Refrigeration cycle device
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Solution Overview
Problem
HFO1123 and HFO1132, although having a lower global warming potential than R410A, are less stable and prone to disproportionation reactions due to radical generation, which can convert them into other compounds.
Innovation Solution
A refrigeration cycle device with a control system that includes a compressor, condenser, and evaporator, using ethylene-based fluoroolefin as a refrigerant, and a control device to monitor and control the compressor's operation based on detected abnormalities and temperature to prevent disproportionation reactions by stopping the drive circuit when anomalies are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFO1123 or HFO1132 is used as a working medium to reduce GWP, then the global warming potential is reduced, but the chemical stability deteriorates and disproportionation reactions occur
Solution Approach 1:
A radical scavenger substance is introduced as an intermediary component in the working medium to capture radicals before they can cause disproportionation reactions. The radical scavenger acts as a mediator between the unstable HFO molecules and the radical species, preventing harmful reactions while maintaining the low GWP benefits of HFO1123 or HFO1132.
Solution Approach 2:
The working medium is formulated as a composite mixture containing HFO1123 or HFO1132 combined with a radical scavenger substance. This composite approach allows the system to benefit from the low GWP of HFO while the added scavenger component provides chemical stability and prevents disproportionation reactions.
2Productivity
If the compressor operates continuously to maintain refrigeration, then the cooling performance is maintained, but the internal temperature increases and promotes disproportionation reactions
Solution Approach 1:
The control device implements periodic monitoring of the compressor's internal temperature and operates the compressor in a cyclic manner with scheduled pauses. This periodic operation allows temperature management, preventing excessive heat buildup that would promote disproportionation reactions while still maintaining overall cooling performance through repeated compression cycles.
Solution Approach 2:
The control device incorporates temperature sensing and feedback control to monitor the compressor's internal temperature in real-time. When the temperature approaches levels that promote disproportionation reactions, the control device adjusts or stops compression operations, creating a closed-loop control system that maintains temperature within safe limits while preserving cooling efficiency.
Data Source
AI summary
The refrigeration cycle device includes a control device controlling a compressor of a refrigeration cycle circuit allowing circulation of a working medium containing ethylene-based fluoroolefin as a refrigerant component. The compressor includes: a sealed container constituting a fluidic pathway for the working medium; and a compression mechanism and an electric motor inside the sealed container. The control device includes: a drive circuit driving the electric motor; a state detection circuit detecting a state of at least one of the compressor or the drive circuit; a temperature measurement circuit measuring an internal temperature of the sealed container; and a control circuit controlling the drive circuit. The control circuit (stops operation of the drive circuit during a state where an abnormality of at least one of the compressor or the drive circuit has been detected based on the state and the internal temperature has exceeded a predetermined temperature.