Thermal control systems for reducing ice formation
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Solution Overview
Problem
Thermal control systems in extreme environments, such as space vehicles, face issues with ice formation in fluid loops due to water vapor permeation and freezing, which can lead to reduced efficiency and performance by blocking filters and disrupting heat transfer.
Innovation Solution
Incorporating an anti-icing fluid, like ethanol, which is immiscible with the heat transfer fluid but miscible with water, to maintain a mixture that remains liquid at extreme temperatures, preventing ice formation and ensuring fluid loop functionality even at temperatures below -120 degrees Fahrenheit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermal control system uses a fluid loop with water-based heat transfer fluid in extreme cold environments, then effective heat transfer can be achieved, but ice formation occurs that blocks filters and disrupts heat transfer
Solution Approach 1:
The patent changes the chemical composition parameter of the heat transfer fluid by adding alcohol (e.g., ethanol, isopropanol) to the water-based fluid, transforming it into an anti-freeze solution that maintains liquid state at extreme temperatures below -120°F, thereby preventing ice formation while preserving heat transfer capability
Solution Approach 2:
The patent creates a composite heat transfer fluid by combining water with alcohol additives, forming a heterogeneous mixture that leverages the high heat capacity of water and the low-temperature fluidity of alcohol, achieving both effective heat transfer and ice prevention in extreme cold environments
2Temperature
If the thermal control system operates at temperatures below -120 degrees Fahrenheit, then extreme temperature control is achieved, but the heat transfer fluid freezes and reduces system efficiency
Solution Approach 1:
The patent modifies the freezing point parameter of the heat transfer fluid by incorporating alcohol additives, enabling the fluid to remain liquid at temperatures below -120°F, thus maintaining fluid loop functionality and system reliability in extreme cold conditions
3Productivity
If water vapor permeation occurs in the fluid loop, then thermal control operation continues, but ice crystals form and block filters
Solution Approach 1:
The patent changes the phase transition temperature parameter of the heat transfer fluid by adding alcohol, ensuring that even when water vapor permeates into the fluid loop, the resulting mixture remains below its freezing point and prevents ice crystal formation that would block filters and disrupt continuous 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 use of an anti-icing fluid effectively prevents ice crystal formation, maintaining the thermal control system's efficiency and performance by keeping the mixture liquid at extreme temperatures, thus ensuring continuous operation in space applications.
Implementation Method 1
The anti-icing fluid is immiscible with the heat transfer fluid and is miscible with water to form a mixture that remains liquid at temperatures under use conditions in space
Implementation Method 2
a thermal control system for transferring thermal energy between the first component and the second component
Implementation Method 3
a pump for circulating the heat transfer fluid and the anti-icing fluid within the fluid loop
Data Source
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AI summary
The present disclosure provides examples of thermal control systems for reducing ice formation. In one example, a space vehicle (301) comprising a first component (304), a second component (306), and a thermal control system (300) is provided. The thermal control system is configured for transferring thermal energy between the first component and the second component. The thermal control system comprises a fluid loop in thermal communication with the first component and the second component, a heat transfer fluid including a perfluoropolyether, an anti-icing fluid, wherein the anti-icing fluid is immiscible with the heat transfer fluid and is miscible with water to form a mixture that remains liquid at temperatures under use conditions in space, and a pump (310) for circulating the heat transfer fluid and the anti-icing fluid within the fluid loop.