Working medium, heat cycle composition, heat cycle device, and heat cycle method
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Solution Overview
Problem
Existing refrigerants like HFC-134a have high global warming potential (GWP) and flammability, and compositions containing HFO-1234ze(E) do not adequately address these issues, leading to increased temperature glide and discharge temperatures in thermal cycles.
Innovation Solution
A working medium comprising (E)-1,3,3,3-tetrafluoropropene, (Z) 1-chloro-2,3,3,3-tetrafluoropropene, and 1,1,1,2-tetrafluoroethane, with specific mass ratios, is used to reduce GWP, flammability, and temperature glide, while maintaining efficient thermal cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFC-134a is used as a refrigerant, then flammability is reduced (non-flammable), but global warming potential increases (GWP = 1300)
Solution Approach 1:
The patent changes the chemical composition parameters by replacing HFC-134a with HFO-1234ze(E) which has fundamentally different molecular structure (contains carbon-carbon double bond) and thermodynamic properties, achieving both low GWP (<1) and acceptable flammability (2L category)
Solution Approach 2:
The patent creates a composite refrigerant mixture containing HFO-1234ze(E) combined with other components in specific ratios (HFO-1234ze(E): 36-56 wt%, other components: 44-64 wt%), where the composite achieves optimized balance between environmental performance and safety characteristics
2Object-generated harmful factors
If HFO-1234ze(E) content is increased to reduce GWP, then environmental impact is reduced, but specific heat ratio increases and discharge temperature increases
Solution Approach 1:
The patent optimizes the concentration parameter of HFO-1234ze(E) within the range of 36-56 wt% (not exceeding 64 wt%), which balances the reduction of GWP while controlling the specific heat ratio and discharge temperature through precise compositional control
Solution Approach 2:
The patent applies local quality by assigning specific functional roles to different components in the mixture, where HFO-1234ze(E) provides low GWP and other components modulate the thermodynamic properties to control discharge temperature
3Object-generated harmful factors
If HFO-1234ze(E) is used as a refrigerant, then ozone layer impact is reduced, but flammability increases (2L category - slightly flammable)
Solution Approach 1:
The patent changes the flammability parameter by controlling HFO-1234ze(E) content within 36-56 wt% range, where the concentration is high enough to provide environmental benefits but limited to prevent excessive flammability, maintaining safety within acceptable boundaries
4Object-generated harmful factors
If refrigerant composition is optimized to reduce GWP, then environmental impact is reduced, but temperature glide increases
Solution Approach 1:
The patent optimizes the compositional parameters of the refrigerant mixture to achieve a balance where GWP is reduced while temperature glide is controlled, using specific ratios of HFO-1234ze(E) and other components to minimize the difference between dew point and boiling point temperatures
Data Source
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AI summary
A working medium contains (E)-1,3,3,3-tetrafluoropropene, (Z) 1-chloro-2,3,3,3-tetrafluoropropene, and 1,1,1,2-tetrafluoroethane, wherein, with respect to a total content of the (E)-1,3,3,3-tetrafluoropropene, the (Z) 1-chloro-2,3,3,3-tetrafluoropropene, and the 1,1,1,2-tetrafluoroethane, a content of the 1,1,1,2-tetrafluoroethane is 14.5% by mass or less, a content of the (Z) 1-chloro-2,3,3,3-tetrafluoropropene is 10.0% by mass or less, and a content of the (E)-1,3,3,3-tetrafluoropropene is 75.5% by mass or more.