基于布雷顿循环的原理与特点，对典型循环结构的动力部件与换热部件布局的效率和功率性能进行了比较，分析了运行参数对循环效率的影响规律，同时进一步阐述了关键循环动力部件（叶轮机械包括压缩机与透平）与换热部件（热交换器）的综合技术性能及部件选择的差异性。研究表明:实验中循环操作参数取最低温度为32 ℃、最高温度为342 ℃、压比为1.65时，循环效率可达31.5%；最低循环温度下降和最高循环温度升高有利于改善循环效率，并且对于复杂循环一般存在最佳压比；根据循环输出功率大小,叶轮机械一般采用径流（<10 MW时）或轴流结构（≥10 MW时）；与常规换热器相比，印刷电路板式换热器具有更为紧凑的结构和高效的换热性能。

According to the principle and characteristics of Brayton cycle,the efficiency and power performance of the layout of power components and heat exchange componerots are compared,and the influence of operating parameters on cycle efficiency is analyzed.Also,the comprehensive technical performance and differences of key cyclic power components(impeller machinery including compressor and turbine) and heat exchange components(heat exchanger)are further explained.It was found that the cycle efficiency in the experiment can reach 31.5% when the minimum temperature is 32 ℃, the maximum temperature is 342 ℃, and the pressure ratio is 1.65.The decrease of the minimum cycle temperature and the increase of the maximum cycle temperature are conducive to improving cycle efficiency,and there is generally an optimal pressure ratio for complex cycles.According to the cycle output power, the impeller machinery generally adopts the radial flow(<10 MW) or axial flow structure(≥10 MW) and compared with the conventional heat exchanger, printed circuit board heat exchangers have a more compact structure and efficient heat exchange performance.

TK474.8+11