圆柱型空气式相变储能装置放热影响因素研究

Study on exothermic influence factors of cylindrical air phase

利用数值模拟的方法从3个方面研究了圆柱型空气式相变储能装置放热时的影响因素,结果表明:换热管管径为65mm和70mm的装置在放热的时候液相率的变化几乎相同,而换热管管径为60mm的装置放热时液相率降为零所用的时间比换热管管径为65mm和70mm的装置多了27.2%,延长了装置的放热时间,但单位时间所加热空气的量也相对较少;在放热时入口空气流速大的装置同一时间内空气带走的热量相对较多,放热速率快。但流速的增加也会减少空气和相变材料接触的时间,影响装置放热的效果;每根换热管都有自己相应的热影响半径,间距太大或太小都会影响到装置放热的效率。

Using the method of numerical simulation,the factors affecting the heat release of cylindrical air phase change energy storage device are studied from three aspects.The results show that the liquid phase ratio of the heat exchanger tube with diameter of 65mm and 70mm is almost the same when it is exothermic.When the heat exchanger tube diameter is 60mm,it takes 27.2%more time for the liquid phase rate to drop to zero than the heat exchanger tube diameter of 65mm and 70mm.Although the exothermic time of the device is prolonged,the amount of air heated per unit time is relatively small.The device with high inlet air velocity takes away relatively more heat and faster heat release rate at the same time.However,the increase of flow rate will also reduce the contact time between air and phase change material,which will affect the exothermic effect of the device.Each heat exchanger has its own radius of heat effect.Too large or too small spacing will affect the exothermic efficiency of the device.