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improvements to the both the first row blades and vanes. By this time, two levels of blades and three levels of vanes were cooled. Figure 7 shows similar data for another family of turbines, the larger 501 series by the same company. This figure shows how RITs increased with the use of cooling in the early 1970s, stalled during a period of slow development during the 1980s, then increased when development resumed using advanced computer codes in the 1990s. As in the case of the 251 series, each successive turbine included improved or expanded cooling. The AA model only cooled the first row stationary vanes. The B model cooled its first row blade and second row vane segment as well. The D model included improved early stage cooling as well as an expansion of cooling the second row blade. The D5 model cooled the first two rows of blades and three rows of vanes. Figure 8 shows how increased efficiencies and higher RITs are linked for another turbine manufacturer as well. This figure shows how series of GE family turbines improved in both RIT and efficiency. As before, each letter designates a family of similar machines. The letter designations are company-specific, however they generally reflect groups of turbines which have similar RIT and size (output) characteristics. Together, these figures clearly show how technological improvements have increased firing temperatures and efficiencies. 1200 1100 1000 900 800 1965 1970 1975 1980 1985 1990 1995 2000 251 B12 251 B8 251 B10 251 B 251 B2 251 AA 251 A Year 14 Temperature (C)PDF Image | Energy RD Performance: Gas Turbine Case Study
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