Thermal Pellet Storage for Temperature-Sensitive Item Stabilization
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Solution Overview
Problem
Temperature-sensitive items, such as pharmaceuticals and biological materials, face temperature fluctuations in both active and passive storage containers, leading to potential damage or spoilage due to inadequate temperature control.
Innovation Solution
A thermally-stabilized contents container filled with thermal pellets, which are made from materials with high specific heat and low thermal conductivity, is used to surround and bury temperature-sensitive contents, providing thermal mass and reducing temperature variations within the storage area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If passive storage containers use ice or phase change material to maintain temperature, then the storage area can be kept at a stable temperature, but the temperature varies significantly with location inside the container and contents in contact with ice can fall below the desired temperature range
Solution Approach 1:
The invention divides the thermal mass into many small individual pellets rather than using a single large ice block or phase change material. This segmentation allows the thermal mass to be distributed uniformly throughout the container, providing consistent temperature stabilization at all locations without creating cold spots where contents could be damaged by direct contact with large ice masses.
Solution Approach 2:
Each thermal pellet is designed with specific local properties (small size, high specific heat capacity, appropriate melting point) to optimize its thermal stabilization function. The pellets can be distributed non-uniformly based on local requirements, with higher concentrations in areas needing greater thermal stability, while still maintaining overall temperature control throughout the container.
2Temperature
If active refrigeration systems are used to maintain desired temperature, then the storage temperature can be controlled, but the refrigeration unit cycles on and off causing temperature fluctuations of 8-10°C or more in the storage area
Solution Approach 1:
The thermal pellets are pre-cooled to the desired storage temperature before being placed in the container. This preliminary cooling action stores thermal energy in the pellets, which then acts as a buffer to absorb heat during refrigeration off-cycles, preventing temperature spikes and maintaining stable storage conditions without requiring continuous active refrigeration.
3Temperature
If large amounts of phase change material are used to maintain temperature, then temperature stability can be improved, but the container size and weight increase significantly
Solution Approach 1:
The invention changes the physical parameters of the thermal mass by using small pellets with high specific heat capacity materials rather than traditional ice. This parameter change allows achieving the same thermal stabilization effect with significantly reduced mass, as the high specific heat capacity of the pellet material provides greater thermal energy storage per unit mass compared to ice.
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 thermal pellets effectively stabilize the temperature of sensitive items, maintaining them within a desired range (e.g., 2-8°C) by retarding thermal energy transfer and minimizing temperature fluctuations, thus protecting the contents from damage and spoilage.
Implementation Method 1
thermal pellets, which are made from materials with high specific heat and low thermal conductivity... retarding thermal energy transfer
Implementation Method 2
providing thermal mass and reducing temperature variations within the storage area
Data Source
AI summary
Thermally-stabilizing pellets are used in a contents container to stabilize the temperature at which temperature sensitive contents are stored in the container. The pellets provide a thermal buffer between the stored contents and the environment outside the contents container that retards the rate of temperature change of the stored contents. The stored contents do not experience the extremes in temperature variation within a passive or active thermally insulated container when at least partially buried in the pellets. The pellets can also help isolate the stored contents from phase change materials that could thermally damage the stored contents with physical contact.