Non-Linear Reactor Channel Assembly for Solar Hot Spot Mitigation
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Solution Overview
Problem
Reactor systems experience hot spots and thermal stress due to imperfections in solar concentrator optics, leading to reduced lifetime and increased costs.
Innovation Solution
The use of non-linear fluid channels in stacked configurations with counter-flow or counter-cross-flow patterns, allowing for thermal spreading and recuperation of thermal energy, reducing the severity of hot spots and thermal stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If solar concentrator optics are used to provide thermal energy for endothermic reactions, then energy efficiency is improved, but hot spots and thermal stress occur due to optical imperfections
Solution Approach 1:
The reactor channel is divided into multiple discrete heating zones along its length, with independent thermal control for each zone. This segmentation allows hot spots to be isolated and managed individually rather than affecting the entire channel, while still achieving high overall energy efficiency through targeted solar concentration in each zone.
Solution Approach 2:
Different sections of the reactor channel are provided with different thermal conditions and heating intensities according to the specific reaction requirements of each zone. This local quality approach allows optimal thermal management in each region, preventing uniform hot spots while maintaining high energy efficiency where needed.
2Ease of manufacture
If linear fluid channels are used in reactor systems, then manufacturing is simplified, but thermal spreading is limited and hot spots worsen
Solution Approach 1:
The reactor channels are designed with non-linear, curved geometries that follow spiral or serpentine paths rather than straight lines. This curvature increases the surface area for thermal spreading and distributes heat more evenly throughout the reaction zone, reducing hot spots while remaining manufacturable using standard fabrication techniques.
Solution Approach 2:
The channel design transitions from one-dimensional linear paths to two-dimensional curved paths that utilize the available reactor cross-sectional area more effectively. This dimensional change increases thermal contact area and improves heat distribution without significantly complicating the manufacturing process.
3Productivity
If conventional steam methane reforming is used, then hydrogen production is achieved, but carbon emissions increase and energy efficiency decreases
Solution Approach 1:
The system utilizes phase transition of water (liquid to vapor) as a heat transfer medium to carry thermal energy from solar concentration zones to reaction zones. This phase transition approach enables efficient thermal management and allows the endothermic reforming reaction to proceed at high temperatures without direct combustion, reducing carbon emissions while maintaining high hydrogen production efficiency.
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
This design enhances reactor efficiency and longevity by minimizing hot spots and thermal stress, achieving higher solar-to-chemical energy conversion efficiency and lower operating costs.
Implementation Method 1
a first set of fluid channels and a second set of fluid channels oriented in thermal contact with the first set of fluid channels
Implementation Method 2
Embodiments of the disclosure can also utilize solar energy or other heat sources to drive the endothermic reactions
Implementation Method 3
In the case of hydrogen production, current commercial technologies include conventional steam methane reforming
Implementation Method 4
The channels of either one or both sets of fluid channels can be non-linear. Stacked reactor assemblies are also provided that can include first and second sets of fluid channels in a stacked configuration with the fluid channels oriented in thermal contact with each other
Data Source
AI summary
Reactors are provided that can include a first set of fluid channels and a second set of fluid channels oriented in thermal contact with the first set of fluid channels. The reactor assemblies can also provide where the channels of either one or both of the first of the set of fluid channels are non-linear. Other implementations provide for at least one of the first set of fluid channels being in thermal contact with a plurality of other channels of the second set of fluid channels. Reactor assemblies are also provided that can include a first set of fluid channels defining at least one non-linear channel having a positive function, and a second set of fluid channels defining at least another non-linear channel having a negative function in relation to the positive function of the one non-linear channel of the first set of fluid channels. Processes for distributing energy across a reactor are provided. The processes can include transporting reactants via a first set of fluid channels to a second set of fluid channels, and thermally engaging at least one of the first set of fluid channels with at least two of the second set of fluid channels.