Baffled Thermoclines for Solid Thermal Medium Heat Transfer
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Solution Overview
Problem
In thermodynamic cycles like the Brayton cycle, direct heat transfer within the solid thermal medium in thermocline arrangements reduces the maximum temperature difference and overall thermal efficiency due to conductive and radiative heat transfer between different zones of the solid thermal medium.
Innovation Solution
Incorporating baffle structures within the heat exchanger vessel to segregate the solid thermal medium into zones, limiting direct heat transfer between them while allowing the working fluid to flow through and maintain a temperature gradient, thereby reducing conductive and radiative heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the solid thermal medium is arranged in a thermocline configuration without baffles, then heat transfer between the solid thermal medium and working fluid is enhanced, but direct heat transfer between different zones of the solid thermal medium reduces the maximum temperature difference and thermal efficiency
Solution Approach 1:
The thermocline vessel is segmented into multiple zones using baffle structures that divide the solid thermal medium into distinct temperature zones. These baffles prevent direct conductive and radiative heat transfer between zones while allowing the working fluid to flow through and maintain the temperature gradient, thereby preserving thermal efficiency.
Solution Approach 2:
Baffle structures act as intermediary elements between different temperature zones of the solid thermal medium. These baffles block direct heat transfer paths while permitting the working fluid to serve as the primary heat transfer medium, thus maintaining the desired temperature difference and reducing energy loss through unwanted conduction and radiation.
2Loss of energy
If baffle structures are introduced to limit direct heat transfer between zones, then the temperature gradient is maintained and thermal efficiency improves, but the device complexity increases
Solution Approach 1:
The vessel is divided into discrete zones using baffle structures, creating a segmented configuration that maintains temperature gradients. This segmentation approach achieves the thermal efficiency goal while keeping the structure manageable through modular zonation rather than continuous complex design.
Solution Approach 2:
The baffle structures serve multiple functions simultaneously: they block direct heat transfer between zones, provide structural support for the thermocline arrangement, and guide the working fluid flow paths. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
3Use of energy by moving object
If the solid thermal medium allows working fluid flow through it, then direct contact heat transfer is maximized, but conductive and radiative heat transfer between zones increases
Solution Approach 1:
The solid thermal medium is segmented into zones by baffles that block conductive and radiative heat transfer paths between zones. This segmentation allows the working fluid to maintain direct contact with the solid medium for efficient heat transfer while preventing unwanted heat transfer between different temperature zones through the solid medium itself.
Solution Approach 2:
Baffle structures serve as intermediaries that block direct heat transfer between zones of the solid thermal medium. These baffles allow the working fluid to continue flowing through the solid medium for heat exchange while preventing the solid medium from acting as a direct heat transfer path between zones, thus eliminating the harmful conductive and radiative heat transfer.
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 baffle structures effectively maintain a thermocline state, enhancing the temperature difference across the thermocline and improving the thermal efficiency of the cycle by minimizing unwanted heat transfer between zones.
Implementation Method 1
direct heat transfer between them while allowing the working fluid to flow through and maintain a temperature gradient, thereby reducing conductive and radiative heat transfer
Implementation Method 2
direct heat transfer between them while allowing the working fluid to flow through and maintain a temperature gradient, thereby reducing conductive and radiative heat transfer
Implementation Method 3
allowing the working fluid to flow through and maintain a temperature gradient
Data Source
AI summary
Solid-state thermoclines with internal baffle structures are in used in place of heat exchangers in a closed thermodynamic cycle power generation or energy storage system, such as a closed Brayton cycle system. The baffles limit the conductive and/or radiative transfer of heat between a solid thermal medium within different zones defined by the baffle structures.