Solid Ionic Thermal Storage Medium for Joule Heating Energy Systems
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Solution Overview
Problem
Existing thermal energy storage systems face challenges such as high costs, material degradation, and complex construction requirements, particularly with metal and molten salt systems, which hinder their scalability and efficiency.
Innovation Solution
A thermal system utilizing a solid storage medium composed of a thermal filler and an ionic compound, such as sodium chloride or calcium chloride, with embedded electrodes and an insulating frame, allowing for cost-effective and efficient thermal energy storage and conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal blocks are used for thermal energy storage, then good electrical properties and heat-storing capacity are achieved, but material degradation through expansion, melting, and rapid oxidation occurs
Solution Approach 1:
The patent uses a composite structure consisting of a metal block embedded within a ceramic material matrix. The metal provides excellent electrical conductivity and heat-storing capacity, while the surrounding ceramic material prevents oxidation and contains thermal expansion. This composite approach allows the system to benefit from the advantages of metal while mitigating its detrimental effects through the protective and stabilizing properties of the ceramic material.
2Reliability
If molten salts are used for thermal energy storage, then good electrical conductivity is achieved, but challenging containment requirements arise due to heat and corrosive environment
Solution Approach 1:
The patent changes the physical state parameter from liquid (molten salt) to solid (solid electrolyte ceramic). This phase change eliminates the corrosive and fluid-related containment challenges while maintaining adequate electrical conductivity for thermal energy storage. The solid state provides inherent structural stability and eliminates the need for specialized corrosion-resistant containment systems.
3Object-generated harmful factors
If metal and stone combinations are used for heat storage, then challenges of metal storage are alleviated, but construction cost remains high
Solution Approach 1:
The patent employs a porous ceramic matrix that provides structural support and protection for the embedded metal block. The porous structure allows for thermal management while using minimal amounts of expensive ceramic material, reducing overall construction costs compared to fully dense ceramic-metal composites. The porous material also facilitates heat distribution and reduces the quantity of metal 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 system provides stable, cost-effective thermal energy storage with reduced material degradation and simpler construction, enabling efficient energy conversion and utilization, including heating fluids for district heating or electricity generation.
Implementation Method 1
inducing a current through the storage medium by means of the first and second electrode, such that the storage medium is being heated
Implementation Method 2
the storage medium comprises a thermal filler and an ionic compound... the ionic compound being dissolved and distributed in the solid
Implementation Method 3
By insulating to block and minimizing thermal loss, it is possible to store the energy as thermal energy in the block for a prolonged period of time
Data Source
Figure 1~2
Figure 3
AI summary
A thermal system for thermal energy storage, the thermal system comprising a storage medium for the thermal energy storage, a first and a second electrode for inducing an electric current in the storage medium, the storage medium being arranged between the first and second electrode, the storage medium comprising a thermal filler and an ionic compound. A method for casting such a storage medium from one or more plasters and a solution comprising a dissolved ionic compound such as salt.