蓄冷水箱传热研究

Research on heat transfer of cool storage tank

在空冷尖峰冷却系统中增加蓄冷装置,利用自然天气条件,将低温水在夜间储存,高温时段使用,可以降低机组背压。分析了冷却水在保温水箱中的温度变化过程,计算了保温水箱内冷水的自然对流换热量、导热量与1天内水的温度变化,比较了圆形水箱与方形水箱的保温效果,最后计算了使用蓄冷水后机组的背压降。结果表明蓄冷水箱具有较好的保温效果,且圆形水箱效果更好,按一定比例使用蓄冷水后背压降可达到5.4kPa,有很好的节能潜力。

Abstract：Adding a cool storage in peak air-cooling system, which uses natural weather condition to store the cool water in night and use the water in hot daytime can help decrease the back pressure of power units. Analyzed the temperature＇s changing process of the cooling water stored in thermal installation tank. And the heat transfer rate of cooling water＇s natural convection, the quantity of conductive heat and temperatures of the cooling water in every hour through a day were calculated. Besides, the paper compared the effects of the round-section tank and the square-section tank. At last, the reduction of back pressure of the unitth chilled water used in cooling system. The result demonstrated chilled water thermal storage tank has good thermal installation effect and the circular-section tankis better than the square-section tank. It was showed that chilled water thermal storage tank has good energy saving potential for the back pressure declining by 5.4kPa after using the chilled water.