Mixed Refrigerant Composition for Low GWP and High-Temperature Stability

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Solution Overview

Problem

Current refrigerants face challenges in replacing R410A while minimizing Global Warming Potential (GWP), avoiding disproportionation reactions, and maintaining refrigerating capacity, especially at high pressures and temperatures.

Innovation Solution

A refrigerant composition comprising 1,1-difluoroethane (R152a) and trans-1,2-difluoroethylene (HFO-1132) or difluoromethane (R32) in a total amount of 99.5 mass % or more, optimized to prevent disproportionation reactions and achieve a GWP of 400 or less, with a refrigerating capacity ratio of 50% or more relative to R410A, by controlling the mass percentages within specific ternary composition diagram ranges.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If HFO-1132(E) is used as a refrigerant component, then GWP is reduced, but disproportionation reactions occur at high temperatures and pressures

Engineering Contradiction:

ImproveGWPVSAvoidchemical stability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

R152a acts as an intermediary substance that suppresses the disproportionation reaction of HFO-1132(E). The patent specifies a composition where R152a is present at 6-54 mass% and HFO-1132(E) is present at 46-94 mass%, creating a system where R152a mediates the chemical stability while maintaining the low GWP benefits of HFO-1132(E).

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the compositional parameters by defining specific mass% ranges for R152a and HFO-1132(E) based on their boiling point relationship. This parameter optimization ensures that the mixture maintains chemical stability across the operating temperature and pressure range while achieving low GWP.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If R410A is replaced with alternative refrigerants, then GWP is reduced, but refrigerating capacity is compromised

Engineering Contradiction:

ImproveGWPVSAvoidrefrigerating capacity

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent creates a composite refrigerant mixture combining R152a and HFO-1132(E) in specific proportions. This composite approach leverages the complementary properties of both components: HFO-1132(E) provides low GWP while R152a enhances refrigerating capacity and chemical stability, achieving a balance that single-component alternatives cannot provide.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes the local composition quality by specifying that the refrigerant should contain R152a at 6-54 mass% and HFO-1132(E) at 46-94 mass%. This localized compositional control ensures that the refrigerant maintains appropriate refrigerating capacity in the evaporator while achieving low GWP overall.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20240287368A1Composition containing refrigerant, use of same, refrigerator having same, and method for operating said refrigerator

Publication Date: 2024.08.29 DAIKIN INDUSTRIES LTD

AI summary

An object is to provide a novel low-GWP mixed refrigerant. Provided as a means for solution is a composition comprising a refrigerant, the refrigerant comprising 1,1-difluoroethane (R152a), and difluoromethane (R32) and/or X in a total amount of 99.5 mass % or more based on the entire refrigerant, wherein X is trans-1,2-difluoroethylene (HFO-1132 (E)) and/or trifluoroethylene (HFO-1123).