Isothermalized Mirror Assembly Using Integrated Heat Pipe
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Solution Overview
Problem
Mirror assemblies experience thermal deformations due to heat loads, which existing technologies fail to stabilize effectively, leading to issues like 'quilting' from polishing pressures and atmospheric changes.
Innovation Solution
Integration of a heat pipe or vapor chambers into the mirror structure to isothermalize it, using thermally-convective fluids and capillary media to transfer heat and maintain structural integrity, allowing for lightweight and thermally stable mirror construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional materials with very-low CTE or very-high thermal conductivity are used to make thermally stable mirrors, then thermal stability is improved, but weight increases and manufacturing complexity increases
Solution Approach 1:
The patent uses a composite structure combining a lightweight mirror substrate (such as glass or polymer) with an integrated heat pipe system. The heat pipe contains working fluid and capillary structures that actively transport heat, creating a composite thermal management system that achieves thermal stability without requiring the entire mirror structure to be made from heavy high-conductivity materials like silicon carbide.
Solution Approach 2:
The heat pipe acts as an intermediary thermal management component integrated into the mirror structure. It mediates heat transfer by capturing thermal gradients within the mirror and redistributing heat through phase change and capillary action, thereby stabilizing the mirror surface temperature without requiring the mirror material itself to have extremely high thermal conductivity.
2Stability of the object's composition
If heat pipes are integrated into mirror structure to isothermalize it, then thermal deformations are minimized, but device complexity increases
Solution Approach 1:
The patent merges the heat pipe system directly with the mirror structure by integrating the heat pipe housing, working fluid, and capillary medium into the mirror assembly. This combination eliminates the need for separate thermal management components and reduces overall system complexity despite adding thermal control functionality.
Solution Approach 2:
The heat pipe system is designed to be self-regulating through passive capillary action and phase change mechanisms. The capillary medium automatically draws working fluid from the evaporator to the condenser regions based on thermal gradients, requiring no external power source or active control systems, thereby minimizing operational complexity.
3Temperature
If heat pipes are used to remove heat from localized areas, then thermal gradients are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements local quality by positioning heat pipe components (evaporator, condenser, capillary structures) at specific locations within the mirror assembly where thermal management is most needed. The capillary medium is distributed in regions experiencing highest thermal gradients, allowing targeted thermal control without requiring uniform precision throughout the entire assembly.
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 minimizes thermal deformations and maintains structural stability under varying thermal loads, enabling the construction of lightweight, thermally stable mirror structures suitable for diverse applications, including spacecraft and ground-based telescopes.
Implementation Method 1
a heat pipe or vapor chambers into a mirror structure in order to isothermalize the mirror structure
Implementation Method 2
using thermally-convective fluids and capillary media to transfer heat
Implementation Method 3
using thermally-convective fluids and capillary media to transfer heat
Implementation Method 4
The quantity of thermally-convective fluid 2 is used to transfer heat from a warmer section of the at least one mirror unit 1 to a cooler section of the at least one mirror unit 1
Implementation Method 5
The capillary medium 12 is mounted across the interior surface 112 and a lateral surface 141 for each of the plurality of cross supports 14
Data Source
AI summary
An isothermalized mirror assembly is a mirror structure that uses a heat pipe to isothermalize heat loads. The isothermalized mirror assembly includes at least one mirror unit and a quantity of thermally-convective fluid. The mirror unit includes a vacuum enclosure, a capillary medium, at least one reflector, and a plurality of cross supports. The vacuum enclosure is the structural base of the isothermalized mirror assembly and is used to retain a vacuum and the thermally-convective fluid. The cross supports are mounted within the vacuum enclosure and increases the structural integrity of the vacuum enclosure. The capillary medium is mounted across the interior of the vacuum enclosure and about each cross support. The capillary medium and the thermally-convective fluid work in conjunction to form a heat pipe within the vacuum enclosure. The reflector is externally mounted to the vacuum enclosure in order to redirect EM radiation.