New Development 1/8/2021: Texas A&M Students Design Rapid COVID-19 Detection System Is it possible to control a mechanical or chemical process without metrics? Yes, but how will you know how successful you are or how effective the process is without comparing the ‘before’ and the ‘after’? Is it possible to drop devastating bombs over an …
Continue reading “IAQ: Measurement and Verification (Metrics)”
What if there is a way to scrub the surfaces of tables, chairs, buses, etc. while also scrubbing the indoor climate of germs?
Fear Analysis Fear is like a virus. It can infect you and ruin your productivity and your life. Fear is contagious and can spread like wildfire. Everyone feels fear. When A-Performers get infected, they face it and deal with it. If you avoid or ignore fear, or make up excuses for this disease, your infection gets …
At the outset of the SARS-CoV-2/COVID-19 outbreak in China, researchers identified an airconditioned five-story windowless restaurant common to ten cases of infection. The study concluded the key factor for infection was the direction of the airflow. The researches also stated, “Virus transmission in this outbreak cannot be explained by droplet transmission alone.” Ventilation, the lack …
Air expands when heated and contracts when cooled. In the picture to the right, the test tube and the beaker both contain .5 ounce of water. The test tube volume represents dense cool air. The beaker volume represents expanded warm air. In this visual example, the relative humidity of the beaker is 10%. Contrast this …
Ventilation Is Important The American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) underscores the importance of ventilation and air filtration in reducing the transmission of COVID-19 through the position statement: “Transmission of SARS-CoV-2 through the air is sufficiently likely that airborne exposure to the virus should be controlled. Changes to building operations, including the …
Do you worry about COVID-19? Here is more to worry over. Our human nature wants tangible, visible evidence of threats to our persons. This works to our good when a threat is a reckless driver or a pothole in a road. But airborne pathogens are invisible threats. The graphic depicts the relative sizes of a …
Definition of air filter: a porous substance that allows air to pass but retains suspended solid particles What about masks? There are three air filters featured in the above picture but only one is called an air filter, the one in the return air stream of the HVAC system. But, the vacuum cleaner bag and …
Originally posted 4 June 2020 | Updated 1 Sep 2020 The experts call for ‘social distancing’ of between three and six feet between persons. Can we talk? Do you know why droplets are called droplets? The word formed by the first four letters is your clue: they are heavier than air. Gravity causes them to …
How does your choice of mask work for you?
John N. White