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Fig. 6. Wnet maximum improvement by reheat Fig. 7. η maximum improvement by reheat 3.2 Effects of turbine inlet temperature T3 on the cycle performance Fig. 8 and Fig. 9 illustrate effects of turbine inlet temperatures on the performance of the reheat cycle. Obviously, for the fixed Ph, higher turbine inlet temperature leads to larger Wnet and higher η. Compared to others’ studies for baseline cycles, dependence of reheat cycle performnace on turbine inlet temperature is similar. In order to quanlify the improvement by means of reheat, improvement factors for Wnet and η are defined as: εW = (Wnet )r − (Wnet )b (11) (Wnet )b εη =(η)r −(η)s (12) (η)s Where subcripts r and b denote reheat cycle and baseline cycle, respectively. Fig. 8. work output versus Ph at different T3 Fig. 9. Thermal efficiency versus Ph at different T3 Fig. 10. Wnet improvement factor versus Ph Fig. 11. η improvement factor versus Ph Results are shown in Fig. 10 and Fig. 11, respectively. It can be seen that higher improvements of both Wnet and η are obtained at a lower turbine inlet temperature and a higher Ph. Under present conditions, the maximum improvements of Wnet and η are approximately 90% and 30%, respectively. Additionally, the improvement of Wnet is more significantly than that of η. This may indicate some potential applications of reheat cycle. Firstly, resource of waste heat is relatively cheap and even free like waste streams, thus achieveing high thermal efficiency is less important than genrating the maximum specific net work output. Secondly, the maximum temperature of waste heat is relatively low, therefore limiting the turbine inlet temperature, since both improvement factors are higher at lower turbine inlet temperature. 36PDF Image | Parametric analysis of a reheat carbon dioxide transcritical power cycle using a low temperature heat source
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