3 ms·
I'm not sure what the overall calculation looks like but if you remove 10-15 liters per minute per occupant to match normal respiration that's a pretty small lo
by hedgehog 2y ago
I'm not sure what the overall calculation looks like but if you remove 10-15 liters per minute per occupant to match normal respiration that's a pretty small loss of heat. Maybe a net win if it reduces need for other ventilation and dehumidification enough. It's not just an infection control thing, the building needs some fresh air anyway to get fresh air in and remove CO2 + all the other nasties that accumulate indoors (cleaning chemicals, radon, various solvents plasticizers, even stuff wafting out of the floor if like some major offices in the valley you're built on contaminated ground).
- kurthr 2y agoSo call it 400 liters/min at 30C delta with air's heat capacity about 1kJ/kg/C and 800 liters/kg. You're at 15kJ/min or 250W just for that airflow. Figure there are 40 rooms and you're at 10kW of heating just for that fresh air flow. An ERV can cut that by 90%. You just saved 9kW of continuous power for the building during the winter with an ERV.