Absorbent Dome for Radiating Collector Thermal Management
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Solution Overview
Problem
Existing thermal dissipation systems for satellites, particularly those with radiating collector tubes, face inefficiencies in heat management, leading to high temperatures that can damage materials and limit payload power and RF performance, with limited adjustment parameters and increased wave guide lengths.
Innovation Solution
A thermal monitoring device with an absorbent screen having high solar absorptivity and low infrared emissivity, coupled with a high emissivity surface for heat re-emission, is placed between radiating collectors and the satellite wall, reducing solar radiation reflection and infrared re-emission, and utilizing a heat transport mechanism like a fluid loop to manage heat effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional radiating collectors are used without thermal monitoring devices, then the satellite structure is simpler and lighter, but the radiating collector temperatures become excessively high (up to 220°C) causing material damage and limiting payload power
Solution Approach 1:
An absorbent screen is introduced as an intermediary element between the radiating collector and the satellite wall. This screen absorbs solar radiation and re-emits it in the infrared spectrum, preventing direct solar heating of the radiating collector while maintaining radiative cooling functionality. The screen acts as a thermal mediator that decouples the harmful solar radiation from the sensitive radiating collector surface.
Solution Approach 2:
The invention changes the thermal parameters of the radiating collector system by introducing a screen with specific optical properties (high solar absorptivity, low infrared emissivity on the outer surface; high infrared emissivity on the inner surface). This parameter change transforms the thermal interaction between solar radiation and the radiating collector, reducing peak temperatures while preserving the radiative cooling mechanism.
2Productivity
If radiating collector tubes are placed on east/west edges to maximize radiation view factor, then cooling efficiency improves, but wave guide lengths increase and payload layout flexibility decreases
Solution Approach 1:
The invention converts the harmful effect of solar radiation heating the radiating collector into a beneficial effect by using the absorbent screen to capture solar energy and re-emit it as infrared radiation. This allows radiating collectors to be placed in positions that would otherwise be too hot, thereby reducing wave guide lengths and improving payload layout flexibility without sacrificing cooling efficiency.
3Power
If radiating collectors operate at high temperatures to maximize heat dissipation, then payload power capacity increases, but thermal stress on materials increases and reliability decreases
Solution Approach 1:
The absorbent screen provides preliminary protection against solar radiation heating before the radiation reaches the radiating collector. By blocking and re-emitting solar radiation in a controlled manner, the screen prevents excessive temperature rise that would cause material damage, thereby maintaining system reliability while allowing high power operation.
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 effectively reduces radiator temperatures by 10-20°C, allowing for more flexible accommodation of radiating collector tubes, optimizing payload layout, and reducing thermal stress without modifying mechanical integrity, while being cost-effective and lightweight.
Implementation Method 1
an absorbent surface with the largest possible absorptivity αSOLAR in the field of solar radiation
Implementation Method 2
At least a second emission surface with a high emissivity εIR in the infrared spectrum, radiating toward the outside of the craft
Implementation Method 3
Means for heat transport between the absorbent surface and the emission surfaces
Implementation Method 4
utilizing a heat transport mechanism like a fluid loop to manage heat effectively
Data Source
AI summary
A device for thermal monitoring a piece of equipment, which is integrated on a craft placed in a forced vacuum environment, an outside part of the equipment projecting outside of a wall of the craft and being subjected to a solar radiation flux, includes an absorbent screen that is suitable for being placed between the outside part of the equipment and the wall of the craft, whereby this absorbent screen has—on at least one portion of its front face, designed to be placed on the side removed from the wall of the craft—an absorptivity αSOLAR that is the largest possible in the field of solar radiation, coupled to a low emissivity εIR in the infrared spectrum. The absorbent screen is made of a very heat-conductive material and has—on at least a portion of its rear face, suitable for being oriented toward the wall of the craft—a high emissivity εIR in the infrared spectrum, typically greater than or equal to 0.7.