Self-Heating Container With Passive Overheat Dissipation
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Solution Overview
Problem
Existing self-heating containers lack effective passive thermal control mechanisms to prevent overheating when activated without a heat sink, posing safety risks and the need for a responsive system to moderate heating beyond intended limits.
Innovation Solution
Incorporating a passive thermal control system that uses thermally responsive materials to dissipate excess energy when a heat sink is absent, ensuring the temperature of the heater and container do not exceed safe limits by decomposing and releasing steam, thereby moderating the temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a self-heating container is activated without a heat sink, then the heater generates sufficient heat to heat contents, but the temperature exceeds safe limits causing overheating and burn risks
Solution Approach 1:
A passive thermal control material is introduced as an intermediary between the heater and the container. This material remains stable during normal heating operations but decomposes at excessive temperatures to absorb excess thermal energy and prevent overheating, thus mediating between the heating function and safety requirements.
Solution Approach 2:
The thermal control material undergoes a parameter change (decomposition) at a specific temperature threshold. This decomposition reaction absorbs excess thermal energy when the temperature exceeds safe limits, automatically regulating the temperature parameter to prevent overheating without requiring active control systems.
2Reliability
If a passive thermal control material is added to prevent overheating, then safety is improved, but the device complexity increases
Solution Approach 1:
The thermal control material provides self-service safety protection by automatically decomposing at excessive temperatures to absorb excess heat. This passive mechanism requires no external control systems, sensors, or power sources, thereby improving safety without significantly increasing device complexity.
Solution Approach 2:
The thermal control material functions as a disposable safety component that is consumed only when needed (during overheating events). Under normal operating conditions, it remains stable and inert, providing safety protection without adding ongoing complexity to the system.
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 thermal control system effectively prevents overheating in empty containers, safely dissipating excess energy and maintaining safe temperatures, enhancing user safety and preventing burns.
Implementation Method 1
If the temperature of the heat passing through the passive thermal control material exceeds the material's decomposition temperature, the passive thermal control material decomposes and thereby dissipates heat
Implementation Method 2
The thermal energy is transmitted through the wall of an immediately adjacent container to uniformly heat the interior contents
Implementation Method 3
A spontaneous exothermic reaction 105 between the starting fluid and pellet generates heat
Data Source
AI summary
A modular heating system and method is presented that automatically dissipates thermal energy from a heater or heated package if the energy cannot be assimilated without excessive temperature increase. A heater containing reactants that generate heat when combined is placed in thermal contact with a passive thermal control material which is in thermal contact with a container configured to contain a substance to be heated. The passive thermal control material allows the transmission of heat between the heater and the container as long as the temperature of the heat passing through the passive thermal control material does not exceed the activation temperature of the material. If the temperature of the heat passing through the passive thermal control material exceeds the material's decomposition temperature, the passive thermal control material decomposes and thereby dissipates heat.