engine speed. In each series of tests, the total power output demand of the microturbine was varied in increments of 5 kW from 10 kW to 30 kW. The back-pressure on the unit was adjusted by a slide damper in the exhaust duct, as shown in Fig. 11. Constant output power demand tests were performed with the damper in three different 10 –– FEDERAL ENERGY MANAGEMENT PROGRAM .PDF Image | Summary of Results from Testing a 30-kW-Microturbine and Combined Heat and Power (CHP) System
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