Composition for heat cycle system, and heat cycle system
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Solution Overview
Problem
The existing heat cycle systems using trifluoroethylene (HFO-1123) face instability under compression and heating conditions, leading to self-decomposition and reduced performance, while also having a high global warming potential.
Innovation Solution
A composition for a heat cycle system is developed, comprising trifluoroethylene as the working fluid stabilized by additives such as oxidation resistance-improving agents and refrigerant oils, which includes a combination of saturated hydrofluorocarbons like difluoromethane and hydrofluoroolefins like HFO-1234yf, along with stabilizers like phenol compounds and aromatic amines, to enhance stability and reduce 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 performance is improved, but stability under compression and heating conditions deteriorates
Solution Approach 1:
A stabilizer is introduced as an intermediary substance to prevent the self-decomposition of trifluoroethylene during compression and heating. The stabilizer acts as a mediator that protects the working fluid from deteriorating while allowing the system to benefit from the low GWP properties of HFO-1123.
Solution Approach 2:
The patent creates a composite working fluid system by combining trifluoroethylene with a stabilizer and refrigerant oil. This composite composition maintains the low environmental impact of HFO-1123 while adding substances that prevent decomposition and ensure stable operation under heat cycle conditions.
2Object-affected harmful factors
If HFO-1123 is used to achieve low global warming potential, then environmental performance is improved, but the working fluid life is reduced due to self-decomposition
Solution Approach 1:
The stabilizer is added in advance to the working fluid composition to prevent self-decomposition before it occurs. This preliminary protective action extends the working fluid life by preventing degradation reactions during storage and operation.
Solution Approach 2:
The stabilizer serves as a protective intermediary that extends the lifespan of trifluoroethylene by preventing its self-decomposition during repeated heat cycle operations, thereby prolonging the working fluid life while maintaining low GWP.
3Productivity
If pure trifluoroethylene is used to maximize cycle performance, then refrigerating capacity is improved, but stability and reliability deteriorate
Solution Approach 1:
The patent develops a composite composition that combines trifluoroethylene with stabilizer and refrigerant oil in specific proportions. This composite maintains high refrigerating capacity while the added substances provide stability during compression and heating, resolving the contradiction between performance and reliability.
Solution Approach 2:
The patent optimizes the composition parameters by specifying precise ranges for trifluoroethylene (5-95 mass%), stabilizer (0.01-5 mass%), and refrigerant oil (0.1-10 mass%). By adjusting these parameters, the system achieves both high refrigerating capacity and stability under operating conditions.
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 solution provides a stable working fluid with reduced global warming potential and improved cycle performance, prolonging the life of the fluid and maintaining high efficiency in heat cycle operations.
Implementation Method 1
a stabilizer for preventing deterioration of the working fluid for heat cycle... the stabilizer is at least one stabilizer selected from an oxidation resistance-improving agent
Implementation Method 2
a composition for a heat cycle system, which comprises a working fluid for heat cycle containing trifluoroethylene, and a stabilizer for preventing deterioration of the working fluid for heat cycle and which further contains a refrigerant oil
Data Source
Figure 1~2
AI summary
To provide a composition for a heat cycle system, which comprises a working fluid for heat cycle which has a low global warming potential and high stability, 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 trifluoroethylene, and a stabilizer for preventing deterioration of the working fluid for heat cycle, such as an oxidation resistance-improving agent, a heat resistance-improving agent or a metal deactivator, and a heat cycle system employing the composition for a heat cycle system.