直埋供热管道散热损失简化计算方法

Simplified Calculation Method of Heat Loss for Heating Pipe by Buried

为了准确预测城市热水集中供热管网动态热力工况,必须准确计算供热管道散热损失。现有的计算公式均比较复杂,不便于供热管网动态热力工况的计算分析。因此,本文在对目前国内外通用的直埋热水供热管道散热损失计算公式比较、分析的基础上,提出采用最小二乘法进行多项式拟合,建立仅以热水温度为变量的供热管道散热损失线性方程,并对不同管径、不同保温材料进行了计算分析。结果发现,各计算公式的偏差主要由热阻的计算范围不同所导致。简化后的拟合公式与选用公式的相对误差均在3%以内,可以满足工程应用的要求。

To get an accurate prediction of dynamic thermal city hot water central heating conditions. We must accurately calculate the heating pipeline heat loss. However, the calculation formulas available are complicated and inconvenienced of analysis the dynamic thermal conditions of heating pipeline. Therefore, this paper presents one order polynomial with least-squares solution, and then establishes linear equations of heating pipeline heat loss that the hot water temperature as a variable alone. It based on the compared and analyzed of buried hot water heating pipeline heat loss formula, This method simplified the calculation, but also the model of calculation analysis for different diameter, different insulation materials. It found that the deviation of the formula is caused mainly by the thermal resistance. The relative errors of simplified formula and the selection formulas are less than 3%, the result can meet the requirements for engineering applications.