Low GWP Heat Transfer Compositions for Refrigeration
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Solution Overview
Problem
Current refrigerants, such as R-404A, have high Global Warming Potential (GWP) and ozone-depleting properties, leading to environmental concerns, and existing alternatives like HFCs are often flammable and inefficient, necessitating a need for non-chlorine-containing, low-GWP refrigerants with excellent heat transfer properties and compatibility with existing vapor compression technology.
Innovation Solution
A composition comprising 21.5% HFC-32, 75.5% 2,3,3,3-tetrafluoropropene, and 3% CO2, which serves as a replacement for R-404A in refrigeration systems, offering improved capacity, efficiency, and reduced GWP while maintaining compatibility with existing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chlorine-containing refrigerants (CFCs, HCFCs) are used, then excellent heat transfer properties and system compatibility are achieved, but ozone depletion occurs
Solution Approach 1:
The patent changes the chemical composition parameters by replacing chlorine-containing compounds with hydrofluorocarbon compounds, specifically using HFC-134a, HFC-125, and HFC-143a in defined proportions. This substitution eliminates the harmful chlorine element while maintaining the refrigerant's heat transfer properties and system compatibility.
2Object-affected harmful factors
If existing HFC alternatives are used, then ozone depletion is avoided, but flammability and inefficiency problems arise
Solution Approach 1:
The patent creates a composite refrigerant composition by combining multiple hydrofluorocarbon compounds (HFC-134a, HFC-125, HFC-143a) in specific proportions. This composite approach leverages the complementary properties of each component to achieve non-flammability, high efficiency, and environmental safety that individual HFC alternatives cannot provide alone.
3Power
If high GWP refrigerants like R-404A are used, then adequate cooling capacity is achieved, but global warming potential increases
Solution Approach 1:
The patent changes the thermodynamic and environmental parameters by substituting high-GWP R-404A with a low-GWP HFC mixture. The new composition achieves comparable cooling capacity through optimized component ratios while reducing GWP from 3943 to below 150, eliminating the need for system redesign.
4Object-affected harmful factors
If refrigerant substitution is performed, then environmental performance is improved, but compatibility with existing vapor compression technology must be maintained
Solution Approach 1:
The patent maintains homogeneity in the refrigerant properties by using hydrofluorocarbon compounds that share similar thermodynamic characteristics, lubricant compatibility, and system material compatibility with conventional refrigerants. This ensures seamless integration with existing vapor compression technology while achieving environmental goals.
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 composition demonstrates enhanced performance in low and medium temperature refrigeration systems, achieving lower GWP, improved energy consumption, and matching or exceeding the capacity and efficiency of R-404A, while being non-flammable and environmentally friendly.
Implementation Method 1
systems based on the vapor compression cycle usually involve the phase change of the refrigerant from the liquid to the vapor phase through heat absorption at a relatively low pressure
Implementation Method 2
heat transfer compositions
Implementation Method 3
the phase change of the refrigerant from the liquid to the vapor phase through heat absorption
Data Source
Figure 1
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AI summary
The present invention relates, in part, to heat transfer compositions, methods, and uses thereof that include (a) from about 17% to about 40% by weight of HFC-32; (b) from about 51% to about 83% by weight of a tetrafluoropropene; and (c) from greater than about 0% to less than about 9% by weight of CO2. The amount of component (c) improves one or more of a capacity, efficiency, discharge temperature, discharge pressure, and/or energy consumption of the composition, particularly in a low or medium temperature refrigeration system and as compared to composition lacking component (c) and/or the refrigerant R-404A.