Air circulation and ventilation system
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Solution Overview
Problem
Conventional evacuation fans in bathrooms experience a significant drop in performance due to negative pressure buildup within enclosed spaces, hampering air exhaust efficiency and leading to prolonged drying times, which can result in increased energy consumption and health hazards from moisture and bacterial growth.
Innovation Solution
A ventilation system that combines air evacuation and recirculation capabilities, featuring a fan assembly with intake and outlet apertures, a pressure equalization sub-system to manage pressure differences, and a switching sub-system to control operation modes, allowing for efficient air removal and recirculation to enhance drying times and reduce moisture-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional evacuation fans are used to exhaust air from the enclosure, then air removal function is provided, but negative pressure buildup occurs within the enclosed space which hampers further air exhaust efficiency
Solution Approach 1:
The exhaust air stream is segmented into two separate streams: one stream exits the enclosure through the first outlet aperture to the exterior, while another stream is redirected back into the enclosure through the second outlet aperture. This segmentation allows the system to maintain air removal function while preventing negative pressure buildup by recirculating some air back into the space.
Solution Approach 2:
A portion of the exhaust air acts as an intermediary medium that is redirected back into the enclosure to equalize pressure. This intermediate air stream serves as a buffer that prevents excessive negative pressure from developing while the main exhaust stream continues to remove foul air effectively.
2Productivity
If conventional evacuation fans operate at high power to improve air removal, then air exhaust rate increases, but energy consumption increases and performance drops due to negative pressure
Solution Approach 1:
The system maintains continuous air movement and circulation by recirculating a portion of the exhaust air back into the enclosure. This continuous circulation prevents pressure equalization issues that would otherwise require the fan to work harder, thereby maintaining energy-efficient operation while sustaining high air removal effectiveness.
Solution Approach 2:
The system changes the operational parameters by splitting the exhaust stream and recirculating a portion back into the enclosure. This parameter change allows the fan to operate at optimal efficiency points rather than requiring excessive power to overcome negative pressure buildup, thus reducing overall energy consumption while maintaining high air removal rates.
3Loss of time
If conventional evacuation fans are used, then air can be exhausted from the enclosure, but drying time of the enclosed space is prolonged due to inefficient moisture removal
Solution Approach 1:
The system employs periodic action by cycling between different outlet damper positions to alternately direct exhaust air outward and recirculate it back into the enclosure. This periodic switching creates continuous air movement patterns that enhance evaporation and drying rates while maintaining pressure balance, thereby reducing overall drying time compared to conventional continuous exhaust systems.
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 system improves air removal efficiency, reduces drying time, and minimizes the presence of moisture-related hazards by effectively managing pressure and recirculating air, thereby enhancing safety and cleanliness in enclosed spaces.
Implementation Method 1
a fan configured to draw air in through the first intake aperture
Implementation Method 2
a port damper for selectively opening and closing the port
Data Source
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AI summary
An air circulation and ventilation system for an enclosure. The system includes a fan assembly subsystem with a housing defining a manifold. The housing has a first intake aperture configured to receive air from within the enclosure, a first outlet aperture configured to emit air from the manifold to outside the enclosure, and a fan configured to draw air in through the first intake aperture. The system includes a pressure equalization subsystem having a port configured to allow additional air into the enclosure. The port includes a damper for selectively opening and closing the port. The system also includes a switching subsystem with a switch operably coupled to the fan and the damper. The switch selects between a first mode where the damper is closed and the fan is off and a second mode where the port damper is open and the fan is on.