Geoexchange systems including ground source heat exchangers and related methods
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Solution Overview
Problem
Existing geoexchange systems are expensive, difficult to install, prone to failure, and challenging to service or expand, leading to underutilization of geothermal resources.
Innovation Solution
The development of robust ground source heat exchangers in the form of metallic vessels that can serve as deep foundation members, coupled with a distribution system and a fill circuit for automatic replenishment of the heat transfer medium, allowing for easy installation, reconfiguration, and maintenance, and enabling efficient heating and cooling functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional polyethylene piping is used in the ground source heat exchanger, then the system can be installed, but it is prone to leakage and failure
Solution Approach 1:
The patent employs a replaceable polyethylene pipe section within the ground source heat exchanger. When leakage occurs, only the damaged pipe section needs to be replaced rather than the entire system. The pipe sections are designed to be modular and accessible, allowing field replacement without excavating the entire installation. This approach accepts that the pipe has a limited service life but makes the system economically viable through easy, low-cost replacement.
2Productivity
If the ground source heat exchanger is installed deep in the ground, then heating and cooling efficiency is improved, but installation becomes more difficult and expensive
Solution Approach 1:
The ground source heat exchanger is divided into multiple modular sections that can be installed incrementally. Each section contains a manageable length of polyethylene pipe within a metallic vessel, allowing the system to be assembled and installed in manageable units rather than as a single complex deep installation. This segmentation reduces installation difficulty while maintaining the deep ground placement necessary for thermal efficiency.
Solution Approach 2:
The patent combines the polyethylene pipe with a metallic vessel to create a composite ground source heat exchanger section. The metallic vessel provides structural strength for deep installation while the polyethylene pipe provides the fluid conduit. This merging allows the system to achieve both deep ground placement for efficiency and easier installation through the reinforced structure.
3Adaptability or versatility
If the system is designed to be expandable, then future capacity increases are possible, but the initial system complexity increases
Solution Approach 1:
The ground source heat exchanger is designed as a modular system with standardized sections that can be easily added or removed. Each module contains complete functionality (metallic vessel, polyethylene pipe, connectors), allowing the system to be expanded by simply adding more modules to the existing configuration without redesigning the entire system.
Solution Approach 2:
The patent creates a universal mounting structure and connector system that works across all ground source heat exchanger sections. This standardized interface allows different numbers and configurations of sections to be interconnected using the same hardware and procedures, simplifying expansion while maintaining system integrity.
4Reliability
If metallic vessels are used instead of traditional piping, then leakage resistance is improved, but cost and manufacturing complexity increase
Solution Approach 1:
The patent merges the metallic vessel (for leakage resistance and structural strength) with the polyethylene pipe (for fluid conduction and flexibility) into a single integrated ground source heat exchanger section. This combination allows the system to benefit from both materials' advantages while keeping manufacturing costs manageable through modular production and field assembly.
Solution Approach 2:
The polyethylene pipe within the metallic vessel is designed as a replaceable, cost-effective component. If leakage occurs, the inexpensive polyethylene section can be replaced without replacing the entire metallic vessel structure. This approach uses a cheap, short-living component (the polyethylene pipe) protected by a more durable metallic vessel, optimizing both reliability and cost.
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 provides a versatile, efficient, and cost-effective geoexchange system that can be easily expanded and maintained, enhancing the utilization of geothermal resources for heating and cooling applications.
Implementation Method 1
a ground source heat exchanger in the form of a metallic vessel that defines an internal fluid cavity... to circulate a heat transfer medium (preferably water) through the internal fluid cavity of the ground source heat exchanger during operation
Implementation Method 2
geoexchange systems including ground source heat exchangers and related methods that utilize the earth as a heat sink and/or heat source
Implementation Method 3
a check valve to introduce supplemental water into the ground source loop from a supplemental water source in response to an existence of a pressure differential across the check valve that exceeds a selected threshold
Implementation Method 4
The distribution system may further include a purge valve to release gas from the distribution system. The purge valve may be located at or proximate the highest point or elevation in the ground source loop
Data Source
AI summary
A geoexchange system is provided which includes a ground source heat exchanger positioned in the ground and a distribution system coupled to the ground source heat exchanger to circulate water through the ground source heat exchanger during operation. The distribution system may include a supply line, a return line and a circulation pump to circulate water through the internal fluid cavity of the ground source heat exchanger via the supply and return lines. The distribution system may further include a purge valve to release gas from the distribution system and a fill circuit that is configured to automatically replenish the internal fluid cavity of the ground source heat exchanger with water upon leakage of water from the ground source heat exchanger or conversion of water from the ground source heat exchanger to gas. Other geoexchange systems and related methods are also provided.