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Energies 2019, 12(6), 1012; https://doi.org/10.3390/en12061012

Optimization of Geometric Parameters of Thermal Insulation of Pre-Insulated Double Pipes

Department of HVAC Engineering, Bialystok University of Technology, 15-351 Bialystok, Poland
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Received: 18 February 2019 / Revised: 10 March 2019 / Accepted: 11 March 2019 / Published: 15 March 2019
(This article belongs to the Section Energy and Environment)
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Abstract

This paper presents the analysis of the heat conduction of pre-insulated double ducts and the optimization of the shape of thermal insulation by applying an elliptical shape. The shape of the cross-section of the thermal insulation is significantly affected by the thermal efficiency of double pre-insulated networks. The thickness of the insulation from the external side of the supply and return pipes affects the heat losses of the double pre-insulated pipes, while the distance between the supply and return pipes influences the heat flux exchanged between these ducts. An assumed elliptical shape with a ratio of the major axis to the minor half axis of an ellipse equaling 1.93 was compared to thermal circular insulation with the same cross-sectional area. All calculations were made using the boundary element method (BEM) using a proprietary computer program written in Fortran as part of the VIPSKILLS project. View Full-Text
Keywords: thermal insulation; double heating ducts; twin pipes; energy savings; pollutants emission; district heating; network thermal insulation; double heating ducts; twin pipes; energy savings; pollutants emission; district heating; network
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Krawczyk, D.A.; Teleszewski, T.J. Optimization of Geometric Parameters of Thermal Insulation of Pre-Insulated Double Pipes. Energies 2019, 12, 1012.

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