Fan array fault response control system
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Solution Overview
Problem
Heat rejection apparatuses, such as cooling towers, face operational challenges when one or more fans become non-operational, leading to air and water leakage, which can be detrimental in subfreezing climates and affect device performance, especially in large arrays where physical barriers or louvers are impractical and costly.
Innovation Solution
A fan array fault response control system that includes a processor communicating with fans to detect non-operational fans and adjust operational fan speeds, reducing air pressure and liquid egress, while maintaining airflow, by implementing a safe mode that limits fan speeds near non-operational fans and allows full speeds in other areas, and an override mode for peak demand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If operational fans continue to run at full speed when a fan fails, then airflow generation is maintained, but air pressure pushes liquid out through the non-operational fan opening
Solution Approach 1:
The system dynamically adjusts fan speeds based on operational status. When a fan failure is detected, the control system automatically reduces the speed of neighboring operational fans to prevent liquid egress, while allowing fans farther away to maintain full speed for optimal airflow generation.
Solution Approach 2:
The control system applies different speed limits to different fans based on their proximity to the non-operational fan. Fans adjacent to the failed fan operate at reduced speed to prevent liquid leakage, while fans at greater distances operate at full speed, creating a localized response to the failure condition.
2Object-generated harmful factors
If physical barriers or louvers are installed between fans to prevent liquid egress, then liquid leakage is reduced, but device complexity and maintenance difficulty increase
Solution Approach 1:
The system replaces mechanical physical barriers with an electronic control system that dynamically adjusts fan speeds. This substitution eliminates the need for complex structural modifications while achieving the same liquid egress prevention goal through intelligent speed management.
3Object-generated harmful factors
If all operational fans are slowed down when one fan fails, then liquid egress is minimized, but total airflow and cooling performance decrease
Solution Approach 1:
The control system applies speed reduction only to fans in close proximity to the non-operational fan, while allowing fans at greater distances to maintain full operational speed. This localized approach minimizes liquid egress at the problem area while preserving overall airflow and cooling performance.
Solution Approach 2:
Instead of uniformly reducing all fan speeds, the system applies partial action by selectively controlling only the necessary fans near the failure point. This maintains excessive airflow capacity in other areas, ensuring overall system performance remains adequate.
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 effectively minimizes water and air leakage from non-operational fans, maintains airflow, and allows for efficient operation during peak cooling demands by dynamically adjusting fan speeds, thus enhancing the reliability and performance of heat rejection apparatuses.
Implementation Method 1
The processor is configured to detect at least one non-operational fan of the plurality of fans
Implementation Method 2
The plurality of fans is configured to generate airflow relative to the heat exchanger
Implementation Method 3
The processor is configured to effect a reduced fan speed of the at least one operational fan to reduce air pressure within the cooling tower acting on the non-operational fan
Data Source
AI summary
In one aspect, a fan array fault response control system is provided for a cooling tower. The fan array fault response control system includes a fan interface configured to be in communication with a plurality of fans of the cooling tower and a processor operably coupled to the fan interface. The processor is configured to detect at least one non-operational fan of the plurality of fans. The processor configured to effect, in response to detecting the at least one non-operational fan, a reduced fan speed of at least one operational fan of the plurality of fans.