Photoreactor Dome Wall Cavities Fresnel Reflection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing photoreactor systems suffer from inefficiencies in light usage and heat generation due to Fresnel reflection and absorption, leading to reduced performance and unwanted by-products in photochemical reactions.
Innovation Solution
A photoreactor assembly with a light source arrangement where light sources are configured within wall cavities of a dome-like shape, minimizing Fresnel reflections and ensuring that most light is directed towards the reactor fluid, with transmissive reactor walls and a reflector element to optimize light usage and reduce heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light sources are placed outside the reactor with conventional flat geometry, then the structure is simple, but Fresnel reflection causes significant light loss and reduced efficiency
Solution Approach 1:
The reactor wall is designed with a curved geometry (dome-like structure) instead of a flat surface. This curvature ensures that light rays incident on the wall do so at oblique angles, minimizing Fresnel reflection losses and maximizing light transmission into the reactor. The curved surface redirects reflected light back toward the light source or toward the reaction zone, thereby reducing energy loss while maintaining structural feasibility.
2Productivity
If light sources are placed close to the reactor fluid, then light usage efficiency increases, but heat generation becomes excessive and causes unwanted by-products
Solution Approach 1:
The reactor is divided into distinct functional zones: a light source arrangement zone, a reaction zone where fluid is treated, and a heat dissipation zone. By segmenting the reactor structure and positioning light sources at an optimized distance rather than direct contact, the design achieves high light efficiency while preventing excessive heat buildup in the reaction zone, thus avoiding thermal side reactions and unwanted by-products.
3Ease of manufacture
If conventional flat reactor walls are used, then manufacturing is simple, but light reflection leads to multiple reflections and efficiency loss
Solution Approach 1:
The reactor incorporates curved walls with a dome-like geometry that redirects light reflections. Instead of flat surfaces causing multiple random reflections and energy loss, the curved walls systematically redirect light toward the reaction zone, maintaining manufacturing feasibility while significantly improving light utilization efficiency and reducing the number of ineffective reflections.
4Device complexity
If a substantial proportion of light radiation is unused or lost, then the system is simpler to design, but performance and efficiency are reduced
Solution Approach 1:
By implementing curved reactor walls with optimized geometry, the system captures and redirects light that would otherwise be lost through Fresnel reflection. This geometric modification, rather than adding complex optical components, maintains relative design simplicity while dramatically improving light utilization efficiency and photochemical reaction performance.
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 solution significantly increases the efficiency of light usage in photochemical reactions, reducing heat generation and enhancing the yield of desired products by ensuring that a vast majority of light source radiation interacts with the reactor fluid, thereby improving the overall performance of the photoreactor system.
Implementation Method 1
a substantial proportion of the light source radiation may be unused, i.e., it does not interact with reagents/fluid in the reactor, but may instead leave the system, may be lost due to Fresnel reflection and/or may be absorbed by other elements in the system
Implementation Method 2
at least one of the one or more reactor walls is transmissive for the light source radiation
Implementation Method 3
commonly used light sources in photochemistry may include low or medium pressure mercury lamps or fluorescent lamps. In addition to that, some reactions may require a very specific wavelength region
Implementation Method 4
Photochemical processing or photochemistry relates to the chemical effect of light. More in general photochemistry refers to a (chemical) reaction caused by absorption of light, especially ultraviolet light (radiation), visible light (radiation) and/or infrared radiation (light)
Implementation Method 5
the light source radiation may be absorbed, which may result in excessive heat being produced in the photoreactor assembly
Data Source
AI summary
The invention provides a photoreactor assembly (1000) comprising a reactor (200) and a light source arrangement (1010): wherein: the light source arrangement (1010) comprises a plurality of light sources (10) configured to generate light source radiation (11) selected from one or more of UV radiation, visible radiation, and IR radiation, wherein each light source (10) comprises a light emitting surface (12): the reactor (200) is configured for hosting a fluid (5) to be treated with the light source radiation (11), wherein the reactor (200) comprises one or more reactor walls (210), wherein at least one of the one or more reactor walls (210) defines wall cavities (220) and is configured in a radiation receiving relationship with the plurality of light sources (10); wherein the at least one of the one or more reactor walls (210) is transmissive for the light source radiation (11); wherein one or more of the light sources (10) are at least partly configured in the wall cavities (220) whereby the light emitting surfaces (12) are within the wall cavities (220) and the at least one of the one or more reactor walls (210) at least partly encloses the light emitting surfaces (12).