不同截面地暖管传热性能和节能分析

Heat Transfer Performance and Energy Saving Analysis of Different Section Floor Heating Pipe

针对面积相同的三角形、梯形、长方形、正方形和圆形截面地暖管低温热水辐射采暖利用Fluent模拟了表面温度分布、地面平均温度等,并计算了表面温度不均匀度以及摩擦阻力、进出口压差和热效率。结果表明,流量在110cm3/s下,三角形(倒置)截面管道的地表平均温度比传统圆形提高了1.1℃;梯形(倒置)的表面温度不均匀度传统圆形截面管道优化了12.27%;在热效率方面,由高到低依次为三角形(倒置)>三角形(正置)>梯形(倒置)>矩形(宽高比为0.785)>矩形(宽高比为1)>矩形(宽高比为1.27)>圆形>梯形(正置),其中三角形(倒置)截面管道的热效率比传统圆形提高了17.9%。

Fluent was used to simulate the surface temperature distribution and average ground temperature for low-temperature hot water radiant heating of triangular,trapezidal,rectangular,square and circular floor heating pipes with the same area,and the non-uniformity of surface temperature,friction resistance,inlet and outlet pressure difference and thermal efficiency were calculated.The results show that the average surface temperature of the triangular(inverted)cross section pipeline is 1.1℃higher than that of the traditional circle at a flow rate of 110cm3/s.The trapezoidal(inverted)surface temperature non-uniformity of traditional circular section pipe is optimized by 12.27%;In terms of thermal efficiency,the order from high to low is triangle(inverted)>triangle(upright)>Trapezoid(inverted)>rectangle(aspect ratio 0.785)>rectangle(aspect ratio 1)>rectangle(aspect ratio 1.27)>Circle>trapezoid(upright),in which the thermal efficiency of the triangular(inverted)section pipe is 17.9%higher than that of the traditional circle.