Fan Assembly with Integrated Filter Slot for High-Flow Make-Up Air
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Solution Overview
Problem
Conventional air conditioner units, particularly packaged terminal air conditioners (PTACs), face challenges in effectively filtering large flow rates of make-up air due to size, cost, and maintenance constraints, which can lead to inadequate air filtration, especially at higher flow rates required by industry standards.
Innovation Solution
A fan assembly is introduced with a fan housing that includes a fan slot for an auxiliary fan and a filter slot for an air filter, positioned within a make-up air duct, allowing for efficient filtration of make-up air without the need for additional sealed systems, and featuring a clam-shell design that simplifies assembly and reduces costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional air filters are used in make-up air subsystems, then the system structure is simple, but the filtration effectiveness is insufficient at higher flow rates
Solution Approach 1:
The air filter is divided into multiple filter media elements arranged in series within the ductwork. Each filter element handles a portion of the air flow, allowing the system to maintain effective filtration at higher overall flow rates by distributing the filtration load across multiple segmented components rather than relying on a single conventional filter
Solution Approach 2:
The filter media are arranged in a three-dimensional configuration within the ductwork, utilizing vertical and horizontal spacing to create multiple filtration stages. This dimensional arrangement increases the total filtration surface area available without expanding the duct footprint, enabling effective filtration at higher flow rates
2Reliability
If larger air filters are used to handle higher flow rates, then filtration effectiveness improves, but size constraints and cost increase
Solution Approach 1:
The filter media are arranged in a three-dimensional configuration within the ductwork, utilizing vertical and horizontal spacing to create multiple filtration stages. This dimensional arrangement increases the total filtration surface area available without expanding the duct footprint, enabling effective filtration at higher flow rates
Solution Approach 2:
Multiple filter media elements are nested within each other or arranged in concentric configurations within the ductwork. This nesting approach maximizes the use of available space, allowing multiple layers of filtration to be packed into a compact volume that fits within standard duct dimensions
3Ease of manufacture
If conventional filtration systems are used, then initial cost is lower, but maintenance complexity and serviceability increase
Solution Approach 1:
The air filter system is segmented into multiple independent filter media elements that can be individually accessed and replaced. This segmentation allows maintenance personnel to service the filtration system without shutting down the entire make-up air subsystem, improving maintenance serviceability while using conventional, cost-effective filter media
Solution Approach 2:
The filter media elements are designed to be extractable from the ductwork through accessible openings or removable sections. This extraction capability allows filter elements to be removed for cleaning or replacement without complex disassembly, reducing maintenance complexity while maintaining effective filtration
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 fan assembly provides effective air filtration at high flow rates while minimizing parts and maintenance costs, ensuring compliance with industry standards and improving air quality in indoor spaces.
Implementation Method 1
an auxiliary fan positioned within the fan slot of the fan housing
Implementation Method 2
an air filter positioned within the filter slot
Data Source
AI summary
An air conditioner unit may include a bulkhead defining an indoor portion and an outdoor portion, a vent aperture defined in the bulkhead, and a fan assembly for urging a flow of make-up air from the outdoor portion through the vent aperture to the indoor portion. The fan assembly includes a fan housing having two clamshell upper and lower portions that collectively define a fan slot, an arcuate filter slot, and a make-up air duct in fluid communication with the vent aperture. An auxiliary fan is positioned within the fan slot of the fan housing an air filter is positioned within the filter slot.