Heat Cycle Working Fluid Composition for Low GWP and Lubricity
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Solution Overview
Problem
Current heat cycle systems using trifluoroethylene (HFO-1123) face instability and reduced lubricity under compression and heating, leading to inferior performance compared to saturated hydrofluorocarbons, while also having high global warming potential.
Innovation Solution
A composition for a heat cycle system comprising trifluoroethylene (HFO-1123) combined with a refrigerant oil, such as ester or polyglycol oils, and optionally saturated hydrofluorocarbons like difluoromethane or HFC-32, to enhance lubricity and maintain low global warming potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If trifluoroethylene (HFO-1123) is used as a working fluid to reduce global warming potential, then environmental impact is improved, but lubricity and stability under compression and heating deteriorate
Solution Approach 1:
The patent combines trifluoroethylene (HFO-1123) with specific refrigerant oils (ester oils, polyglycol oils, or hydrocarbon oils) to create a working fluid mixture that merges the low GWP advantage of HFO-1123 with the lubricity and stability advantages of the oil components, resolving the contradiction between environmental performance and operational reliability
Solution Approach 2:
The invention creates a composite working fluid system by formulating specific compositions of HFO-1123 (10-90 mass%) with refrigerant oils (10-90 mass%), where the composite mixture exhibits both low global warming potential and improved lubricity/stability characteristics that neither component alone could achieve
2Reliability
If saturated hydrofluorocarbons are used to improve lubricity and stability, then reliability is improved, but global warming potential increases
Solution Approach 1:
The patent merges the lubricity and stability properties of saturated hydrofluorocarbons with the low GWP characteristics of trifluoroethylene (HFO-1123) by creating a mixed working fluid composition, allowing the system to benefit from both the reliability of saturated compounds and the environmental advantages of HFO-1123
3Object-affected harmful factors
If trifluoroethylene is used to achieve low global warming potential, then environmental performance is improved, but cycle performance under compression and heating deteriorates
Solution Approach 1:
The patent optimizes the composition parameters of the working fluid by adjusting the ratio of trifluoroethylene (HFO-1123) to refrigerant oil (within 10-90 mass% ranges), and by selecting specific oil types and viscosity ranges (1-750 mm²/s at 40°C, 1-100 mm²/s at 100°C), to achieve a balance between low GWP and high cycle performance under compression and heating conditions
Data Source
AI summary
To provide a composition for a heat cycle system having favorable lubricating properties and comprising a working fluid for heat cycle which has a low global warming potential and which can replace R410A and a heat cycle system employing the composition.A composition for a heat cycle system comprising a working fluid for heat cycle containing trifluoroethylene, and a refrigerant oil (for example, an ester refrigerant oil, an ether refrigerant oil, a polyglycol refrigerant oil or a hydrocarbon refrigerant oil), and a heat cycle system employing the composition for a heat cycle system.