Three-Phase Flow-Through Heater for Aircraft Beverage Makers
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Solution Overview
Problem
Existing coffee makers for aircraft are unsuitable due to their reliance on single-phase power, fixed cores that hinder maintenance and scale buildup detection, excessive weight from solid metal cores, and inadequate temperature monitoring, posing safety and efficiency concerns.
Innovation Solution
A three-phase flow-through water heater with a removable lightweight baffle core, integrated resistance temperature detectors (RTDs) for direct temperature monitoring, and a custom circuit for efficient power management, utilizing a plasma-sprayed circuit on a stainless steel substrate with PEEK plastic core for reduced weight and improved maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-phase heating element is used, then the heating function is simple and reliable, but it cannot be used with three-phase aircraft power systems
Solution Approach 1:
The patent transforms the heating element from single-phase to three-phase operation by changing the electrical parameters. The heating assembly includes three separate heating circuits, each connected to a different phase of the aircraft's three-phase power system, allowing the device to operate efficiently with aircraft power while maintaining reliable heating function.
2Weight of moving object
If a fixed solid metal core is used, then the structural strength is high, but the weight increases and maintenance becomes difficult
Solution Approach 1:
The heater core is divided into multiple removable segments or sections that can be separated from the housing. This segmentation allows individual sections to be removed for cleaning, inspection, or replacement without dismantling the entire heating assembly, significantly improving maintenance accessibility while using lighter materials.
Solution Approach 2:
The patent employs composite material construction for the heater core, combining lightweight materials with sufficient structural strength. This reduces the overall weight compared to solid metal cores while maintaining the necessary mechanical integrity for aircraft application.
3Stability of the object's composition
If the core is welded into a single piece, then the structural integrity is high, but scale buildup cannot be monitored and maintenance is hindered
Solution Approach 1:
The core is constructed from multiple detachable sections rather than a welded monolithic structure. This allows the sections to be separated for inspection of scale buildup on internal surfaces, while the sections themselves maintain sufficient structural integrity when assembled to ensure proper heating function.
Solution Approach 2:
The removable core design enables preliminary inspection and cleaning actions to be performed before scale buildup significantly impacts heating efficiency. Users can regularly remove and inspect the core sections, detecting scale accumulation early and performing maintenance proactively.
4Reliability
If temperature monitoring is inadequate, then the device complexity is low, but safety concerns and heating inefficiencies arise
Solution Approach 1:
The heating assembly incorporates temperature sensors that provide feedback on the thermal state of the heating element and surrounding components. This feedback mechanism allows the control system to monitor temperature continuously, prevent overheating conditions, and optimize heating efficiency by adjusting power delivery based on actual temperature readings.
Solution Approach 2:
The temperature monitoring system is integrated into the heating assembly itself, with sensors positioned to automatically detect critical temperature conditions without requiring external monitoring equipment. The system self-regulates by using the temperature feedback to control its own operation, ensuring safety while minimizing additional 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
Enables safe and efficient operation with precise temperature control, allows for easy maintenance and scale detection, and reduces weight, addressing the limitations of traditional coffee makers for aircraft use.
Implementation Method 1
Water is pumped through a tubing with a resistive heating element that heats the water as it flows through the tubing. The resistive heating element is typically a coiled wire, similar to the element in an electric toaster, that heats up when electricity is run through it.
Implementation Method 2
plasma-sprayed circuit flow-through heaters from Watlow Electric Manufacturing Company of St. Louis, Mo.
Implementation Method 3
The resistive heating element presses directly against the underside of the warming plate, and white, heat-conductive materials such as grease make sure the heat transfers efficiently.
Implementation Method 4
The one-way valve lets cold water into the aluminum tube, but forces the bubbles of boiling water to flow up the brew tube.
Data Source
AI summary
A water heater for an aircraft beverage brewing apparatus includes a three way electrical conduit for conducting electrical power in three separate phases. The heater has a housing with a fluid inlet port at a first removable end piece and a fluid outlet port at a second removable end piece. The hollow cylindrical core incorporates a heating element wound around the core, and the housing includes three resettable temperature sensors at the outlet, each of the three resettable temperature sensors connected to a separate phase of power from the three way electrical conduit.