一种温度波动条件下供热管道热损失测试计算方法
Heat loss testing and calculation method of heating pipes with temperature fluctuations
摘要：
供热管道保温是减少运输过程中热量散失的主要措施，为了掌握管道的保温状况，需要对其进行保温测试评价。针对热源非稳态特性对直埋供热管道保温测试评价的影响进行研究，给出了热源温度波动情况下直埋供热管网散热损失的测试计算方法。以大庆市某一级供热管网3个管段的实测数据为例，分别计算考虑和忽略热源温度波动影响的管道保温层外表面散热热流密度q′与q，以及二者的相对误差。结果表明，各管段q′与q的最大相对误差分别为555.9%，419.6%和88.4%。由此可见，测试评价供热管道保温状况时，热源温度波动影响很大。
Abstract：
Thermal insulation of heating pipes is the main measure to cut down the heat loss during transferring. A thermal insulation test on district heating pipes is necessary in order to evaluate the insulation situation. Studies the effect of heat source temperature fluctuations on thermal insulation test of directburied heating pipes and develops a method to test and calculate the heat loss of heating pipes with heat source temperature fluctuations. Using test data of three pipe sections of a primary pipeline in Daqing City, calculates the heat flux outside the pipe insulation with or without considering the heat source unsteady characteristics, as well as their relative errors. The maximum relative errors of three pipe sections are 555.9%，419.6% and 88.4%, respectively. The results show that heat source temperature fluctuations have a great effect on the thermal insulation test of directburied pipes.
Keywords:districtheatingnetwork,unsteadyheatsource,thermalinsulationtest,temperature,timedelay