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For particular cases when the pre-compressor outlet temperature is above the main compressor outlet temperature there is an available heat to regenerate and the partial cooling cycle efficiency can be further improved. By introducing a third recuperator with three streams can be this heat regenerated as well. However three streams recuperator can be substituted by two common recuperators parallel connected. 1.10 Summary Five cycles were selected for analysis plus simple Brayton cycle. Two of them are simple arrangement (pre-compression. re-compression) and three are more complex (split expansion, partial cooling and improved regeneration). A method of preventing recuperator against pinch point problem is flow dividing at all cases except for the pre-compression cycle where additional compression is applied. 1.11 Expected Results An Italian scientist Angelino has made great research work in the area of CO2 thermal cycles (all of the analyzed cycles were proposed by him) and had drawn a comparison of some cycles from point of losses to the ideal Carnot cycle. He assumed turbine inlet temperature 700°C and select different compressor inlet pressures for each cycle (re- compression 75atm, partial cooling 20atm (i.e. with condensation), and partial cooling with improved regeneration 20atm) and a turbine inlet pressure was varied. On his figure we can roughly see what to expect from the analysis. The re-compression cycle has the lowest losses from the Carnot since the turbine inlet pressure is above 200atm the cycle thermal efficiency grows with increasing pressure. Partial cooling cycle has similar but not so steep trend otherwise the losses are higher. Partial cooling with improved regeneration cycle seems to be independent of turbine inlet pressure and its thermal efficiency is till 250atm the highest at higher pressures is overcame by the re-compression cycle. Figure 1.10 Angelino’ s comparisonPDF Image | 2009 TECHNOLOGY INNOVATION WINNERS
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