Composition for heat cycle systems, and heat cycle system
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current working fluids for heat cycle systems, such as HFCs, have high global warming potential and are prone to self-decomposition reactions, which can lead to reduced durability and performance, especially when used in heat cycle systems like refrigeration and air-conditioning apparatuses.
Innovation Solution
A composition for a heat cycle system comprising trifluoroethylene (HFO-1123) is developed, which includes a radical scavenger that generates halogen atoms or perfluoroalkyl radicals to suppress self-decomposition reactions, thereby maintaining low global warming potential and enhancing cycle performance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFO-1123 is used as a working fluid to achieve low global warming potential and excellent cycle performance, then global warming impact is reduced and cycle performance is improved, but self-decomposition reaction occurs leading to reduced durability
Solution Approach 1:
A radical scavenger is introduced as an intermediary substance to intercept and neutralize free radicals generated during HFO-1123 decomposition. The radical scavenger acts as a mediator between the working fluid and decomposition products, preventing the chain reaction that leads to self-decomposition and improving system durability while maintaining the low GWP benefits of HFO-1123.
Solution Approach 2:
The invention converts the harmful self-decomposition reaction into a beneficial process by controlling it through radical scavenging. The controlled decomposition allows the system to benefit from HFO-1123's excellent thermodynamic properties while the radical scavenger captures the harmful free radicals, transforming what would be a destructive process into a manageable one that enhances overall system reliability.
2Object-affected harmful factors
If HFO-1123 is used to achieve low global warming potential, then environmental impact is reduced, but self-decomposition reaction occurs causing heat generation and performance degradation
Solution Approach 1:
The radical scavenger serves as an intermediary that intercepts free radicals before they can propagate exothermic decomposition reactions. By capturing these radicals early in the decomposition process, the scavenger prevents the chain reaction that would otherwise generate excessive heat and degrade system performance, while allowing HFO-1123 to maintain its low global warming potential.
3Stability of the object's composition
If conventional stabilizers are used in the composition, then basic stability is provided, but they are insufficient to suppress self-decomposition reaction of HFO-1123
Solution Approach 1:
The invention changes the chemical parameter of the stabilizer by selecting compounds with specific radical-scavenging capabilities. Instead of using conventional stabilizers with generic stabilizing properties, the patent employs substances specifically chosen for their ability to capture free radicals through their molecular structure and reactivity characteristics, thereby achieving effective suppression of HFO-1123 self-decomposition.
Solution Approach 2:
The composition creates a composite system combining HFO-1123 with specifically selected radical scavengers. This composite approach integrates the low-GWP working fluid with functional additives that provide targeted protection against decomposition, achieving a synergistic effect where the combination provides superior stability and reliability compared to the working fluid alone.
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 composition effectively suppresses self-decomposition reactions, ensuring high durability and performance of the heat cycle system while reducing global warming impact by using a radical scavenger that traps active species generated during the decomposition process, thus preventing heat generation and maintaining efficient operation.
Implementation Method 1
a radical scavenger that generates halogen atoms or perfluoroalkyl radicals to suppress self-decomposition reactions
Implementation Method 2
a radical scavenger that traps active species generated during the decomposition process
Implementation Method 3
the carbon-carbon double bond is likely to be decomposed by OH radicals in the air
Data Source
Figure 1~2
Figure 3
AI summary
To provide a composition for a heat cycle system comprising trifluoroethylene (HFO-1123), which has a low global warming potential and excellent cycle performance of HFO-1123 and which has high durability, and a heat cycle system employing the composition, which has less influence over global warming and has both high cycle performance and durability. A composition for a heat cycle system, which comprises a working fluid for heat cycle containing trifluoroethylene, and a radical scavenger, and a heat cycle system employing the composition for a heat cycle system.