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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Glossary of Terms and Acronyms PSIA – Pounds per square inch absolute. Equal to psig (gauge) + atmospheric pressure. PSIG – Pounds per square inch gauge. 0 psig = atmospheric pressure (14.7 psi at sea level). 1 psig = 27.707 inches of water (at 59 °F). PV – Proportional Valve. PWM – Pulse Width Modulation. A control technique that varies the duty cycle of a digital electrical waveform to effect a change in an average value of an analog variable. RAW EMISSIONS – Emissions that are as measured from the exhaust duct, expressed on a dry volumetric basis in parts per million. REACTANCE – Opposition of flow of alternating current in an A/C circuit. RECUPERATOR – A heat exchanger design to recover waste heat in the turbine exhaust to heat Pcd air prior to introduction into the combustion process. The use of a recuperator increases overall system thermal efficiency. Less fuel is required to be burned to reach the required Turbine Inlet Temperature (T.I.T.). REMOTE MONITORING – Accessing MicroTurbines via telephone, cellular, satellite, cable or other communication methods to control, monitor or troubleshoot a unit or MultiPac. REPAIR PARTS – A subset of service parts. Parts or components that are used to perform unscheduled repair service on the MicroTurbine. RESISTANCE – Opposition to the flow of current in an electrical circuit. Basic unit is ohm. RET – Recuperator Exit Temperature RFC – Rotary Flow Compressor. Used to increase the pressure of the gas upstream of the combustion process. The RFC also regulates the fuel flow requirements by adjusting its rotational speed, which in turn regulates the speed and power. Used in low-pressure gas fuel systems. RMS – Root-Mean-Square. RPM - Revolutions per minute. RR – Resource Recovery. RS-232 – An Electronics Industries Association (EIA) recommended standard for transmitting serial data by wire. The standard is now officially known as EIA-232D. RS-485 – An Electronics Industries Association (EIA) serial interface standard for balanced, multipoint interface that incorporates tri-state drivers providing high tolerance to noise. RTD – Resistive Thermal Device. There are metallic RTDs (platinum, copper, nickel, etc.) and nonmetallic RTDs called thermistor. SA – Stand Alone. SCF - Standard cubic feet = cubic feet at one atmosphere, 68°F. SCFM – Standard cubic feet per minute flow. 400002-001 Rev D (September 2004) Page 19 of 22 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | MicroTurbine systems Glossary of Terms and Acronyms
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