Anhydrous Heat Transfer Medium for Zero-Work Cooling
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Solution Overview
Problem
Existing heat transfer mediums, such as chlorofluorocarbons, have detrimental environmental effects due to ozone depletion and global warming potential, and their alternatives are becoming environmentally unacceptable as regulations tighten.
Innovation Solution
A novel anhydrous heat transfer medium with near 0 ozone depletion potential and less than 500 global warming potential, utilizing compounds like cis-1-chloro-3,3,3-trifluoropropene and perfluorobutane methyl ether, which operates through natural convection and thermosiphon phenomena without requiring external work, ensuring non-flammability and non-electrical conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional chlorofluorocarbons are used as heat transfer medium, then heat transfer efficiency is achieved, but ozone depletion occurs
Solution Approach 1:
The patent changes the chemical composition parameters of the heat transfer medium by using hydrofluoroolefin compounds (specifically 1,1,1,4,4,4-hexafluorobut-2-ene and 1-chloro-3,3,3-trifluoroprop-1-ene) instead of traditional chlorofluorocarbons. This chemical substitution maintains the heat transfer functionality while eliminating the ozone-depleting chlorine atoms, thus resolving the contradiction between heat transfer efficiency and ozone protection.
Solution Approach 2:
The patent converts the previously harmful property of high global warming potential into a beneficial feature by selecting compounds with specifically controlled GWP values (less than 500). The patent acknowledges the environmental concerns and transforms the selection criteria to choose compounds that, while having some GWP, are significantly lower than traditional alternatives, thus turning an environmental liability into a controlled, acceptable parameter.
2Object-affected harmful factors
If hydrochlorofluorocarbons are used as alternatives, then ozone depletion potential is reduced, but global warming contribution increases
Solution Approach 1:
The patent carefully selects hydrofluoroolefin compounds with specific molecular structures that eliminate chlorine (achieving near-zero ODP) while controlling the fluorine content and molecular weight to limit GWP to less than 500. This precise parameter control allows the patent to improve upon both environmental metrics simultaneously by moving beyond the HCFC compromise solution.
3Productivity
If heat pump or refrigeration system is used for heat transfer, then heat transfer capability is achieved, but external work is required
Solution Approach 1:
The patent employs the thermosiphon effect where the heat transfer medium automatically circulates through phase change and natural convection without external power input. The system uses its own thermal energy to drive the circulation: liquid evaporates at the hot end, vapor rises and condenses at the cold end, and the condensed liquid returns to the hot end under gravity, creating a self-sustaining heat transfer cycle that eliminates the need for compressors or external work.
Solution Approach 2:
The patent utilizes the phase transition properties of the heat transfer medium between liquid and vapor states to enable automatic circulation. The phase change at the evaporation and condensation points, combined with natural convection currents, drives the heat transfer process without mechanical intervention, resolving the contradiction between heat transfer capability and external work requirements.
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 solution provides an environmentally friendly heat transfer medium that effectively removes heat without damaging electronic devices in case of leakage, occupying minimal space, and achieving efficient heat transfer with low operating pressure and vapor rate, while adhering to stringent environmental regulations.
Implementation Method 1
absorbing the heat from the heat source, the heat transfer medium in the container partially or completely evaporates
Implementation Method 2
The vapor releases its heat to the environment, condenses and then joins the heat transfer medium at the bottom of the container
Implementation Method 3
the heat transfer medium is applied to a heat transfer or heat removal element having natural convection and thermo siphon phenomenon
Implementation Method 4
the heat transfer medium is applied to a heat transfer or heat removal element having natural convection and thermo siphon phenomenon
Data Source
AI summary
An anhydrous heat transfer medium, comprising any one or a combination of at least two of cis-1-chloro-3,3,3-trifluoropropene, cis-1,1,1,4,4,4-hexafluorobutene or perfluorobutane methyl ether. The heat transfer medium does not require an external device to perform work on the heat transfer medium during a heat transfer process, and is anhydrous, non-combustible, non-conductive and environmentally friendly.