蒸发冷却电机冷却系统的热力循环分析

为了便于从理论上了解蒸发冷却循环,推动蒸发冷却技术的发展,本文分析了立式和卧式蒸发冷却电机定子内冷系统的热力循环,并在描述动力循环过程的压力-焓图(lgp-h图)和温度-熵图(T-S图)上表示了出来.分析结果认为,立式和卧式定子冷却系统的热力循环过程相似:冷却介质在定子空心导线中的流动过程是吸热降压过程,在冷凝器中为等压放热过程,冷凝后的过冷液体到定子空心导线入口的过程为等熵压缩过程,所以立式和卧式定子内冷系统的热力循环过程可以用相同的压焓图和温熵图表示.最后用已有的实验数据校验后认为热力循环图是符合实际情况的,可以为冷却系统优化设计提供参考.

Thermodynamic cycle of the cooling system in evaporative generators

In order to promote the understanding of the evaporative cooling technology,this paper particularly analyzed the thermodynamic cycle of the stator inner-cooling system in vertical and horizontal evaporative generators,and showed it on the pressure-enthalpy figure(lg p-h figure) and the temperature-entropy figure(T-S figure).The analysis indicates that the thermodynamic cycle of the vertical stator inner-cooling system is similar to that of the horizontal system: the refrigerant absorbs heat and its pressure drops in the stator hollow conductor;it is cooled with certain pressure in the condenser;and it is compressed with certain entropy from the condenser exit to the stator conductor’s entry,so the thermodynamic cycle of the vertical and the horizontal stator inner-cooling system can be showed on the same lgp-h figure and T-S figure.Comparison with experimental data proves that the thermodynamic cycle figure is feasible,and can provide a design reference to the stator inner-cooling system of the evaporative generator.