The schematic diagrams above show a simple and a regenerative gas turbine engine. A regenerator
How is the cycle efficiency for a regenerative gas turbine engine defined? As the amount of heat that is transferred in the regenator increases, the cycle efficiency The amount of heat that is transferred in the regenerator, qREGEN, is equal to hX - h2. An ideal regenerator transfers the maximum amount of heat possible, defined by the conditions TX = T4 and, for an ideal gas, hX = h4. The regenerator effectiveness is used to relate the actual heat transferred in a regenerator to the maximum heat transfer possible. Typical regenator effectivenesses range from 60 to 80%. Further increases in effectivenesses are typically not economical due to the large capital expenditures required to achieve these increases.
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