Heat-Cycle Working Medium Composition for Low-GWP Cycle Performance
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Solution Overview
Problem
Current working mediums for heat cycles, such as hydrofluorocarbons (HFCs), pose environmental concerns due to high global warming potential and ozone layer influence, while alternatives like hydrochlorofluorolefins (HCFOs) lack sufficient cycle performance.
Innovation Solution
A working medium comprising 1-chloro-2,3,3,3-tetrafluoropropene (HCFO-1224yd) with a high halogen proportion, easily decomposed by OH radicals, combined with hydrocarbons and HFCs or hydrofluoroolefins, to suppress combustibility and enhance cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFCs (such as HFC-134a) are used as working medium, then ozone layer protection is improved, but global warming potential increases and combustibility safety deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by introducing HCFO-1224yd with specific molecular structure (containing carbon-carbon double bond and chlorine atom) to achieve both low ozone layer influence and low global warming potential while maintaining safety
Solution Approach 2:
The patent uses composite working medium formulations combining HCFO-1224yd with other refrigerants (such as HFC-134a, HFC-125, or HFO-1234yf) in specific proportions to balance environmental performance and cycle performance
2Object-generated harmful factors
If HCFO-1233zd(E) is used as working medium, then combustibility is suppressed and ozone layer influence is reduced, but cycle performance deteriorates
Solution Approach 1:
The patent changes the molecular structure parameters by selecting HCFO-1224yd with specific atomic composition and bonding configuration, which improves cycle performance while maintaining suppressed combustibility and low environmental impact
Solution Approach 2:
The patent discards HCFO-1233zd(E) which has insufficient cycle performance and recovers/adopts HCFO-1224yd which provides both safety and excellent cycle performance
3Object-generated harmful factors
If carbon dioxide is used as working medium, then global warming potential is reduced, but equipment pressure increases
Solution Approach 1:
The patent changes the thermodynamic parameters by selecting working mediums with appropriate saturation pressure characteristics, achieving low global warming potential while maintaining equipment pressure at manageable levels
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 solution provides a heat cycle system with reduced ozone layer and global warming impact, improved efficiency, and capacity, ensuring safety and enabling system downsizing through reduced power consumption.
Implementation Method 1
having a carbon-carbon double bond which is easily decomposed by OH radicals in the air
Data Source
AI summary
To provide a working medium for heat cycle, of which combustibility is suppressed, which has less influence over the ozone layer, which has less influence over global warming and which provides a heat cycle system excellent in the cycle performance (efficiency and capacity), and a heat cycle system, of which the safety is secured, and which is excellent in the cycle performance (efficiency and capacity).A working medium for heat cycle comprising 1-chloro-2,3,3,3-tetrafluoropropene is employed for a heat cycle system (such as a Rankine cycle system, a heat pump cycle system, a refrigerating cycle system 10 or a heat transport system).