Low-GWP Refrigerant Composition for Low-Temperature Systems
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Solution Overview
Problem
Existing refrigerants for low-temperature refrigeration systems, such as R-23 and R-508, have high Global Warming Potential (GWP) and flammability issues, while alternatives like R-744 and R-744/R-32 mixtures require equipment redesign due to high temperature glide and compressor discharge temperature, making them unsuitable for large-scale applications.
Innovation Solution
A refrigerant composition comprising at least 35% CO2 (R-744), 28-55% 1,1-difluoroethylene (R-1132a), and 1-40% difluoromethane (R-32), optionally with additional components, offering low flammability, low GWP, and compatible operating characteristics with existing equipment, preventing dry ice formation below -70°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional materials like polyethylene or polypropylene are used for orthopedic implants, then the implants can be manufactured with existing processes, but the materials do not bond to bone and require additional fixation methods
Solution Approach 1:
The patent applies composite materials by combining polyolefin base material with surface treatments (plasma coating, chemical etching, or biological coatings) to create a material system that maintains the bulk mechanical properties of conventional polymers while adding bone-bonding capability to the surface, thus resolving the contradiction between ease of manufacture and bone bonding capability
2Strength
If metal alloys like stainless steel or cobalt-chromium are used for orthopedic implants, then the materials provide strength and wear resistance, but they do not bond to bone and may cause allergic reactions
Solution Approach 1:
The patent uses composite materials by creating a layered structure where the bulk material provides mechanical strength and the surface layer (through plasma treatment, chemical etching, or biological coating) provides bone bonding capability and biocompatibility, eliminating allergic reactions while maintaining strength
Solution Approach 2:
The patent applies local quality by treating only the surface of the implant with plasma coating, chemical etching, or biological coatings to provide bone-bonding properties, while the bulk material retains its mechanical strength and wear resistance, thus resolving the contradiction between strength and harmful factors
3Reliability
If ceramic materials are used for orthopedic implants, then the materials are biocompatible and bond to bone, but they are brittle and difficult to manufacture
Solution Approach 1:
The patent applies composite materials by combining ceramic surface coatings (providing biocompatibility and bone bonding) with polyolefin or metal bulk materials (providing toughness and flexibility), thus achieving both bone bonding capability and resistance to brittleness
4Reliability
If additional fixation methods like screws or cement are used with conventional implant materials, then the implants can be secured to bone, but the procedures become more complex and time-consuming
Solution Approach 1:
The patent merges the implant material with bone-bonding surface treatments (plasma coating, chemical etching, or biological coatings) into a single integrated component, eliminating the need for separate fixation methods like screws or cement, thus reducing procedure complexity while maintaining fixation capability
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 composition achieves low flammability, low GWP, and refrigeration performance similar to R-23, with reduced temperature glide and compressor discharge temperatures, suitable for large-scale low-temperature applications without equipment redesign.
Implementation Method 1
The implant is made of a polyolefin that has been plasma treated
Implementation Method 2
The implant comprises a porous structure
Data Source
Figure 1
AI summary
According to the present invention, there is provided a composition carbon dioxide (CO2, R- 744), difluoromethane (R-32) and 1,1-difluoroethylene (R-1132a).