双热源螺旋管水箱换热器换热性能研究
Heat transfer performance of water tanks with dual heat source helical coil heat exchangers
摘要:
建立了水箱换热的数学模型,通过实验验证了模型的准确性。以优化后的水箱模型为基础,模拟研究了上螺旋管距水箱顶面的距离、下螺旋管距水箱底面的距离、螺旋管弯曲直径与水箱直径之比、螺旋管螺距、水箱高度与直径之比、入口流速等参数对水箱换热效果的影响,并利用回归分析得到了螺旋管外侧努塞尔数Nu与各因素之间的拟合关系式。结果表明,螺旋管弯曲直径与水箱直径之比、螺旋管螺距、入口流速对螺旋管外侧Nu的影响较大。
Abstract:
Establishes a mathematical model of heat transfer in water tanks, and verifies the accuracy of the model by experiments. Based on an optimized water tank model, simulates the influences of the parameters such as the distance between the upper spiral tube and the top surface of water tank, the distance between the lower spiral tube and the bottom of water tank, the ratio of the bending diameter of spiral tube to the diameter of water tank, the pitch of spiral tube, the ratio of the height to diameter of water tank and the inlet velocity on the heat transfer effect of the water tank. Obtains the fitting relationship between the Nu of the outside of spiral tube and the various factors by regression analysis. The results show that the ratio of the bending diameter of spiral tube to the diameter of water tank, the pitch of spiral tube and the inlet velocity greatly influence the Nu of the outside of spiral tube.
Keywords:dual heat source, water tank, helical coil heat exchanger, heat transfer performance, structural parameter, Nu, numerical simulation