Refrigerator
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Solution Overview
Problem
Conventional refrigerators often fail to maintain optimal storage conditions, leading to quality deterioration of stored goods due to excessive temperature fluctuations and inadequate control over supercooling or overheating.
Innovation Solution
A refrigerator with a controller that selectively operates cooling and heating modes, along with a standby mode, to maintain a target temperature range by adjusting the operation of cooling and heating means, and includes an airflow mechanism to minimize rapid temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooler is continuously operated to maintain low temperature, then the storage chamber temperature can be kept low, but the goods may suffer from supercooling and quality deterioration
Solution Approach 1:
The controller operates the cooler in periodic cycles rather than continuously, switching between cooling mode and standby mode. The cooling operation is interrupted by standby periods where both cooler and heater are stopped, allowing the storage chamber temperature to stabilize and preventing continuous cooling that would cause supercooling and quality deterioration of goods.
2Reliability
If the heater is continuously operated to prevent supercooling, then goods quality can be maintained, but the storage chamber temperature may exceed the target range causing overheating
Solution Approach 1:
The controller uses temperature sensor feedback to intelligently switch between cooling mode, heating mode, and standby mode. Based on the sensed storage chamber temperature, the controller determines the appropriate mode: cooling mode when temperature is high, heating mode when temperature is low, and standby mode when temperature is within the target range, thereby preventing both supercooling and overheating while maintaining goods quality.
3Loss of time
If rapid temperature adjustment is implemented to quickly reach target temperature, then response time is reduced, but temperature fluctuations increase causing quality deterioration
Solution Approach 1:
The controller implements periodic cooling and heating cycles with standby intervals, avoiding continuous rapid temperature adjustments. This periodic operation allows the temperature to change gradually within controlled ranges, reducing temperature fluctuations that would otherwise cause quality deterioration while still achieving target temperature within acceptable time.
4Use of energy by moving object
If both cooler and heater are stopped to save energy, then energy consumption is reduced, but temperature control precision deteriorates
Solution Approach 1:
The controller periodically stops both cooler and heater during standby mode to reduce energy consumption, while maintaining temperature control precision through intelligent switching. The controller monitors temperature continuously and resumes cooling or heating operations when temperature approaches the target range boundaries, achieving a balance between energy savings and temperature control accuracy.
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 ensures reliable storage conditions, minimizing quality deterioration by maintaining temperatures within a narrow range and quickly adjusting to user-set targets, while reducing the risk of supercooling or overheating.
Implementation Method 1
a cooler configured to cool the storage chamber
Implementation Method 2
a heater configured to heat the storage chamber
Data Source
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.