Binary Refrigerant Blend for Low-GWP Counterflow Compression Cooling
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Solution Overview
Problem
Current refrigerants, such as HFC-134a and R-404A, have high Global Warming Potential (GWP) and operational challenges, including high pressure requirements, which are not environmentally friendly and inefficient in compression-type refrigeration systems.
Innovation Solution
Binary compositions of 2,3,3-tetrafluoropropene and difluoromethane are used as heat transfer fluids in compression-type refrigeration systems, particularly in countercurrent or crossed-current modes, offering zero Ozone Depletion Potential (ODP) and low GWP, with a high critical temperature suitable for extreme conditions, and can be stabilized with minimal additional components.
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 significantly
Solution Approach 1:
The patent changes the chemical composition parameters by using a binary mixture of HFO-1234yf and HFC-32 with specific weight ratios (30-70% HFO-1234yf and 70-30% HFC-32), achieving both low GWP and acceptable refrigeration performance, thus resolving the contradiction between reducing ozone depletion and minimizing global warming impact
Solution Approach 2:
The patent creates a composite refrigerant system by combining two different chemical compounds (HFO-1234yf and HFC-32) in specific proportions, leveraging the low GWP of HFO-1234yf and the favorable thermodynamic properties of HFC-32 to achieve a balanced solution that addresses both environmental concerns
2Object-generated harmful factors
If carbon dioxide is used as refrigerant, then global warming potential is reduced, but operating pressure increases significantly
Solution Approach 1:
The patent changes the pressure parameter by selecting a refrigerant mixture with appropriate saturation pressure characteristics for standard operating conditions, avoiding the excessively high pressures of CO2 while maintaining low GWP through the use of HFO-1234yf/HFC-32 combination
3Productivity
If R-404A is used as refrigerant, then refrigeration capacity is maintained, but global warming potential increases significantly
Solution Approach 1:
The patent changes the chemical composition to achieve a favorable balance between refrigeration capacity and environmental impact by optimizing the ratio of HFO-1234yf to HFC-32, maintaining adequate cooling performance while achieving GWP well below that of R-404A
Solution Approach 2:
The patent employs a composite approach by combining HFO-1234yf (low GWP) with HFC-32 (good thermodynamic properties) in specific proportions, creating a mixture that balances refrigeration capacity requirements with environmental sustainability
4Device complexity
If existing compressors are used with new refrigerant, then device complexity is reduced, but coefficient of performance may be affected
Solution Approach 1:
The patent optimizes the thermodynamic parameters of the refrigerant mixture (saturation pressure, latent heat, specific heat) to match the operating characteristics of existing compressors, ensuring efficient energy conversion and maintaining high COP without requiring complex system modifications
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 enhance the coefficient of performance (COP) in refrigeration systems, allowing existing compressors to be used and reducing energy consumption, while being environmentally friendly and suitable for high-temperature applications.
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
Binary compositions of 2,3,3,3-tetrafluoropropene and difluoromethane, and especially to the uses thereof as a heat transfer fluid in compression systems with exchangers operating in counterflow mode or in split flow mode with counterflow tendency. Also, a method of heat transfer in which a binary composition of 2,3,3,3-tetrafluoropropene and difluoromethane is used as refrigerant in compression systems with exchangers in countercurrent mode or in crossed-current mode with countercurrent tendency.