Assembly and process for creating an extruded pipe for use in a geothermal heat recovery operation
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Solution Overview
Problem
Existing geothermal pipe assembly and processes lack efficiency in creating a durable, adaptable, and cost-effective solution for sequential two-stage extrusion of geothermal pipes from plasticized materials like HDPE, which is essential for effective geothermal heat recovery systems.
Innovation Solution
A sequential two-stage extrusion process involving the initial extrusion of a central sleeve followed by the attachment of outer lobes, with controlled cooling and temperature management, to form a durable and efficient geothermal pipe assembly that can be sectioned and assembled on-site for optimal geothermal fluid flow and energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-stage extrusion process is used for geothermal pipe, then the manufacturing process is simpler, but the pipe lacks the dual-functionality of fluid flow and structural stability
Solution Approach 1:
The pipe is divided into functionally distinct segments: a central flow channel for fluid circulation and an outer structural layer for mechanical strength and ground coupling. This segmentation allows each part to be optimized for its specific function while being manufactured through a coordinated multi-stage extrusion process.
Solution Approach 2:
The central flow channel is nested within the outer structural layer, creating a concentric dual-layer pipe structure. This nesting arrangement enables both fluid flow and structural support functions to coexist within a single integrated pipe component, achieved through sequential extrusion where the inner channel is formed first, followed by the outer layer.
2Ease of operation
If geothermal pipes are manufactured with on-site assembly capability, then installation flexibility is improved, but manufacturing and handling complexity increases
Solution Approach 1:
The pipe is manufactured in modular sections with standardized connection interfaces. Each section can be independently handled and transported, then assembled on-site using simple coupling mechanisms. This segmentation balances manufacturing complexity with installation ease, allowing flexible on-site assembly without requiring overly complex manufacturing processes.
3Reliability
If sequential two-stage extrusion is used to create central sleeve and outer lobes, then pipe durability and fluid flow efficiency are improved, but manufacturing time and process complexity increase
Solution Approach 1:
The central flow channel (sleeve) is extruded first and allowed to partially cool and set before the outer structural layer (lobes) is extruded around it. This preliminary action ensures the inner channel maintains its precise circular geometry for optimal fluid flow, while the outer layer is formed around a stable core, improving both durability and flow efficiency without requiring excessive manufacturing time.
Solution Approach 2:
The sequential extrusion process is designed to minimize idle time between stages. The first extrusion die continues producing the central sleeve continuously, while the second die is positioned to immediately follow and extrude the outer layer around the still-warm sleeve, which facilitates better bonding. This continuous operation reduces manufacturing cycle time while maintaining product quality.
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 enables the creation of a robust, adaptable HDPE geothermal pipe assembly that effectively utilizes geothermal gradients for temperature alteration, enhancing the efficiency and cost-effectiveness of geothermal heat recovery systems by ensuring consistent fluid flow and energy transfer.
Implementation Method 1
sequential two stage extrusion of a geothermal pipe from a plasticized material
Implementation Method 2
The central sleeve is shaped and cooled
Data Source
AI summary
An assembly and process for forming a two stage extruded pipe having a central inner sleeve and a pair of outer attached lobes. The central sleeve shaped (also termed a grout receiving tube) is produced in an initial extrusion operation, following which it enters a cross head operation where a pair of outer lobes are attached to cross sectional exterior surface locations according to a second stage extrusion operation so as to be integrally formed therewith. Other steps include cooling of the dual stage extruded pipe, as well as sectioning and stacking the pipe. Additional steps include forming elongated slots or apertures into the central sleeve portion of the finished extrusion, such in non-interfering fashion with the individual passageway defining and lobes.