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Parametric study of an irreversible regenerative Brayton cycle with isothermal heat addition

机译：添加等温热的不可逆布雷顿循环的参数研究

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摘要

A parametric study of an irreversible regenerative Brayton heat engine with isothermal heat addition has been performed with external as well as internal irreversibilities. The external irreversibility is due to the finite temperature differences between the heat engine and the external reservoirs, while the internal ir-reversiblities are due to other processes, viz. nonisentropic compression and expansion processes in the compressor and turbine, respectively, and the regenerative heat loss. The power output is maximized with respect to the working fluid temperatures, and the effects of different parameters on the maximum power output and the corresponding thermal efficiency have been studied. There is a significant improvement in the thermal efficiency (above 15%) of a Brayton cycle with isothermal heat addition over the conventional one. It is seen that the effect of the isobaric side effectiveness is rather pronounced for the power output and the corresponding thermal efficiency. The effect of the turbine efficiency is found to be more than that of the compressor on both power output and thermal efficiency. Also, it is seen that there are optimal values of the various heat capacitance rates between the different reservoirs and the heat engine.
机译：对具有等温热添加的不可逆蓄热式布雷顿热机进行了参数研究，并具有内部和外部不可逆性。外部不可逆性是由于热机与外部容器之间的温度差有限，而内部不可逆性则是由其他过程引起的，即。分别在压缩机和涡轮中进行非等熵压缩和膨胀过程，以及再生热损失。相对于工作流体温度，功率输出最大，并且研究了不同参数对最大功率输出和相应热效率的影响。与常规方法相比，通过添加等温热量，布雷顿循环的热效率有了显着提高（超过15％）。可以看出，对于功率输出和相应的热效率，等压侧效率的影响相当明显。发现涡轮机效率对功率输出和热效率的影响都大于压缩机。同样，可以看出，在不同的容器和热机之间存在各种热容率的最佳值。

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