Laboratory Ventilation Layout With Rolling Airflow to Cut Drafts
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Solution Overview
Problem
Existing ventilation systems in laboratory rooms often cause drafts and increase energy consumption due to inefficient air mixing and temperature distribution, leading to health issues and high energy costs.
Innovation Solution
A ventilation arrangement featuring a supply air duct with lateral air outlet sections and an exhaust air duct that creates air rolls to separate the supply and exhaust air streams, reducing draft speeds and enhancing thermal stratification, allowing cooler air to target only the occupied zone while warm air is efficiently extracted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooled supply air is supplied at high air exchange rates with low supply air temperatures, then the cooling effect is improved, but draft speeds increase and cause health problems
Solution Approach 1:
The supply air duct is divided into multiple lateral supply sections with air outlet openings distributed along its length. This segmentation allows the cooled supply air to be delivered at lower velocities at multiple locations rather than concentrated at a single point, reducing draft speeds while maintaining effective cooling coverage in the occupied zone.
2Temperature
If supply air ducts are arranged above the aisle area, then the cooling coverage is improved, but harmful mixing with exhaust air occurs
Solution Approach 1:
A vertical separator is introduced as an intermediary element between the supply air duct and the exhaust air duct. This separator extends from the support frame downward and prevents direct mixing between the cooled supply air and the warm exhaust air containing pollutants, while still allowing both ducts to be positioned above the aisle area for effective cooling and ventilation.
3Speed
If textile ducts with microperforation are used, then the risk of drafts is reduced, but the entire cross-sectional width causes mixing in work table areas
Solution Approach 1:
Instead of uniform perforation across the entire duct cross-section, the invention applies perforations only to specific lateral supply sections at predetermined locations. This local quality approach ensures that cooled air is delivered only where needed in the occupied zone, preventing unwanted mixing in work table areas while still reducing draft risks through the microperforation design.
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 reduces draft speeds, lowers energy consumption by up to 20%, and enhances safety by minimizing pollutant mixing, allowing for flexible adaptation to different laboratory designs and reduced air exchange rates while maintaining effective air quality.
Implementation Method 1
an air roll or air vortex forms on both sides of the aisle area
Implementation Method 2
enhancing thermal stratification, allowing cooler air to target only the occupied zone while warm air is efficiently extracted
Implementation Method 3
the used, and compared to the supply air heated exhaust air out the room
Implementation Method 4
warm air is efficiently extracted
Data Source
Figure 1
Figure 2
AI summary
An arrangement for ventilating a room (2), in particular a laboratory room with an aisle region (4) bounded to both sides by worktables (6a, 6b), comprising a supply air duct (8) arranged above the aisle region (4) for delivering fresh air into the room (2) and, arranged above said supply air duct, an exhaust air duct (14) for discharging exhaust air from the room (2), wherein the supply air duct (8) has a multiplicity of air outlet openings (10a, 10b) from which the supply air exits above the aisle region (4), said arrangement being characterized in that the supply air duct (8) comprises two lateral air delivery portions (8a, 8b) which extend along the aisle region (4) and which each comprise a multiplicity of circular air outlet openings (10a, 10b) from which the supply air exits laterally in the direction of the worktables (6a, 6b), in that a substantially airtight central separating portion (8c) is provided and separates the first and the second air delivery portion (8a, 8b) from one another, and in that the exhaust air duct (14) comprises two slot-like suction openings (14a, 14b) which extend substantially parallel to the supply air duct (8) and which are arranged in the region of the ceiling (16) of the room (2) in such a way that there is formed on both sides of the aisle region (4) a rolling air flow (18a, 18b) via which supply air heated in the region of the worktables (6a, 6b) passes in a vertical direction into the region (28) of the ceiling (16) of the room (2).