Fluidtight Fire Door Thermal Insulation Segmentation
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Solution Overview
Problem
Current fluidtight fire doors in high-security buildings, such as nuclear power plants, fail to effectively prevent excessive temperature rises on the unexposed side during fire exposure, violating thermal insulation standards.
Innovation Solution
A pivoting fire door design featuring a metal framework surrounding an empty space filled with thermal insulation between two layers, which prevents heat radiation transfer between broad faces, and optionally includes a thermal break and water-retentive insulating materials to manage temperature and maintain tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional thermal insulation structures are used in fire doors, then the door structure is relatively simple, but excessive temperature rises occur on the unexposed side during fire exposure, violating thermal insulation standards
Solution Approach 1:
The thermal insulation system is segmented into three distinct layers: a first thermal insulation layer on the exposed side, a second thermal insulation layer on the unexposed side, and a middle layer containing heat-absorbing material positioned between them. This segmentation allows each layer to perform its specific function optimally, preventing excessive temperature transmission while maintaining structural organization.
Solution Approach 2:
Different regions of the door are assigned different material properties tailored to their specific functional requirements. The heat-absorbing material is strategically positioned in the middle layer where it can most effectively intercept and absorb thermal energy before it reaches the unexposed side, creating localized thermal management zones.
2Temperature
If thick thermal insulation layers are used to prevent heat transmission, then thermal insulation performance improves, but the door weight and size increase significantly
Solution Approach 1:
The invention changes the thermal properties of the door by incorporating materials with specific heat absorption characteristics in the middle layer. This allows for thinner overall insulation layers while achieving the same thermal protection, as the heat-absorbing material actively manages thermal energy rather than relying solely on thermal resistance thickness.
Solution Approach 2:
The door employs a composite thermal insulation structure combining different types of insulation materials with a heat-absorbing material layer in between. This composite approach leverages the complementary strengths of each material type to achieve superior thermal performance with reduced overall thickness and weight compared to single-material thick insulation.
3Strength
If metal framework is used to ensure structural strength, then mechanical stability is maintained, but heat conduction from exposed side to unexposed side increases
Solution Approach 1:
The heat-absorbing material layer acts as an intermediary between the metal framework on the exposed side and the unexposed side. It intercepts and absorbs thermal energy conducted through the metal framework, preventing direct heat transmission and protecting the unexposed side while the metal framework maintains its structural function.
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 door effectively limits temperature rises on the unexposed side to meet stringent regulations, including the European ELI standard of 180°C, while maintaining high tightness against fluids, including water pressure.
Implementation Method 1
said layers being capable of preventing, in the event of one of the said broad faces being exposed to fire, the propagation of heat radiation from the latter to the other of the said broad faces
Implementation Method 2
limiting its transmission, consequently limiting high heat transfer, by propagation, radiation, or conduction
Implementation Method 3
limiting its transmission, consequently limiting high heat transfer, by propagation, radiation, or conduction
Data Source
AI summary
The subject of the present invention is a watertight fire door for closing an opening in a building or edifice comprising, on the one hand, a fixed frame and at least one opening leaf and, on the other hand, sealing means that provide sealing between the fixed frame and the opening leaf when the door is closed. The or each opening leaf comprises, on the one hand, a framework surrounding an empty space capable of accepting or forming a thermal insulator and being sandwiched between two layers and of thermal insulation each essentially produced from a material having low thermal conductivity or diffusivity and, on the other hand, if appropriate, at least one thermal break.