Systems and methods for improving the performance of air-driven generators using solar thermal heating
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Solution Overview
Problem
Current systems for compressing gaseous fluids, such as air, face inefficiencies in thermodynamic performance and energy conservation, limiting the advancement of air-driven generator systems in converting low-grade heat into electrical power.
Innovation Solution
The air-driven generator system incorporates a closed fluid loop with elongate gravitational and buoyancy conduits, a liquid turbine, and a thermal heating system using solar thermal energy to increase the temperature of the working liquid, enhancing the expansion of air and thereby increasing power output or reducing the air mass required for compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional compression systems are used for gaseous fluids, then the system structure is simple, but the thermodynamic performance and energy efficiency are poor
Solution Approach 1:
The compression system is divided into multiple stages with intermediate cooling, where air is compressed in stages rather than in a single step. This segmentation allows heat to be removed between stages, improving overall efficiency while maintaining manageable system complexity through modular design
Solution Approach 2:
The system changes the physical parameters of the working fluid by preheating the air before compression and cooling it between stages. This parameter modification improves thermodynamic efficiency by reducing the work required for compression and enabling better heat recovery opportunities
2Use of energy by moving object
If solar thermal heating is added to preheat air before compression, then energy efficiency improves, but device complexity increases
Solution Approach 1:
The solar thermal system serves multiple functions: preheating air for compression, providing process heat for other system components, and potentially storing thermal energy for later use. This multi-functionality justifies the added complexity by delivering multiple benefits from a single subsystem
Solution Approach 2:
The system uses waste heat from compression and other processes to preheat incoming air, creating a self-sustaining thermal cycle. This self-service approach recovers energy that would otherwise be lost, improving efficiency without requiring additional external energy inputs
3Power
If multi-stage compression with intercooling is implemented, then thermodynamic performance improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The compression process is segmented into multiple stages, each with its own cooler and control system. This allows each component to be designed and manufactured independently at optimal scales, simplifying production while achieving superior overall performance
Solution Approach 2:
Intercoolers serve as intermediary components between compression stages, removing heat and preparing the air for the next stage. These intermediary elements enable the system to achieve high power output by managing thermal loads progressively rather than all at once
4Loss of energy
If heat recovery systems are integrated into the compression process, then energy conservation improves, but device complexity increases
Solution Approach 1:
Heat recovery systems capture thermal energy from compression exhaust and other process streams, feeding this recovered heat back into the system to preheat incoming air or provide process heat. This feedback loop continuously reduces energy losses while the integrated design minimizes the complexity penalty through shared infrastructure
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 configuration efficiently converts low-grade heat into electrical power by maintaining thermal equilibrium and increasing the weight difference across the turbine, resulting in higher power output and reduced air compression needs, while also utilizing regenerative heat exchangers to recapture lost energy.
Implementation Method 1
a thermal heating system using solar thermal energy to increase the temperature of the working liquid
Implementation Method 2
The thermal heating system is thermally coupled with a second heat exchanger to move the captured thermal energy into the working liquid
Implementation Method 3
Each buoyancy conduit has an upper end and a lower end. The upper ends of the elongate buoyancy conduits are in fluidic communication with the upper end of the elongate gravitational distribution conduit, and the lower end of the elongate gravitational distribution conduit is in fluidic communication with the lower ends of the elongate plural buoyancy conduits
Implementation Method 4
Working liquid flowing downwardly through the elongate gravitational distribution conduit being fed from the lower end of the elongate gravitational distribution conduit into the lower ends of the plural elongate buoyancy conduits
Data Source
AI summary
An air-driven generator system for generating electric power from movement of a working liquid. The system includes an air-driven generator that includes a liquid turbine system fluidically interposed between the lower end of an elongate gravitational distribution conduit and the lower ends of plural elongate buoyancy conduits. A heavy working liquid flows from the upper ends of the buoyancy conduits and is fed into the upper end of the elongate gravitational distribution conduit. Working liquid flows down the elongate gravitational distribution conduit to actuate the liquid turbine system. An injection of air into the working liquid in the plural elongate buoyancy conduits induces upward flow of the working liquid. The system includes a solar thermal heating system fluidically coupled to heat exchangers that transfer heat collected by the solar thermal heating system to the working fluid through a thermal transfer fluid circuit.