Heat Cycle Fluid Composition for Low-GWP Lubricity Stability
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Solution Overview
Problem
Current heat cycle systems using hydrofluorocarbons (HFCs) face challenges with global warming potential and stability, particularly with unsaturated hydrofluorolefins (HFOs) that have short lifespans and inferior lubricity under compression and heating conditions.
Innovation Solution
A composition for a heat cycle system incorporating an unsaturated fluorinated hydrocarbon compound with specific refrigerant oils, such as polyol ester or polyvinyl ether refrigerant oils, to enhance lubricity and maintain low global warming potential, including a mixture of HFOs like HFO-1123 and HFC-32 with a refrigerant oil having a breakdown voltage of at least 25 kV and an aniline point temperature between −100°C and 0°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If unsaturated hydrofluorolefins (HFOs) are used as working fluid, then global warming potential is reduced, but stability and lubricating properties deteriorate under compression and heating conditions
Solution Approach 1:
The patent combines HFO-1123 (unsaturated compound with low GWP) with HFC-32 (saturated compound with good stability) and a specific refrigerant oil to create a composite working fluid mixture. This composite approach allows the system to benefit from the low global warming potential of HFO while the saturated HFC and refrigerant oil compensate for stability and lubrication deficiencies.
Solution Approach 2:
The patent introduces a specifically selected refrigerant oil as an intermediary substance that mediates between the HFO working fluid and the system components. The refrigerant oil with breakdown voltage ≥25 kV and aniline point between -100°C and 0°C provides lubricating properties and system stability, allowing the HFO to function effectively without suffering from its inherent lubricity deficiencies.
2Object-affected harmful factors
If refrigerant oil with high breakdown voltage is used to improve electrical insulation, then electrical safety is improved, but viscosity and flow characteristics may worsen
Solution Approach 1:
The patent specifies precise parameter ranges for the refrigerant oil: breakdown voltage of at least 25 kV, aniline point between -100°C and 0°C, and viscosity at 40°C between 2 and 200 mm²/s. By carefully controlling these parameters, the system achieves adequate electrical insulation while maintaining acceptable flow characteristics for heat cycle operation.
Data Source
AI summary
A composition for a heat cycle system and a heat cycle system employing the composition are provided. The composition has favorable lubricating properties and contains a working fluid for heat cycle and a refrigerant oil. The working fluid contains an unsaturated fluorinated hydrocarbon compound having a specific structure. The working fluid has a low global warming potential and can replace R410A. The refrigerant oil has a breakdown voltage of at least 25 kV, a hydroxyl value of at most 0.1 mgKOH/g, and an aniline point of at least −100° C. and at most 0° C.