Modular Fan Array Segmentation for Turndown and Redundancy
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Solution Overview
Problem
Existing solitary roof exhaust fan installations are hazardous for maintenance, have limited turndown capabilities, and result in complete ventilation system downtime during repairs, with practical operating range limited to 50% of the highest rated flowrate.
Innovation Solution
A modular array of smaller fans, each powered by an electronic commutator motor, allowing for flexible configuration and sequencing to achieve higher turndown limits and redundancy, reducing maintenance risks and enabling operation from 12.5% to 100% of the combined flowrate capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a solitary large fan is used, then the fan can provide high flowrate capacity, but maintenance becomes hazardous and requires crane equipment
Solution Approach 1:
The patent divides a single large fan system into multiple smaller fan modules arranged in an array. Each module can be independently maintained without requiring crane equipment, as they are accessible from ground level. The modular design maintains total flowrate capacity while improving maintenance safety through parallel architecture.
2Productivity
If a solitary large fan is used, then the fan can provide high flowrate capacity, but the system experiences complete downtime during repairs
Solution Approach 1:
The fan system is segmented into multiple independent modules that can operate in parallel. When one module requires maintenance, the other modules continue to provide ventilation service, ensuring system availability is maintained while preserving total flowrate capacity through redundant architecture.
Solution Approach 2:
The modular array design provides built-in redundancy where spare modules are already in place and can immediately compensate for any module taken offline for maintenance. This beforehand cushioning ensures continuous operation and prevents complete system downtime.
3Use of energy by moving object
If a solitary fan operates at reduced speed, then energy consumption decreases, but the turndown capability is limited to 50% of rated flowrate
Solution Approach 1:
By dividing the system into multiple independently controllable fan modules, the patent enables fine-grained flowrate adjustment. Individual modules can be cycled on/off or modulated to achieve precise turndown ratios, allowing the system to operate efficiently at various load conditions without being limited to 50% minimum operation.
Solution Approach 2:
The modular array enables dynamic control where fan modules can be selectively activated or deactivated based on real-time ventilation requirements. This dynamic configuration allows the system to adapt to varying load conditions and achieve superior turndown capability compared to a single fan operating at fixed or variable speed.
Data Source
AI summary
A Modular Fan Array of a 2×2 array of small fan modules provides many advantages over the replacement of duty of a solitary large fan, including some of the following advantages: —the combined flowrate capacity of the Fan Array can be sized equal to or in excess of the 100% flowrate capacity of the large fan, however a turndown limit of 50% will result in the Fan Array only having a turndown limit of 12.5%. There is a redundancy fan modules. With one going OFFLINE the other three can provide some measure of ventilation, while with the large fan going OFFLINE, ventilation is disable completely.