HFO-1132 Working Medium Composition for Low-GWP Heat Cycle Systems
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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, while alternatives like 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
Solution Approach 1:
The invention changes the chemical composition parameters by using HFO-1132 (1,2-difluoroethylene) as the primary working medium component, which has fundamentally different environmental characteristics compared to conventional HFCs. This parameter change achieves both low ozone depletion potential and low global warming potential simultaneously.
Solution Approach 2:
The invention employs composite working medium formulations by combining HFO-1132 with other refrigerants in specific proportions (as shown in the patent's composition ranges). This composite approach optimizes both environmental performance and thermodynamic properties to resolve the contradiction between reducing ozone depletion and minimizing global warming impact.
2Object-generated harmful factors
If conventional HFOs are used as working medium, then environmental impact is reduced, but cycle performance becomes insufficient
Solution Approach 1:
The invention changes the chemical structure parameter by selecting HFO-1132 (1,2-difluoroethylene) with specific molecular characteristics that differ from conventional HFOs. This parameter change improves thermodynamic properties including cycle performance while maintaining low environmental impact.
Solution Approach 2:
The invention applies local quality optimization by carefully selecting specific components and their concentration ranges in the working medium composition. The patent specifies precise composition ranges for HFO-1132 and other components to achieve optimal cycle performance in specific system conditions while maintaining environmental benefits.
3Productivity
If HFO-1132 is used as working medium, then cycle performance is improved, but system complexity may increase
Solution Approach 1:
The invention changes the operating parameters and composition ratios to optimize cycle performance with HFO-1132. By adjusting the working medium composition and system operating conditions as parameters, the patent achieves improved cycle performance without requiring fundamental system redesign, thus limiting the increase in system complexity.
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 HFO-1132-based medium enhances refrigerating cycle efficiency and capacity, leading to reduced power consumption and system downsizing, while minimizing environmental impact.
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).