Composition for heat cycle system, and heat cycle system
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Solution Overview
Problem
Current heat cycle systems using hydrofluorocarbons (HFCs) face challenges with high global warming potential and instability under compression and heating conditions, leading to decreased lubricity and cycle performance.
Innovation Solution
A composition for a heat cycle system comprising a mixture of unsaturated fluorinated hydrocarbon compounds, such as trifluoroethylene and 2,3,3,3-tetrafluoropropene, combined with saturated fluorinated hydrocarbons like difluoromethane, and a refrigerant oil with specific properties to enhance lubricity and cycle performance while reducing global warming impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If hydrofluorocarbon (HFC) working fluids are used to replace CFCs and HCFCs, then ozone layer protection is improved, but global warming potential increases
Solution Approach 1:
The patent changes the chemical composition parameters by introducing HFO-1123 (unsaturated fluorinated hydrocarbon) with specific molecular structure characteristics (carbon-carbon double bond) that fundamentally alter the working fluid's environmental interaction, resulting in dramatically reduced GWP while maintaining ozone safety
Solution Approach 2:
The patent creates a composite working fluid system by combining HFO-1123 with specific refrigerant oils (polyol ester or polyvinyl ether) in defined proportions, where the composite achieves both low global warming potential and acceptable lubricity properties that neither component could achieve alone
2Object-generated harmful factors
If unsaturated fluorinated hydrocarbon compounds (HFO) are used as working fluids, then global warming potential is reduced and cycle performance is improved, but stability under compression and heating conditions deteriorates
Solution Approach 1:
The patent introduces refrigerant oil as an intermediary substance that mediates between the unstable HFO-1123 working fluid and the metal surfaces in the heat cycle system, protecting the HFO from direct degradation while maintaining its low GWP and cycle performance benefits
Solution Approach 2:
The patent optimizes the proportion parameters of HFO-1123 and refrigerant oil in the composition, finding that specific ratios (HFO-1123: 20-80 mass%, refrigerant oil: 20-80 mass%) achieve the optimal balance between stability improvement and maintaining low GWP characteristics
3Object-generated harmful factors
If unsaturated fluorinated hydrocarbon compounds (HFO) are used as working fluids, then global warming potential is reduced, but lubricating properties deteriorate
Solution Approach 1:
The patent develops a composite lubrication system combining HFO-1123 with refrigerant oil having specific properties (breakdown voltage ≥25 kV, hydroxy value ≤0.1 mgKOH/g, aniline point -100°C to 0°C), where the refrigerant oil component provides the necessary lubricating properties while the HFO-1123 maintains low GWP
Solution Approach 2:
The refrigerant oil acts as an intermediary lubricant that compensates for the insufficient lubricating properties of HFO-1123, allowing the system to achieve both low environmental impact and reliable lubrication without requiring separate lubricant systems
Data Source
Figure 1~2
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, which comprises a working fluid for heat cycle containing an unsaturated fluorinated hydrocarbon compound having a specific structure, and a refrigerant oil having a breakdown voltage of at least 25 kV, a hydroxy value of at most 0.1 mgKOH/g, and an aniline point of at least -100°C and at most 0°C, and a heat cycle system employing the composition for a heat cycle system.