Dual-Compressor Refrigeration Control for Stable Cabinet Temperature
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Solution Overview
Problem
Existing refrigerating apparatuses face challenges in accurately controlling internal temperatures while minimizing the number of compressor activations, leading to increased power consumption and reduced component lifespan due to frequent compressor operations.
Innovation Solution
A refrigerating apparatus with two refrigerant circuits and a temperature sensor that alternates the operation of compressors, ensuring continuous operation until the temperature reaches a lower set point, thereby reducing the frequency of compressor activations and maintaining temperature within a preset range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If both compressors are operated frequently to maintain temperature accuracy under increased internal load, then temperature control accuracy is improved, but power consumption increases and component lifespan decreases
Solution Approach 1:
The patent implements dynamic compressor operation where the system transitions from static on/off control to dynamic alternating operation. The control device switches between first and second compressors based on operational cycles, allowing the system to adapt to varying thermal loads while maintaining temperature accuracy. This dynamic approach enables the system to meet cooling demands without continuously operating both compressors, thereby reducing power consumption and extending component life.
2Measurement precision
If both compressors are operated frequently to maintain temperature accuracy under increased internal load, then temperature control accuracy is improved, but component lifespan decreases
Solution Approach 1:
The patent employs periodic action by implementing alternating operational cycles between the first and second compressors. The control device manages compressor operation in scheduled intervals, switching between compressors based on predefined cycles rather than continuous operation. This periodic operation pattern maintains temperature control accuracy while significantly reducing the cumulative operating hours of each individual compressor, thereby extending their operational lifespan and improving overall system reliability.
3Power
If compressor activation frequency is increased to handle increased internal load, then cooling capacity is improved, but activation current losses increase
Solution Approach 1:
The system dynamically manages compressor activation by implementing intelligent switching between the first and second compressors. Rather than frequently activating both compressors simultaneously which would generate excessive activation current losses, the control device orchestrates alternating operation patterns. This dynamic control maintains adequate cooling capacity to handle increased internal loads while minimizing the number of activation events, thereby reducing energy losses associated with repeated compressor startup currents.
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 effectively controls internal temperatures while reducing compressor activation frequency, prolonging component lifespan and lowering power consumption by optimizing compressor operation based on temperature thresholds.
Implementation Method 1
a refrigerant discharged from the first compressor being condensed at the first condenser and thereafter evaporated at the first evaporator to acquire a cooling effect
Implementation Method 2
the first evaporator and the second evaporator being disposed to cool the internal portion at the same time
Data Source
AI summary
A refrigerating apparatus includes first and second refrigerant circuits including respective first and second compressors, condensers, pressure reducers, and evaporators, connected circularly with first and second refrigerant pipes, respectively, refrigerants discharged from the first and second compressors being respectively condensed at the first and second condensers and thereafter respectively evaporated at the first and second evaporators to acquire a cooling effect; a temperature sensor that detects a temperature of an internal portion of a cold storage cabinet, the first and second evaporators being disposed to cool the internal portion simultaneously; and a first control device that controls the first and second compressors such that the first compressor and the second compressor start being alternately operated each time a temperature detected by the temperature sensor reaches a first temperature, and are continuously operated until the detected temperature reaches a second temperature lower than the first temperature.