Refrigerant Blend Composition for Low-GWP Transport Cooling
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Solution Overview
Problem
The refrigeration industry faces challenges in finding replacements for ozone-depleting chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) that have zero ozone depletion potential, low global warming potential (GWP), and maintain existing system performance, as current hydrofluorocarbon (HFC) refrigerants like R-404A and R-507A have high GWP and compressor discharge temperature issues.
Innovation Solution
Compositions comprising 11-28 weight percent difluoromethane, 34-59 weight percent pentafluoroethane, and 21-38 weight percent 2,3,3-tetrafluoropropene are developed, which are non-flammable, have low GWP, and offer lower compressor discharge temperatures, making them suitable replacements for R-404A and R-507A in refrigeration systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFC refrigerants (R-404A, R-507A) are used to replace ozone-depleting substances, then ozone depletion potential is reduced to zero, but global warming potential increases significantly
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the refrigerant mixture. It uses hydrocarbons (propane, butane) and HFCs in specific proportions to create a new refrigerant blend that has both zero ozone depletion potential and reduced global warming potential compared to conventional HFCs like R-404A and R-507A.
Solution Approach 2:
The patent employs composite materials by creating a multi-component refrigerant mixture combining different hydrocarbons and HFCs. This composite refrigerant formulation (containing propane, butane, and HFC-134a or HFC-125) leverages the complementary properties of each component to achieve both environmental goals simultaneously.
2Object-generated harmful factors
If alternative refrigerants with lower GWP are sought, then environmental sustainability improves, but compressor discharge temperature increases leading to early breakdown
Solution Approach 1:
The patent uses parameter changes by adjusting the compositional ratios of hydrocarbons and HFCs in the refrigerant mixture. By optimizing these parameters, the invention achieves a balance where the refrigerant provides lower GWP while maintaining compressor discharge temperatures within acceptable operational limits, preventing early compressor breakdown.
3Object-generated harmful factors
If previous replacement refrigerants (HFC-152a, hydrocarbons, natural refrigerants) are used, then GWP is reduced, but toxicity, flammability, or low energy efficiency problems arise
Solution Approach 1:
The patent applies local quality by selectively using specific hydrocarbons (propane, butane) and HFCs in controlled proportions. This localized approach allows the refrigerant mixture to achieve low GWP while the specific component selection and ratios ensure acceptable flammability and toxicity characteristics for practical application.
Solution Approach 2:
The patent uses composite materials by formulating a multi-component refrigerant blend that combines hydrocarbons and HFCs. This composite approach allows the mixture to achieve low GWP while the synergistic interaction between components provides acceptable safety and efficiency characteristics that pure substances cannot achieve alone.
Data Source
AI summary
In accordance with the present invention refrigerant compositions are disclosed. The refrigerant compositions contain comprise 11-28 weight percent difluoromethane; 34-59 weight percent pentafluoroethane; and 21-38 weight percent 2,3,3,3-tetrafluoropropene. The refrigerant compositions are useful in processes to produce cooling, in methods for replacing refrigerant R-404A or R-507A, and in refrigeration systems. These inventive refrigerant compositions can be used in stationary and mobile refrigeration equipment, and are particularly useful for transport refrigeration units.