Passive Solar TEG Co-Generator With Interfacial Cooling
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Solution Overview
Problem
Existing solar water and energy co-generators face inefficiencies due to salt fouling, reduced evaporation rates, and optical losses from transparent covers, leading to decreased electricity and water production over time, with limited material selection and universality in practical applications.
Innovation Solution
A hybrid system incorporating a thermoelectric generator (TEG) layer, an absorber layer for solar energy conversion to heat, and a passive interfacial cooling structure with metal plates and a porous evaporator to form an interfacial cooling region, enhancing energy exchange and heat management for efficient electricity and water generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent cover is used above the solar evaporator for vapor condensation, then condensation is facilitated, but optical loss increases significantly (up to 35%) and efficiency is reduced
Solution Approach 1:
The patent removes the transparent cover component from the system entirely. Instead of using a cover-based condensation approach, the system employs the side walls of the container as condensation surfaces, eliminating the optical loss issue while maintaining condensation functionality.
Solution Approach 2:
The side walls of the container serve as an intermediary surface for condensation. Water vapor condenses on the cooler side walls rather than requiring a separate transparent cover, facilitating heat transfer and condensation without optical interference.
2Productivity
If continuous desalination is performed, then water production is maintained, but salt precipitation compromises sunlight absorption and reduces evaporation rate
Solution Approach 1:
The system periodically removes accumulated salt from the evaporator surface through manual or automated cleaning mechanisms. This discarding of salt deposits restores the evaporator's optical properties and evaporation efficiency, allowing continuous operation without permanent performance degradation.
Solution Approach 2:
The system implements periodic cleaning cycles where the evaporator surface is cleaned at regular intervals to remove salt deposits. This periodic maintenance restores absorption efficiency and evaporation rate, enabling sustained productivity over long operation periods.
3Duration of action of moving object
If long-term operation is continued, then sustained water and electricity generation is achieved, but bulk water warming decreases temperature difference across TEG module
Solution Approach 1:
The system pre-cools the bulk water reservoir before operation begins and maintains cooling during operation using the condensation process. By preparing the thermal conditions in advance and actively managing temperature during operation, the system sustains the temperature gradient needed for TEG power generation over extended periods.
Solution Approach 2:
The system monitors temperature difference across the TEG module and adjusts operation parameters accordingly. When the temperature gradient decreases due to bulk water warming, the system can adjust water flow rates, solar exposure, or activate additional cooling mechanisms to maintain optimal power generation performance.
4Device complexity
If salt-fouling is allowed to occur, then system structure is simple, but sunlight absorption is compromised and evaporation rate is reduced
Solution Approach 1:
The evaporator surface uses a hydrophobic thin film or coating that prevents salt adhesion. This thin protective layer maintains optical transparency while preventing salt fouling, allowing the system to remain structurally simple without sacrificing evaporation performance.
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 hybrid system achieves high efficiency in electricity and water production with improved long-term stability and adaptability, maintaining performance across various solutions and conditions, including high salt concentrations and organic contaminants, through effective heat dissipation and energy integration.
Implementation Method 1
an absorber layer arranged on one side of the TEG layer for converting solar energy to heat
Implementation Method 2
a thermoelectric generator (TEG) layer for converting heat to electricity
Implementation Method 3
a cooling structure arranged on the other side of the TEG layer for dissipating a waste heat from the TEG layer
Implementation Method 4
an evaporator configured to form an interfacial cooling region with the cooling structure for water generation
Data Source
AI summary
There is provided a hybrid system for electricity and water generation, that includes a thermoelectric generator (TEG) layer for converting heat to electricity, an absorber layer arranged on one side of the TEG layer for converting solar energy to heat, a cooling structure arranged on the other side of the TEG layer for dissipating a waste heat from the TEG layer, and an evaporator configured to form an interfacial cooling region with the cooling structure for water generation.