Hello, I am designing a lab (only 230V max 10A and 24V high current equipment (max 80A), no chemicals except lead acid batteries) that I would like to protect from fire risk.
I own the house and live in it. Not for commercial use. If I screw up, the only one impacted would be me or worst case scenario, firefighters/responders.
I understand the basic tenets of fire suppression. (the fire triangle). I would work on the oxygen part.
The CO2 system would need to displace most of the oxygen in the room, which happens to be 15m^3.
Things in my checklist :
-I would need a one-way passive valve to avoid room overpressure and allow oxygen displacement.
-A failsafe fire hazard detection, multiple sensors on the central ceiling point with a quorum (gas discharge only if 2 of 3 sensors agree that there is a fire situation).
-A safeguard system to disarm discharge if someone is in (manual with timed re-arm). A presence detection could be done but I think it could interfere with fire detection and would not be failsafe.
-An imminent discharge aural and audible alarm and an external panel that would light on and stay lit "CO2 discharge. do not enter"
-A robust, failsafe solenoid/valve that would open only if powered on and if a voltage is applied for a sufficient amount of time (to prevent a transient voltage to trigger a discharge)
-An exhaust and gas distribution nozzle on the ceiling.
-A C02 gas cylinder with sufficient size/pressure.
-Arduino logic to manage all this stuff
Big project, probably overkill and with hazard to personnel possible if not done properly (ear damage, cold burns, or even asphyxiation). I think I covered the most obvious requirements, But a fully tested project would be probably beyond reach.
A passive C02 extinguisher that floods the room in case of overheat would be probably sufficient, it's cheap, available to buy on the net but is it failsafe and without risk of false positives?
What do you think?