Geothermal Probe Base Metallic Coating Diffusion Barrier
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Solution Overview
Problem
Conventional geothermal probes are not diffusion-tight, allowing gases like CO2 or methane to diffuse through the pipe walls and interfere with the fluid heat carrier, leading to operational malfunctions.
Innovation Solution
A geothermal probe base with a 180-degree pipe bend, coated with a metallic layer using PVD processes or made of metallic materials like aluminum, stainless steel, or alloys, combined with a multilayer composite film or metal foil on the pipes to prevent gas diffusion, while maintaining optimal heat transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic pipes (polyethylene or polypropylene) are used for geothermal probes, then ease of manufacture and cost-effectiveness are improved, but diffusion-tightness deteriorates allowing gases like CO2 or methane to penetrate
Solution Approach 1:
The patent applies a metallic coating layer (such as aluminum, zinc, or stainless steel) on the plastic pipe surface to create a composite structure. This composite material combines the manufacturing advantages of plastic with the diffusion-tight properties of metal, preventing gas penetration while maintaining ease of manufacture through coating processes.
Solution Approach 2:
The patent uses thin metallic coating films applied on the plastic pipe surface to achieve diffusion-tightness. These thin metallic layers effectively block gas diffusion while adding minimal thickness and weight to the pipe structure.
2Object-affected harmful factors
If a protective jacket is added to the pipe, then protection against external factors is improved, but heat exchange with the ground deteriorates due to additional insulation
Solution Approach 1:
The patent employs thin metallic coating films instead of thick protective jackets. These thin films provide necessary protection against external factors while minimizing thermal insulation effects, thus preserving efficient heat exchange between the pipe and ground.
Solution Approach 2:
The patent changes the thickness parameter of the protective layer from conventional thick jackets to thin metallic coatings (typically micrometer range). This parameter change maintains protective function while dramatically reducing thermal insulation effects that would hinder heat exchange.
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 solution creates a diffusion-tight geothermal probe system that prevents gas ingress, ensuring reliable operation and effective heat exchange with the ground without significantly impairing heat transport.
Implementation Method 1
the lateral surface of the geothermal probe base is at least partially coated with a metallic layer... which is essentially diffusion-tight... preventing gas diffusion
Implementation Method 2
the metallic layer according to the invention is preferably applied to the U-shaped geothermal probe base using a PVD process (physical vapor deposition), so that a thin but diffusion-tight metallic layer is created
Implementation Method 3
the heat transfer medium is heated by the geothermal energy conducted over the pipe wall
Data Source
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AI summary
The present invention relates to a ground source heat pump foot (5, 5') for a ground source heat pump (100) for connecting at least one inlet pipe (105) and at least one return pipe (110), wherein the ground source heat pump foot (5, 5') has at least one pipe bend deflected substantially by 180 degrees, characterized in that the outer surface of the ground source heat pump foot (5, 5') is at least partially coated with a metallic layer (35) or that the ground source heat pump foot (5, 5') consists substantially of a metallic material. The invention also relates to a ground source heat pump (100) which includes such a ground source heat pump foot (5, 5').