Parallel Fan Group Speed Control for Optimal Efficiency Balance
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Solution Overview
Problem
Fan groups operating in parallel often fail to achieve optimal efficiency due to the total volume flow being lower than the sum of individual fan flows, resulting in suboptimal performance and efficiency, especially when fans operate below their efficiency range.
Innovation Solution
A method is introduced to control fan groups by dividing them into two control groups, where the first group's fans are operated at optimal efficiency to increase their individual volume flow, while the second group's fans are reduced in speed to maintain a constant total volume flow, ensuring all fans contribute without being switched off, thus optimizing energy balance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the total volume flow rate is kept constant in a fan group operating in parallel, then the system can operate within duct networks with changing pressure conditions, but the individual fans operate below their optimal efficiency range resulting in low overall efficiency
Solution Approach 1:
The fan group is divided into multiple control groups, where each control group can be independently regulated. This segmentation allows different fans to operate at different speeds and volume flow rates, enabling individual fans to be positioned on their optimal efficiency curves while collectively maintaining the required total volume flow rate and adapting to pressure conditions.
2Productivity
If individual fans are switched off to reduce partial volume flow, then the total volume flow can be adjusted, but structural modifications are required to prevent backflow increasing device complexity and costs
Solution Approach 1:
Instead of statically switching fans on or off, the system dynamically adjusts the speed of each fan individually through independent control groups. This dynamic speed regulation allows continuous adjustment of volume flow rates without requiring structural modifications like dampers or backflow prevention devices, as all fans remain operational and contribute to the total volume flow.
3Stability of the object's composition
If fans are operated to the left of their performance curve to maintain constant total volume flow, then the system maintains stability, but the fans operate below their optimal efficiency resulting in undesirably low overall efficiency
Solution Approach 1:
Different control groups are assigned different operating characteristics. The first control group operates fans at higher volume flow rates closer to their optimal efficiency points, while the second control group operates fans at lower volume flow rates. This local differentiation in operating quality allows the system to achieve both stability and high overall efficiency by optimizing each control group's contribution.
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 approach enhances the overall efficiency of the fan group by operating the first control group at higher performance and closer to optimal efficiency, while reducing the performance of the second control group, maintaining a constant total volume flow and improving the system's energy balance.
Implementation Method 1
method for controlling a fan group (100) in which a predefined total volume flow rate (Qsum) is to be generated
Data Source
AI summary
The invention relates to a method for regulating a ventilator group in order to produce a defined total volume current. The ventilator group consists of a plurality of individual ventilators which are operated in parallel and each of which generates an individual volume flow. The ventilator group is divided into at least one first and at least one second regulating group, each group comprising at least one ventilator. While maintaining a consequently constant total volume flow, the individual volume flow of the at least one ventilator of the first regulating group is increased by being regulated into the range of the optimal degree of efficiency by changing the rotational speed, and the individual volume flow of the at least one ventilator of the second regulating group is reduced in a corresponding manner by reducing the rotational speed. At all times, all the ventilators contribute to the total volume flow, and no ventilator of the second regulating group is deactivated at any time. The at least one first regulating group is regulated to its optimum degree of efficiency within its highest power consumption such that the energy balance of the entire system of the ventilator group is optimized.