Ventilation and drying system and method of using the same
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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 removal efficiency and prolonging drying times, which can lead to health and safety issues from wet surfaces and bacterial growth.
Innovation Solution
A ventilation system that combines air evacuation and recirculation capabilities, using a fan assembly with a manifold, outlet damper, and port damper, along with a switching sub-system to manage airflow, thereby reducing negative pressure and enhancing drying efficiency by cycling between evacuation and recirculation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional evacuation fans are used in enclosed spaces, then air removal function is provided, but negative pressure buildup occurs which hampers evacuation efficiency
Solution Approach 1:
The system segments the air removal function into two distinct modes: evacuation mode (removing air from enclosure) and recirculation mode (circulating air within enclosure). This segmentation allows the system to address negative pressure buildup by periodically switching to recirculation mode, which equalizes pressure while maintaining air exchange benefits.
Solution Approach 2:
The control system implements periodic switching between evacuation and recirculation modes. This periodic action prevents sustained negative pressure buildup by intermittently introducing fresh air through the recirculation mode, thereby maintaining evacuation efficiency without continuous pressure issues.
2Productivity
If conventional evacuation fans operate continuously, then air evacuation is maintained, but drying time is prolonged due to negative pressure effects
Solution Approach 1:
The system uses periodic switching between evacuation and recirculation modes to maintain positive airflow dynamics. This prevents the negative pressure that would otherwise extend drying time, allowing wet surfaces to dry more efficiently by maintaining better airflow conditions throughout the enclosure.
Solution Approach 2:
The recirculation mode ensures continuous useful airflow action within the enclosure even when not actively evacuating. This continuous air movement prevents stagnation and maintains drying efficiency, eliminating the downtime that would occur with conventional fans that must cycle off due to pressure buildup.
3Object-affected harmful factors
If evacuation fans remove humid air, then air quality improves, but drying time increases due to prolonged operation needed
Solution Approach 1:
The system periodically alternates between evacuation mode (removing humid air) and recirculation mode (distributing drier air throughout the enclosure). This periodic action accelerates the drying process by combining active humid air removal with passive air distribution, reducing the total operation time needed to achieve the same drying effect.
Solution Approach 2:
The recirculation mode acts as an intermediary process between evacuation cycles. It distributes the drier air that has been evacuated back throughout the enclosure, creating a more uniform drying environment and reducing the time needed for complete drying without requiring continuous high-power evacuation operation.
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 limits bacterial growth by effectively managing airflow to prevent moisture accumulation, thus enhancing safety and cleanliness.
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
AI summary
An air handling system includes a housing, a blower, a sensor, an air intake valve, and a controller. The housing includes an outlet to a passenger compartment, a fresh air inlet providing fresh air into the housing and a recirculated air inlet that guides air flow from the passenger compartment into the housing. The blower moves air through the housing. The air intake valve moves between a closed position blocking air flow from the fresh air inlet into the housing and an open position unblocking air flow from the fresh air inlet into the housing. The controller positions the air intake valve relative to the fresh air inlet controlling the flow of fresh air into the housing and thereby maintaining moisture density of the air flow entering the passenger compartment within a prescribed range based on humidity and temperature values from the sensor.