Azeotropic Working Fluid Composition for Heat Cycle Systems
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Solution Overview
Problem
Existing heat cycle systems face challenges with non-azeotropic working fluids, which experience composition changes during transfer and leakage, leading to uncontrollable fluid behavior and large temperature glides, posing environmental and performance issues.
Innovation Solution
An azeotropic or azeotrope-like composition comprising 1-chloro-2,3,3,3-tetrafluoropropene (HCFO-1224yd) and (E)-1-chloro-3,3,3-trifluoropropene (HCFO-1233zd(E)) with a mass ratio of 85:15, providing a stable and environmentally friendly working fluid with minimal composition change and temperature glide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a non-azeotropic composition is used as a working fluid, then the working fluid can be used in heat cycle systems, but the composition changes during transfer and leakage, leading to uncontrollable fluid behavior and large temperature glides
Solution Approach 1:
The patent changes the key parameter of the working fluid composition by using an azeotropic mixture of HCFO-1224yd and HCFO-1233zd(E) in a specific ratio (30-70 mass%). This azeotropic composition ensures that the vapor and liquid phases have the same composition, preventing composition changes during phase transitions, transfer, or leakage operations, thereby resolving the stability issue while maintaining heat cycle system usability
2Productivity
If a non-azeotropic composition is used as a working fluid, then the working fluid can be used in heat cycle systems, but the temperature glide becomes large, affecting heat cycle performance
Solution Approach 1:
The patent changes the compositional parameters to create an azeotropic mixture where the temperature glide is minimized to 0.1°C or less. This is achieved by selecting specific components (HCFO-1224yd and HCFO-1233zd(E)) and controlling their mass ratio within 30-70%, which ensures that the boiling and condensation temperatures remain nearly constant throughout the phase change process, thereby improving heat cycle performance
3Productivity
If CFCs or HCFCs are used as working fluids, then excellent heat cycle performance is achieved, but they cause ozone layer depletion
Solution Approach 1:
The patent changes the chemical composition parameters by replacing ozone-depleting CFCs and HCFCs with HCFO compounds that contain carbon-carbon double bonds. These HCFO compounds have similar thermodynamic properties for heat cycle performance but differ in chemical stability - the double bonds make them more susceptible to decomposition by OH radicals in the atmosphere, preventing them from reaching the stratosphere and depleting the ozone layer
4Object-affected harmful factors
If HFCs are used as working fluids, then ozone layer protection is improved, but they cause global warming
Solution Approach 1:
The patent changes the molecular structure parameters by introducing carbon-carbon double bonds to create HCFO compounds. This structural modification reduces the global warming potential compared to saturated HFCs while maintaining the ozone-friendly特性. The double bonds increase reactivity with atmospheric OH radicals, leading to faster degradation in the troposphere and reduced contribution to global warming
Data Source
AI summary
To provide an azeotrope-like composition which provides a working fluid for heat cycle with a small composition change, with a small temperature glide and with excellent cycle performance, and a working fluid for heat cycle employing the azeotrope-like composition, and a heat cycle system. An azeotropic or azeotrope-like composition consisting of 1-chloro-2,3,3,3-tetrafluoropropene and (E)-1-chloro-3,3,3-trifluoropropene, and a working fluid for heat cycle comprising it.