Refrigeration device
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Solution Overview
Problem
In dual refrigerating apparatuses, discrepancies in compressor specifications can lead to mismatched timing and biased changes in evaporation and condensation temperatures, prolonging the time to achieve a constant temperature in the storage and inside the storage.
Innovation Solution
A refrigerating apparatus with separate refrigerant circuits and sensors to detect cascade condenser and storage temperatures, allowing for variable control of compressor operations to maintain optimal temperature settings, ensuring faster and more precise temperature control within the storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If control is made based on a single sensor detecting storage temperature, then the control system is simple, but the timing and rate of temperature change in the cascade condenser and evaporator may not match, prolonging the time to reach constant temperature
Solution Approach 1:
The patent introduces dual feedback loops: one sensor monitors cascade condenser temperature and feeds back to control the high-temperature compressor, while another sensor monitors storage temperature and feeds back to control the low-temperature compressor. This dual feedback mechanism enables independent optimization of each compressor's operation, ensuring synchronized temperature changes and reducing the time to reach constant temperature.
Solution Approach 2:
The control system is segmented into two independent control loops, each managing one compressor based on its own temperature sensor. This segmentation allows each compressor to be controlled independently according to its specific performance characteristics, resolving the timing mismatch problem that occurs with unified control.
2Adaptability or versatility
If compressor specifications are made uniform, then manufacturing and operation are simplified, but performance variations still cause mismatched temperature change timing and rates
Solution Approach 1:
The patent changes the control parameter from unified temperature control to separate temperature control for each compressor. By monitoring cascade condenser temperature for the high-temperature compressor and storage temperature for the low-temperature compressor, the system adapts to performance variations in compressor specifications, ensuring reliable and stable temperature control regardless of manufacturing tolerances.
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
This solution improves controllability of storage temperatures by synchronizing compressor operations based on real-time temperature feedback, reducing the time required to reach and maintain a constant temperature.
Implementation Method 1
a cascade condenser constituted by integrating the first evaporator and the second condenser in a heat exchangeable manner
Data Source
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AI summary
A refrigerating apparatus for keeping an inside of a storage at a predetermined low-temperature state includes first and second refrigerant circuits including compressors, concensers, decompressors, and evaporators, connected circularly with pipings to form refrigerating cycles, the circuit having a first or second refrigerant sealed therein as a working refrigerant, a first sensor which detects a temperature of a cascade condenser constituted by integrating the evaporator of the first refrigerant circuit and the condenser of the second refrigerant circuit in a heat exchangeable manner, first and second controllers which control operation performances of the first and second compressors in a variable manner based on first-arid second-sensor-detected temperatures in order that the first- and second-sensor-detected temperatures are first and second temperatures, respectively, and a second sensor which detects a temperature inside the storage.