HFO-1123 Working Fluid Composition for Low-GWP Heat Cycle Systems
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Solution Overview
Problem
Current heat cycle systems using R410A as a working fluid have high global warming potential (GWP) and there is a need for an alternative with balanced performance, efficiency, and temperature glide that can replace R410A without requiring significant modifications to existing apparatus.
Innovation Solution
A composition for a heat cycle system utilizing a working fluid containing HFO-1123, which has a GWP of less than 675, combined with HFC-32 and/or HFO-1234ze, to achieve a relative coefficient of performance (COP) between 0.85 and 1.20, relative refrigerating capacity between 0.70 and 1.50, and a temperature glide of at most 8°C, while maintaining low GWP and improved cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HFC-32 and HFC-125 are used as working fluid (R410A), then high refrigerating capacity is achieved, but global warming potential becomes excessively high (GWP=2088)
Solution Approach 1:
The patent changes the chemical composition parameters of the working fluid by replacing HFC-32 and HFC-125 with HFO-1123 and HFO-1234ze in specific proportions. This parameter change reduces the GWP from 2088 to below 150 while maintaining refrigerating capacity through optimized compositional ratios.
Solution Approach 2:
The patent creates a composite working fluid mixture comprising HFO-1123 and HFO-1234ze in specific mass ratios (30:70 to 70:30). This composite approach combines the low-GWP properties of HFO-1123 with the complementary thermodynamic properties of HFO-1234ze to achieve both low environmental impact and high refrigerating capacity.
2Object-affected harmful factors
If working fluid composition is changed to reduce GWP, then global warming potential is reduced, but cycle performance and efficiency may deteriorate
Solution Approach 1:
The patent optimizes the compositional parameters of HFO-1123 and HFO-1234ze within specific mass ratio ranges (30:70 to 70:30) to simultaneously achieve low GWP and high cycle performance. This parameter optimization ensures that the working fluid maintains appropriate thermodynamic properties for efficient heat cycle operation.
Solution Approach 2:
The patent assigns specific functional roles to each component: HFO-1123 primarily provides low GWP and refrigerating capacity, while HFO-1234ze contributes to cycle stability and efficiency. This localized functional assignment within the composite mixture allows each component to optimize its contribution to overall system performance.
3Object-affected harmful factors
If working fluid is replaced with alternative composition, then GWP is reduced, but temperature glide and efficiency balance becomes difficult to control
Solution Approach 1:
The patent controls the temperature glide parameter by adjusting the mass ratio of HFO-1123 to HFO-1234ze within specific ranges. This parameter control ensures that the temperature glide remains within acceptable limits for existing heat cycle system equipment, simplifying the transition to the new working fluid.
Data Source
AI summary
To provide a composition for a heat cycle system which comprises a working fluid containing HFO-1123 and having cycle performance sufficient as an alternative to R410A while the influence over global warming is suppressed, 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 having a global warming potential (100 years) in Intergovernmental Panel on Climate Change (IPCC), Fourth assessment report, of less than 675, and a heat cycle system employing the composition for a heat cycle system.