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UNDERSTANDING GAS TURBINE PERFORMANCE© 1.0 WHAT ARE ISO, NEMA and GTW RATINGS ? 1.1 ISO Ratings The International Organization for Standardization (ISO) is a worldwide federation of national standards bodies which prepares and issues standards which are accepted around the world. ISO 2314 Gas Turbines - Acceptance Tests is the international standard defining the basis and procedures for rating and testing Gas Turbines. The ISO standard contains definitions of the parameters to be measured and defines the appropriate procedures. Vendors of gas turbines publish ISO ratings in order to provide comparative performance at a standardized baseline point. The Standard Reference conditions contained in ISO 2314 for all Gas Turbine testing and rating are defined as: A. For the Intake Air at the compressor flange (alternatively the compressor intake flare): a) A total pressure of 101.3 kPaa (14.69 psia) b) A total temperature of 15 °C (59 °F) c) A relative humidity of 60% B. For the Exhaust Gases at the turbine exhaust flange: a) A static pressure of 101.3 kPaa (14.69 psia) The above A & B criteria essentially equate to a gas turbine theoretically installed at sea level – with no inlet air filtration, silencing or ducting; and with no exhaust plenum, heat recovery device, exhaust silencer or discharge stack. In actual practice, there are probably no stationary gas turbines which are installed in this manner, and that operate under these exact conditions. According to ISO, the Power Output of the gas turbine may be expressed in terms of output at the turbine coupling or electrical power at the generator terminals. In addition, ISO states that the gas turbine's Thermal Efficiency or the Specific Heat Consumption shall be based on the net specific energy of the fuel at constant pressure. The specific energy used shall be based on a pressure of 101.3 kPaa and a temperature of 15 °C (59 °F). The Sensible Heat above 15°C (59 °F) shall be taken into account. UNDERSTANDING GAS TURBINE PERFORMANCE © Gryphon International Engineering Services Inc. St. Catharines, Ontario, Canada GTPerf_0900 Page 1PDF Image | UNDERSTANDING GAS TURBINE PERFORMANCE
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