Spacecraft Radiator Panel Curved Geometry Thermal Management
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Solution Overview
Problem
Conventional spacecraft radiators on non-North or South-facing surfaces experience varying solar radiation, leading to impaired efficiency and significant diurnal temperature gradient cycles, which limits heat dissipation capacity.
Innovation Solution
The implementation of radiator panels with specific geometries and thermal coupling mechanisms, such as curved or multi-faceted designs, and the use of heatpipes and spreader heatsinks to distribute heat evenly across the radiator surfaces, mitigating diurnal temperature variations by ensuring consistent solar exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If radiator panels are placed on non-north/south facing surfaces to increase heat dissipation capacity, then the total heat rejection capacity is improved, but the efficiency is impaired due to varying solar radiation exposure
Solution Approach 1:
The patent applies curved or multi-faceted radiator panel geometries instead of flat planar surfaces. The curved surfaces are designed to rotate with the spacecraft, presenting an optimized angle to solar radiation throughout the day, thereby maintaining consistent thermal performance regardless of the panel's nominal facing direction.
Solution Approach 2:
The radiator panels are designed to dynamically rotate along with the spacecraft's orientation changes. This dynamic adjustment ensures that the panels continuously optimize their solar exposure angle, converting the static disadvantage of non-north/south facing into a dynamic solution that maintains efficiency throughout the orbital cycle.
2Device complexity
If conventional planar radiator surfaces are used on non-north/south walls, then the device complexity is reduced, but significant diurnal temperature gradient cycles occur
Solution Approach 1:
The curved or multi-faceted geometry distributes solar exposure more evenly across the radiator surface throughout the day. This geometric design reduces the amplitude of temperature fluctuations by ensuring that no single area experiences extreme peak or minimum exposure, thereby mitigating diurnal temperature gradients while maintaining structural feasibility.
Solution Approach 2:
Different portions of the curved or multi-faceted radiator surface are designed with specific orientations to optimize local thermal performance. Each facet or section contributes differently to the overall heat rejection, with local variations in surface orientation that collectively reduce temperature gradients across the entire radiator assembly.
3Power
If heat is concentrated on specific radiator areas, then the heat transfer rate is improved, but thermal variations create large diurnal temperature gradient cycles
Solution Approach 1:
The patent employs spreading heatpipes and internal heat transfer mechanisms that distribute heat laterally across the radiator panel surface. This creates a more uniform heat flux distribution, preventing localized hot spots while maintaining high overall heat transfer rates. The combination of concentrated heat input with distributed heat delivery reduces temperature gradients.
Solution Approach 2:
Spreading heatpipes act as intermediary thermal conduction paths between the heat dissipation units and the radiator surface. These heatpipes laterally transport heat across the panel, equilibrating temperature differences and reducing gradients while preserving the high heat transfer capability to space.
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 approach enhances the heat rejection efficiency of non-north/south radiators by maintaining a more benign temperature environment, reducing inefficiencies caused by diurnal temperature gradients and increasing the spacecraft's overall heat dissipation capacity.
Implementation Method 1
the use of heatpipes and spreader heatsinks to distribute heat evenly across the radiator surfaces
Implementation Method 2
heat rejection is achievable by thermal radiation. Therefore, such a spacecraft typically includes an arrangement of externally facing radiator panels that radiate excess heat from the spacecraft into space
Data Source
AI summary
Techniques for minimizing diurnal temperature variation of a radiator of a spacecraft are disclosed. In one aspect, a spacecraft includes a body, a radiator panel, and a heat dissipating unit thermally coupled with the radiator panel. The spacecraft is configured to operate in an orbital plane, and has a yaw axis within the orbital plane and directed from a spacecraft coordinate system origin toward nadir, a pitch axis orthogonal to the orbital plane, and a roll axis orthogonal to the pitch axis and the yaw axis. The radiator panel includes a surface area external to a body of the spacecraft, a first portion of the surface area facing a first direction that is substantially parallel to the roll axis, and a second portion of the surface area facing a second direction that has a substantial component parallel to the yaw axis.