Heat cycle system composition and heat cycle system
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Solution Overview
Problem
Current working fluids for heat cycle systems, such as HFO-1123, face issues with self-decomposition under high temperature and pressure conditions, leading to instability and short lifespan, which affects the durability and ozone layer impact, while alternatives like HFCs have high global warming potential.
Innovation Solution
A composition comprising trifluoroethylene and difluoromethane with a phosphoric acid ester, where the interaction distance is optimized, enhancing stability and reducing global warming potential, and incorporating additional hydrofluoroolefins for improved cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFO-1123 is used as a working fluid, then the ozone layer influence is reduced and GWP is lowered, but the stability deteriorates due to self-decomposition under high temperature and pressure conditions
Solution Approach 1:
The patent introduces a lubricating oil as an intermediary substance that interacts with HFO-1123 to suppress its self-decomposition. The lubricating oil forms a protective film or chemical interaction that stabilizes the working fluid under high temperature and pressure conditions, allowing HFO-1123 to maintain its environmental benefits while improving reliability
Solution Approach 2:
The patent creates a composite working fluid system by combining HFO-1123 with specific lubricating oils. This composite approach allows the system to leverage the low GWP and ozone-friendly properties of HFO-1123 while the lubricating oil component provides stability and prevents decomposition under operating conditions
2Quantity of substance
If HFO-1123 is used as a working fluid, then the GWP is reduced, but the durability deteriorates due to short lifespan under repeated compression and heating conditions
Solution Approach 1:
The lubricating oil serves as a mediator that protects HFO-1123 from degradation during repeated compression and heating cycles. It absorbs or mitigates the harsh conditions that would otherwise cause the working fluid to decompose rapidly, thereby extending the system's operational lifespan
Solution Approach 2:
The lubricating oil provides beforehand cushioning by forming a protective barrier or chemical buffer before the HFO-1123 is exposed to extreme conditions. This pre-established protection prevents decomposition during the first exposure to high temperature and pressure, and continues to protect during subsequent cycles
3Object-affected harmful factors
If HFCs are used as a working fluid, then the ozone layer influence is reduced, but the GWP increases due to high global warming potential
Solution Approach 1:
The patent changes the chemical composition parameter of the working fluid from conventional HFCs to HFO-1123, which has fundamentally different environmental properties. This parameter change results in lower GWP and reduced ozone layer impact, while the lubricating oil component ensures the system remains practical and stable
Data Source
Figure 1~2
AI summary
To provide a composition for a heat cycle system having less influence over the ozone layer, having a low global warming potential and having excellent stability and durability, and a heat cycle system. A composition for a heat cycle system, which comprises a working fluid containing trifluoroethylene and difluoromethane, and a phosphoric acid ester, wherein the interaction distance (Ra) between the working fluid and the phosphoric acid ester as determined from the Hansen solubility parameters is at most 15.