Multi-Fan Cooling System Speed Control to Minimize Power Consumption
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Solution Overview
Problem
Existing cooling fan systems consume wasteful electric power due to suboptimal combinations of rotational speeds when multiple fans are used for cooling, leading to inefficient power usage.
Innovation Solution
A cooling fan automatic control system that includes a temperature sensor, current sensors for each fan, and a controller to adjust the rotational speeds of fans based on measured power consumption, either by prioritizing fans with higher current values or following a pre-set order to minimize total power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If multiple cooling fans operate at high rotational speeds to ensure adequate cooling, then cooling performance is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the rotational speeds of multiple cooling fans based on real-time temperature measurements and power consumption data. The controller continuously monitors the operating conditions and optimizes the speed combination of fans to achieve adequate cooling while minimizing total power consumption, rather than operating all fans at fixed high speeds
Solution Approach 2:
The system changes the operational parameters (rotational speeds) of the cooling fans to find the optimal combination that satisfies cooling requirements with minimum power consumption. By varying the speed parameters of individual fans and evaluating their impact on total power consumption, the system identifies the most energy-efficient operating point
2Use of energy by moving object
If rotational speeds of multiple cooling fans are controlled to reduce total power consumption, then power efficiency is improved, but cooling performance may deteriorate
Solution Approach 1:
The system employs feedback control by continuously monitoring both temperature measurements and power consumption data from multiple fans. The controller uses this feedback information to adjust the rotational speeds of fans in real-time, ensuring that cooling performance requirements are met while optimizing power efficiency. The feedback loop prevents cooling performance deterioration by detecting temperature changes and adjusting fan speeds accordingly
Solution Approach 2:
The system dynamically balances the trade-off between power efficiency and cooling performance by continuously adapting fan rotational speeds based on actual operating conditions. Rather than using fixed speed settings, the system maintains the ability to quickly respond to changing thermal conditions while optimizing energy consumption
3Use of energy by moving object
If individual current measurement for each fan is implemented to optimize speed control, then power consumption optimization is improved, but device complexity increases
Solution Approach 1:
The controller is designed to perform multiple functions: it controls the rotational speeds of multiple fans, measures individual current consumption of each fan, processes temperature data, and optimizes the overall system performance. By making the controller multi-functional, the system avoids adding separate dedicated devices for each function, thereby minimizing the increase in device complexity while achieving detailed power consumption optimization
Data Source
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AI summary
A cooling fan automatic control system includes: a temperature sensor configured to measure a temperature of an object to be cooled; a plurality of current sensors configured to measure power consumption by each of a plurality of cooling fans; and a controller which, when a measured temperature that is a measured value obtained by the temperature sensor is higher than a target cooling temperature of the object to be cooled, controls rotational speeds of the plurality of cooling fans so as to minimize a total of measured current values of the plurality of cooling fans obtained by the plurality of current sensors.