Dual Condenser Loop Heat Pipe for Satellite Thermal Management
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Solution Overview
Problem
Conventional thermal control systems for spacecraft do not effectively reject heat from the east and west-facing surfaces due to direct sunlight, limiting thermal efficiency.
Innovation Solution
A dual condenser loop heat pipe system with sun-normal radiators that utilizes east-west panels and fluidic-valve-controlled segmentation of coolant flow between panels, allowing heat rejection from either radiator, whichever is cooler, and includes flexible tubing for assembly and partial operation during shading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional thermal control systems are used, then heat can be rejected from north and south facing surfaces, but heat rejection from east and west facing surfaces is limited due to direct sunlight
Solution Approach 1:
The thermal control system is divided into separate north-south and east-west facing radiator panels with independent heat pipe loops. This segmentation allows each panel type to be optimized for its specific thermal environment, enabling heat rejection from all four cardinal directions simultaneously
Solution Approach 2:
Heat pipe technology serves as an intermediary mechanism between the electronic equipment heat sources and the radiator panels. The heat pipes efficiently transfer heat from the equipment to both north-south and east-west facing radiators, overcoming the limitation of direct solar radiation on east-west surfaces by using thermal conduction through the heat pipe working fluid
2Productivity
If heat rejection from east and west surfaces is enabled, then thermal efficiency is improved, but system complexity increases
Solution Approach 1:
The heat pipe technology provides a universal heat transfer mechanism that works effectively in both north-south and east-west oriented radiator panels. This multi-functional approach allows the same fundamental technology to serve multiple thermal rejection pathways, improving thermal efficiency without proportionally increasing system complexity
Solution Approach 2:
The system merges the heat rejection functions of north-south and east-west facing surfaces into a unified thermal control architecture. By combining multiple radiator panels and heat pipe loops into an integrated system, the satellite achieves comprehensive heat rejection from all surfaces while managing complexity through systematic design
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
Enhances thermal efficiency by enabling heat rejection from east and west surfaces, improving payload capacity and reducing required heater power, while maintaining low operating temperatures and small diurnal temperature variations.
Implementation Method 1
dual condenser loop heat pipes for satellites
Implementation Method 2
heat generated from on-board electronics to be rejected
Implementation Method 3
radiator panels disposed at the respective faces
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 3A~3C
AI summary
Systems, methods, and apparatus for dual condenser loop heat pipes for satellites with sun-normal radiators are disclosed. In one or more embodiments, a disclosed method for a satellite thermal management system comprises heating, in an evaporator, a liquid to convert the liquid to a vapor. The method further comprises passively circulating within tubing, from the evaporator, the vapor to a first radiator not illuminated by a sun and to a second radiator illuminated by the sun. Also, the method comprises converting the vapor to the liquid when the vapor is within the first radiator not illuminated by the sun. Further, the method comprises passively circulating within the tubing, from the first radiator not illuminated by the sun, the liquid to the evaporator.