Binary Refrigerant Composition for Low-GWP Compressor Retrofit
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Solution Overview
Problem
Current refrigeration and air-conditioning systems face challenges with substances having high Global Warming Potential (GWP) and ozone depletion potential, such as HFC-134a and R-404A, which require the development of more environmentally friendly heat transfer fluids that can operate effectively in low-temperature and medium-temperature refrigeration without necessitating new compressor designs.
Innovation Solution
Binary compositions of 2,3,3-tetrafluoropropene and difluoromethane are used as heat transfer fluids in compression systems, particularly in countercurrent or crossed-current modes, offering zero ODP and low GWP, with a preferred weight percentage range of 61-85% 2,3,3-tetrafluoropropene and 15-39% difluoromethane, and can be stabilized with minimal additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFC-134a is used as refrigerant, then ozone depletion is reduced, but global warming potential increases
Solution Approach 1:
The patent changes the chemical composition parameters by using HFO-1234yf instead of HFC-134a, and specifically formulates binary compositions with difluoromethane in ranges of 5-50 wt% HFO-1234yf and 50-95 wt% difluoromethane. This parameter change achieves both low GWP (less than 150) and zero ODP, resolving the contradiction between reducing ozone depletion and minimizing global warming potential.
2Object-generated harmful factors
If carbon dioxide is used as refrigerant, then global warming potential is reduced, but operating pressure increases
Solution Approach 1:
The patent changes the refrigerant composition parameters by formulating binary compositions of HFO-1234yf and difluoromethane, which achieve low GWP (less than 150) while maintaining operating pressures compatible with existing equipment. This resolves the contradiction by finding a middle ground between CO2's low GWP and its high pressure requirements.
3Productivity
If R-404A is used as refrigerant, then refrigeration performance is maintained, but global warming potential increases
Solution Approach 1:
The patent changes the refrigerant composition by replacing R-404A with binary compositions containing HFO-1234yf and difluoromethane. The specific formulation ranges (5-50 wt% HFO-1234yf, 50-95 wt% difluoromethane) are optimized to maintain refrigeration performance while achieving GWP less than 150, thus resolving the contradiction between productivity and environmental impact.
4Device complexity
If existing compressors are used with new refrigerants, then device complexity is reduced, but refrigeration efficiency may deteriorate
Solution Approach 1:
The patent optimizes the composition parameters of HFO-1234yf and difluoromethane to ensure compatibility with existing compressor designs. By carefully selecting the weight percentage ranges (5-50 wt% HFO-1234yf, 50-95 wt% difluoromethane), the invention maintains refrigeration efficiency comparable to or better than existing systems while avoiding the need for new compressor development.
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
These binary compositions provide a higher coefficient of performance (COP) compared to existing systems, allowing for the replacement of R-404A and R-407C without needing new compressors, and can be used in refrigerated vehicles, food storage, and industrial applications, maintaining efficiency and reducing environmental impact.
Implementation Method 1
A heat exchanger is a device for transferring thermal energy from one fluid to another, without mixing them. The thermal flux passes through the exchange surface that separates the fluids.
Implementation Method 2
In compression systems, heat exchange between the refrigerant and the heat sources takes place via heat-transfer fluids. These heat-transfer fluids are in the gaseous state (the air in air conditioning and direct-expansion refrigeration), liquid (water in domestic heat pumps, glycol solution) or two-phase.
Data Source
AI summary
The invention relates to binary compositions of 2,3,3,3-tetrafluoropropene and difluoromethane, as a heat transfer fluid in compression, low-temperature and average temperature refrigeration systems, with exchangers operating in counterflow mode or in split flow mode with counterflow tendency. The invention also relates to a heat transfer method.