Angled-Channel Sampling in Fan-Vented Enclosures for Smoke Detection
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Solution Overview
Problem
Existing solutions for smoke detection in fan vented enclosures are economically impractical and negatively impact cooling efficiency, making it difficult to provide immediate and localized information about fire or smoke events within data-centers.
Innovation Solution
Implementing angled channels within the vented enclosures to redirect air samples to detectors while allowing bypass air to maintain cooling efficiency, using a detector configuration that is less than the number of air columns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If smoke detectors are placed at each fan or exit port to detect isolated air columns, then smoke detection capability is improved, but device cost and complexity increase significantly
Solution Approach 1:
The patent introduces angled channels as intermediary structures that collect air samples from multiple air columns and redirect them to a single detector. This mediator allows one detector to monitor multiple air columns, reducing the detector count from matching the number of fans to a much smaller number while maintaining detection reliability across all air columns.
Solution Approach 2:
The angled channels merge air samples from multiple isolated air columns into a single flow path that leads to one detector. This combining mechanism allows multiple detection functions to be consolidated into a single detector unit, significantly reducing system complexity while preserving the ability to detect smoke in any air column.
2Reliability
If walls or structures are placed within the vented enclosure to guide air flow, then smoke detection is improved, but cooling efficiency deteriorates
Solution Approach 1:
The angled channels are designed with specific geometric properties (angles, dimensions, positioning) that are locally optimized to intercept air samples from air columns while allowing the majority of air flow to bypass the channels. This local quality design ensures that smoke detection is enhanced without significantly impeding the overall cooling airflow and thermal management function of the enclosure.
Solution Approach 2:
The angled channels intercept only a partial portion of the air flow (specifically air samples from air columns) rather than blocking the entire flow path. This partial action approach allows sufficient air to bypass the channels to maintain cooling efficiency while still capturing enough smoke-laden air for reliable detection.
3Productivity
If multiple high velocity cooling fans are used to provide adequate cooling, then cooling performance is improved, but air column isolation increases making smoke detection more difficult
Solution Approach 1:
The angled channels serve as intermediaries that bridge the isolated air columns created by high-velocity fans and the detection system. These channels intercept air samples from the isolated columns and redirect them to detectors, overcoming the isolation problem caused by strong fan-generated air currents while preserving the fans' cooling performance.
Solution Approach 2:
The angled channels are positioned and configured in advance to intercept air samples from air columns before the smoke can be completely carried away by the high-velocity fan flow. This preliminary sampling action ensures that smoke detection occurs while the air column is still accessible, despite the isolating effect of the fans' high-velocity airflow.
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 solution provides economical, immediate, and localized smoke detection without degrading the cooling efficiency of the vented enclosures, allowing for widespread industry adoption.
Implementation Method 1
The angled channel can redirect a sample of air from within the air column, and across the air columns, to a detector
Implementation Method 2
The detector can be configured to detect smoke, aerosols, or other suspended particles
Data Source
AI summary
A method and apparatus can include: a fan vented enclosure with cooling fans for creating air columns, each of the air columns corresponding to one of the cooling fans; a detector coupled to the fan vented enclosure; and an angled channel coupled to the fan vented enclosure, the angled channel configured to redirect a sample across at least one of the air columns to the detector such that a number of detectors is less than a number of air columns, the angled channel further configured to allow bypass air to flow around the angled channel.