Expendable Heat Sink Control for Lightweight Peak Cooling
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Solution Overview
Problem
Aircraft components such as propeller motors and batteries generate excessive heat during operation, risking overheating and potential damage, and existing thermal management systems are inefficient in handling peak heat loads without increasing component size and weight.
Innovation Solution
A cooling system utilizing expendable media that includes a supplemental coolant path with a high-specific heat capacity coolant, diverting it to a liquid-to-liquid heat exchanger during peak loads to cool a primary coolant, and venting it to ambient or air-to-liquid exchanger as needed, allowing components to be designed for normal operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional cooling systems are designed to handle peak heat loads, then thermal management capability is improved, but component size and weight increase
Solution Approach 1:
The patent introduces a second coolant as an intermediary substance with higher specific heat capacity to transfer heat from the first coolant to ambient air. This mediator enables peak heat load management without requiring the primary cooling components to be oversized, thus resolving the contradiction between thermal management capability and system weight
Solution Approach 2:
The patent changes the thermal parameter (specific heat capacity) by introducing a second coolant with superior heat absorption properties. This parameter change allows the system to handle peak loads more efficiently without increasing component size or weight
2Reliability
If components are designed to handle peak thermal loads, then thermal safety is improved, but component complexity increases
Solution Approach 1:
The patent segments the cooling function into two distinct parts: a primary coolant loop for continuous operation and a secondary coolant system activated only during peak loads. This segmentation allows each subsystem to be optimized independently, maintaining thermal safety without requiring the entire system to be designed for maximum capacity
Solution Approach 2:
The patent implements a dynamic cooling system where the second coolant is selectively activated based on thermal demand. The system transitions from a static design handling all loads to a dynamic system that adapts cooling capacity to actual needs, improving reliability without proportional increases in complexity
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 peak heat loads without increasing component size or weight, ensuring safe operation by using expendable media to handle excessive thermal demands.
Implementation Method 1
the first type of coolant is diverted to a liquid-to-liquid heat exchanger at which the first type of coolant is cooled by a second type of coolant
Implementation Method 2
The first type of coolant is cooled at an air-to-liquid heat exchanger
Implementation Method 3
a second type of coolant having a greater specific heat capacity
Data Source
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AI summary
A cooling system includes a main coolant loop through which a first type of coolant (e.g., water or glycol) circulates to cool a heat load. During normal operation, cooling of the first type of coolant is performed by a heat exchanger using ambient or ram air. During peak loads, however, cooling of the first type of coolant is supplemental using an expendable coolant (e.g., supercritical carbon dioxide, liquid helium, liquid nitrogen, etc.). The expendable coolant can be vented from the cooling system after use in cooling the first type of coolant.