Direct Exchange Geothermal Refrigerant Loop for Shallow Power Generation
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Solution Overview
Problem
Conventional geothermal power production systems are limited by the need for unique geological conditions, require multiple fluid loops and pumps, and often involve environmental challenges, making them economically and environmentally costly.
Innovation Solution
A direct exchange geothermal power generation system using a single closed refrigerant loop that utilizes naturally occurring geothermal heat to directly vaporize and pressurize a refrigerant with a lower boiling point than water, eliminating the need for high-temperature water loops and reducing the number of heat exchange steps, and optionally incorporating an air-source or water-source condenser and heat pump system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional binary geothermal systems use water loops and multiple heat exchange steps, then heat transfer reliability is improved, but device complexity increases and installation costs increase
Solution Approach 1:
The patent combines the primary heat acquisition loop and power generation loop into a single integrated refrigerant loop. The refrigerant serves dual purposes: absorbing geothermal heat directly from the well and driving the turbine for power generation. This eliminates the need for separate water loops and multiple heat exchangers, reducing system complexity while maintaining heat transfer reliability through direct exchange.
Solution Approach 2:
The patent extracts and eliminates intermediate heat transfer components (separate water loops, multiple heat exchangers) from the conventional binary system. By removing these unnecessary intermediate steps, the system achieves direct heat exchange from geothermal source to refrigerant to turbine, simplifying the overall system architecture while preserving essential heat transfer functions.
2Productivity
If conventional geothermal systems use multiple fluid loops and pumps, then heat exchange efficiency is improved, but loss of substance increases due to fluid loss
Solution Approach 1:
The patent merges multiple fluid loops into a single closed refrigerant loop that performs both heat acquisition and power generation functions. This single-loop design eliminates fluid loss associated with multiple separate loops while maintaining heat exchange efficiency through direct refrigerant-to-geothermal heat transfer and direct expansion through the turbine.
Solution Approach 2:
The patent changes the working fluid from water to refrigerant with optimized thermodynamic properties. The refrigerant's lower boiling point and higher volatility enable efficient heat absorption at lower temperatures and pressures, improving heat exchange efficiency while the closed-loop design prevents fluid loss. The refrigerant parameters are selected to maximize efficiency in direct exchange conditions.
3Power
If flash steam systems use high-temperature water from deep wells, then power generation capability is improved, but drilling depth increases and installation costs increase
Solution Approach 1:
The patent changes the working fluid parameters from water to refrigerant with lower boiling point and higher volatility. This parameter change allows the system to achieve sufficient vapor pressure for power generation at shallower depths and lower temperatures, eliminating the need for extremely deep wells required by conventional flash steam systems while maintaining power generation capability.
Solution Approach 2:
Instead of using high-temperature water and flashing it to steam as in conventional systems, the patent inverts the approach by using low-temperature refrigerant that directly absorbs heat and vaporizes. This inversion allows power generation at lower temperatures and shallower depths, reversing the conventional requirement for extreme heat and depth conditions.
4Quantity of substance
If conventional geothermal systems use water as working fluid, then heat transfer capacity is improved, but adaptability decreases due to geological limitations
Solution Approach 1:
The patent changes the working fluid from water to refrigerant with adjustable thermodynamic parameters. The refrigerant's lower boiling point, higher volatility, and tunable properties allow the system to adapt to various geological conditions and temperature ranges, expanding versatility beyond the limitations of water-based systems while maintaining adequate heat transfer capacity.
Solution Approach 2:
The patent creates a universal geothermal power system using refrigerant that can operate across diverse geological conditions. The refrigerant-based direct exchange system serves multiple functions: heat absorption, vaporization, power generation, and adaptation to varying temperatures, making the system versatile and applicable in locations where conventional water-based systems cannot operate.
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 approach allows for geothermal power production nearly anywhere, reducing installation costs and environmental impact by using a single loop system with lower drilling depths and no fluid loss, increasing efficiency and cost-effectiveness.
Implementation Method 1
naturally occurring geothermal heat to directly vaporize and pressurize a refrigerant with a lower boiling point than water
Implementation Method 2
geothermal heat to directly vaporize and pressurize a refrigerant
Implementation Method 3
incorporating an air-source or water-source condenser
Data Source
AI summary
A single closed loop direct exchange geothermal power production system that utilizes a refrigerant working fluid in at least one of three primary designs to generate electrical power from deep wells: with a first version of a direct exchange geothermal power generating system operating primarily on refrigerant vapor pressure; with a second version of a direct exchange geothermal power generating system operating primarily on liquid refrigerant gravitational pressure; and with a third version of a direct exchange geothermal power generating system operating primarily on both liquid refrigerant gravitational pressure and refrigerant phase change/expansion from a liquid to a vapor state.