Abstract
The effect of a regenerative heat exchanger in a gas turbine is analysed using a regenerative Brayton cycle model, where all fluid friction losses in the compressor and turbine are quantified by an isentropic efficiency term and all global irreversibilities in the heat exchanger are taken into account by means of an effective efficiency. This analysis, which generalizes that reported by Gordon and Huleihil for a simple, nonregenerative Brayton cycle, provides a theoretical tool for the selection of optimal operating conditions in a regenerative gas turbine. For a fixed ratio of the compressor inlet temperature to the turbine inlet temperature and in terms of the isentropic and regenerator efficiencies we present explicit results for the behaviour of the maximum efficiency, efficiency at maximum power, maximum power and power at maximum efficiency as well as for the behaviour of the pressure ratios required for maximum efficiency and maximum power.
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