R22 Replacement Refrigerant Composition for Direct System Retrofit
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Solution Overview
Problem
Existing refrigerants like R22 are being phased out due to ozone depletion and greenhouse gas concerns, but alternatives such as R32, R125, and blends like R410A are incompatible with R22 systems or have low efficiency, leading to high replacement costs and resource waste.
Innovation Solution
A refrigerant composition of 1,1,1-trifluoroethane, difluoromethane, pentafluoroethane, 1,1,1,2-tetrafluoroethane, and n-butane, mixed in specific weight percentages, which is physically compatible with R22 systems and can be directly charged, offering low-cost, efficient refrigeration with zero ozone depletion potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing single component refrigerants (R32, R125, R134a) or commonly-used blended refrigerants (R410A, R407C, R404A) are used to replace R22, then environmental protection requirements are met, but they are incompatible with the working pressure and lubricant of R22 systems
Solution Approach 1:
The patent changes the composition parameters by using R125 (40-60%) and R134a (40-60%) as base components with specific proportion ranges, adjusting the physical and chemical parameters to achieve compatibility with R22 systems while meeting environmental requirements. The specific composition ranges are optimized to match the working pressure and lubricant compatibility of existing R22 equipment.
Solution Approach 2:
The patent creates a composite refrigerant formulation by combining multiple components (R125, R134a, and optionally R32, R143a, R600, or R600a) in specific proportions. This composite approach allows the refrigerant mixture to achieve properties that individual components cannot provide alone, specifically compatibility with R22 systems while maintaining environmental friendliness.
2Adaptability or versatility
If substitutes such as R417A, R422D developed specifically for R22 are used, then compatibility with R22 systems is achieved, but refrigeration efficiency is low
Solution Approach 1:
The patent optimizes the composition parameters within specific ranges (R125: 40-60%, R134a: 40-60%) to achieve the best balance between compatibility and refrigeration efficiency. By allowing flexible proportion ranges rather than fixed ratios, the formulation can be adjusted to maintain high efficiency while ensuring system compatibility.
Solution Approach 2:
The patent includes optional additional components (R32, R143a, R600, or R600a) at 0-10% that can be added to enhance refrigeration efficiency. This partial action approach allows the base formulation to ensure compatibility while the optional components provide efficiency enhancement when needed.
3Object-affected harmful factors
If R22 units are eliminated or replaced due to environmental protection requirements, then environmental harm is reduced, but resource waste and capital investment increase
Solution Approach 1:
The patent creates a universal refrigerant formulation that can serve both environmental protection requirements and existing R22 system compatibility. This multi-functional refrigerant can be used in both new environmentally-friendly systems and existing R22 equipment, eliminating the need for equipment replacement and avoiding resource waste.
Solution Approach 2:
The patent acts as an intermediary solution between the old R22 system and new environmental requirements. The refrigerant formulation serves as a mediator that allows existing R22 equipment to continue operating with an environmentally-friendly alternative, bridging the gap without requiring equipment elimination or replacement.
4Object-affected harmful factors
If existing refrigerant alternatives are used, then environmental protection is improved, but replacement cost increases
Solution Approach 1:
The patent optimizes composition parameters to use commonly available refrigerant components (R125, R134a) in specific proportions, making the formulation cost-effective to manufacture. The flexible composition ranges allow for economical production while meeting both environmental and performance requirements.
Solution Approach 2:
The patent uses inexpensive, readily available refrigerant components as the base of the formulation. By selecting common refrigerants (R125, R134a) that are already widely produced and distributed, the replacement cost is minimized while achieving environmental protection goals.
Data Source
AI summary
The invention relates to a refrigerant composition and its preparation method, which is characterized by the composition of the following weight percentages:1,1,1-trifluoroethane: 1-3%Difluoromethane: 8-12%Pentafluoroethane: 40-44%1,1,1,2-tetrafluoroethane: 42-46%N-butane: 2-4%.Compared with the existing technology, the refrigerant composition provided by the present invention can be used to replace R22 and charged directly into such refrigeration and air conditioning systems as household air conditioner/heat pump unit, unitary air conditioners, refrigeration condensing units, water chillers and other. And the present invention is very close to the physical parameters of R22, compatible with the lubricating oil, conduits and components of the existing R22 system and can also be directly charged to replace R22 with a low cost and good refrigeration efficiency and cooling effect. Moreover, this invention will not deplete the stratospheric ozone layer while having a simple preparation method.