Working medium for heat cycle, composition for heat cycle system, and heat cycle system
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Solution Overview
Problem
Current working fluids for heat cycles, such as R410A, have high global warming potential and self-decomposition issues, necessitating the development of a fluid with low global warming potential and improved durability.
Innovation Solution
A working fluid composition containing trifluoroethylene (HFO-1123) and trifluoroiodomethane, with a mass ratio of 60-80%, combined with other hydrofluorocarbons or hydrofluoroolefins, to enhance cycle performance and suppress self-decomposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFO-1123 is used as a working fluid to reduce global warming potential, then environmental friendliness is improved, but self-decomposition occurs under high temperature or pressure conditions
Solution Approach 1:
The patent introduces CF3I (trifluoroiodomethane) as an intermediary substance that suppresses the self-decomposition of HFO-1123. The CF3I acts as a mediator in the chemical reactions, preventing the harmful decomposition of HFO-1123 under high temperature and pressure conditions while maintaining the low global warming potential of the working fluid mixture.
Solution Approach 2:
The patent creates a composite working fluid system by combining HFO-1123 with CF3I and other HFCs/HFOs. This composite mixture leverages the low GWP of HFO-1123 while using CF3I and complementary components to suppress self-decomposition and improve overall stability, achieving a balance between environmental performance and reliability.
2Productivity
If R410A is used as a working fluid, then cycle performance and refrigerating capacity are improved, but global warming potential increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters of the working fluid by replacing R410A (HFC-32/HFC-125 mixture with GWP 2088) with a new mixture containing HFO-1123 (GWP 103) combined with CF3I and other low-GWP components. This parameter change in composition achieves comparable refrigerating capacity while dramatically reducing global warming potential.
3Object-affected harmful factors
If HFO-1123 is used to replace R410A, then environmental impact is reduced, but durability under high temperature conditions deteriorates due to self-decomposition
Solution Approach 1:
CF3I serves as a protective intermediary that extends the durability of HFO-1123 by suppressing its self-decomposition under high temperature conditions. This intermediary substance allows HFO-1123 to maintain its environmental advantages while achieving the durability needed for practical long-term use in heat cycle systems.
Solution Approach 2:
The patent applies beforehand cushioning by pre-mixing CF3I with HFO-1123 before the heat cycle operation begins. This pre-combination creates a protective chemical environment that prevents self-decomposition from occurring in the first place under high temperature conditions, ensuring durability from the start of operation.
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 proposed fluid achieves excellent cycle performance, low global warming potential, and improved durability, effectively replacing R410A while minimizing self-decomposition reactions.
Implementation Method 1
HFO-1123 is known to undergo what is called a self-decomposition reaction when there is an ignition source at higher temperature or under high pressure
Implementation Method 2
hydrofluoroolefin (HFO), that is, HFC having a carbon-carbon double bond, which is a working fluid having less effect on the ozone layer and less effect on global warming because the carbon-carbon double bond is likely to be decomposed by OH radicals in the air
Data Source
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AI summary
A working fluid for a heat cycle, contains: trifluoroethylene; and a first component consisting of at least one of substance selected from carbon dioxide, fluoromethane, trifluoroiodomethane, methane, ethane, propane, helium, neon, argon, krypton, xenon, nitrogen and ammonia.