Type: Article
Title: Alternative Backfill Materials for Sustainable District Heating Systems
Authors: Weidlich, Ingo 
Dollhopf, Stefan 
Hay, Stefan
Issue Date: 2024
Keywords: Alternative backfill material; heating pipe design; sustainable district heating; pipe friction; sustainable energy planning
Abstract: 
District heating pipes are usually installed in open trenches that are refilled with backfill material. Special requirements were set for this material in standards and codes of practice and in the most cases natural sands were used in the past. Today natural sands are a scarce resource and must be protected. Furthermore, regulations of the circular economy challenge existing construction methods. In sustainable energy systems natural sands should only be used in exceptional cases. Against this background the general planning process and the significant calculation methods for district heating pipes were analysed and other material options and the hindrances for the use of alternative backfill were identified. Necessary modifications in the planning and calculation process were elaborated. It was shown, that the transition to a more circular economy approach in district heating systems is realistic, if conventional planning methods will be adjusted.
Subject Class (DDC): 624: Ingenieurbau und Umwelttechnik
HCU-Faculty: Technisches Infrastrukturmanagement 
Journal or Series Name: Environmental and climate technologies 
Volume: 28
Issue: 1
Start page: 639
End page: 651
Publisher: RTU Press
ISSN: 2255-8837
Publisher DOI: 10.2478/rtuect-2024-0050
URN (Citation Link): urn:nbn:de:gbv:1373-repos-13859
Directlink: https://repos.hcu-hamburg.de/handle/hcu/1082
Language: English
Creative Commons License: https://creativecommons.org/licenses/by/4.0/
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