Refrigerator appliances with passive storage compartments
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Solution Overview
Problem
Conventional refrigerator appliances do not provide optimal storage conditions for fruits and vegetables, as the typical fresh food chamber temperatures (36-44°F) are either too low or too high compared to their ideal storage range (48-58°F), leading to reduced food life.
Innovation Solution
A passive in-door storage compartment within the refrigerator door that maintains a temperature between 46-60°F, utilizing insulation layers and venting for passive heat exchange, allowing for storage of fruits and vegetables at optimal conditions without active heating or cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If food is stored in the fresh food chamber at typical refrigerator temperatures (36-44°F), then the food is kept cool and preserved, but the temperature is too low for optimal storage of fruits and vegetables (which require 48-58°F), reducing their shelf life
Solution Approach 1:
The fresh food door is segmented into multiple storage compartments: a first compartment for cold-sensitive items (fruits and vegetables) and a second compartment for other fresh food items. This segmentation allows different temperature zones within the same door structure, enabling optimal storage conditions for different food types without requiring separate refrigerator units.
Solution Approach 2:
The first compartment is provided with enhanced insulation (first insulation layer) compared to the second compartment, creating a localized thermal environment. This local quality enhancement maintains a higher temperature (48-58°F) in the first compartment while the second compartment remains at standard refrigerator temperatures (36-44°F), allowing each zone to serve its specific storage purpose optimally.
2Temperature
If food is stored in the ambient environment outside the refrigerator, then fruits and vegetables can be stored at optimal temperatures (48-58°F), but the food is exposed to higher temperatures that accelerate spoilage and reduce shelf life
Solution Approach 1:
The first compartment acts as an intermediary thermal zone between the cold fresh food chamber (36-44°F) and the warm ambient environment (above 58°F). The insulation layers and door construction create a buffer zone that maintains temperatures in the 48-58°F range, protecting temperature-sensitive foods from both excessive cold and excessive heat, thereby extending shelf life.
3Duration of action of stationary object
If a passive storage compartment is added to the fresh food door to provide intermediate temperature storage, then optimal storage conditions for fruits and vegetables are achieved, but the device complexity increases
Solution Approach 1:
The passive storage compartment is merged with the fresh food door structure itself, rather than being a separate unit. The first and second compartments are integrated into the door, sharing common structural elements and insulation layers. This merging approach provides the temperature differentiation needed for extended food shelf life while minimizing the increase in overall device complexity.
Solution Approach 2:
The first compartment utilizes the thermal mass and insulation of the door structure to passively maintain its temperature in the 48-58°F range without requiring active cooling or heating systems. The compartment self-regulates its temperature by leveraging the existing thermal properties of the door and insulation layers, reducing mechanical complexity while achieving the desired temperature control for extended food preservation.
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 passive storage compartment effectively prolongs the life of stored foods by maintaining temperatures within the optimal range for fruits and vegetables, offering an inexpensive and uncomplicated solution beyond traditional refrigeration limits.
Implementation Method 1
utilizing insulation layers and venting for passive heat exchange
Implementation Method 2
utilizing insulation layers and venting for passive heat exchange
Data Source
AI summary
A refrigerator appliance includes a cabinet defining a fresh food chamber, and a fresh food door rotatably hinged to the cabinet for accessing the fresh food chamber. The fresh food door includes an inner surface, an outer surface and a side surface extending between the inner surface and the outer surface. The fresh food door is rotatable between an open position and a closed position. The refrigerator appliance further includes a passive storage compartment defined within the fresh food door, and a compartment door coupled to one of the inner surface or the outer surface for accessing the storage compartment. The compartment door is movable between an open position and a closed position. The passive storage compartment maintains a temperature greater than a fresh food chamber temperature and less than an ambient temperature when the fresh food door and compartment door are closed and the refrigerator appliance is operational.