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New model for onsite heat loss state estimation of general district heating network with hourly measurements

机译：每小时测量一般区域供热网络现场热损失状态的新模型

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摘要

With the development of advanced automation and information technologies, more intelligent meters and measurements are involved in the management of modern district heating systems. A huge amount of measured data can be exploited to technical improvements and environmental protections besides billing purpose. In this paper, a new model is proposed to estimate onsite heat losses of a general pipe network with hourly measurements of heat sources and substations. A detailed heat loss profile along each pipe can be obtained by the proposed model, which can significantly improve the accuracy of the location of damaged insulation. Furthermore, the thermal deterioration of buried pipes can also be evaluated conveniently. In the case study, a real district heating system which has 3 heat sources and 34 substations is analyzed to validate the proposed model. The onsite heat losses of all pipes for 24 h are calculated by the hourly measured data. The results indicate that the heat loss profile of a return pipe is lower and more fluctuating than that of corresponding supply one. The heat losses of selected pipes are nearly 3.51-8.32% more than the reference values, which indicate that selected pipes' insulations are of a little aging or corroded by surrounding soil.
机译：随着先进的自动化和信息技术的发展，现代区域供热系统的管理涉及更多的智能电表和测量。除计费目的外，大量测量数据还可用于技术改进和环境保护。在本文中，提出了一种新的模型，通过每小时对热源和变电站的测量来估算一般管网的现场热损失。通过提出的模型可以获得沿每条管道的详细热损失曲线，这可以显着提高受损绝缘的位置精度。此外，还可以方便地评估埋管的热劣化。在案例研究中，分析了一个具有3个热源和34个变电站的真实区域供热系统，以验证所提出的模型。通过每小时测量的数据计算所有管道在24小时内的现场热损失。结果表明，与相应的供热管相比，回流管的热损失曲线更低且波动更大。所选管道的热损失比参考值高出近3.51-8.32％，这表明所选管道的保温层有些老化或被周围的土壤腐蚀。

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