【摘要】 通过对卡诺循环以及由两个等温过程和两个多变过程组成循环的分析和研究 ,从理论上证明由两个等熵过程和两个多变过程组成的热力循环 (在相同的当量温限下 ) ,能够达到与卡诺值相等的热力学效率 ,并由此得到了一些低温制冷机理想回热循环的热力学效率 ,采用改进型布雷顿循环 (由两个等温和两个等压过程组成 )和GM循环对脉管制冷机循环进行了研究 ,给出了与卡诺循环有关的循环图谱及各种回热制冷循环的理想热力效率比较图更多还原

【Abstract】 Based on research and analysis of thermodynamic efficiency ε of the Carnot cycle and such cycle with two isothermal and two polytropic processes,another thermodynamic cycle with two isentropic and two polytropic processes,which can achieve the Carnot value of thermodynamic efficiency at the same equivalent temperature limits is testified theoretically Thermodynamic efficiency expressions of a number of ideal regenerative refrigeration cycles are derived It is shown that the Brayton cycle(two adiabatic and two isobaric processes)and GM cycle can be used for the prediction of thermodynamic efficiency of stirling and GM type pulse tube refrigeration respectively A Classified branch chart and a plot of ideal thermodynamic efficiency of regenerative refrigeration cycles are given for comparison更多还原