R-32 Replacement Refrigerant Blend With Low GWP and Matched Cooling
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Solution Overview
Problem
The refrigeration industry faces challenges in finding refrigerants with low global warming potential (GWP), low toxicity, and low ozone depletion potential (ODP) that maintain good performance for cooling and heating, as existing alternatives like R-32 have moderate GWP and regulatory constraints are tightening.
Innovation Solution
Compositions comprising difluoromethane, 2,3,3,3-tetrafluoropropene, and carbon dioxide are developed, offering a balance of properties to replace R-32 in air conditioning and heat pump systems, with specific weight percentage ratios that provide cooling capacity within 10% of R-32's performance while reducing GWP to 400 or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If R-32 refrigerant is used to achieve good cooling performance, then cooling capacity is improved, but global warming potential increases
Solution Approach 1:
The patent applies composite refrigerant composition by combining HFC-32, HFO-1234yf, and CO2 in specific proportions to create a blended refrigerant that achieves both good cooling performance and low GWP. The composite formulation leverages the complementary properties of each component: HFC-32 provides strong cooling capacity, HFO-1234yf reduces flammability and GWP, and CO2 further lowers GWP while maintaining system efficiency.
Solution Approach 2:
The patent changes the compositional parameters of the refrigerant mixture by specifying precise weight percentage ranges for each component (HFC-32: 20-40%, HFO-1234yf: 60-80%, CO2: 1-10%). This parameter optimization allows the refrigerant blend to achieve cooling capacity within 10% of R-32 while reducing GWP to 400 or less, directly resolving the contradiction between performance and environmental impact.
2Object-affected harmful factors
If refrigerant composition is changed to reduce GWP, then environmental sustainability is improved, but cooling performance may deteriorate
Solution Approach 1:
The patent optimizes compositional parameters within specific ranges (HFC-32: 20-40%, HFO-1234yf: 60-80%, CO2: 1-10%) to achieve the optimal balance between low GWP and high cooling capacity. The parameter optimization ensures cooling capacity remains within 10% of R-32 performance while achieving GWP ≤400.
Solution Approach 2:
The patent applies local quality by assigning specific functional roles to each component in the blend: HFC-32 primarily provides cooling capacity in the evaporator, HFO-1234yf provides heat transfer efficiency in the condenser and reduces flammability, and CO2 provides additional GWP reduction. This functional differentiation allows each component to contribute its strength while minimizing overall system compromises.
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 compositions offer environmentally sustainable alternatives with reduced GWP, matching or improving the cooling capacity of R-32 while operating efficiently within air conditioning and heat pump systems, and can be used with minimal system modifications.
Implementation Method 1
evaporating a composition comprising difluoromethane, 2,3,3,3-tetrafluoropropene, and carbon dioxide in the vicinity of a body to be cooled
Implementation Method 2
evaporating a composition... in the vicinity of a body to be cooled, and condensing said composition
Implementation Method 3
evaporating a composition comprising difluoromethane, 2,3,3,3-tetrafluoropropene, and carbon dioxide in the vicinity of a body to be cooled, and condensing said composition
Implementation Method 4
evaporating a composition... and condensing said composition in the vicinity of a body to be heated
Data Source
AI summary
In accordance with the present invention refrigerant compositions are disclosed. The compositions comprise a refrigerant mixture consisting essentially of HFC-32, HFO-1234yf, and CO2. The compositions are useful in processes to produce cooling and heating, in methods for replacing refrigerant R-32, and in refrigeration, air conditioning or heat pump systems. These inventive compositions are match cooling performance for R-32 with GWP less than 400 or less than 300.