Heat Cycle Circuit Protection for HFO-1123 Decomposition Risk
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Solution Overview
Problem
Trifluoroethylene (HFO-1123) used as a working fluid in heat cycles undergoes self-decomposition at high temperatures or high pressures, posing risks during abnormal operation states.
Innovation Solution
A heat cycle system with a current-limiting apparatus that limits current within milliseconds upon abnormal operation, suppressing energy from spark sources to prevent self-decomposition, and using a working fluid composition with HFO-1123 in excess of 50% and optional components like difluoromethane and 2,3,3,3-tetrafluoro-1-propene to maintain low global warming potential and refrigerating capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFO-1123 is used as a working fluid for heat cycle, then global warming influence is reduced and cycle performance is improved, but self-decomposition reaction occurs at high temperature or high pressure
Solution Approach 1:
A current-limiting apparatus is introduced as an intermediary protective device in the electrical circuit of the compressor. This apparatus limits the current to 6A or less within 6 milliseconds when abnormal operation is detected, preventing spark-induced self-decomposition of HFO-1123 while allowing normal operation to proceed
Solution Approach 2:
The current-limiting apparatus is configured to act preemptively by detecting abnormal operation states (such as excessive current or voltage) and limiting the current before a dangerous spark can occur. This preliminary protective action prevents the self-decomposition reaction from initiating in the first place
2Reliability
If current-limiting apparatus is added to prevent self-decomposition, then safety is improved, but device complexity increases
Solution Approach 1:
The current-limiting apparatus is designed to operate automatically based on pre-set parameters (6A current limit, 6ms response time). When abnormal conditions are detected, the apparatus self-activates to limit the current without requiring external control systems, microprocessors, or complex control logic, thereby maintaining system simplicity while providing effective protection
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 system effectively prevents self-decomposition of HFO-1123 during abnormal operations, ensuring safe and efficient heat cycle performance while minimizing global warming impact.
Implementation Method 1
trifluoroethylene (HFO-1123) is known to undergo self-decomposition with an ignition source at high temperature or under high pressure
Implementation Method 2
suppressing an energy which the working fluid for heat cycle receives from a spark energy generated in the heat cycle system
Data Source
AI summary
A heat cycle system with high durability, which employs a working fluid for heat cycle containing trifluoroethylene having a low global warming potential. A heat cycle system, having a circulation path in which a working fluid for heat cycle containing trifluoroethylene is circulated from a compressor via a condenser, an expansion valve and an evaporator to the compressor, wherein the compressor has in its electrical circuit a current-limiting apparatus capable of limiting the current within 6 milliseconds after the heat cycle system enters into an abnormal operation state.