Composition for heat cycle system, and heat cycle system
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Solution Overview
Problem
Trifluoroethylene (HFO-1123) used as a working fluid in heat cycle systems is unstable under compression and heating conditions, leading to self-decomposition and reduced performance, while existing alternatives have high global warming potential or are not environmentally friendly.
Innovation Solution
A composition for a heat cycle system comprising trifluoroethylene with a stabilizer, such as phenol compounds or aromatic amines, to prevent deterioration and improve stability, combined with other hydrofluorocarbons like difluoromethane or 1,3,3,3-tetrafluoropropene to maintain low global warming potential and enhance cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If trifluoroethylene (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 stability deteriorates due to self-decomposition under compression and heating conditions
Solution Approach 1:
A stabilizer is introduced as an intermediary substance to prevent the self-decomposition of trifluoroethylene during compression and heating. The stabilizer acts as a mediator that protects the working fluid from deteriorating while allowing the system to maintain low GWP and excellent cycle performance.
Solution Approach 2:
The stabilizer is added in advance to the working fluid composition before the heat cycle operations begin. This preliminary action ensures that the trifluoroethylene is protected from decomposition at the molecular level before any compression or heating occurs, preventing deterioration rather than addressing it after the fact.
2Object-affected harmful factors
If trifluoroethylene is used as a working fluid to achieve low global warming potential, then environmental impact is reduced, but lifespan is shortened due to self-decomposition
Solution Approach 1:
The stabilizer serves as a protective intermediary that extends the lifespan of trifluoroethylene by preventing its self-decomposition during repeated compression and heating cycles, allowing the working fluid to maintain its effectiveness over a longer duration while preserving its low GWP characteristics.
3Productivity
If trifluoroethylene is used as a working fluid to achieve excellent cycle performance, then cycle performance is improved, but stability worsens under repeated compression and heating conditions
Solution Approach 1:
The working fluid is formulated as a composite composition containing trifluoroethylene combined with a stabilizer. This composite approach allows the system to achieve excellent cycle performance from the trifluoroethylene while the stabilizer component prevents decomposition, thereby maintaining stability under repeated compression and heating conditions.
Data Source
AI summary
To provide a composition for a heat cycle system, which comprises a working fluid for heat cycle which has a low global warming potential and high stability, and which can replace R410A, and a heat cycle system employing the composition.A composition for a heat cycle system, which comprises a working fluid for heat cycle containing trifluoroethylene, and a stabilizer for preventing deterioration of the working fluid for heat cycle, such as an oxidation resistance-improving agent, a heat resistance-improving agent or a metal deactivator, and a heat cycle system employing the composition for a heat cycle system.