Dielectric Heat Transfer Fluids for Large Temperature Differences
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Solution Overview
Problem
Existing refrigeration technologies face limitations in efficiently managing large temperature differences and energy efficiency, particularly in processes involving liquid-liquid phase transitions, which are not adequately addressed by conventional methods.
Innovation Solution
The implementation of a refrigeration cycle utilizing liquid-liquid phase transitions, powered by electricity, heat, or osmotic pressure differences, with adjustable phase transition temperatures, enables efficient heat transfer and gas separation, reducing operational and capital expenditures by employing reversible endothermic and exothermic phase transitions across separate temperature zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If conventional refrigeration technologies are used, then the system can operate with simple design, but the energy efficiency deteriorates when managing large temperature differences
Solution Approach 1:
The patent employs liquid-liquid phase transitions of organic compounds to enable efficient heat transfer at large temperature differences. The phase transition materials absorb and release latent heat during transitions, allowing the system to manage temperature differences greater than adiabatic temperature changes while maintaining high energy efficiency without requiring complex mechanical compression systems
Solution Approach 2:
The system utilizes changes in physical parameters (temperature, pressure, phase state) of organic dielectric fluids to achieve heat transfer. By controlling the phase transition temperature and pressure parameters of the organic compounds, the system can operate across different temperature zones efficiently, resolving the contradiction between energy efficiency and system complexity
2Use of energy by stationary object
If liquid-liquid phase transitions are implemented to pump heat across large temperature differences, then energy efficiency improves, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into the organic dielectric heat transfer fluid itself: the fluid serves as both the working medium for phase transition heat transfer and the dielectric medium for electrical power transmission. This merging eliminates the need for separate systems, reducing overall device complexity while maintaining high energy efficiency in pumping heat across large temperature differences
Solution Approach 2:
The organic dielectric fluid performs multiple functions simultaneously: heat transfer through phase transitions, electrical insulation, and power transmission medium. This multi-functionality reduces the number of separate components needed in the refrigeration cycle, thereby reducing device complexity while achieving improved energy efficiency
3Productivity
If organic dielectric heat transfer fluids are used, then heat transfer efficiency improves, but the selection of suitable materials becomes more difficult
Solution Approach 1:
The patent systematically varies molecular parameters of organic compounds (carbon chain length, functional groups, molecular weight) to achieve desired phase transition temperatures and dielectric properties. By establishing structure-property relationships, the invention makes material selection more systematic and easier, while maintaining high heat transfer efficiency through optimized molecular structures
Solution Approach 2:
The invention employs composite organic molecules combining hydrocarbon chains with functional groups to achieve both desirable thermal properties (phase transition temperature, latent heat) and electrical properties (dielectric strength, conductivity). These composite molecular structures enable simultaneous optimization of heat transfer efficiency and ease of material selection through systematic molecular design
4Loss of energy
If reversible endothermic and exothermic phase transitions are employed across separate temperature zones, then operational expenditures reduce, but the system complexity increases
Solution Approach 1:
The refrigeration system is divided into separate temperature zones (first temperature zone for endothermic transition, second temperature zone for exothermic transition) connected by heat exchangers. This segmentation allows independent optimization of each zone while recovering heat between zones, reducing operational energy losses without requiring overly complex integrated systems
Solution Approach 2:
The system implements heat recovery feedback between temperature zones: heat released during exothermic phase transition in the second zone is fed back to support the endothermic transition in the first zone. This feedback mechanism reduces external energy input requirements and operational expenditures while maintaining manageable system complexity through natural heat flow utilization
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 generates temperature differences greater than the adiabatic change of liquid-liquid phase transitions, enhancing energy efficiency and reducing costs in refrigeration and gas separation processes.
Implementation Method 1
liquid-liquid phase transitions, which are not adequately addressed by conventional methods
Implementation Method 2
generates temperature differences greater than the adiabatic change of liquid-liquid phase transitions
Implementation Method 3
powered by electricity, heat, or osmotic pressure differences
Implementation Method 4
reversible endothermic and exothermic phase transitions across separate temperature zones
Implementation Method 5
reversible endothermic and exothermic phase transitions across separate temperature zones
Data Source
AI summary
The present applications pertains to heat transfer fluids and processes of employing them to, for example, cool electronic devices. In one embodiment, the heat transfer fluids include an alkylene carbonate and at least one organic solvent. Suitable organic solvents include, for example, an alkylene glycol or a glycol ether. The fluids typically are dielectric liquids with less than 30 weight percent of water. Advantageously, the fluids often have an effective beat capacity greater than water which is useful for cooling an electronic device such as a battery, a computer, a server, and the like.