Fluid Flow Insulation for Thermal Storage Heat Loss Control
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Solution Overview
Problem
Current thermal energy storage systems face challenges in efficiently storing and delivering thermal energy from variable renewable energy sources, including high costs, thermal runaway issues, and the inability to maintain uniform temperatures, which limits their effectiveness in industrial applications.
Innovation Solution
A thermal energy storage system that uses vertically oriented thermal storage units with stacks of bricks and resistive heaters connected via switching circuitry, employing radiative heat transfer for charging and convective heat transfer for discharging, along with a dynamic insulation system to manage temperature and reduce energy losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermal energy storage systems are used, then thermal energy can be stored, but thermal runaway occurs and temperatures become non-uniform
Solution Approach 1:
The storage system is divided into multiple discrete thermal storage units (TSUs) arranged in arrays. Each TSU contains segmented heating zones with independently controllable heaters, allowing localized temperature management and preventing thermal runaway from propagating across the entire system.
Solution Approach 2:
The system incorporates temperature sensors and controllers that continuously monitor thermal conditions and adjust heater operation in real-time. This feedback mechanism maintains uniform temperatures across all TSUs and prevents thermal runaway by detecting and correcting temperature anomalies immediately.
2Quantity of substance
If high-temperature thermal energy is stored, then energy density increases, but heat loss to surroundings increases
Solution Approach 1:
The insulation system dynamically adjusts its properties based on operating conditions. Variable insulation materials change their thermal resistance in response to temperature differences, providing enhanced insulation when heat loss is greatest and reducing resistance when temperature gradients are smaller, optimizing energy retention throughout the storage cycle.
Solution Approach 2:
The system employs composite insulation structures combining multiple materials with different thermal properties. These composite insulation layers create complex thermal pathways that significantly reduce heat transfer to surroundings while maintaining the high-temperature storage capability, achieving both high energy density and low heat loss.
3Quantity of substance
If multiple thermal storage units are used, then storage capacity increases, but system complexity increases
Solution Approach 1:
Each thermal storage unit is designed as a universal module that can perform multiple functions: storing thermal energy, distributing heat to multiple outlets, and regulating temperature through integrated heating and insulation systems. This multi-functionality allows the system to achieve high storage capacity while minimizing the number of separate components needed.
Solution Approach 2:
The system employs a hierarchical nested structure where multiple TSUs are arranged in arrays within a common framework. Insulation layers are nested around each TSU and between them, creating a compact integrated system that maximizes storage capacity within a confined space while reducing overall structural complexity through standardized modular arrangements.
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 enables efficient storage and delivery of high-temperature thermal energy, reducing costs and preventing thermal runaway, while maintaining uniform temperatures and extending the lifespan of heating elements.
Implementation Method 1
resistive heaters attached to the elements and configured to heat the elements
Implementation Method 2
employing radiative heat transfer for charging
Implementation Method 3
employing radiative heat transfer for charging and convective heat transfer for discharging
Implementation Method 4
a dynamic insulation system to manage temperature and reduce energy losses
Data Source
AI summary
A thermal energy storage system with fluid flow insulation, the system including heated thermal storage blocks positioned within a housing, and a method for operating the thermal energy storage system, including providing a flow of fluid into the housing, the fluid convectively extracting heat from a top region, a side region and a bottom region of the thermal energy storage system, to generate heated fluid that insulates the thermal storage blocks from the housing and a foundation of the thermal energy storage system.