Heat Exchanger With Intermediate Fluid Barrier
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Solution Overview
Problem
Existing heat exchangers in gas turbine engines pose hazards due to potential intermixing of fuel and compressed air in case of failure, leading to risks of fire or contamination.
Innovation Solution
A heat exchanger design with isolated conduits for fuel and compressed air, utilizing an intermediate fluid at lower pressure to transfer heat while preventing intermixing, equipped with sensors and valves to monitor and control fluid flow, and a one-way valve to ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a direct heat exchanger design is used to transfer heat between fuel and compressed air, then heat exchange efficiency is improved, but the risk of intermixing and fire hazard increases
Solution Approach 1:
The patent introduces an intermediate fluid as a mediator between fuel and compressed air. This intermediate fluid receives heat from the fuel and transfers it to the compressed air, enabling heat exchange while physically preventing direct contact between the two fluids, thus eliminating fire hazard while maintaining thermal efficiency.
Solution Approach 2:
The heat exchanger is divided into three separate conduit systems: a first conduit for fuel, a second conduit for compressed air, and a third conduit for intermediate fluid. This segmentation physically isolates the combustible fuel from the compressed air, allowing heat exchange through the intermediate fluid without creating fire hazards.
2Reliability
If pressure equalization is used to prevent leaks, then system reliability is improved, but the ability to detect leaks deteriorates
Solution Approach 1:
The patent deliberately maintains a pressure difference parameter between the intermediate fluid and the fuel/compressed air. The intermediate fluid is kept at a lower pressure, which creates a detectable pressure gradient. This parameter change enables leak detection through pressure sensors while still providing reliable operation through the pressure differential.
Solution Approach 2:
The patent incorporates pressure sensors that continuously monitor the pressure of the intermediate fluid and provide feedback to the control system. This feedback mechanism enables real-time leak detection by comparing actual pressure readings against expected values, allowing immediate detection of any breaches in the system.
3Object-affected harmful factors
If isolation measures are implemented to prevent intermixing, then safety is improved, but device complexity increases
Solution Approach 1:
The intermediate fluid serves as a simple yet effective isolation barrier between fuel and compressed air. Rather than implementing complex mechanical seals or valves, the system uses the intermediate fluid as a passive mediator that naturally prevents intermixing, achieving safety without excessive complexity.
Solution Approach 2:
The patent uses fluid pressure differentials to achieve isolation and prevent intermixing. By maintaining the intermediate fluid at a lower pressure than both the fuel and compressed air, the system creates natural pressure barriers that prevent leakage and contamination, utilizing pneumatic principles to simplify the isolation mechanism.
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
Prevents intermixing of fuel and compressed air, ensuring safety by detecting leaks and maintaining system integrity, thereby avoiding contamination and hazardous conditions.
Implementation Method 1
the third conduit is for carrying a flow of an intermediate fluid between the first and second units so as to transfer heat between the first fluid and the second fluid
Data Source
AI summary
The invention relates to a heat exchanger 10, comprising: a first unit 12 having a first conduit 16 for passing a flow of a first fluid through the first unit 12; a second unit 14 having a second conduit 28 for passing a flow of a second fluid through the second unit 28, wherein the flow of the first fluid is isolated from the second unit 14 and the flow of the second fluid is isolated from the first unit 12; and, a third conduit 40 connecting the first 12 and second 14 units, wherein the third conduit 40 is for carrying a flow of an intermediate fluid between the first 12 and second 14 units so as to transfer heat between the first fluid and the second fluid, when in use.