Latent Heat Cold Storage Material Supercooling Inhibition
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Solution Overview
Problem
Conventional latent heat cold storage materials require excessive electric energy for cooling due to high melting temperatures and supercooling, making them unsuitable for freezing preservation at -10°C or lower temperatures.
Innovation Solution
A latent heat cold storage material comprising a mixed aqueous solution of sodium chloride and ammonium chloride, with the addition of a crystalline powder such as 1,3-diethylurea, which acts as a supercooling inhibitor, allowing solidification at a higher temperature (-29°C or higher) and reducing the energy required for cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional latent heat cold storage materials are used, then freezing preservation at -10°C or lower can be achieved, but excessive electric energy is required for cooling due to high melting temperatures and supercooling
Solution Approach 1:
The patent changes the physical-chemical parameters of the cold storage material by adding a supercooling inhibitor (crystalline powder such as 1,3-diethylurea) to the aqueous solution of inorganic salts. This parameter change raises the solidification point from below -10°C to -29°C or higher, directly reducing the energy required for cooling while maintaining freezing preservation capability
Solution Approach 2:
The supercooling inhibitor acts as an intermediary substance that mediates between the aqueous solution and the freezing process. It promotes crystallization at higher temperatures by providing nucleation sites, thereby enabling the system to achieve solidification at -29°C or higher without requiring excessive cooling energy
2Reliability
If the melting temperature is kept high for effective heat storage, then freezing preservation capability is maintained, but the energy required for cooling increases excessively
Solution Approach 1:
The patent optimizes the parameter balance between solidification point and latent heat by incorporating a supercooling inhibitor. This allows the system to maintain a solidification point of -29°C or higher (improving reliability for freezing preservation) while reducing the temperature gap between storage and usage conditions, thereby decreasing the cooling energy required
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 solution enables efficient freezing preservation at -10°C or lower temperatures by reducing the energy needed for cooling, as the crystalline powder promotes crystallization and increases the solidification point, thereby lowering the energy consumption.
Implementation Method 1
a mixed aqueous solution of sodium chloride and ammonium chloride, with the addition of a crystalline powder such as 1,3-diethylurea, which acts as a supercooling inhibitor, allowing solidification at a higher temperature (-29°C or higher)
Implementation Method 2
the crystalline powder promotes crystallization and increases the solidification point
Implementation Method 3
a heat storage material which mainly utilizes an exothermic/endothermic reaction associated with a phase change in a substance is called a latent heat storage material
Implementation Method 4
suitable for freezing preservation in a temperature range of -10°C or lower
Data Source
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AI summary
Provided is a latent heat cold storage material containing: water; a crystalline powder; and at least one inorganic salt. The crystalline powder is formed of a compound having a saturated concentration of less than 7.0 wt% to an aqueous solution of the inorganic salt having a concentration of 25 wt% at 25°C. A concentration of the crystalline powder exceeds a saturated concentration of the crystalline powder to the aqueous solution of the inorganic salt at 25°C.