(734) 327 4079 info@ansight.com
AnSight’s Solutions for COVID-19

Health-Care Patient-Room HVAC Airflow Patterns

HPAC Engineering. March 2015


Kishor Khankari


CFD models are developed to evaluate the impact of various HVAC design configurations on the airflow patterns, temperature distribution, and resulting thermal comfort of occupants, and on the probable flow path of airborne particles released from the patient’s face. These analyses indicate the linear diffusers combined with high supply air flow rates (high air change rates) can cause strong recirculation and entrainment (induction) flows in the room. Depending on the location of the return the airborne particles released from the patient’s face can get entrained back into the supply air stream and can eventually spread into the entire room. However, this study indicates placement of a return grill right behind the linear supply diffuser over the patient’s head can potentially provide ready flow path to airborne particles to exit out of the room without significant recirculation and entrainment back into the supply stream. This study demonstrates that a careful evaluation of the HVAC configuration can help in gaining the insight and optimizing the flow path of air to obtain the desired combination of occupant thermal comfort and the best possible hygienic conditions in patient rooms.

Fill the following form to download

    About the author

    Dr. Kishor Khankari

    ASHRAE Fellow, ASHRAE Distinguished Lecturer

    Dr Kishor Khankari is the founder of AnSight LLC. As a specialist in Computational Fluid Dynamics (CFD), his passion for solving engineering problems and providing sound scientific solutions has led to innovations and optimized designs in the industry.

    A noted expert in his field, he has a Ph.D. from the University of Minnesota and has published in several technical journals and trade magazines. As a well sought-after speaker Dr. Khankari makes regular presentations in various technical conferences and professional meetings worldwide.

    Recent Posts

    Ventilation Guidance for Residential Kitchen with Gas Stove

    Recently the residential gas stoves were in the News due to the generation of pollutants during their operation. Cooking activities as well as the combustion of natural gas through gas stove burners produce several indoor pollutants. Exhausting these pollutants from...

    CFD Analysis of Residential Kitchen Ventilation with Gas Stove

    Proper ventilation of the kitchen is essential to reduce the occupant exposure to various pollutants generated during the cooking and the combustion of natural gas through the gas stove burners. Several parameters related to the design and operation can affect the...

    CFD Analysis of Demand Control Ventilation for Laboratories

    What is Demand Control Ventilation (DCV)? Often high air change rates per hour (ACH) are specified for laboratories to meet the goal of ventilation. The ACH numbers specified are mostly consensuses based on simplistic approaches of perfect mixing of contaminants with...

    CFD Analysis Evaluates Efficacy of Reactive Air Cleaning Technology

    What is reactive air cleaning? Reactive air cleaning involves the release of reactive agents in the room to actively mitigate airborne pathogens and other pollutants. Unlike traditional dilution ventilation in which the concentration of the airborne pathogens in the...