Radiator Thermal Transport Fluid Viscosity Control

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Solution Overview

Problem

Radiator systems in extreme-cold environments face challenges with thermal fluid stagnation and potential freezing due to varying heat loads, which can lead to system failure and safety risks, especially when using toxic or flammable fluids.

Innovation Solution

A radiator system that uses a single-loop design with a thermal transport fluid, such as perfluoropolyether, whose viscosity changes with flow rate to control heat transfer, maintaining fluid flow and reducing thermal conduction, and includes a fluid flow rate controller to balance heat loads, ensuring safe operation in manned environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the radiator system uses a thermal transport fluid with low freezing temperature, then the risk of freezing is reduced, but the fluid becomes toxic and flammable which creates safety risks in manned environments

Engineering Contradiction:

Improvefreezing preventionVSAvoidtoxicity and flammability

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the thermal transport fluid from conventional low-freezing-point fluids (like ethylene glycol or ammonia) to perfluoropolyether compounds. This parameter change maintains adequate freezing protection while eliminating toxicity and flammability, achieving both reliability and safety requirements for manned spaceflight environments.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the radiator system is designed to handle a specific heat load, then stagnation is prevented, but the system cannot adapt when thermal emission needs vary dramatically

Engineering Contradiction:

Improvestagnation preventionVSAvoidheat load variation capability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent implements a variable-speed pump that can dynamically adjust its operation based on thermal emission needs. The pump operates at different speeds to maintain appropriate fluid flow rates across varying heat loads, preventing stagnation during low-emission periods while handling high-emission periods effectively. This dynamic control provides both stagnation prevention and adaptability to varying thermal requirements.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system incorporates temperature sensors and control logic that monitor thermal conditions and provide feedback to the pump controller. This feedback mechanism allows the system to automatically adjust pump speed and fluid flow in response to changing heat loads, ensuring continuous operation above stagnation conditions while adapting to varying thermal emission needs.

Inventive Principle:

Principle #23Feedback

3Use of energy by moving object

If the thermal fluid flow rate is reduced to match low heat loads, then energy efficiency improves, but fluid stagnation and freezing risk increase

Engineering Contradiction:

Improveenergy efficiencyVSAvoidstagnation and freezing prevention

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The variable-speed pump dynamically adjusts fluid flow rate to match thermal emission needs. During low heat load periods, the pump reduces speed to minimize energy consumption while maintaining flow above the stagnation threshold. During high heat load periods, the pump increases speed to handle the higher thermal load. This dynamic adjustment optimizes energy efficiency while continuously preventing stagnation and freezing through automated control.

Inventive Principle:

Principle #15Dynamics

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 system effectively manages varying heat loads, prevents fluid stagnation and freezing, and maintains safe operation by adjusting flow rates and viscosity, ensuring efficient and safe thermal management in extreme-cold conditions.

Implementation Method 1

at least one thermal loop structured and arranged to collect heat from at least one heat source and transport such collected heat

Methodology Applied

Scientific EffectConvection: Convection

Implementation Method 2

thermal conduction from such at least one thermal loop is reduced as such at least one thermal transport fluid becomes locally more viscous

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 3

at least one heat radiator structured and arranged to radiate such collected heat transported by such at least one thermal loop

Methodology Applied

Scientific EffectThermal radiation: Thermal Radiation

Implementation Method 4

wherein such at least one thermal transport fluid comprises at least one organo-flourine; wherein, when such at least one thermal transport fluid becomes locally more viscous, the locally more viscous fluid becomes more thermally insulative

Methodology Applied

Scientific EffectViscosity change with temperature:

Data Source

PatentUS9109843B1Radiator systems

Publication Date: 2015.08.18 PARAGON SPACE DEVELOPMENT CORP

AI summary

Radiator systems utilizing controlling features for shutdown and restart for varying heat load applications.