Low-GWP Heat Transfer Fluid Composition for Refrigeration Performance
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Solution Overview
Problem
Current refrigerant and heat transfer fluids, such as HFC-134a, R-404A, and R-407C, have high global warming potential (GWP) and ozone depletion potential (ODP), necessitating the development of alternatives that are environmentally friendly and efficient.
Innovation Solution
Compositions comprising 60% to 90% by weight of 2,3,3-tetrafluoropropene combined with 10% to 40% by weight of difluoroethane and difluoromethane, which offer zero ODP and a lower GWP, suitable for use as heat transfer fluids, refrigerants, blowing agents, aerosols, and solvents, potentially replacing existing fluids like R-404A and R-407C in refrigeration and air conditioning systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFC-134a is used as refrigerant fluid, then ozone depletion is reduced, but global warming potential increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters by using hydrofluoropropenes (specifically 1,3,3,3-tetrafluoropropene and 2,3,3,3-tetrafluoropropene) instead of conventional HFCs. These compounds have fundamentally different molecular structures that result in zero ozone depletion potential and reduced global warming potential while maintaining refrigerant performance characteristics.
Solution Approach 2:
The patent creates composite refrigerant compositions by combining hydrofluoropropenes with other fluorinated compounds in specific ratios. These composite mixtures (such as those containing HFC-134a, HFC-125, HFC-143a, or HFC-135a) achieve optimized environmental properties while maintaining thermodynamic performance for heat transfer applications.
2Productivity
If R-404A mixture is used as refrigerant fluid, then refrigeration performance is improved, but global warming potential increases to 3900
Solution Approach 1:
The patent modifies the compositional parameters by replacing conventional high-GWP components with hydrofluoropropenes. The specific formulations (such as Composition A with 60-80% 1,3,3,3-tetrafluoropropene and 20-40% HFC-134a) are designed to maintain the refrigeration performance required for superstores and refrigerated transport while achieving significantly lower GWP values.
3Productivity
If R-407C mixture is used as heat transfer fluid, then air conditioning performance is improved, but global warming potential increases to 1800
Solution Approach 1:
The patent changes the chemical composition by incorporating hydrofluoropropenes (particularly 2,3,3,3-tetrafluoropropene) in combination with other fluorinated compounds. The formulations are specifically optimized for air conditioning and heat pump applications, maintaining the required thermal performance while reducing GWP compared to conventional R-407C mixture.
4Object-generated harmful factors
If carbon dioxide is used as refrigerant fluid, then global warming potential is reduced, but operating pressure increases very high
Solution Approach 1:
The patent uses hydrofluoropropenes as intermediary substances that bridge the gap between carbon dioxide's environmental benefits and conventional refrigerants' pressure characteristics. These compounds provide intermediate operating pressures that are lower than CO2 while maintaining low GWP, making them suitable for existing refrigeration infrastructure without requiring high-pressure system modifications.
Data Source
AI summary
Compositions which are based on tetrafluoropropene and more particularly relates to compositions including 60% to 90% by weight of 2,3,3,3-tetrafluoropropene and 10% to 40% by weight of at least one compound selected from difluoroethane and difluoromethane, which can be used as a heat transfer fluid. The compositions may include 60% to 79% by weight of 2,3,3,3-tetrafluoropropene and 21% to 40% by weight of a compound selected from difluoroethane and difluoromethane.