Fuel Cell Waste Heat Cabin Floor Heating
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Solution Overview
Problem
Aircraft cabin floors, particularly near galleys and emergency slide storage spaces, experience cold temperatures due to cold bridges formed by doors and storage spaces, and existing heating methods require complex wiring and increase fuel consumption, necessitating an efficient and independent heating solution.
Innovation Solution
A device utilizing a fuel cell to generate waste heat, which is directed through a discharge system to heat sections of the cabin floor, including the galley area and emergency slide storage spaces, using air as the heating fluid and incorporating a cascaded fuel cell system for enhanced efficiency, allowing operation independent of the aircraft's electrical system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heating elements are installed close to escape slides with complex wiring to heat the cabin floor, then the cabin floor temperature is improved, but the device complexity and fuel consumption increase
Solution Approach 1:
The patent replaces the electrical heating system (heating elements with wiring) with a thermal convection system using a fluid circulation loop. The fuel cell heats a fluid (water/antifreeze mixture) which then circulates through tubes embedded in the cabin floor, transferring heat thermally without requiring electrical wiring in the floor structure.
Solution Approach 2:
The patent employs a hydraulic fluid circulation system where a pump drives the heated fluid through a closed-loop network of tubes embedded in the cabin floor. This hydraulic approach enables efficient heat distribution throughout the floor area without the complexity of electrical wiring, while the fluid acts as a mobile heat carrier.
2Temperature
If generators driven by main and auxiliary engines are used to power heating elements, then the escape slide storage spaces are heated, but the fuel consumption increases
Solution Approach 1:
The patent captures and utilizes the waste heat generated by the fuel cell (which would otherwise be dissipated through external coolers) and redirects it through the fluid circulation system to heat the cabin floor and escape slide storage spaces. This converts a harmful waste product (excess heat) into a beneficial resource, eliminating the need for additional fuel consumption.
Solution Approach 2:
The fuel cell system serves multiple functions: generating electrical power for aircraft systems and simultaneously providing thermal energy for cabin heating through waste heat recovery. This multi-functionality eliminates the need for separate heating systems powered by generators, reducing overall fuel consumption.
3Power
If external coolers are used to dissipate waste heat from fuel cells, then the fuel cell operates efficiently, but the waste heat is lost to the environment
Solution Approach 1:
The patent transforms the waste heat that would otherwise be lost to the environment through external coolers into a useful heating resource. The fluid circulation system captures thermal energy from the fuel cell exhaust and redirects it through tubes in the cabin floor, converting energy loss into beneficial cabin and floor heating.
Solution Approach 2:
Instead of discarding the waste heat through external coolers, the system recovers thermal energy from the fuel cell exhaust gases and transfers it to the circulating fluid. This recovery process maintains fuel cell efficiency while preventing energy loss, as the heat is captured and put to productive use.
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 solution efficiently heats the cabin floor sections, improving working conditions for flight attendants and maintaining emergency slides at required temperatures without increasing fuel consumption or requiring complex wiring, while allowing for easy maintenance and refueling outside of airports.
Implementation Method 1
a fluid heated by waste heat from the fuel cell is discharged from the fuel cell and fed to a cavity adjacent to the underside of the cabin floor or located in the cabin floor, so that the section of the cabin floor is heated
Implementation Method 2
the cabin floor can be designed in such a way that the heated air introduced into the escape slide storage space simultaneously causes the cabin floor adjacent to the escape slide storage space to be heated
Data Source
Figure 1~2A
Figure 2B~3B
Figure 4
AI summary
The invention relates to an arrangement for heating a portion of the cabin floor (1) in an aircraft cabin, said cabin floor (1) having an accessible upper face (O) and a lower face (U) which lies opposite the upper face. The arrangement comprises a fuel cell (2) and a discharge device (3) which is connected or can be connected to the fuel cell. A fluid which is heated by the waste heat of the fuel cell (2) is discharged from the fuel cell (2) and conducted to a cavity (4) which adjoins the lower face of the cabin floor (1) or which can be found in the cabin floor such that the portion of the cabin floor (1) is heated.