Refrigerator Compartment Lighting for Food-Specific Freshness Control
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Solution Overview
Problem
Existing refrigerators lack an effective method to maintain the freshness of various foods by selecting the appropriate light wavelength based on food type, leading to uneven freshness preservation, unnecessary power consumption, and potential decay due to ethylene generation.
Innovation Solution
A refrigerator with multiple keeping compartments and light-emitting diodes (LEDs) that adjust their wavelength based on the food's color, using sensors to determine the presence and type of food, and incorporating purification devices to remove ethylene, ensuring optimal light exposure and minimizing energy usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single type of light irradiation device is used for all food types, then the device structure is simple, but the freshness preservation is uneven across different food types
Solution Approach 1:
The light irradiation device is divided into multiple independent light sources, each emitting a specific wavelength (red light at 660nm, blue light at 450nm, green light at 530nm). Each wavelength targets specific food types based on their photosynthetic pigment characteristics, allowing differentiated treatment for optimal freshness preservation without requiring a complex centralized control system.
Solution Approach 2:
The light irradiation device is designed to serve multiple food types simultaneously using different wavelengths. The same device structure can irradiate red light for red-based vegetables, blue light for green vegetables, and green light for yellow vegetables, making the device universally applicable to various food types while maintaining structural simplicity.
2Reliability
If light irradiation is continuously applied to maintain freshness, then freshness is maintained, but power consumption increases
Solution Approach 1:
The light irradiation device operates periodically rather than continuously. The control unit activates specific light sources based on detected food types and maintains irradiation only when food is present in the keeping compartment. This periodic operation significantly reduces power consumption while maintaining freshness through targeted light exposure at appropriate intervals.
Solution Approach 2:
The system incorporates a food detection mechanism that provides feedback to the control unit. When food is detected in the keeping compartment, the control unit activates the appropriate light source; when no food is present, the light is turned off. This feedback-based control ensures light irradiation is applied only when necessary, optimizing both freshness maintenance and energy efficiency.
3Illumination intensity
If strong light is used to illuminate food, then visibility is improved, but chlorophyll decomposition and transpiration are accelerated
Solution Approach 1:
Instead of using strong broad-spectrum light, the system applies specific wavelengths (red 660nm, blue 450nm, green 530nm) that match the absorption characteristics of photosynthetic pigments in different vegetables. This localized wavelength selection provides sufficient illumination for freshness maintenance while avoiding the harmful effects of excessive intensity that would cause chlorophyll decomposition and accelerated transpiration.
Solution Approach 2:
The system changes the parameter of light wavelength rather than increasing light intensity. By selecting specific wavelengths that correspond to the absorption peaks of chlorophyll and other photosynthetic pigments, the system achieves effective light utilization for maintaining freshness without the harmful effects associated with high-intensity illumination, thus preventing chlorophyll decomposition.
4Adaptability or versatility
If multiple keeping compartments are provided for different food types, then freshness preservation is improved, but device complexity increases
Solution Approach 1:
The system uses a dynamic control approach where a single keeping compartment can be dynamically assigned to different food types based on detection. The control unit determines the food type present and activates the corresponding light wavelength, eliminating the need for multiple fixed compartments. This dynamic allocation maintains adaptability for different food types while keeping the physical structure simple.
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 maintains food freshness by tailoring light exposure to each food type, reducing chlorophyll degradation, and preventing fruit decay, while minimizing power consumption and temperature increase.
Implementation Method 1
irradiation devices irradiating light of a visible ray area to the keeping compartments
Implementation Method 2
irradiating light of a visible ray area to the keeping compartments, thereby preventing the concentration of chlorophyll from being reduced
Implementation Method 3
purification devices provided in the keeping compartments to remove ethylene generated from the food kept in the keeping compartments
Data Source
AI summary
A refrigerator and a method for keeping food items fresh therein are provided. The refrigerator may include a main body, storage compartments provided in the main body to store food items therein, and irradiation devices that irradiate visible light into the storage compartments. The irradiation devices may switch a wavelength of irradiated light depending on the type of food items stored in the corresponding storage compartment. The refrigerator may also include a sensor that senses whether food items are stored in the storage compartments, and purification devices provided in the compartments to remove ethylene generated by the food items stored in the storage compartments.