Platy Chemical Heat Storage on Metal Net to Prevent Cracking
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Solution Overview
Problem
Existing chemical heat storage technologies face issues with durability and deformation due to volume changes during reactions, leading to cracking and reduced performance over time.
Innovation Solution
A plate-shaped chemical heat storage system utilizing a metal net substrate with a chemical heat storage material composition, which includes additives like heat conductive fillers and reinforcing fibers, supports the material on the substrate's outer surface and mesh, enhancing thermal conductivity and anchoring effects to maintain shape and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a chemical heat storage material is molded into a plate shape, then the heat storage amount per unit mass is high, but the material undergoes volume change during reaction causing deformation and cracking
Solution Approach 1:
The patent applies a flexible coating film on the plate-shaped chemical heat storage material. This film accommodates the volume changes during chemical reactions (dehydration/hydration) without restricting the material's expansion or contraction, thereby preventing cracking while maintaining the high heat storage density of the plate structure.
Solution Approach 2:
The patent creates a composite structure by combining the chemical heat storage material (such as calcium hydroxide or magnesium hydroxide) with a flexible coating material. This composite approach allows the rigid heat storage material to benefit from the flexibility of the coating layer, solving the contradiction between maintaining plate shape for high density and accommodating volume changes during reaction.
2Reliability
If the chemical heat storage material is constrained to maintain shape, then durability is improved, but thermal response speed decreases
Solution Approach 1:
The flexible coating film provides a solution that simultaneously addresses both requirements: it maintains the overall plate shape and prevents cracking (improving durability), while its flexibility allows for rapid thermal response by not constraining the material's natural expansion and contraction during heat storage and release cycles.
3Shape
If a rigid structure is used to prevent deformation, then shape stability is improved, but the material cannot accommodate volume changes during reaction
Solution Approach 1:
The flexible coating film acts as an intermediate layer that maintains the plate's external shape stability while internally accommodating the volume changes of the chemical heat storage material during dehydration and hydration reactions. The film's flexibility allows it to deform slightly with the material without compromising overall structural integrity.
Solution Approach 2:
The composite structure combines a rigid plate-shaped heat storage material with a flexible coating material, creating a system where the rigid core provides shape stability and the flexible coating provides volumetric adaptability during chemical reactions.
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 plate-shaped design provides excellent shape retention, high thermal response, and efficient heat storage per unit weight, with the substrate absorbing volume changes to prevent cracking and maintain performance over multiple cycles.
Implementation Method 1
a gaseous working medium such as water reacts with the chemical heat storage material, and the heat absorption or heat generation at that time is utilized
Implementation Method 2
the heat absorption or heat generation at that time is utilized
Implementation Method 3
the heat absorption or heat generation at that time is utilized
Implementation Method 4
the substrate composed of the net absorbs the volume change and prevents cracking and pulverization
Implementation Method 5
a chemical heat storage material composition, which includes additives like heat conductive fillers and reinforcing fibers
Data Source
Figure 1~2
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Figure 5~7
AI summary
A platy chemical heat-storage object which comprises a substrate constituted of a metallic net and a heat-storage material composition fixed to the substrate, wherein the heat-storage material composition includes at least one compound selected from the group consisting of the hydroxide or oxide of magnesium, the hydroxide or oxide of strontium, the hydroxide or oxide of barium, the hydroxide or oxide of calcium, and calcium sulfate and further, according to need, includes at least one substance selected from the group consisting of titanium dioxide, silicon dioxide, alumina silicate fibers, E-glass fibers, and cellulose.