In this model, we have a standard 1,000 sq.ft. classroom, 28 students, and one teacher. The simulation tracks an hour of one student continually breathing, exhaling respiratory droplets ranging from 0.5-1 micron in size, into the space.
In the first scenario you will see how air moves through the space with sub-standard ventilation and no air purification equipment. An unfortunate reality for many older classrooms throughout North America.
One minute into the simulation, we see a high concentration of aerosols exhaled by the student. These aerosols are moving upwards to the ceiling and circulating towards the back of the classroom. Blue represents a lower concentration of aerosols, while red represents a higher concentration.
Three minutes later, these exhaled aerosols have started to disperse into more areas on the classroom, and are dangerously close to the breathing zone of the other students.
Seven minutes into the simulation, air carrying a high concentration of exhaled aerosols has moved into the breathing zone of several students, this means other students are now breathing in the exhaled air.
After 10 minutes, the room has been mostly filled with concentrated exhaled aerosols.
In this scenario the same classroom now has a Price Room Air Purifier, to provide an additional 2 clean air changes per hour in accordance with ASHRAE and CDC recommendations. The RAP utilizes a healthcare grade HEPA filter, capable of filtering air at a minimum efficiency of 99.97%.
One minute into the second simulation, we can see the predicted impact of the RAP and its ability to dilute the concentrations of exhaled aerosols, indicated by the initially red streamlines transitioning to yellow.
Four minutes into the simulation, the air has travelled a greater distance, and is diluted to a lower aerosol concentration, corresponding to increased levels of clean air.
Seven and ten minutes into the simulation the air in the classroom is increasingly diluted, well-mixed, and has an even lower aerosol concentration. The simulated concentration levels project that using the Price Room Air Purifier can increase the levels of clean air in the space.
Without the RAP, 30 minutes of constant exhalation of respiratory aerosols, results in high aerosol concentrations directly in or near the breathing zone for over 80% of the simulated room occupants. The activated RAP can help reduce particle concentration and improve air quality.
With Price Room Air Purifier
Without Price Room Air Purifier
Particle concentration at average seating breathing level after 30min.
