1,2-Difluoroethylene Working Medium for Low-GWP Heat Cycle Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing working media for heat cycles, such as hydrofluorocarbons (HFCs) and hydrofluoroolefins (HFOs), pose environmental concerns due to ozone depletion and global warming, and have insufficient cycle performance, necessitating a medium with reduced environmental impact and improved efficiency.
Innovation Solution
A working medium comprising 1,2-difluoroethylene (HFO-1132) with optional additives like hydrocarbons, HFCs, HCFOs, and CFOs, which enhances thermodynamic properties and cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFC-134a is used as a coolant, then the ozone layer is protected, but global warming potential becomes extremely high (1,430)
Solution Approach 1:
The patent changes the chemical composition parameters of the working medium by introducing HFO-1234yf and HFO-1225ye with specific physical and chemical properties. This composition change achieves low global warming potential while maintaining acceptable ozone layer protection, resolving the contradiction between these two environmental factors.
Solution Approach 2:
The patent creates a composite working medium by combining HFO-1234yf and HFO-1225ye in specific proportions. This composite approach allows the system to leverage the complementary strengths of each component, achieving both low global warming potential and acceptable ozone protection that neither component could achieve alone.
2Object-generated harmful factors
If carbon dioxide is used as a coolant, then global warming potential is reduced, but equipment pressure becomes extremely high
Solution Approach 1:
The patent changes the pressure-temperature parameters of the heat cycle system by using HFO-1234yf and HFO-1225ye as the working medium. These substances operate at moderate pressure levels that are significantly lower than carbon dioxide, while still achieving low global warming potential, thus resolving the pressure contradiction.
3Object-generated harmful factors
If HFO-1243zf, HFO-1234ze, or HFO-1261yf are used as working media, then environmental impact is reduced, but cycle performance becomes insufficient
Solution Approach 1:
The patent creates a composite working medium by combining HFO-1234yf and HFO-1225ye in specific proportions (60-99 mass% HFO-1234yf and 1-40 mass% HFO-1225ye). This composite approach optimizes the cycle performance while maintaining low environmental impact, resolving the contradiction between these two factors.
Solution Approach 2:
The patent optimizes the compositional parameters of the working medium to achieve the desired cycle performance. By carefully selecting the ratio of HFO-1234yf to HFO-1225ye, the system achieves improved cycle performance while maintaining low global warming potential and acceptable ozone protection.
4Productivity
If HFO-1234yf and HFO-1225ye are used in specific proportions, then cycle performance is improved, but system complexity increases
Solution Approach 1:
The patent defines specific parameter ranges for the working medium composition (60-99 mass% HFO-1234yf and 1-40 mass% HFO-1225ye) that optimize cycle performance. By establishing these clear parameter specifications, the patent simplifies the implementation process while achieving improved cycle performance, thus resolving the complexity contradiction.
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 proposed medium reduces ozone depletion and global warming while improving cycle efficiency and capacity, allowing for reduced power consumption and system downsizing.
Implementation Method 1
a hydrofluoroolefin (HFO) 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 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).