Multi-Layer Pipe Insulation System Preventing Thermal Bridges
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Solution Overview
Problem
High-temperature pipes insulated with mineral wool experience a loss of compression strength due to binder burn-off, leading to reduced insulation effectiveness and potential thermal bridges.
Innovation Solution
A multi-layered insulation system is implemented, where a first inner insulation layer of mineral wool is supported by a separate support means, allowing an outer insulation layer to be directly abutted by adjacent elements without relying on the inner layer's compression strength, thereby preventing thermal bridges and maintaining insulation integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer insulation system is used around high-temperature pipes, then the structure is simple, but the binder burns off at high temperatures causing loss of compression strength and creating thermal bridges
Solution Approach 1:
The insulation system is divided into multiple layers: an inner insulation layer and an outer insulation layer separated by separating walls. This segmentation prevents the binder in one layer from directly affecting the other layer, maintaining compression strength even when one layer experiences binder burn-off at high temperatures.
Solution Approach 2:
Separating walls act as intermediary elements between the inner and outer insulation layers. These walls prevent direct thermal contact and oxygen transfer, stopping the exothermic reaction of binder burn-off from propagating between layers while maintaining thermal separation.
2Reliability
If separating walls extend from the pipe outer surface to the outer insulation surface, then air-excluding compartments are formed to prevent binder exothermic reaction, but thermal bridges are created reducing heat insulation properties
Solution Approach 1:
The separating walls are positioned to extend only through the radial thickness of the inner insulation layer, not through the entire insulation system. This dimensional limitation allows the outer insulation layer to bridge across the separating walls, maintaining thermal continuity in the outer layer while still providing compartmentalization in the inner layer to prevent binder reaction.
Solution Approach 2:
The separating walls provide air-excluding compartmentalization specifically where needed (in the inner insulation layer where binder is present) while allowing thermal continuity in the outer insulation layer. This localized application of separation prevents unnecessary thermal bridges.
3Device complexity
If the outer insulation layer is supported by the inner insulation layer, then the structure is simpler, but the inner layer loses compression strength at high temperatures causing the outer layer to sag or deform
Solution Approach 1:
The support function is extracted from the inner insulation layer and assigned to a separate outer insulation layer. The inner layer focuses on providing thermal insulation and preventing binder reaction, while the outer layer provides structural support. This separation of functions allows each layer to optimize its specific role without being compromised by the other's limitations.
4Reliability
If multiple insulation layers are used to prevent binder burn-off, then insulation reliability is improved, but the number of components and installation complexity increases
Solution Approach 1:
The outer insulation layer serves multiple functions: it provides additional thermal insulation, acts as a protective cover for the inner insulation layer, provides structural support, and prevents binder burn-off in the inner layer by creating an oxygen barrier. This multi-functionality reduces the need for separate protective components.
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 configuration enhances heat insulation properties and prevents thermal bridges, ensuring consistent insulation performance even as the inner insulation layer loses compression strength at high temperatures.
Implementation Method 1
support means (5) arranged on the pipe (2) and adjacent to the first insulation element (3)
Implementation Method 2
insulation system comprising a first insulation element (3) to form an inner insulation layer around the pipe (2)
Data Source
Figure 1~2
Figure 3
AI summary
The invention is related to an insulated pipe assembly as well as a method for insulating a pipe. To improve the heat insulating properties of the pipe, it is suggested that the insulated pipe assembly comprises: - a first insulation element (3) arranged on the pipe (2) to form an inner insulation layer around the pipe (2), wherein the first insulation element (3) comprises mineral wool; - support means (5) arranged on the pipe (2) and adjacent to the first insulation element (3); - a second insulation element (4) forming an outer insulation layer around the inner insulation layer and arranged on and supported by the support means (5) arranged on the pipe (2) and - adjacent second insulation elements (4) directly abut on each other in axial direction (13) of the pipe with their end faces (12).