Heat transfer fluid
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Solution Overview
Problem
Current refrigeration and heat transfer fluids, such as R-404A and R-407C, have high Global Warming Potentials (GWPs) and ozone depletion potential, necessitating the development of alternatives with zero ODP and lower GWP.
Innovation Solution
Compositions comprising 60 to 90% by weight of 2,3,3 tetrafluoropropene and 10 to 40% by weight of difluoroethane and difluoromethane are used as heat transfer fluids, replacing R-404A in refrigeration systems with cascade compression, and may include stabilizers and lubricants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFC-134a is used as refrigerant to replace CFCs, then ozone depletion potential is reduced, but global warming potential increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters by using hydrofluoropropenes (specifically 2,3,3,3-tetrafluoropropene) instead of conventional HFCs. This chemical parameter change results in a GWP of less than 150 while maintaining zero ODP, thereby resolving the contradiction between reducing ozone depletion and minimizing global warming potential.
Solution Approach 2:
The patent creates composite refrigerant compositions by combining hydrofluoropropenes with other fluorinated compounds in specific ratios. These composite formulations achieve optimized environmental properties with low GWP and zero ODP, while maintaining the required thermodynamic performance for refrigeration systems.
2Productivity
If R-404A mixture is used as refrigeration fluid, then refrigeration performance is improved, but global warming potential increases to 3900
Solution Approach 1:
The patent fundamentally changes the compositional parameters by replacing the HFC-based R-404A mixture with hydrofluoropropene-based compositions. This parameter change achieves GWP reduction from 3900 to less than 150 while maintaining refrigeration performance through careful selection of co-refrigerants and optimization of composition ratios.
Solution Approach 2:
The patent introduces hydrofluoropropenes as intermediary substances that bridge the gap between environmental requirements and performance requirements. These compounds serve as mediators that enable low-GWP refrigeration by combining favorable environmental properties with adequate thermodynamic performance.
3Object-generated harmful factors
If carbon dioxide is used as refrigerant to achieve low GWP, then global warming potential is reduced, but operating pressure becomes very high
Solution Approach 1:
The patent changes the physical-chemical parameters by selecting hydrofluoropropenes with appropriate critical temperatures and pressures. These compounds operate at moderate pressures comparable to conventional refrigerants, unlike carbon dioxide which requires high-pressure operation. This parameter optimization resolves the contradiction between low GWP and manageable operating pressure.
4Object-generated harmful factors
If existing hydrofluoropropenes are used as heat transfer fluids, then GWP is reduced to at most 150, but composition stability and system compatibility may be compromised
Solution Approach 1:
The patent introduces stabilizers and compatibility agents as intermediary substances that protect the hydrofluoropropene composition from degradation and ensure system compatibility. These additives mediate between the reactive hydrofluoropropene molecules and system components, preventing unwanted reactions while maintaining the low-GWP benefit.
Solution Approach 2:
The patent creates stable composite formulations by combining hydrofluoropropenes with carefully selected co-refrigerants and stabilizers. This composite approach enhances composition stability and system compatibility while preserving the low global warming potential, resolving the contradiction between environmental performance and operational reliability.
Data Source
AI summary
The invention relates to compositions containing tetrafluoropropene and more particularly to compositions containing 60 to 90 wt % of 2,3,3,3 tetrafluoropropene and 10 to 40 wt % of at least one compound selected from difluoroethane and difluoromethane, and which can be used as a heat transfer fluid.