Heat Cycle Fluid Composition With Low Temperature Glide
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Solution Overview
Problem
The use of HFO-1123 and CF3I in heat cycle systems results in high heat cycle performance but increased temperature glide, making it challenging to maintain the temperature glide within a predetermined range, and there is a need for a working fluid that addresses global warming concerns and replaces R410A, R407C, and R404A.
Innovation Solution
A composition for a heat cycle system comprising a working fluid with 1,1,2-trifluoroethylene, CF3I, and at least one hydrofluorocarbon or hydrofluoroolefin, with a temperature glide of no more than 7°C, which includes specific combinations of difluoromethane, pentafluoroethane, 1,1,2-tetrafluoroethane, fluoroethane, 2,3,3,3-tetrafluoropropene, and propane to enhance cycle performance and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HFO-1123 and CF3I are used in combination to achieve high heat cycle performance, then heat cycle performance is improved, but temperature glide increases making it difficult to maintain within predetermined range
Solution Approach 1:
The patent applies parameter changes by precisely controlling the composition ratios of HFO-1123 (5-50 mass%), CF3I (5-40 mass%), and additional HFO or HFC components. By adjusting these parameters within specific ranges, the working fluid achieves both high heat cycle performance and acceptable temperature glide characteristics (within 7°C or less in some embodiments).
Solution Approach 2:
The patent creates a composite working fluid by combining HFO-1123 with CF3I and additional HFO or HFC components. This composite composition leverages the high performance of HFO-1123 while using CF3I and supplementary components to moderate temperature glide, achieving a balanced performance profile that satisfies both productivity and stability requirements.
2Productivity
If R410A is used as working fluid for common air-conditioning apparatus, then refrigerating capacity is improved, but global warming potential becomes too high
Solution Approach 1:
The patent changes the chemical composition parameters by replacing R410A (HFC-32/HFC-125 mixture) with a working fluid based on HFO-1123 combined with CF3I and additional HFO or HFC components. This parameter change reduces global warming potential while maintaining refrigerating capacity through optimized composition ratios.
Solution Approach 2:
The patent employs HFO-1123, which has inherently lower environmental persistence and lower GWP compared to traditional HFCs like those in R410A. Although HFO-1123 requires stabilization with CF3I, the overall environmental impact is reduced, trading some system complexity for lower harmful factors.
3Object-generated harmful factors
If HFO-1123 is used as working fluid, then influence over ozone layer and global warming is reduced, but self-decomposition occurs at high temperature or under high pressure
Solution Approach 1:
The patent introduces CF3I as a stabilizer that acts as an intermediary substance to prevent self-decomposition of HFO-1123 at high temperatures and pressures. CF3I absorbs the harmful effects that would otherwise cause decomposition, protecting the HFO-1123 and maintaining system reliability while preserving the low environmental impact benefits.
Solution Approach 2:
The patent applies beforehand cushioning by pre-addening CF3I stabilizer to the working fluid composition before the system operates under extreme conditions. This stabilizer is present in advance (5-40 mass% of the composition) to cushion against self-decomposition when HFO-1123 is exposed to high temperature or high pressure conditions during normal operation.
Data Source
AI summary
To provide a composition for a hat cycle system which comprises a working fluid containing 1,1,2-trifluoroethylene, having cycle performance sufficient as an alternative to R410A while suppressing influence over global warming, and a heat cycle system employing the composition.A composition for a heat cycle system, which comprises a working fluid for heat cycle containing 1,1,2-trifluoroethylene, CF3I and at least one compound selected from a hydrofluorocarbon, a hydrofluoroolefin other than 1,1,2-trifluoroethylene and a hydrocarbon, and having a temperature glide of at most 7° C., and a heat cycle system employing the composition for a heat cycle system.