Dual-Chamber Expansion Tank Pressure Control in Compact Cooling Loops
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing expansion tanks for liquid cooling systems, particularly in compact designs like those used in fuel cells, struggle to limit maximum pressure while minimizing size and weight, especially when dealing with non-uniform temperature changes in vehicles like aircraft.
Innovation Solution
An expansion tank system with two interconnected chambers, where a control unit manages gas flow between them to maintain a predetermined pressure, using gas conveying devices and a pressure sensor to adjust pressure levels, and optionally includes a deionization filter for coolant purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a large expansion tank is used to limit maximum pressure, then pressure control is improved, but installation space and weight increase
Solution Approach 1:
The expansion tank is divided into two separate chambers: a first chamber for receiving coolant and a second chamber for storing pressurized gas. This segmentation allows the system to achieve pressure control with a smaller overall volume by distributing functions across multiple compartments rather than requiring a single large tank.
Solution Approach 2:
A gas intermediary substance is introduced into the system through the second chamber. This pressurized gas acts as a mediator to control the pressure in the coolant chamber, enabling pressure limitation without requiring the coolant chamber itself to be large, thus resolving the contradiction between pressure control and tank size.
2Stress or pressure
If a large expansion tank is used to limit maximum pressure, then pressure control is improved, but weight increases
Solution Approach 1:
The expansion tank is divided into two separate chambers: a first chamber for receiving coolant and a second chamber for storing pressurized gas. This segmentation allows the system to achieve pressure control with a smaller overall volume by distributing functions across multiple compartments rather than requiring a single large tank.
Solution Approach 2:
A gas intermediary substance is introduced into the system through the second chamber. This pressurized gas acts as a mediator to control the pressure in the coolant chamber, enabling pressure limitation without requiring the coolant chamber itself to be large, thus resolving the contradiction between pressure control and tank size.
3Stress or pressure
If gas is added to control pressure in a compact tank, then pressure control is improved, but device complexity increases
Solution Approach 1:
The system automatically regulates pressure through the interaction between the two chambers and the gas conveying devices. When pressure in the first chamber exceeds the threshold, gas is automatically conveyed to the second chamber; when pressure drops below the threshold, gas is automatically conveyed back to the first chamber. This self-regulating mechanism reduces the need for complex external control systems.
Solution Approach 2:
The pressure control mechanism operates based on feedback from the pressure difference between the two chambers. The gas conveying devices respond to pressure conditions by automatically transferring gas between chambers, creating a closed-loop control system that maintains pressure within the desired range without requiring complex external intervention.
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
This solution allows for a compact and lightweight expansion tank that effectively manages pressure and coolant purity, reducing the risk of high pressures and maintaining a stable coolant loop, even in varying ambient conditions.
Implementation Method 1
the control unit is adapted for controlling the second conveying device to selectively convey gas from the second chamber to the first chamber if a pressure measured through the first pressure sensor is below a predefined first threshold value, and for controlling the first conveying device to selectively convey gas from the first chamber to the second chamber if a pressure measured through the first pressure sensor is above a second threshold value
Implementation Method 2
optionally includes a deionization filter for coolant purification
Data Source
AI summary
An expansion tank system for a liquid cooling system includes a first chamber for receiving a coolant, a second chamber for pressurized gas, a first gas conveying device for conveying gas from the first to the second chamber, a second gas conveying device for conveying gas from the second to the first chamber, a first pressure sensor in fluid communication with the first chamber, and a control unit connected to the first gas conveying device, the second gas conveying device and the first pressure sensor for controlling the second conveying device to selectively convey gas from the second to the first chamber if a pressure measured through the first pressure sensor is below a predefined first threshold value, and for controlling the first conveying device to convey gas from the first to the second chamber if a pressure measured through the first pressure sensor is above a second threshold value.