Soil-Matched Pipeline Bedding for Low-Loss Heating Networks
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Solution Overview
Problem
The high investment costs for constructing thermally insulated pipeline elements in heating networks are a significant obstacle in developing decentralized renewable heat supply systems, with complex production and installation processes contributing to these costs.
Innovation Solution
A method is disclosed that involves segmenting the pipeline portion into segments based on soil physical parameters, using a water-permeable segment bedding material to minimize heat loss, and embedding the pipeline in a trench with the bedding material, which can be locally sourced to reduce transportation costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If double-walled pipeline elements with thermal insulation are used, then heat loss is reduced, but production and installation costs increase
Solution Approach 1:
The patent extracts the thermal insulation function from the pipeline element itself and relocates it to the bedding material surrounding the pipeline. Instead of insulating the pipe, the insulating function is provided by the backfill material (e.g., foam glass granules, expanded polystyrene beads) placed around the pipe in the trench, thereby simplifying the pipeline element while maintaining thermal performance.
Solution Approach 2:
The patent introduces a specialized bedding material as an intermediary between the pipeline and the surrounding soil. This intermediary material serves multiple functions: thermal insulation, mechanical protection, and water drainage, replacing the need for complex double-walled insulated pipeline elements while achieving the same heat loss reduction.
2Reliability
If complex laying and welding work is performed to ensure fluid-tight connections, then leakage is prevented, but installation time and costs increase
Solution Approach 1:
The patent replaces complex welding and laying operations with a simpler connection method. Instead of requiring precise welding to achieve fluid-tight joints, the system uses push-fit or snap-together connections that replicate the reliability of welded joints through mechanical interlocking and sealing elements, dramatically reducing installation time and complexity.
3Loss of energy
If thermally insulated pipeline elements are produced and delivered to the trench, then heat loss is minimized, but production costs and transportation expenses increase
Solution Approach 1:
The patent segments the thermal insulation function from the pipeline element and implements it separately through the bedding material. This allows the pipeline to be produced as simple, inexpensive single-walled elements that can be manufactured locally and transported easily, while the thermal insulation is provided in situ by the bedding material placed during installation.
Solution Approach 2:
The patent employs inexpensive bedding materials such as foam glass granules, expanded polystyrene beads, or other lightweight insulating aggregates that can be produced locally and placed around the pipeline during installation. These materials provide effective thermal insulation at fraction of the cost of factory-produced insulated pipeline elements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces production and installation costs while maintaining thermal insulation efficiency, allowing for the construction of cost-effective heating networks with minimal heat loss, comparable to conventionally constructed systems.
Implementation Method 1
using a water-permeable segment bedding material to minimize heat loss
Data Source
AI summary
In a method for setting up a pipeline section of a pipe system in a heat network, which is provided for transferring a heat transfer fluid between a heat provider and a heat consumer, the pipeline section is subdivided into segments in a segmentation step. A segment characteristic variable is determined for each segment based on a physical soil characteristic variable. The determined segment characteristic variables of two adjacent segments differ by more than a predefined segment characteristic variable difference value. In a bedding determination step, segment embedding of a pipeline segment, introduced in the trench in this segment, in a water-permeable segment bedding material is predefined for each segment such that a heat loss of the heat transfer fluid transferred in the pipeline segment, which is averaged over the segment and is based on a unit of length, is lower than a predefined heat loss limit value.