Integrated Aircraft Air Conditioning With Liquid-Loop Pre-Cooling
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Solution Overview
Problem
Aircraft air conditioning systems with nonintegrated cooling systems are inefficient due to significant weight and power requirements, affecting overall aircraft efficiency.
Innovation Solution
An air conditioning system integrating a vapor compression cycle with an air cycle system through a liquid loop, where a first liquid is cooled by a second liquid and/or medium, with cooling controlled by ambient air temperature and second liquid cooling capacity, and medium flow adjusted to maintain desired temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If nonintegrated cooling systems are used in aircraft, then temperature control can be provided to various regions, but weight and power requirements increase significantly
Solution Approach 1:
The patent combines a vapor compression cycle system with an air cycle system into an integrated architecture. The vapor compression system provides efficient cooling for equipment and cargo holds, while the air cycle system handles cabin conditioning. Both systems share common components including heat exchangers, liquid loops, and control mechanisms, thereby reducing overall system weight while maintaining the ability to provide temperature control to multiple regions simultaneously
2Adaptability or versatility
If nonintegrated cooling systems are used in aircraft, then temperature control can be provided to various regions, but power requirements increase significantly
Solution Approach 1:
The integrated system merges vapor compression and air cycle systems to optimize power distribution. The vapor compression system uses an electrically-driven compressor for high-efficiency cooling of equipment and cargo, while the air cycle system uses turbine expansion for cabin conditioning. By sharing common infrastructure and optimizing compressor operation, the system reduces total power consumption compared to separate nonintegrated systems
Solution Approach 2:
The system dynamically adjusts operating parameters including refrigerant flow rates, compressor speed, and heat exchanger configurations to optimize power consumption. The controller monitors system conditions and modifies operational parameters in real-time to minimize power requirements while maintaining desired temperature control across all regions
3Productivity
If first liquid is cooled by second liquid in liquid loop, then cooling capacity is optimized, but system complexity increases
Solution Approach 1:
The patent introduces a liquid loop system with heat exchangers as an intermediary between the vapor compression system and the environment. The first liquid circulates through the heat exchanger where it is cooled by the second liquid, enabling efficient heat transfer and optimized cooling capacity. This intermediary liquid loop architecture manages complexity by providing a controlled thermal management pathway while maintaining system modularity
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
Enhances system efficiency by optimizing cooling capacity and reducing thermal limitations, achieving a coefficient of performance of 3 or better, while maintaining fuel temperature below maximum operating levels.
Implementation Method 1
The first liquid is arranged in a heat transfer relationship with a second liquid at the heat exchanger. The first liquid is cooled by the second liquid and/or the medium
Implementation Method 2
The liquid loop is thermally and fluidly connected to the air cycle system at the at least one air cycle system heat exchanger
Implementation Method 3
The vapor compression cycle includes a condenser and an evaporator
Implementation Method 4
The vapor compression cycle includes a condenser and an evaporator
Data Source
AI summary
An air conditioning system of a vehicle includes an air cycle system configured to receive a medium and provide a conditioned form of the medium to one or more loads. A vapor compression cycle has a closed loop configuration and a liquid loop through which a first liquid circulates is thermally and fluidly connected to the vapor compression cycle. The liquid loop is also thermally and fluidly connected to the air cycle system at an air cycle system heat exchanger. The liquid loop includes a heat exchanger arranged upstream from the air cycle system heat exchanger relative to a flow of the first liquid. The first liquid is arranged in a heat transfer relationship with a second liquid at the heat exchanger. The first liquid is cooled by the second liquid and/or the medium to achieve a desired temperature at a location downstream from the air cycle system heat exchanger.