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Figure 5: The evolution and complexity of component cooling.17 Comparing material improvements and cooling advancements Material improvements and cooling advancements have been complementary in gas turbine R&D, however each type of development is different. The first points of comparison are the costs involved with each type of advancement. For example, an advantage of material improvements is that they allow for increased turbine performance without necessitating additional machining costs. Unlike intricate cooling schemes, which require expensive machining during the manufacturing of blades with complex fluid pathways, material improvements may simply mean a change in liquid metal alloy that is poured into preexisting molds. In contrast, cooling can boast of the fact that it requires no changes to potentially more expensive materials. Another major difference between types of development is the nature of their progress. Although both initial material and cooling techniques stemmed from the military aerospace industry, power system engineers soon began adapting each type of technology independently. Material improvements occurred incrementally, only making substantive leaps when parts could advance to the point where they could be manufactured less expensively. In contrast, cooling advancements 17 Bannister et. al. “Evolution of Westinghouse Heavy Duty Power Generation and Industrial Combustion Turbines,” Transactions of the ASME, April, 1996, p. 324. 12PDF Image | Energy RD Performance: Gas Turbine Case Study
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