R-410A Replacement Refrigerant Blend With Low GWP and Low Glide
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Solution Overview
Problem
The refrigeration industry faces challenges in finding replacement refrigerants for R-410A with low global warming potential (GWP) and ozone depletion potential, while maintaining performance and environmental sustainability, as existing alternatives either have high GWP or compromised cooling capacity and temperature glide.
Innovation Solution
Compositions comprising difluoromethane, 2,3,3,3-tetrafluoropropene, and carbon dioxide are developed, offering a refrigerant mixture with a GWP of 250 or less, matching the cooling capacity of R-410A, and providing an environmentally sustainable alternative with improved energy efficiency and reduced temperature glide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFC refrigerants (R-32, R-410A) are used to replace CFCs and HCFCs, then ozone depletion potential is eliminated, but global warming potential increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters by introducing HFO-1234yf (tetrafluoropropene) with specific molecular structure and properties, combining it with HFC-32 and CO2 in optimized ratios to achieve both low GWP and acceptable performance
Solution Approach 2:
The patent creates a composite refrigerant mixture combining three different substances (HFC-32, HFO-1234yf, and CO2) with complementary properties to achieve a balance between cooling capacity, temperature glide control, and environmental sustainability that none of the individual components could achieve alone
2Object-generated harmful factors
If replacement refrigerants with lower GWP are sought, then environmental sustainability improves, but cooling capacity and temperature glide performance deteriorate
Solution Approach 1:
The patent optimizes the concentration ratios of components (e.g., HFC-32 at 25-38%, HFO-1234yf at 55-65%, CO2 at 3-10%) to achieve the desired balance between environmental performance and cooling capacity
Solution Approach 2:
The patent exploits the different local properties of each component: HFC-32 provides strong cooling capacity, HFO-1234yf provides low GWP and flammability characteristics, and CO2 provides pressure regulation and temperature glide control, creating a synergistic mixture
3Object-generated harmful factors
If replacement refrigerants with lower GWP are sought, then environmental sustainability improves, but temperature glide increases beyond acceptable ranges
Solution Approach 1:
The patent carefully adjusts the composition parameters to control the temperature glide characteristic, using CO2 as a key component to regulate the phase change temperature behavior of the mixture
Solution Approach 2:
The patent uses CO2 as an intermediary substance that mediates between the high cooling capacity of HFC-32 and the low GWP of HFO-1234yf, while also controlling the temperature glide to remain within acceptable operational ranges
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 proposed refrigerant mixtures demonstrate cooling capacity within 20% of R-410A, average temperature glide of 10° C or less, and improved energy efficiency, while having a significantly lower GWP, making them suitable replacements for R-410A in air conditioning and heat pump systems.
Implementation Method 1
A refrigerant is defined as a heat transfer fluid that undergoes a phase change from liquid to gas and back again during a cycle used to transfer of heat
Implementation Method 2
the term heat transfer fluid (also referred to as heat transfer medium) means a composition used to carry heat from a heat source to a heat sink
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 as refrigerants in processes to produce cooling and heating, in methods for replacing refrigerant R-410A, and in refrigeration, air conditioning or heat pump systems. These inventive compositions match cooling capacity for R-410A within 20% with GWP less than 250 or less than 200.