Capstone Turbine Corporation
Model C65 Hybrid UPS User’s Manual
400027 Rev A (July 2010)
Page
13 of 66
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.
•
Only one moving part. No gears, belts, or turbine-driven accessories.
•
Advanced combustion control provides ultra-low emissions.
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The integral annular recuperator (heat exchanger) doubles thermal efficiency.
•
Digital control technology facilitates advanced control and diagnostic capabilities,
both on-board and remotely.
MicroTurbine Engine
The MicroTurbine engine is a combustion turbine that includes a compressor, combustor,
turbine, generator, and a recuperator. The rotating components are mounted on a single
shaft supported by patented air bearings and spin at up to 96,000 RPM. The permanent
magnet generator is cooled by the airflow into the MicroTurbine. The output of the
generator is variable voltage, variable frequency AC. The generator is used as a motor
during start-up and cooldown cycles.
Power Electronics
Digital power electronics control the MicroTurbine system operation and all subsystem
operations. The digital power electronics change the variable frequency AC power from
the generator to DC voltage, and then to constant frequency AC current.
During start up, the digital power electronics operate as a variable frequency drive, driving
the generator as a motor until the MicroTurbine has reached ignition and power is
available from the MicroTurbine. The digital power electronics again operate the generator
as a motor during cooldown to remove heat stored in the recuperator and within the
MicroTurbine engine in order to protect the system components.
Air Bearings
The MicroTurbine utilizes gas foil bearings (air bearings) for high-reliability, low
maintenance, and safe operation. This allows fewer parts and the absence of any liquid
lubrication to support the rotating group. When the MicroTurbine is in operation, a gas film
separates the shaft from the bearings and protects them from wear.
Fuel System
The MicroTurbine can efficiently use a wide range of approved hydrocarbon-based
gaseous fuels, depending on the model. The MicroTurbine includes an integral fuel
delivery and control system. The standard system is designed for pressurized
hydrocarbon-based gaseous fuels. Other models are available for low-pressure gaseous
fuels and liquid fuels. Contact your Capstone Authorized Service Provider for data on
approved fuels and performance specifications.
Emissions
The Capstone MicroTurbine is designed to produce very clean emissions. The exhaust is
clean and oxygen rich (approximately 18% O
2
) with very low levels of air pollutants. Like
all fuel combustion technology, the MicroTurbine can produce dangerous emissions (like
nitrogen dioxide and carbon monoxide) from the fuel combustion process. The
MicroTurbine has ultra low nitrogen dioxide (NO
2
) and carbon monoxide (CO) emission
levels.
