Working Fluid Composition for Low-GWP Heat Cycle Systems
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Solution Overview
Problem
Current working fluids for heat cycles, such as R410A, have high global warming potential and ozone layer influence, and existing alternatives like HFOs are insufficient in refrigerating capacity and have combustibility issues, while also presenting challenges with temperature glide and discharge temperature.
Innovation Solution
A working fluid composition comprising HFO-1123 and HFO-1132, with optional inclusion of HFC-32 and HFC-125, forming a pseudoazeotropic mixture to achieve low discharge temperature, small temperature glide, and high cycle performance, thereby reducing global warming impact and improving energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFOs (hydrofluoroolefins) are used as working fluid, then ozone layer protection is improved, but refrigerating capacity is insufficient and combustibility increases
Solution Approach 1:
The patent uses composite working fluid composition by mixing HFO-1123 with HFO-1132 and HFC components. This composite approach combines the ozone-friendly properties of HFOs with the refrigerating capacity of HFCs, achieving both environmental protection and adequate cooling performance.
Solution Approach 2:
The patent optimizes the compositional parameters of the working fluid mixture, specifically controlling the ratios of HFO-1123, HFO-1132, and HFC components to achieve the desired balance between refrigerating capacity, flame retardancy, and environmental properties.
2Object-affected harmful factors
If HFO-1123 is used to achieve low global warming potential, then combustibility increases and cycle performance becomes insufficient
Solution Approach 1:
The patent introduces HFO-1132 as an intermediary component that modifies the properties of HFO-1123. This intermediary substance helps suppress combustibility while maintaining low GWP, and also improves overall cycle performance by adjusting the thermal characteristics of the working fluid mixture.
Solution Approach 2:
The composite working fluid combines HFO-1123 (low GWP) with HFO-1132 (flame retardant) and HFC components (performance enhancement), creating a synergistic mixture that achieves low global warming potential while suppressing combustibility and improving cycle performance.
3Productivity
If working fluid composition is optimized for refrigerating capacity, then discharge temperature increases and temperature glide increases
Solution Approach 1:
The patent carefully adjusts the compositional parameters of the working fluid to optimize the balance between refrigerating capacity and discharge temperature. By controlling the ratios of different HFO and HFC components, the patent achieves adequate cooling performance while limiting discharge temperature rise.
Solution Approach 2:
The patent applies local quality optimization by selecting specific HFO and HFC components with complementary properties. Each component contributes specific characteristics: HFO-1123 for low GWP, HFO-1132 for flame retardancy and temperature control, and HFCs for refrigerating capacity enhancement, creating a locally optimized mixture for each performance requirement.
4Productivity
If working fluid composition is optimized for refrigerating capacity, then temperature glide increases reducing energy efficiency
Solution Approach 1:
The patent optimizes compositional parameters to minimize temperature glide while maintaining refrigerating capacity. By adjusting the ratio of HFO-1123, HFO-1132, and HFC components, the patent achieves a near-azeotropic or low-temperature-glide mixture that improves energy efficiency in heat exchange processes.
Solution Approach 2:
The patent creates a homogeneous working fluid mixture with carefully controlled composition ratios. This homogeneity ensures consistent thermal properties throughout the mixture, minimizing temperature glide during phase changes and improving overall energy efficiency of the refrigeration cycle.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed working fluid achieves a low global warming potential, high refrigerating capacity, and efficient energy use with a small temperature glide and low discharge temperature, enhancing the durability and energy efficiency of heat cycle systems.
Implementation Method 1
forming a pseudoazeotropic mixture to achieve low discharge temperature, small temperature glide, and high cycle performance
Implementation Method 2
the carbon-carbon double bond is likely to be decomposed by OH radicals in the air
Implementation Method 3
a working fluid for a latent heat transport apparatus (such as a heat pipe)
Data Source
Figure 1~2
AI summary
To provide a working fluid for heat cycle, which has less influence over global warming, which has a small temperature glide, which has a sufficiently low discharge temperature and which is excellent in the cycle performance (refrigerating capacity and coefficient of performance), a composition for a heat cycle system, and a heat cycle system. A working fluid for heat cycle, which contains trifluoroethylene and 1,2-difluoroethylene, a composition for a heat cycle system, and a heat cycle system employing the composition. In the working fluid for heat cycle, the proportion of the total amount of trifluoroethylene and 1,2-difluoroethylene is preferably at least 20 mass% and at most 100 mass%.