Modular Chilling-Panel Refrigerator for Off-Grid Vaccine Storage
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Solution Overview
Problem
Conventional refrigeration equipment is ineffective in areas without a reliable electricity supply, making it difficult to maintain the required temperature range for vaccines, food, and beverages, as they are sensitive to temperature fluctuations and require consistent cooling.
Innovation Solution
A portable refrigeration apparatus with a modular design featuring chilling panels that use a water solution and thermally conductive materials, incorporating a cooling element such as ice or thermoelectric devices, and a dynamic temperature regulation system that maintains a temperature range of 4° C to 8° C for extended periods without a power supply, utilizing solar panels for energy when available.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional refrigeration equipment is used, then cooling function is provided, but it requires reliable electricity supply which is unavailable in remote areas
Solution Approach 1:
The system pre-cools a water reservoir to below 4°C before power loss occurs. This pre-cooled water then serves as a thermal energy storage medium that passively maintains the refrigerated space temperature for extended periods without electricity, resolving the contradiction between reliability and energy dependency
Solution Approach 2:
The invention changes the operating parameter from active compressor-based cooling to passive thermosiphon convection cooling. By utilizing natural convection currents driven by temperature differences in the water reservoir, the system eliminates dependency on electricity-powered compressors while maintaining effective cooling
2Temperature
If active cooling is used to maintain temperature, then temperature control is achieved, but power consumption increases during outages
Solution Approach 1:
The thermosiphon system is self-regulating and requires no external power input. Natural convection currents automatically circulate water between the heat exchanger and reservoir based on temperature differences, providing continuous passive cooling that maintains temperature accuracy without consuming additional power during outages
Solution Approach 2:
The invention replaces the mechanical compressor system with a passive thermosiphon convection system. This substitution eliminates the need for electricity-powered mechanical components while achieving equivalent temperature control through natural physical phenomena
3Ease of operation
If ice is used for cooling, then portability is improved, but temperature regulation precision deteriorates
Solution Approach 1:
The system changes from using solid ice directly in contact with goods to using a liquid water reservoir at controlled sub-4°C temperature. This parameter change allows for more precise temperature regulation while maintaining the portability advantage of using water instead of large quantities of 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 apparatus effectively maintains the temperature range necessary for vaccine and food storage even in the absence of a reliable electricity supply, ensuring the viability of vaccines and perishable items for an extended duration.
Implementation Method 1
The cooling element 318 is cooled to a temperature typically at or below the freezing point of water
Implementation Method 2
ice or thermoelectric devices
Implementation Method 3
The water solution 114 is thermally conductive and in thermal communication with the payload compartment 304
Implementation Method 4
The reservoir 104 is constructed of a thermally insulative material
Implementation Method 5
utilizing solar panels for energy when available
Data Source
AI summary
The present application is related to a portable refrigeration apparatus for vaccines, food items, beverage containers, or any other item. The apparatus includes a refrigerated container comprised of a plurality of substantially identical chilling panels interconnected to form a sealed container that defines an internal volume, each of the chilling panels containing a cooling element. The refrigerated container encloses an internal storage space and has a generally modular design to facilitate packaging and transportation. The apparatus permits the internal storage space to maintain a temperature in the range of 4° C.˜8° C. for a long period of time following a loss of electrical power.