Overlapping Gutter Water Collection for Evaporative Cooling Towers
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Solution Overview
Problem
Evaporative cooling towers face challenges in air distribution and airflow resistance, leading to reduced thermal capacity and increased energy consumption, while also requiring complex maintenance and being prone to water-related issues like splashing and biological growth.
Innovation Solution
The implementation of an overlapping gutter water collection system that collects spray water while allowing air to flow vertically, reducing airflow resistance and enhancing thermal performance, combined with a design that facilitates easy maintenance and self-cleaning by directing water cascades and incorporating features like louvers and integral dampers to manage airflow and water effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional water collection systems are used in evaporative cooling towers, then water collection function is provided, but airflow resistance increases and thermal capacity is reduced
Solution Approach 1:
The water collection system is segmented into multiple gutters arranged in overlapping rows, where each gutter collects water independently and directs it to the sump. This segmentation allows air to flow vertically through gaps between overlapping gutters while water is collected horizontally, reducing airflow resistance and maintaining thermal capacity.
Solution Approach 2:
The gutter assembly is oriented horizontally to collect water falling from the heat exchanger, while air flows vertically through the gaps between overlapping gutters. This dimensional separation of water collection (horizontal) and air flow (vertical) paths eliminates the trade-off between water collection efficiency and airflow resistance.
2Reliability
If complex water collection systems are implemented, then water collection efficiency improves, but device complexity and maintenance difficulty increase
Solution Approach 1:
The overlapping gutter assembly performs multiple functions: it collects water from the heat exchanger, directs water to the sump, and simultaneously provides structural support for the heat exchanger. This multi-functionality reduces the number of separate components needed, simplifying the overall system while maintaining water collection efficiency.
Solution Approach 2:
The gutter assembly is designed with a slope that directs water automatically to the sump without requiring additional pumps or complex control systems. The overlapping configuration also allows the system to self-regulate water flow distribution, reducing the need for complex mechanical components and simplifying maintenance.
3Device complexity
If water is directed directly to sump without cascading, then water collection is simplified, but biological growth and water-related issues increase
Solution Approach 1:
The cascading water flow created by the gutter assembly generates periodic turbulence and air mixing as water falls through multiple levels to the sump. This periodic action prevents stagnant water conditions that promote biological growth, while the simple cascading design requires no additional mechanical components.
4Area of stationary object
If fan assembly is positioned below heat exchanger, then compact design is achieved, but water splashing and maintenance access become problematic
Solution Approach 1:
The sump is extracted from the main tower structure and positioned externally below the gutter assembly. This separation removes the water collection and storage function from the main air flow path, allowing the fan assembly to be positioned compactly below the heat exchanger while maintaining easy access to the sump for maintenance and reducing water splashing into the fan area.
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 solution improves airflow distribution, reduces energy consumption, enhances thermal performance, and simplifies maintenance by minimizing water-related issues and promoting a self-cleaning environment within the cooling tower.
Implementation Method 1
evaporative heat exchanger
Implementation Method 2
evaporative cooling tower
Implementation Method 3
fan assembly located within the outer structure
Implementation Method 4
gutter assembly collects a portion of the evaporative liquid and directs the collected evaporative liquid to the sump
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
An improved water management system with improved airflow distribution for counterflow evaporative heat exchangers is provided. Such heat exchangers include open cooling towers, closed circuit cooling towers, and evaporative condensers. The improved water management system eliminates water splash out and the noise associated with water splashing. Further when the fan assemblies are located below the evaporative heat exchanger, the improved water management system keeps the fans dry and prevents freezing in subzero climates.