Parallel Ram Heat Exchanger Recirculation System
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Solution Overview
Problem
Current aircraft air conditioning systems require high engine pressures for cabin pressurization and cooling, leading to inefficient engine fuel burn due to the reliance on high-pressure air bleeds.
Innovation Solution
A system that utilizes a medium bled from a low-pressure engine location, flowing through heat exchangers in parallel to reduce temperature and pressure, with a compressing device bypassed to maintain efficient fuel burn, incorporating recirculation and ram air cooling to supply pressurized air to the cabin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-pressure air bleed is used from the engine, then cabin pressurization and cooling is achieved, but engine fuel burn efficiency deteriorates
Solution Approach 1:
The system divides the air flow into multiple parallel paths through a plurality of heat exchangers, allowing the medium to be cooled incrementally at different stages rather than requiring a single high-pressure extraction point
Solution Approach 2:
The system changes the pressure parameter by bleeding air from a low-pressure location of the engine instead of a high-pressure location, and uses variable geometry to control the flow distribution across parallel heat exchanger paths to achieve desired cooling at lower pressure ratios
2Temperature
If medium flows through heat exchangers in parallel, then temperature reduction efficiency is improved, but system complexity increases
Solution Approach 1:
The cooling function is segmented into multiple parallel heat exchanger units, each handling a portion of the medium flow, which distributes the thermal load and improves overall temperature reduction efficiency
Solution Approach 2:
The parallel heat exchanger configuration serves multiple functions simultaneously: cooling the medium, managing pressure distribution, and providing redundant cooling paths, thereby improving temperature efficiency without proportionally increasing 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
This approach reduces engine fuel burn by using lower initial pressures while maintaining effective cabin pressurization and cooling, achieving high efficiency in environmental control systems for aircraft.
Implementation Method 1
a first temperature of the medium at the valve being reduced when the medium flows across the first heat exchanger and the second heat exchanger in parallel to a second temperature
Implementation Method 2
a recirculation bleed line fluidly coupled between the chamber and the inlet line
Data Source
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AI summary
A system includes an inlet line (102) configured to receive a medium flowing from a low-pressure location of an engine to a chamber (104), a plurality of heat exchangers (110,120) configured to receive the medium from the inlet line (102), and a valve (106) located upstream from the plurality of heat exchangers (110,120). The valve (106) is configured to divide in parallel the medium across at least a first heat exchanger (110) and a second heat exchanger (120) of the plurality of heat exchangers. A recirculation air system (400) is configured to supply a recirculation air from the chamber (104) to the inlet line (102) upstream of the heat exchangers (110,120).