HFO-1132 Working Medium for Low-GWP Heat Cycle Performance
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Solution Overview
Problem
Current working mediums for heat cycles, such as hydrofluorocarbons (HFCs), have significant global warming potential and ozone layer depletion concerns, and existing hydrofluoroolefins (HFOs) are insufficient in cycle performance.
Innovation Solution
A working medium comprising 1,2-difluoroethylene (HFO-1132) with optional hydrocarbons, HFCs, hydrochlorofluoroolefins, or chlorofluoroolefins, which improves thermodynamic properties and cycle performance, reducing global warming impact and ozone layer influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFCs are used as working medium, then ozone layer depletion is reduced, but global warming potential increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters by introducing HFO-1132 (1,2-difluoroethylene) with specific molecular structure characteristics (carbon-carbon double bond) that fundamentally alter both ozone depletion potential and global warming potential, achieving dual improvement through parameter transformation
Solution Approach 2:
The patent creates a composite working medium by combining HFO-1132 with other fluorinated compounds in specific ratios, leveraging the synergistic effects of different components to simultaneously reduce ozone layer impact and global warming potential while maintaining excellent cycle performance
2Object-generated harmful factors
If existing HFOs are used as working medium, then global warming potential is reduced, but cycle performance becomes insufficient
Solution Approach 1:
The patent optimizes critical parameters including the carbon-carbon double bond configuration, fluorine substitution pattern, and molecular structure of HFO-1132 to achieve optimal balance between environmental performance and thermodynamic properties, resulting in superior cycle efficiency and capacity
Solution Approach 2:
The patent introduces specific local structural features in the HFO-1132 molecule, particularly the positioning of fluorine atoms and the double bond configuration, to enhance specific thermodynamic properties while maintaining overall environmental benefits
3Object-generated harmful factors
If carbon dioxide is used as coolant, then global warming potential is reduced, but equipment pressure becomes extremely high
Solution Approach 1:
The patent changes the physical chemical parameters of the working medium by selecting HFO-1132 with appropriate critical temperature and pressure characteristics, achieving operating pressures comparable to conventional HFCs while maintaining low global warming potential
4Productivity
If HFC-134a is used as coolant, then cycle performance is maintained, but global warming potential reaches 1430 and leakage risk increases
Solution Approach 1:
The patent transforms the molecular structure parameters from saturated HFC-134a to unsaturated HFO-1132 with carbon-carbon double bond, fundamentally changing the global warming potential while preserving the thermodynamic properties necessary for excellent cycle performance
Data Source
AI summary
To provide a working medium for heat cycle 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 (the efficiency and the capacity), and a heat cycle system excellent in the cycle performance (the efficiency and the capacity). A working medium for heat cycle comprising 1,2-difluoroethylene 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).