Heat Cycle Fluid Composition for Low-GWP Lubricity and Stability
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Solution Overview
Problem
Current heat cycle systems using trifluoroethylene (HFO-1123) face instability under compression and heating, leading to poor lubricity and cycle performance compared to saturated hydrofluorocarbons, while existing alternatives have high global warming potential (GWP).
Innovation Solution
A composition comprising trifluoroethylene, difluoromethane, and (E)-1,3,3,3-tetrafluoropropene, combined with a refrigerant oil, specifically ester, ether, or polyglycol oils, to enhance lubricity and maintain low GWP and excellent cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If trifluoroethylene (HFO-1123) is used as a working fluid, then low global warming potential and excellent cycle performance are achieved, but stability under compression and heating deteriorates and lubricating properties decrease
Solution Approach 1:
The patent uses a composite working fluid system comprising trifluoroethylene (HFO-1123) combined with specific refrigerant oils (ester, ether, or polyglycol oils) and auxiliary components. This composite approach allows HFO-1123 to provide low GWP and excellent cycle performance while the refrigerant oil compensates for insufficient lubricating properties and the combination enhances overall stability under compression and heating conditions.
Solution Approach 2:
The patent introduces refrigerant oil as an intermediary substance that mediates between the working fluid (trifluoroethylene) and the system components. The refrigerant oil provides the necessary lubricating properties to compressors and other moving parts, while allowing the HFO-1123 to maintain its excellent thermodynamic performance and low environmental impact.
2Productivity
If trifluoroethylene (HFO-1123) is used as a working fluid, then low global warming potential and excellent cycle performance are achieved, but lubricating properties decrease
Solution Approach 1:
The patent creates a composite lubrication system by combining trifluoroethylene with specific refrigerant oils (ester, ether, or polyglycol oils). This composite allows the system to maintain excellent cycle performance from the HFO-1123 while the refrigerant oil component provides adequate lubricating properties for system components.
Solution Approach 2:
The patent modifies the lubrication parameters by selecting refrigerant oils with specific viscosity characteristics and chemical compositions that are compatible with HFO-1123. By changing the lubrication parameters through careful selection of refrigerant oil types and concentrations, the system achieves both excellent cycle performance and sufficient lubricating properties.
3Reliability
If saturated hydrofluorocarbons are used instead of HFO-1123, then stability and lubricating properties improve, but global warming potential increases
Solution Approach 1:
The patent employs a composite working fluid system that combines the benefits of both saturated HFCs and HFO-1123. The HFO-1123 provides low GWP and excellent cycle performance, while the addition of specific refrigerant oils and auxiliary components compensates for the reduced stability and lubricating properties, achieving a balance that outperforms conventional saturated HFCs in both environmental and operational aspects.
Data Source
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AI summary
To provide a composition for a heat cycle system having favorable lubricating properties and comprising a working fluid for heat cycle which has a low global warming potential and which can replace R410A and a heat cycle system employing the composition. A composition for a heat cycle system comprising a working fluid for heat cycle containing trifluoroethylene, and a refrigerant oil (for example, an ester refrigerant oil, an ether refrigerant oil, a polyglycol refrigerant oil or a hydrocarbon refrigerant oil), and a heat cycle system employing the composition for a heat cycle system.