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Session Overview
CPS 19: Paper Session 19
Friday, 24/June/2022:
9:10am - 10:10am

Location: Dominion Ballroom

Session Topics:
Track A: Industrial Ventilation for Process Applications (occupational health, environmental emissions, innovations, best practices, etc)

Track A: Industrial Ventilation for Process Applications (occupational health, environmental emissions, innovations, best practices, etc) 

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Vortex Ventilation for Laboratory Hoods

Lawrence R. Meisenzahl

Vortex Hoods, LLC, United States of America

Vortex ventilation is an innovation in laboratory fume hood design that uses shape and proportion to form a mono-stable vortex inside the hood as air flows through. Harnessing turbulence stabilizes the opened face of the hood as contaminants enveloped in the vortex are dissolved into the exhaust air stream by aggressive mixing. Fume hood ventilation is understood as a dilution process rather than velocity capture. Analysis of measured data reveals a direct causal relationship between fume hood containment and air flow volume (cfm) giving the vortex hood unique attributes. Vortex hood safety requires a constant volume air flow, 12 air changes per minute, while the hood is in use. The constant volume hood can achieve any face velocity between 40 and 120 Ft./min. by sash positioning. Fume hood performance is defined by a dilution ratio (1/190), that is if 190 ppm of tracer gas is emitted in the vortex hood, 1 ppm is expected to escape. With this ratio, industrial hygienist can evaluate exposure risk by direct reference to threshold limit values (TLV’s). Existing fume hoods are easily converted to vortex hoods by replacing the interior baffle. This can be done at minimum capital cost and will reduce operating cost over time.

Preliminary Study On The Efficiency Of Air Showers To Decontaminate Workers From Dust

Alexandre Jenft

INRS, France

An air shower is a self-contained enclosure that uses high velocity jets of air to help decontaminate personnel. It is usually used prior to entering or exiting a controlled environment such as a cleanroom. Air showers are also used by personnel performing operations that generate a high quantity of dust before they head back to the changing room or the canteen for example. In this situation, the aim of using air shower is not to protect the clean environment but the workers from dust contamination. In addition to the high velocity jets, which remove dust from workers’ clothes, a descending flow evacuates the contaminated air from the enclosure and limits the quantity of aerosols near the workers face. However, there is a lack of quantitative knowledge regarding 1) the efficiency of air showers to remove dust from clothes, 2) quantity of dust that pierces through the fabric to contaminate the worker directly through the skin and 3) quantity of dust near the respiratory tract during the process. The latter point could lead to recommendations regarding the need for respiratory protections and help determine those appropriate. This study, currently in the early stages, aims at answering these questions. Preliminary work focuses on numerical simulations of airflow within the air shower and transport of aerosols during the process. Moreover, measurements are performed in industries to assess the quantity of dust close to the workers nose as well as on their clothes, before and after using the air shower.

Use of Ashrae Standards, Acgih Industrial Ventilation Guidelines and Client Standards for Industrial Buildings

Jaimie Ross Handscomb

Stantec, Canada

Industrial buildings can store hazardous products or generate hazardous conditions that require specific consideration outside of most building types. Flammable liquids and vapors, combustible products, and dusts, as well as hazardous airborne particulates and vapors all need to be addressed.

ASHRAE is a standard engineers use when designing HVAC systems as well as filtration requirements. Sometimes, this provides architects and engineers a false sense of security when designing an industrial building, as these facilities require more in-depth review than just typical heating, cooling, and occupancy load calculations that you find are found in most buildings. Questions to ask when reviewing existing buildings, or modifying a process, include: What is the design criteria around the existing facility? Is there enough ventilation? Is ventilation provided in the correct locations? Is the equipment of the correct classification?

It is also important to understand the buildings use, the products and materials in the facility, and process operations. Understanding the products Safety Data Sheets, and the processes being used in the building will inform such requirements as air change rates; locations of supply and exhaust hoods; temperature and humidity control; and options regarding recirculation, exhaust and filtration. This understanding requires additional knowledge of standards like ACGIH “Industrial Ventilation” Guidelines, Fire and Electrical Codes, as well as process specific guidelines from manufacturers, clients, and suppliers.

When you understand the risks of the processes and storage requirements needed within a building, you can better create a ventilation system that allows for contaminate, flammable vapor, and dust control.

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