Analysis of Demand-Controlled Ventilation Using Computational Fluid Dynamics

June 7, 2023
1 p.m. – 2 p.m.
Eastern Time

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Often high airflow rates—or air change rates per hour (ACH)—are specified to cover the risk of chemical exposure in laboratory spaces, resulting in significant energy use. Laboratory ventilation rates can be reduced by using a demand-controlled ventilation (DCV) system that regulates the ACH based on the contaminant concentration in the laboratories monitored by the sensors. Several factors can affect the DCV performance, including the sensor locations, sampling interval, contaminant generation rate, and airflow patterns in the space.

This presentation, which will include computational fluid dynamics (CFD) analysis, will evaluate the performance of DCV for a typical laboratory space looking at three different locations in the lab, as well as in the exhaust duct.

The effectiveness of demand controlled ventilation system will be presented with insightful animations showing the progression and movement of contaminant cloud in the space.

Learning Objectives

  • Learn how demand-control ventilation works for laboratories;
  • Understand various factors that affect performance of the demand control ventilation system;
  • Learn how CFD can be employed to evaluate and optimize the performance of demand control ventilation for laboratories; and
  • Understand how Spread Index and Purge Time can be employed to evaluate ventilation effectiveness.

Instructor Biography

Dr. Kishor Khankari, Ph.D. is the President at AnSight LLC. A specialist in Computational Fluid Dynamics (CFD), he works closely with his clients to provide engineering insights and optimized design solutions using analytical techniques. Kishor has several years of experience in providing consulting services and insights through analysis to a wide variety of engineering problems. Dr. Khankari has developed a patented technology of a wind band design of exhaust fan assembly systems.

A noted expert in his field, he has a Ph.D. in CFD from the University of Minnesota and has been regularly publishing in technical journals and trade magazines. Dr. Khankari is ASHRAE Distinguished Lecturer.

Dr. Kishor Khankari is ASHRAE Fellow and recipient of the ASHRAE Distinguished and Exceptional Service Awards. He is a member of ASHRAE Board Directors serving as Director-at-Large. He is currently leading the I2SL technical group on Ventilation Effectiveness for Laboratories.

 

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