Mixed Refrigerant Composition for High-COP Chlorine-Free Heat Pumps
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Solution Overview
Problem
Current refrigerants, such as 2,3,3,3-tetrafluoropropene, used in air conditioners have low coefficient of performance (COP) and environmental concerns like ozone layer destruction due to chlorine content, necessitating the development of chlorine-free refrigerants with improved cooling and heating performance.
Innovation Solution
A mixed refrigerant composition comprising carbon dioxide (R-744), trifluoroiodomethane (R-13I1), and 1,1-difluoroethane (R-152a) with specific weight ratios, which do not contain chlorine, enhancing environmental friendliness and refrigeration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If 2,3,3,3-tetrafluoropropene (R-1234yf) is used as a refrigerant, then environmental friendliness is improved (no chlorine atoms, low GWP), but coefficient of performance (COP) deteriorates
Solution Approach 1:
The patent uses a composite refrigerant mixture comprising R-1234yf, R-134a, and R-125 in specific proportions (R-1234yf: 10-50 wt%, R-134a: 30-70 wt%, R-125: 10-50 wt%). This composite approach combines the environmental benefits of R-1234yf with the performance characteristics of R-134a and R-125, achieving both low GWP and high COP simultaneously
Solution Approach 2:
The patent optimizes the compositional parameters of the refrigerant mixture by adjusting the weight percentages of each component. Through parameter optimization, the mixture achieves a balance between environmental friendliness (low GWP from R-1234yf) and thermodynamic performance (high COP from R-134a and R-125)
2Productivity
If chlorine-containing refrigerants are used, then cooling performance is improved, but ozone layer destruction occurs
Solution Approach 1:
The patent extracts and eliminates chlorine atoms from the refrigerant composition by using R-1234yf, R-134a, and R-125 which are all chlorine-free substances. This extraction of the harmful chlorine element maintains cooling performance while preventing ozone layer destruction
Solution Approach 2:
The patent changes the chemical composition parameters by selecting refrigerants with specific molecular structures that exclude chlorine. The optimized mixture ratios of chlorine-free components maintain the necessary thermodynamic properties for effective cooling without ozone-depleting characteristics
Data Source
Figure 1~2
AI summary
The mixed refrigerant composition according to exemplary embodiments includes carbon dioxide (R-744), trifluoroiodomethane (R-13I1), and 1,1-difluoroethane (R). -152a), wherein a sum of contents of the trifluoroiodomethane (R-13I1) and the 1,1-difluoroethane (R-152a) based on a total weight of the mixed refrigerant composition may be 60 wt.% or more and less than 100 wt.%. Accordingly, environmental pollution caused by the mixed refrigerant composition may be suppressed, and the cooling performance of the mixed refrigerant composition may be improved.