Engineering solutions to support public health

Located in Vancouver, British Columbia, St. George’s School is a boys' university preparatory school with over 1,200 students enrolled in their in-person academic programs.

St. George’s School – Building Operations Assessment

 

"By enhancing the standards of our building operations, St. George’s School can remain confident that we are doing everything we can to keep our entire community safe. Prism has again shared their engineering expertise and acted swiftly to address the vulnerabilities within our buildings and help us reduce the risk of Covid-19 transmission.”

- Radu Beschea, Head of Facilities at St. George's School

 

January 2021

As the COVID-19 or SARS-CoV-2 global pandemic continues to threaten public health around the world, many organizations are taking preventative measures to reduce the risk of transmission within their facilities.

According to the latest research by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), ventilation and filtration provided by heating, ventilating, and air-conditioning systems can reduce the airborne concentration of SARS-CoV-2 and thus the risk of transmission through the air.  Changes to building operations, including the operation of heating, ventilating, and air-conditioning systems, can reduce airborne exposures.

Prism has been working with St. George’s School to conduct a review of their HVAC systems with respect to its existing functionality to mitigate COVID-19 transmission based on best engineering practices and the most up to date ASHRAE guidelines.

Challenge

The facilities team at St. George’s School engaged Prism Engineering to leverage their expertise in mechanical engineering and provide site-specific recommendations based on the newly developed ASHRAE guidelines. The objective is to mitigate the risk of COVID-19 transmission within the facilities.

Solutions

HVAC operations assessments, controls reviews and airflow measurements were conducted to verify the air change rates for each classroom within the Junior and Senior school campuses. A compilation of area-specific ratings with respect to their current effectiveness at mitigating Covid 19 transmission was developed and presented along with a list of recommendations.

Results

Upon initial review, there were several areas within the school campuses that could benefit from immediate improvements and upgrades.  Prism worked with the building operators to promptly address these vulnerabilities. 

Specific actions undertaken included:

  • Addition of local air purifiers, UV and HEPA filters
  • Upgrade of all filtration in air handling systems to MERV 13
  • Investigation and resolution of the HVAC system and control consistency  
  • Upgrades of Direct Digital Controls (DDC):
    • Implementation of ventilation air flush for before and after occupancy
    • Confirmation of outdoor air damper position
    • Updates and confirmation of equipment schedule
  • Validation of the DDC modifications
  • Optimization of local air purifying equipment locations

Based on the actions taken to date, a significant improvement in the controls, filtration and air changes per hour has been obtained.

In areas where immediate action was not practical, occupant loading was reduced, and students were relocated to spaces with lower risk of transmission.

View our Mechanical Design Services brochure to learn how we can optimize your mechanical systems to imrpove indoor air quality and enhance occupant safety.