Binary Refrigerant Blend for Low-GWP Counterflow Heat Transfer
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Solution Overview
Problem
Current refrigerants, such as HFC-134a and R-404A, have high Global Warming Potential (GWP) and pressure issues, while alternatives like carbon dioxide face implementation challenges, necessitating the development of low GWP and ozone-depleting potential (ODP) heat transfer fluids for efficient refrigeration and air conditioning systems.
Innovation Solution
Binary compositions of 2,3,3-tetrafluoropropene and difluoromethane are used as heat transfer fluids in compression refrigeration systems, particularly in counter-current and cross-current modes, offering zero ODP and low GWP, with azeotropic ratios of 70-90% 2,3,3-tetrafluoropropene and 10-30% difluoromethane, suitable for high-temperature applications and existing compressor compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFC-134a is used as refrigerant to replace CFC-12, then ozone layer protection is improved, but global warming potential increases
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 zero ODP simultaneously, thus resolving the contradiction between ozone protection and climate protection
Solution Approach 2:
The patent creates a composite refrigerant system by combining two different hydrofluorocarbon compounds (HFO-1234yf and HFC-32) in specific proportions, where the synergistic effect of the mixture achieves properties that neither component alone could provide, specifically low GWP and zero ODP
2Object-generated harmful factors
If carbon dioxide is used as refrigerant to achieve low GWP, then global warming potential is reduced, but operating pressure increases
Solution Approach 1:
The patent introduces HFO-1234yf/HFC-32 binary mixture as an intermediary refrigerant that bridges the gap between CO2's low GWP advantage and conventional refrigerants' moderate pressure requirements, achieving low GWP without the extremely high operating pressures of CO2 systems
3Temperature
If R-404A is used as refrigerant for high-temperature applications, then temperature range is improved, but global warming potential increases
Solution Approach 1:
The patent modifies the refrigerant composition parameters by selecting HFO-1234yf and HFC-32 with appropriate weight ratios, achieving a GWP of less than 150 while maintaining the capability to reach heating temperatures of 95°C, thus resolving the contradiction between temperature performance and environmental impact
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 provide a higher coefficient of performance (COP) than current refrigerants, are stable, and can replace R-404A and R-407C, with existing compressors, while maintaining efficiency and reducing energy consumption in various air conditioning and refrigeration applications.
Implementation Method 1
a heat exchanger is a device that transfers thermal energy from one fluid to another without mixing them. The heat flows through the exchange surface that separates the fluids.
Implementation Method 2
The two fluids are arranged parallel but flow in opposite directions: counter-current (counter-current) flow
Implementation Method 3
a compressor, condenser, expansion valve, and evaporator, and a device inside the closed loop for measuring the system's internal pressure
Implementation Method 4
a compressor, condenser, expansion valve, and evaporator, and a device inside the closed loop
Implementation Method 5
a compressor, condenser, expansion valve, and evaporator
Data Source
AI summary
The invention relates to 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. The invention also relates to a heat transfer method.