Refrigerant Mixture Composition to Prevent HFO-1123 Self-Decomposition
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Solution Overview
Problem
Refrigeration cycle apparatuses using HFO-1123 as a refrigerant face self-decomposition issues under high temperature and pressure, leading to performance and quality problems, especially when the content ratio of HFO-1123 is set to 60% or greater as per existing technologies.
Innovation Solution
A refrigeration cycle apparatus employing a refrigerant mixture with R32 greater than HFO-1123 in mass percentage to prevent self-decomposition, ensuring stable operation and maintaining performance and quality without altering the refrigerant composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFO-1123 is used as a refrigerant with content ratio of 60% or greater, then global warming potential is reduced, but self-decomposition occurs under high temperature and pressure
Solution Approach 1:
R32 is introduced as an intermediary substance that mediates between HFO-1123 molecules, preventing their self-decomposition under high temperature and pressure conditions while allowing HFO-1123 to maintain its low GWP benefits
Solution Approach 2:
The refrigerant composition parameters are changed by limiting HFO-1123 content to 60 mass% or less and R32 content to 40 mass% or more, optimizing the balance between low GWP and prevention of self-decomposition
2Object-affected harmful factors
If HFO-1123 content ratio is increased to 60% or greater, then low-GWP property is achieved, but performance and quality problems arise due to self-decomposition
Solution Approach 1:
The refrigerant composition parameters are optimized by setting HFO-1123 content to 60 mass% or less and R32 content to 40 mass% or more, achieving the optimal balance between low GWP and system performance/quality
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 mixture of R32 and HFO-1123 suppresses self-decomposition, allowing the refrigeration cycle apparatus to operate effectively under high-temperature and high-pressure conditions, maintaining performance and quality while reducing the global warming potential.
Implementation Method 1
there is a possibility that HFO-1123, which is the low-GWP refrigerant, may cause self-decomposition
Implementation Method 2
a compressor configured to compress a refrigerant sucked into the compressor and discharge the refrigerant
Implementation Method 3
a condenser configured to allow the refrigerant to reject heat and condense the refrigerant
Implementation Method 4
allow the refrigerant to reject heat and condense the refrigerant
Implementation Method 5
a pressure reducing device configured to reduce a pressure of the condensed refrigerant
Implementation Method 6
an evaporator configured to allow the refrigerant to remove heat and evaporate the refrigerant
Implementation Method 7
allow the refrigerant to remove heat and evaporate the refrigerant
Data Source
AI summary
A refrigeration cycle apparatus according to the present invention includes a refrigerant circuit formed by connecting, by pipes, a compressor configured to compress a refrigerant sucked into the compressor and discharge the refrigerant, a condenser configured to cause the refrigerant to reject heat and condense the refrigerant, an electronic expansion valve configured to reduce a pressure of the condensed refrigerant, and an evaporator configured to cause the refrigerant to remove heat and evaporate the refrigerant, in which the refrigerant is a refrigerant mixture including R32 and HFO-1123, and in the refrigerant mixture, R32 is greater than HFO-1123 in mass %.