Mixed Refrigerant Composition for Low-GWP R410A Replacement

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Solution Overview

Problem

Existing refrigerants like R410A have a high global warming potential (GWP) that is a concern due to global warming, and there is a need for low-GWP alternatives that maintain efficiency and refrigerating capacity.

Innovation Solution

A refrigerant composition comprising 1,1-difluoroethylene (HFO-1132a) and difluoromethane (R32) in specific mass percentages, which can be used as a drop-in alternative for R410A, maintaining a COP ratio of 90% or more and refrigerating capacity ratio of 115% or more while reducing GWP to 500 or less.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If R410A is used as refrigerant, then refrigerating capacity and COP are maintained, but global warming potential increases

Engineering Contradiction:

Improveglobal warming potentialVSAvoidrefrigerating capacity

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters of the refrigerant by using HFO-1132a (1,1-difluoroethylene) instead of conventional refrigerants like R410A or R32. This parameter change in molecular structure fundamentally reduces the global warming potential while maintaining the refrigerating capacity and COP through optimized composition ratios of HFO-1132a and R125

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite refrigerant mixture combining HFO-1132a and R125 in specific proportions (HFO-1132a: 40-70 mass%, R125: 30-60 mass%). This composite approach leverages the low GWP of HFO-1132a while using R125 to ensure adequate refrigerating capacity and system compatibility, resolving the contradiction between environmental harm and performance reliability

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If R32 is used to reduce GWP, then global warming potential decreases, but refrigerating capacity and COP may be insufficient

Engineering Contradiction:

Improveglobal warming potentialVSAvoidcoefficient of performance

Core Design Contradiction:

Object-affected harmful factorsVSPower

Solution Approach 1:

The patent optimizes the composition parameters by incorporating HFO-1132a with specific mass percentage (40-70%) alongside R125, adjusting the physical and chemical parameters of the refrigerant mixture to achieve both low GWP and high COP, overcoming the limitations of pure R32

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent develops a composite refrigerant system combining HFO-1132a and R125 where HFO-1132a provides low environmental impact and R125 contributes to efficient heat transfer and system performance, achieving synergistic effects that satisfy both environmental and performance requirements

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS12480029B2Composition containing refrigerant, use of same, refrigerator having same, and method for operating said refrigerator

Publication Date: 2025.11.25 DAIKIN INDUSTRIES LTD

AI summary

Provided is a novel low-GWP mixed refrigerant. A composition comprising a refrigerant, the refrigerant comprising 1,1-difluoroethylene (HFO-1132a) and difluoromethane (R32), wherein HFO-1132a is present in an amount of 26 to 40 mass % based on the total of HFO-1132a and R32, and R32 is present in an amount of 60 to 74 mass % based on the total of HFO-1132a and R32.