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Article · Thermal Engineering · October 1, 2021

Analysis of the Insulation State of Underground Pipelines in the Heating Network

D.Zh. Karabekova, Perizat Kissabekova, Bekbolat R. Nussupbekov, A.К. Khassenov

Dana Karabekova
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Abstract

Abstract Numerous studies show that all the requirements for technical diagnostics of the state of heating networks and technological objects are currently satisfied by nondestructive testing methods, which are based on observation and automated registration of processes' temperature. Heat flow meters have a number of advantages compared with other devices that are based on nondestructive testing methods. They are distinguished by high sensitivity to changes in the thermophysical characteristics of controlled objects, the ability to conduct control without using an external energy source, efficiency, compactness, and ease of use. Several modifications of heat flux meters (HFM) based on a thermoelectric battery cell of a special design have been developed. A distinctive feature of HFM design is the presence of a thermoelectric battery converter equipped with a temperature-dependent and heating element whose active junctions are aligned with the receiving plate and whose passive junctions are in thermal contact with the heating element. An experimental model of an underground heat-insulating structure has been assembled to study the influence of the temperatures of the coolant and the environment, the depth of the pipelines, their technical parameters and the parameters of the surrounding soil on the nature of the distribution of the density of thermal radiation from the soil surface over heating networks. Experimental work on the calibration of thermocouples used to determine the temperature change in the soil and the calculation of the calibration coefficient of thermocouples and heat flow meter was carried out. The results of the study of the distribution and temperature change soil are presented. The developed device is designed to analyze the state of thermal insulation of heating networks' underground pipelines.

Engineering Diagnostics and ReliabilityHeat Transfer and Numerical MethodsThermography and Photoacoustic Techniquesburied pipelinesdistrict heating networksheat flow meter

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