Latent heat storage material, cold storage tool, distribution packing container, and cold storage tool for food
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Solution Overview
Problem
Existing latent heat storage materials with a melting point around −25°C require freezer compartments set to −35°C or lower for solidification, leading to high energy consumption, and those with a melting point between −25°C to −20°C have low latent heat and short cold storage times, especially when the temperature difference with the environment is large.
Innovation Solution
A latent heat storage material composed of 5 to 21 parts by weight of ammonium chloride, 2 to 13 parts by weight of potassium chloride, 5 to 23 parts by weight of urea, and 43 to 88 parts by weight of water, with a main melting point between −20°C to −23°C, is used, along with a cold storage tool design that includes a liquid-tight storage and a supercooling inhibitor to enhance solidification and extend cold storage time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a latent heat storage material with a melting point around −25°C is used to replace dry ice, then the cold storage temperature can be maintained at the required level, but the freezer compartment must be set to −35°C or lower for solidification, leading to high energy consumption
Solution Approach 1:
The patent changes the physical parameters of the latent heat storage material by adjusting the composition ratio of sodium chloride and water to achieve a melting point of −25°C to −20°C, which allows solidification at higher temperatures (−30°C to −25°C) and reduces energy consumption while maintaining effective cold storage temperature
Solution Approach 2:
The patent uses a composite material system consisting of sodium chloride and water in specific proportions (30-70 wt% NaCl, 70-30 wt% water) to create a latent heat storage material with optimized melting point and latent heat characteristics, balancing cold storage effectiveness with energy efficiency
2Use of energy by moving object
If a latent heat storage material with a melting point between −25°C to −20°C is used, then the set temperature required for the freezer compartment can be increased and power consumption can be suppressed, but the latent heat is lower than 333 J/g and the cold storage time period is short
Solution Approach 1:
The patent optimizes the composition parameters to achieve a balance between melting point (−25°C to −20°C) and latent heat content, ensuring sufficient cold storage duration while maintaining lower power consumption through moderate solidification temperatures
Solution Approach 2:
The patent references the eutectic composition of sodium chloride and water as a model system, copying its proven effectiveness while adjusting the composition to achieve the desired melting point range and latent heat characteristics for extended cold storage
3Temperature
If the melting point of the latent heat storage material is set to −25°C, then the cold storage temperature can be maintained, but the temperature difference with the environment is large, causing the amount of heat absorbed per unit time to increase and the consumption of the latent heat storage material to progress faster
Solution Approach 1:
The patent adjusts the melting point parameter from −25°C to a higher range of −25°C to −20°C, which reduces the temperature difference with the storage environment, thereby decreasing the heat absorption rate and extending the service life of the latent heat storage material while maintaining effective cold storage
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 material maintains objects at −20°C or lower for a prolonged period while reducing energy consumption by minimizing the temperature difference and using a supercooling inhibitor to facilitate solidification at common freezer temperatures.
Implementation Method 1
a latent heat storage material having a melting point around −25° C.
Implementation Method 2
The latent heat storage material is required to be solidified before use.
Implementation Method 3
a supercooling inhibitor to enhance solidification and extend cold storage time
Data Source
AI summary
Provided is a latent heat storage material capable of keeping an object to be refrigerated, such as frozen food or ice cream, cold at a temperature of −20° C. or lower for a long period of time, and of reducing power consumption required at a time of solidification. The latent heat storage material contains 5 to 21 parts by weight of ammonium chloride, 2 to 13 parts by weight of potassium chloride, 5 to 23 parts by weight of urea, and 43 to 88 parts by weight of water. The total of the ammonium chloride, the potassium chloride, the urea, and the water is 100 parts by weight, and the latent heat storage material has a main melting point in a range from −20° C. to −23° C.