Staged Heat Pump Cooling Loop for Lower-Weight Aircraft Thermal Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current aircraft thermal management systems are inefficient due to the use of nonintegrated, standalone vapor cycle units that require significant weight and power, leading to increased aircraft weight and decreased efficiency.
Innovation Solution
A thermal management system comprising a fluid loop connected to multiple heat pump units that distribute heating or cooling between climate-controlled regions, allowing for staged climate control and reducing the amount of fluid needed, thereby minimizing weight and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple standalone vapor cycle units are used to provide cooling to different regions, then each region receives dedicated cooling, but the overall system weight and power requirements increase significantly
Solution Approach 1:
The patent combines multiple standalone vapor cycle units into a single centralized cooling system that serves multiple regions. The centralized system includes one compressor, one condenser, one expansion device, and one evaporator that provides cooling to multiple regions through a shared refrigerant distribution network, thereby reducing overall system weight while maintaining dedicated cooling capability.
Solution Approach 2:
The centralized cooling system is designed to perform multiple functions by serving different regions simultaneously. The single refrigerant circulation system can provide cooling to multiple regions through controllable refrigerant distribution, making the system universal rather than region-specific.
2Device complexity
If a centralized vapor cycle unit cools refrigerant at one location and distributes it throughout the aircraft, then the number of units is reduced, but the unit size, weight, and refrigerant quantity increase
Solution Approach 1:
The patent segments the cooling function across multiple distributed heat pump units rather than using one large centralized unit. Each heat pump unit is smaller and can be distributed to different regions or locations, reducing the weight concentration at any single location while maintaining the ability to serve multiple regions.
3Temperature
If standalone vapor cycle units are used for each region, then temperature control is provided to each region, but aircraft efficiency decreases due to increased weight
Solution Approach 1:
The patent merges multiple region-specific cooling systems into a single integrated thermal management system that maintains temperature control for each region while reducing overall system weight. The integrated system shares common components (compressor, condenser, expansion device, evaporator) across regions, thereby improving aircraft efficiency while preserving individual region temperature control capability.
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 achieves a more constant supply temperature across climate-controlled regions, reduces the total fluid required, and allows for smaller, easier-to-install heat pump units, resulting in improved aircraft efficiency and reduced weight.
Implementation Method 1
The refrigerant within the evaporator absorbs heat from the surrounding environment
Implementation Method 2
The refrigerant from the condenser is regulated through an expansion valve to an evaporator where the refrigerant expands to cool the fluid
Implementation Method 3
the condenser, which rejects heat from the compressed refrigerant to the surrounding environment
Data Source
AI summary
A thermal management system comprises a first heat exchanger having an inlet and an outlet, a second heat exchanger having an inlet and an outlet, a fluid loop, a first heat pump, and a second heat pump. The fluid loop circulates a fluid, and forms a continuous path between the first and second heat exchangers. The first heat pump is connected to the fluid loop and is disposed between the outlet of the second heat exchanger and the inlet of the first heat exchanger. The second heat pump is connected to the fluid loop and is disposed between the outlet of the first heat exchanger and the inlet of the second heat exchanger.