Numerical Investigation of the Thermal Regime of Underground Channel Heat Pipelines Under Flooding Conditions with the Use of a Conductive-Convective Heat Transfer Model
This paper presents the results of numerical analysis of thermal regimes and heat losses of underground channel heating systems under flooding conditions with the use of a convective-conductive heat transfer model with the example of the configuration of the heat pipeline widely used in the Russian Federation — a nonpassage ferroconcrete channel (crawlway) and pipelines insulated with mineral wool and a protective covering layer. It has been shown that convective motion of water in the channel cavity of the heat pipeline under flooding conditions has no marked effect on the intensification of heat losses. It has been established that for the case under consideration, heat losses of the heat pipeline under flooding conditions increase from 0.75 to 52.39% due to the sharp increase in the effective thermal characteristics of the covering layer and the heat insulator caused by their moistening.
Keywordsheating system heat losses heat line insulator humidification flooding
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- 1.SP 61.13330.2012. Thermal Insulation of Equipment and Pipelines [in Russian], Minregion Rossii, Moscow (2012).Google Scholar
- 2.B. M. Shoikhet, Design of thermal insulation of the pipelines of heating systems, Énergosberezhenie, No. 1, 50–57 (2015).Google Scholar
- 3.R. A. Il′in, Estimation of heat losses in heating systems in using liquid–crystal heat insulators, Teploénergetika, No. 7, 76–80 (2015).Google Scholar
- 4.V. V. Bukhmirov and A. K. Gas′kov, Application of thin-film coatings for energy saving, Vestn. Ivanovsk. Gos. Énerg. Univ., No. 5, 26–31 (2015).Google Scholar
- 5.V. V. Tokarev and Z. I. Shalaginova, Computing method for multilevel adjustment of the thermohydraulic regime of large heat supply systems with intermediate control stages, Teploénergetika, No. 1, 71–80 (2016).Google Scholar
- 6.G. V. Kuznetsov and V. Yu. Polovnikov, Numerical investigation of the thermal regimes of double-pipe channel pipelines with the use of a conductive-convective heat transfer, model, Teploénergetika, No. 4, 48–52 (2012).Google Scholar
- 8.A. A. Nikolaev (Ed.), Designer′s Handbook, Design of Heating Systems [in Russian], Integral, Kurgan (2010).Google Scholar
- 9.A. A. Samarskii and A. N. Gulin, Numerical Methods of Mathematical Physics [in Russian], Nauchnyi Mir, Moscow (2000).Google Scholar
- 11.V. V. Shaidurov, Multigrid Finite Element Methods [in Russian], Nauka, Moscow (1989).Google Scholar
- 12.V. V. Ivanov and L. B. Vershinin, Temperatures and heat flux distribution in the zone of underground heat supply systems, in: Proc. 2nd Russian National Heat Transfer Conf., Heat Conduction, Thermal Insulation, Vol. 7, Izd. MÈI, Moscow (1998), pp. 103–105.Google Scholar