Mixed refrigerant composition and heat pump including the same
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Solution Overview
Problem
Current refrigerants, such as 2,3,3,3-tetrafluoropropene, have a low coefficient of performance (COP) leading to decreased air conditioner performance and require additional heat pumps, while also posing environmental concerns due to chlorine content.
Innovation Solution
A mixed refrigerant composition comprising carbon dioxide (R-744), 2,3,3,3-tetrafluoropropene (R-1234yf), and 1,1-difluoroethane (R-152a) is developed, with specific weight ratios and properties to enhance environmental friendliness and cooling performance.
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), but cooling performance deteriorates (low COP requiring additional heat pump)
Solution Approach 1:
The patent applies composite refrigerant composition by mixing R-1234yf with R-744 and R-152a in specific proportions. This composite approach combines the environmental benefits of R-1234yf (zero ODP) with the performance characteristics of R-744 and the thermodynamic properties of R-152a, achieving both environmental friendliness and adequate cooling performance without requiring additional heat pump equipment
Solution Approach 2:
The patent changes the compositional parameters of the refrigerant mixture by optimizing the weight ratios of R-1234yf (65-95%), R-744 (1-10%), and R-152a (1-30%). By adjusting these parameters, the mixture achieves a boiling point range of -65 to -30°C and optimal thermodynamic properties that improve cooling performance while maintaining environmental benefits
2Object-affected harmful factors
If refrigerant composition is changed to improve environmental friendliness, then ozone depletion is reduced, but coefficient of performance decreases
Solution Approach 1:
The patent introduces R-744 (carbon dioxide) and R-152a as intermediary substances that mediate between the environmental requirements and performance requirements. R-744 provides excellent environmental credentials (zero ODP, low GWP) while R-152a contributes favorable thermodynamic properties, together enabling the system to achieve both low environmental impact and acceptable COP
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 mixed refrigerant composition achieves improved cooling performance, reduced environmental impact by eliminating chlorine, and enhanced thermal stability, leading to increased refrigeration capacity and lower power consumption.
Implementation Method 1
Refrigerants are substances used to remove heat from heat pumps
Implementation Method 2
The refrigerants may include, for example, natural refrigerants, chlorofluorocarbon (CFC)-based refrigerants
Data Source
AI summary
A mixed refrigerant composition includes carbon dioxide (R-744), 2,3,3,3-tetrafluoropropene (R-1234yf) and 1,1-difluoroethane (R-152a). A content of the carbon dioxide (R-744) ranges from 1 to 10 wt. % based on a total weight of the mixed refrigerant composition, and a content of the 2,3,3,3-tetrafluoropropene (R-1234yf) ranges from 65 to 95 wt. % based on the total weight of the mixed refrigerant composition, and a content of the 1,1-difluoroethane (R-152a) ranges from 1 to 30 wt. % based on the total weight of the mixed refrigerant composition. A boiling point at 1 atm of the mixed refrigerant composition ranges from −65 to −30° C.