Co-Extruded Geothermal Pipe Assembly for Directional Fluid Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing geothermal heat recovery systems face challenges in efficiently creating pipes that can effectively harness and transfer geothermal energy for heating and cooling applications, particularly in maintaining consistent fluid flow and thermodynamic efficiency.
Innovation Solution
A sequential two-stage extrusion process is employed to create a high-density polyethylene (HDPE) pipe with a central sleeve and arcuate outer lobes, allowing for integrally formed sections that can be assembled on-site, utilizing hot plate welding, and featuring grout receiving channels for enhanced stability and temperature alteration capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single-stage extrusion process is used to create geothermal pipes, then the manufacturing process is simpler and faster, but the pipe cannot provide both structural integrity and directional fluid flow control
Solution Approach 1:
The pipe is segmented into multiple functional zones: a central sleeve for structural integrity and grout injection, arcuate lobes for directional fluid flow control, and flattened regions for ground contact. This segmentation allows each zone to perform its specific function while being manufactured in a single extrusion process
Solution Approach 2:
The pipe employs composite HDPE material structure with varying densities and properties in different regions. The central sleeve and lobes are formed from the same extruded material but with different geometric configurations that provide distinct functional properties, combining structural strength with fluid flow management capabilities
2Strength
If the pipe is manufactured as a single integral piece, then structural strength is maximized, but on-site assembly and installation become difficult
Solution Approach 1:
The pipe is divided into modular sections that can be manufactured separately and assembled on-site using hot plate welding. Each section maintains the complex multi-zone structure (central sleeve, lobes, flattened regions) but can be joined to other sections through standardized welding interfaces, combining the benefits of integral manufacturing with modular installation
Solution Approach 2:
The pipe sections are pre-manufactured with integrated features including grout injection channels, welding interfaces, and precise geometric configurations. This preliminary fabrication of complex features allows for simpler on-site assembly through standardized joining methods rather than requiring complex field operations
3Ease of manufacture
If the pipe has a simple cylindrical shape, then manufacturing is easier, but temperature alteration and geothermal energy transfer efficiency are reduced
Solution Approach 1:
Different regions of the pipe are given different geometric qualities to optimize local functions: the central sleeve provides structural strength, the arcuate lobes create directional fluid flow paths for heat exchange, and the flattened regions maximize ground contact area. This local differentiation of geometric properties enhances thermal efficiency without requiring complete redesign of the entire pipe structure
Solution Approach 2:
The pipe transitions from a simple two-dimensional cylindrical cross-section to a three-dimensional complex geometry with arcuate lobes and flattened regions. This dimensional complexity creates internal flow channels and external contact surfaces that enhance heat transfer efficiency while maintaining manufacturability through extrusion processes
4Adaptability or versatility
If cross apertures are formed after extrusion, then fluid flow paths are created, but structural weakness and leakage risks increase
Solution Approach 1:
The cross apertures and internal flow channels are formed as integral features during the extrusion process itself, rather than being added afterward. The die geometry is designed to create the desired aperture patterns and flow paths as the pipe is being formed, ensuring that these features are structurally integrated and free of weak points or leakage risks associated with post-manufacturing modifications
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
The process results in a pipe that efficiently communicates fluid flow and modifies temperature, optimizing geothermal energy transfer for applications such as electricity generation by maintaining directional fluid flow and thermodynamic efficiency, while allowing for easy assembly and installation.
Implementation Method 1
high-density polyethylene (HDPE) pipe with a central sleeve and arcuate outer lobes... provide for temperature alteration of the inner communicated fluid flow
Implementation Method 2
utilizing hot plate welding technique
Implementation Method 3
cold-water immersion hardening
Data Source
AI summary
The present invention discloses an assembly and process for creating a co-extruded pipe which includes the steps of extruding a first elongated component exhibiting an open interior. Additional process steps include co-extruding at least one, and typically a pair, of additional elongated components each having an arcuate or lobe cross sectional shape or profile. The additional components are bonded to exterior locations of the first component to establish a pair of additional open interiors between the components and prior to cooling and hardening.