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SRI/USEPA-GHG-VR-27 September 2003 the CHP system tested are a Capstone 60 MicroTurbineTM and a Unifin International heat exchanger. This verification statement provides a summary of the test results for the CHP system. TECHNOLOGY DESCRIPTION Large- and medium-scale gas-fired turbines have been used to generate electricity since the 1950s. Technical and manufacturing developments during the last decade have enabled the introduction of microturbines with generation capacities ranging from 30 to 200 kW. The CHP system tested here is a cogeneration installation that integrates microturbine technology with a heat-recovery system. The following description of the CHP system tested is based on information provided by CDH Energy and the equipment vendors and does not represent verified information. Electric power is generated by a Capstone 60 microturbine with a nominal power output of 60 kW (59 °F, sea level). The system operates on natural gas and consists of an air compressor, recuperator, combustor, turbine, and a permanent magnet generator. Preheated air is mixed with fuel and this compressed fuel/air mixture is burned in the combustor under constant pressure conditions. The resulting hot gas is allowed to expand through the turbine section to perform work, rotating the turbine blades to turn a generator which produces electricity. The need for a gearbox and associated moving parts is eliminated because of the inverter-based electronics that enable the generator to operate at high speeds and frequencies. The rotating components are mounted on a single shaft supported by patented air bearings that rotate at over 96,000 revolutions per minute (rpm) at full load. The exhaust gas exits the turbine and enters the recuperator that pre-heats the air entering the combustor to improve the efficiency of the system. The exhaust gas is then directed to the Unifin heat-recovery unit. The Unifin is a fin-and-tube heat exchanger (Model MG2) suitable for up to 700 °F exhaust gas. A nominal 25-percent mixture of propylene glycol (PG) in water is used as the heat-transfer media to recover energy from the microturbine exhaust gas stream. The PG fluid is circulated at a rate of up to 50 gallons per minute (gpm). A digital controller monitors the PG fluid outlet temperature and, when the temperature exceeds the user set point, a damper automatically opens and allows the hot exhaust gas to bypass the heat exchanger and release the heat through the stack. The damper allows hot gas to circulate through the heat exchanger when heat recovery is required (i.e., the PG fluid outlet temperature is less than user setpoint). This design allows the system to protect the heat recovery components from the full heat of the turbine exhaust while still maintaining full electrical generation from the microturbine. The generator produces high-frequency alternating current which is rectified, inverted, and filtered by the line power unit into conditioned 480-volts alternating current (VAC). The unit supplies an electrical frequency of 60 hertz (Hz) and is supplied with a control system which allows for automatic and unattended operation. An active filter in the generator is reported by the turbine manufacturer to provide power that is free of spikes and unwanted harmonics. All operations, including startup, setting of programmable interlocks, grid synchronization, operational setting, dispatch, and shutdown, can be performed either manually or remotely using an internal power controller system. This CHP system also incorporates a Copeland-Scroll Model SZN22C1A gas booster compressor with a nominal volume capacity of 29 standard cubic feet per minute (scfm) and the capability of compressing natural gas from inlet pressures of 0.25 to 15 pounds per square inch gauge (psig) to outlet pressures of 60 to 100 psig. The verification of the Capstone 60 microturbine system was conducted at a 57,000-sq ft Waldbaums Supermarket constructed in 2002. The store uses energy-efficient T4 light fixtures so the load in the sales S-2PDF Image | Environmental Technology Verification Report
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