refrigerator
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Solution Overview
Problem
Conventional refrigerators fail to effectively minimize the deterioration of stored goods due to excessive temperature fluctuations and supercooling or overheating, leading to quality reduction.
Innovation Solution
A refrigerator with a temperature control system that switches between cooling, heating, and standby modes based on sensed temperature values, using a timer and airflow mechanisms to maintain a target temperature range, thereby minimizing rapid temperature changes and maintaining optimal storage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the refrigerator uses conventional temperature control, then the storage chamber can be cooled, but the temperature fluctuates excessively causing supercooling and quality deterioration
Solution Approach 1:
The temperature control unit continuously monitors the storage chamber temperature and dynamically adjusts the cooling and heating operations based on real-time temperature feedback. This closed-loop control prevents over-cooling by stopping the cooler before the temperature drops below the target range, and prevents over-heating by stopping the heater before the temperature rises above the target range, thereby maintaining stable temperature and preserving goods quality
Solution Approach 2:
The system takes preliminary actions to prevent temperature extremes before they occur. The controller anticipates temperature drops and stops the cooler in advance, and anticipates temperature rises and stops the heater in advance. This proactive approach prevents supercooling and overheating before they can damage the stored goods
2Speed
If the refrigerator uses rapid cooling to reach target temperature, then the temperature adjustment speed is improved, but the storage chamber may become supercooled
Solution Approach 1:
The temperature control unit operates the cooler and heater in periodic cycles rather than continuously. The controller alternates between cooling periods and heating periods based on temperature measurements, allowing the system to rapidly adjust temperature while preventing extreme deviations. This periodic operation enables fast response while maintaining temperature stability within the target range
3Temperature
If the refrigerator maintains continuous cooling operation, then the storage chamber temperature is kept low, but energy consumption increases and temperature control precision decreases
Solution Approach 1:
The system dynamically adjusts the cooling and heating operations based on real-time temperature conditions rather than operating continuously at fixed settings. The controller modulates the operation intensity and timing of the cooler and heater to match the actual thermal state of the storage chamber, enabling precise temperature control while minimizing energy consumption by avoiding unnecessary operation
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 ensures reliable storage by minimizing quality deterioration, quickly adjusting to user-set temperatures, and reducing the risk of supercooling or overheating, thus maintaining goods in optimal conditions.
Implementation Method 1
a cooling means for cooling the storage chamber
Implementation Method 2
a heating means for heating the storage chamber
Implementation Method 3
a temperature sensor for sensing a temperature of the storage chamber
Data Source
Figure 1
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Figure 3
AI summary
A refrigerator includes a cabinet in which a storage chamber is formed, a cooler configured to cool the storage chamber, a heater configured to heat the storage chamber, a temperature sensor configured to sense a storage chamber temperature, and a controller configured to control the cooler and the heater, in which the controller selectively performs a plurality of modes, the plurality of modes include a cooling mode in which the cooler is operated or stopped, a heating mode in which the heater is operated or stopped, and a standby mode in which the cooler and the heater are stopped, and the plurality of modes are performed in the order of the cooling mode, the standby mode, and heating mode, or are performed in the order of the heating mode, the standby mode, and the cooling mode.