Low-GWP Refrigerant Mixture for Freezers
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Solution Overview
Problem
There is a need for a novel low-GWP refrigerant that can replace existing refrigerants while maintaining performance and safety standards.
Innovation Solution
A refrigerant composition comprising trans-1,2-difluoroethylene (HFO-1132(E)), 1,1-difluoroethane (R152a), and 2,3,3,3-tetrafluoropropene (HFO-1234yf) or trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)) in specific mass ratios, optimized to achieve low Global Warming Potential (GWP), high occupational exposure limit, and stability against disproportionation reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing refrigerants (R410A, R134a) are used, then refrigerating capacity and COP are maintained, but GWP is high and environmental harm increases
Solution Approach 1:
The patent uses a composite refrigerant mixture comprising HFO-1132(E), R152a, and HFO-1234yf in specific mass ratios (30-70%, 10-50%, 5-20% respectively). This composite composition achieves low GWP (≤89) while maintaining refrigerating capacity ≥50% and COP ≥95% relative to R410A, resolving the contradiction between environmental performance and refrigeration effectiveness
Solution Approach 2:
The patent optimizes the mass ratio parameters of the three refrigerant components to achieve the desired balance. By adjusting the proportions of HFO-1132(E), R152a, and HFO-1234yf within specified ranges, the composition achieves both low GWP and maintained refrigeration performance, demonstrating parameter optimization to resolve the technical contradiction
Data Source
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AI summary
An object of the present disclosure is to provide a novel low-GWP mixed refrigerant. The present disclosure provides a composition containing a refrigerant that contains trans-1,2-difluoroethylene (HFO-1132(E)), 1,1-difluoroethane (R152a), and X in a total amount of 99.5 mass% or more based on the entire refrigerant, wherein X represents 2,3,3,3-tetrafluoropropene (HFO-1234yf) and/or trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)), wherein in a ternary composition diagram in which the percentages by mass of HFO-1132(E), R152a, and X (HFO-1234yf and/or HFO-1234ze(E)) based on their sum in the refrigerant are respectively x, y, and z, the ratio of the concentration of HFO-1234ze(E) to the concentration of (HFO-1234yf and HFO-1234ze(E)) is expressed by r = HFO-1234ze(E)/(HFO-1234yf + HFO-1234ze(E)), and the sum of HFO-1132(E), R152a, and X is 100 mass%, when 0≤r<0.45125, coordinates (x,y,z) fall within a figure surrounded by point A (80.2, 19.8, 0.0), point Br (-10.832r2+33.032r+44.3, 0.0, 10.832r2-33.032r+55.7), point Hr (20.0, 0.0, 80.0), point E'r (20.0, -62.715r+28.3, 62.715r+51.7), and point E (28.3, 71.7, 0.0), or fall on any of line segments ABr, HrE'r, or E'rE but do not fall on point A, point Br, point Hr, or point E, and line segment ABr, line segment BrHr, line segment HrE'r, line segment E'rE, and line segment EA are straight lines; and when 0.45125≤r≤1.0, coordinates (x,y,z) fall within a figure surrounded by point A (80.2, 19.8, 0.0), point Br (-10.832r2+33.032r+44.3, 0.0, 10.832r2-33.032r+55.7), point Fr (5.892r2+9.308r+14.6, 0.0, -5.892r2-9.308r+85.4), and point E (28.3, 71.7, 0.0), or fall on line segment ABr or FrE but do not fall on point A, point Br, point Fr, or point E, and line segment ABr, line segment BrFr, line segment FrE, and line segment EA are straight lines.