Zeotropic Refrigerant Loop for Thermoelectric Cooling
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Solution Overview
Problem
Current cooling systems for thermoelectric power generation consume large amounts of water, leading to environmental impact and increasing water scarcity, as they rely heavily on water-based cooling methods that result in significant water loss or heat-related environmental damage.
Innovation Solution
The implementation of a cooling system that utilizes a naturally circulated zeotropic refrigerant loop, which exchanges heat between a working fluid, a refrigerant, and air, minimizing water consumption by optimizing heat transfer efficiency and reducing the need for external power to circulate the fluid, thereby replacing conventional water-intensive cooling systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional water-based cooling systems are used, then heat transfer effectiveness is maintained, but water consumption increases significantly
Solution Approach 1:
The patent changes the physical parameters of the cooling system by replacing water with a zeotropic refrigerant mixture that has optimized thermal properties. The refrigerant mixture's specific heat capacity, thermal conductivity, and phase change characteristics are tailored to improve heat transfer efficiency while eliminating water consumption. This parameter change allows the system to maintain effective cooling without the harmful environmental impacts of water-based systems.
Solution Approach 2:
The zeotropic refrigerant acts as an intermediary substance between the heat source (exhaust gas) and the heat sink (condenser). Instead of directly using water to absorb heat, the refrigerant mediates the heat transfer process through its phase change and circulation cycle, enabling efficient heat removal from the thermoelectric generator while avoiding water consumption and associated environmental problems.
2Temperature
If evaporative cooling towers are used, then cooling capacity is increased, but water loss increases due to evaporation
Solution Approach 1:
The zeotropic refrigerant system is self-service in that it recirculates the refrigerant through evaporation and condensation cycles without requiring external water make-up. The refrigerant that evaporates in the heat exchanger condenses in the condenser and returns to repeat the cycle, creating a closed loop that eliminates water loss while maintaining continuous cooling capacity.
Solution Approach 2:
The system exploits phase transitions of the zeotropic refrigerant (evaporation from liquid to vapor, condensation from vapor to liquid) to transfer heat efficiently. During evaporation, the refrigerant absorbs heat from the exhaust gas, and during condensation, it releases heat to the environment. This phase change mechanism provides sustained cooling capacity without the water evaporation losses inherent in traditional cooling towers.
3Productivity
If once-through cooling is used, then cooling efficiency is maintained, but environmental impact increases due to heated water discharge
Solution Approach 1:
The zeotropic refrigerant serves as an intermediary that decouples the thermoelectric generator cooling process from direct water discharge. The refrigerant absorbs heat from the generator exhaust, transfers it through the condenser to ambient air, and returns to repeat the cycle. This intermediary approach maintains cooling efficiency while eliminating the harmful thermal pollution associated with once-through water cooling systems.
Solution Approach 2:
The patent extracts the heat transfer function from water-based systems and relocates it to a zeotropic refrigerant cycle. By taking out the cooling function and implementing it through a separate refrigerant loop, the system achieves the same cooling efficiency without discharging heated water into the environment, thereby eliminating thermal pollution and associated environmental impacts.
4Ease of operation
If external power is used to circulate cooling fluid, then flow control is improved, but energy consumption increases
Solution Approach 1:
The zeotropic refrigerant system is self-service, utilizing natural convection and density differences driven by phase change to circulate the refrigerant through the system. The evaporating refrigerant becomes less dense and rises to the condenser, where it condenses and becomes denser, naturally sinking back to the heat exchanger. This self-circulating mechanism eliminates or minimizes the need for external pumps and power consumption while maintaining effective flow control.
Solution Approach 2:
The system uses buoyancy forces generated by density differences in the refrigerant (lighter vapor rising, heavier liquid falling) to counteract gravity and drive circulation. This natural circulation approach, driven by the refrigerant's own weight differences during phase change, replaces mechanical pumping systems and significantly reduces energy consumption while maintaining proper flow distribution throughout the cooling system.
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 significantly reduces water consumption in thermoelectric power plants by enhancing heat transfer effectiveness and decreasing the amount of water required for cooling, while also minimizing energy consumption associated with water handling and environmental impact.
Implementation Method 1
The second condenser and evaporator are configured to circulate a zeotropic refrigerant by natural circulation therebetween thereby transferring heat from the refrigerant to the air
Implementation Method 2
The first condenser is further configured to exchange heat between the working fluid and the refrigerant
Implementation Method 3
removing heat from a working fluid by exchanging heat with a refrigerant
Implementation Method 4
The second condenser and evaporator are configured to circulate a zeotropic refrigerant by natural circulation therebetween thereby transferring heat from the refrigerant to the air
Data Source
AI summary
Systems and methods for cooling a power generation working fluid are disclosed that reduce the amount of cooling fluid used. These systems and methods save on water usage in the generation of power by thermoelectric power generation systems.