运用热力学火用分析的方法,分别考虑了高低温侧换热器、热回收装置侧换热器和中冷器的热阻损失,以及压缩机和涡轮机中的内不可逆损失,以无因次总输出火用和火用效率为目标函数,借助数值分析的方法,研究了恒温热源条件下不可逆中冷焦耳—布雷顿功热并供系统的火用性能,分析了主要特征参数对无因次总输出火用及火用效率的影响。分析结果表明,当中间压比不变而总压比变化时,存在一组最佳运行参数,使无因次总输出火用达到最大,还存在最大的总输出火用和火用效率以及相对应的一组最佳运行参数。提高中冷器换热有效度可以增加无因次总输出火用和火用效率。
By employing an exergy analytic method of thermodynamics,taken into account respectively were the following factors: thermal resistance losses in high and low temperature side heat exchangers,heat recovery device side heat exchangers and intercoolers,and inner irreversible losses in the compressors and turbines.With the non-dimensional total output exergy and its efficiency serve as the target function and with the aid of a numerical analytic method,studied was the exergy performance of an irreversible intercooled Joule-Brayton power-and-heating cogeneration system with a constant temperature heat source.In addition,the influence of the main characteristic parameters on the non-dimensional total output exergy and its efficiency was also analyzed.The analytic results show that when the intermediate pressure ratio keeps constant but the overall pressure ratio changes,there exist a group of optimum operating parameters making the non-dimensional overall output exergy attain its maximum and also a maximal overall output exergy and efficiency as well as a group of corresponding optimum operating parameters.In such a case,to improve the heat exchange efficiency of the intercoolers can enhance the non-dimensional overall output exergy and efficiency.