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CHAPTER 7 Capstone PERFORMANCE CHAPTER 7: PERFORMANCE The information in this section is intended to provide guidance for estimating the performance characteristics of Capstone C200 microturbines under different operating conditions of temperature, elevation, load, inlet restriction, and exhaust back pressure. Power Output Gas turbines are often called “mass flow devices” due to the fact that they take in significantly more air than is required for stoichiometric combustion. This results in a thermodynamic cycle that is dependent on air density effects of temperature and elevation. Microturbine systems have been designed with this characteristic in mind, and the size and capability of the generator and associated power electronics are matched to the micro gas turbine output. The industry standard for gas turbines is to publish their nameplate rated output based on ISO condition of 15 C (59 F) and 60% relative humidity at sea level. Capstone microturbines take the high frequency output of the generator that is connected to a common shaft with the gas turbine power section and use power electronics to rectify it to DC, and then invert back to useable AC power at 50 or 60Hz. Since the generator windings and power electronics outputs are limited by their current carrying capacity, the net microturbine power output is typically maintained at some maximum level as temperature decreases, even though the gas turbine could produce additional power. Figure 7-1 shows an example of the published power output of a Capstone 200kW microturbine system as a function of temperature. 410066 Rev C (June 2009) 7-1 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | CAPSTONE C200 MICROTURBINE TECHNICAL REFERENCE
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