Method of Reducing Energy Consumption for Heating Frost-Susceptible Soil around Chilled Underground Pipeline
Publication: Journal of Cold Regions Engineering
Volume 34, Issue 3
Abstract
This article is devoted to the calculation and optimization of the engineering protection of cold underground condensate pipelines using heat-tracing cable in frost-susceptible soils in Western Siberia. The method for stress–strain state calculation of a pipeline in frost-susceptible soils has been developed. The dependence of maximal stresses in the pipeline wall on the linear heat-generation rate of the heat-tracing cable in the case of a constant heating mode has been derived. The dependence shows a monotonic decrease of maximum displacement of the pipeline and stresses in the pipeline wall with an increase of the linear heat-generation rate. The influence of a startup delay of the heat-tracing cable to the stress–strain state of the pipeline has been numerically investigated. The use of heating mode with delayed startup reduces the electrical energy consumption by 35.4% for considered pipeline comparing a constant heating mode due to fast soil freezing around a pipeline at the initial stage. The effect of energy saving depends on the linear heat-generation rate of the heat-tracing cable. For the considered pipeline, heat-tracing cable with a minimum permissible linear heat-generation rate of 1 W · m−1 and 3.5 years startup delay provides maximum energy savings.
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© 2020 American Society of Civil Engineers.
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Received: Apr 4, 2019
Accepted: Dec 23, 2019
Published online: May 21, 2020
Published in print: Sep 1, 2020
Discussion open until: Oct 21, 2020
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