Diffusively Open Wall Air Section for Condensation Control
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Solution Overview
Problem
Low-energy houses face challenges with condensation water accumulation due to high relative air humidity, which requires airtight and vapor-proof measures, leading to ventilation issues, heat loss, and health concerns from mechanical ventilation systems.
Innovation Solution
The construction incorporates a diffusively open outer wall and ceiling system that allows water vapor to escape through the use of warm air sections above the water vapor dew point, utilizing the light greenhouse effect for temperature maintenance and natural steam pressure flow, eliminating the need for vapor-proof barriers and mechanical ventilators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If airtight and vapor-proof prevention is installed to prevent condensation water accumulation, then wall damage and mold growth are avoided, but relative air humidity increases and ventilation efficiency decreases
Solution Approach 1:
The wall structure is divided into multiple layers with distinct functions: an inner house layer, an air section, and an outer house layer. The diffusively open cover allows vapor to pass through while the air section captures and transports it, segmenting the vapor management function across different structural components rather than relying on a single vapor-proof barrier.
Solution Approach 2:
The air section acts as an intermediary between the inner and outer houses. It receives water vapor that passes through the diffusively open cover, transports it through natural convection and diffusion, and releases it at the outer surface, thereby mediating the vapor transport process without requiring vapor-proof barriers in the traditional sense.
2Object-generated harmful factors
If mechanical ventilators are installed to lower relative air humidity, then water vapor is removed from the room, but heat loss increases and ventilation heat waste occurs
Solution Approach 1:
The air section system operates autonomously using natural physical processes. The temperature difference between the warm inner house and the cooler air section creates natural convection currents that draw vapor-laden air through the wall structure. The light greenhouse effect in the air section maintains the temperature gradient, enabling the system to self-regulate vapor transport without mechanical intervention.
Solution Approach 2:
The patent replaces mechanical ventilation systems with a passive physical process-based system. Instead of using electric fans and mechanical airflow generation, the invention utilizes natural convection, diffusion, and the light greenhouse effect to achieve vapor transport, thereby eliminating the need for mechanical components and their associated energy consumption.
3Loss of energy
If mechanical ventilators with heat regeneration are installed to save heat, then ventilation heat waste is reduced, but device complexity and installation cost increase
Solution Approach 1:
The invention extracts the essential function of vapor removal from the complex mechanical ventilation system and implements it through a simple passive structure. By taking out the active mechanical components and replacing them with a diffusively open cover and air section, the system achieves vapor management through basic physical processes, dramatically reducing device complexity while maintaining effectiveness.
4Reliability
If vapor-proof brake is installed in the inner wall to prevent condensation, then condensation water accumulation is avoided, but water vapor infiltration into walls increases and mold growth is supported
Solution Approach 1:
The patent converts the potentially harmful water vapor that would normally condense in the wall into a beneficial transport medium. The vapor that passes through the diffusively open cover is captured by the air section and transported to the outer surface, where it is released. This transforms what would be a harmful condensation process into a useful vapor transport mechanism that prevents both wall condensation and indoor humidity buildup.
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 solution effectively manages water vapor without condensation, reducing ventilation heat waste and maintaining indoor air quality without mechanical ventilation, allowing for larger and more varied house designs while ensuring stability and energy efficiency.
Implementation Method 1
a heat conducting element which transfers heat generated by solar irradiation onto the panel to the surrounding air
Implementation Method 2
The necessary temperature of the air section between the inner and the outer house is reached by the utilization of the light greenhouse effect
Implementation Method 3
lead the dry water steam (water gas) away from the room through the wall, according to the Fick law of concentration declivity and natural steam pressure flow diffusion
Implementation Method 4
The water steam leaking from the inner house through the diffusively open cover of the inner house into the outer house, closed down from the outer air, is, due to its weight, which is lighter than the air weight, led by the natural lift through the gaps in the roof and the house-top to the outer space
Data Source
AI summary
The aim of present invention is to create such construction of outer wall and ceiling, as is needed to lead the dry water steam (water gas) away from the room through the wall, according to the Fick law of concentration declivity and natural steam pressure flow diffusion, without the water steam being able to concentrate to the condensation water in the wall.