Battery Room Ventilation Fan
Battery Room Ventilation Fan
(OP)
I understand hydrogen is generated during battery charge mode and the generation will stop after switching off the charging current. My question is if the ventilation fans can be turned off at this moment? You may say hydrogen gas is still trapped in the plates and inside the cell and may come out to the atmosphere slowly. But what if the prior charging is just a float one, hydrogen emission is not much and there was continuous ventilation going on until the moment.
And after this moment, if the battery is in discharge mode, will the residual hydrogen recombines with the H2O or new hydrogen will be generated? I am talking about a critical situation, when the battery is in discharge mode, AC may be completely lost. If I need to provide ventilation fan, the power has to be from the battery itself, which is not preferred.
Any comments are appreciated.
And after this moment, if the battery is in discharge mode, will the residual hydrogen recombines with the H2O or new hydrogen will be generated? I am talking about a critical situation, when the battery is in discharge mode, AC may be completely lost. If I need to provide ventilation fan, the power has to be from the battery itself, which is not preferred.
Any comments are appreciated.






RE: Battery Room Ventilation Fan
RE: Battery Room Ventilation Fan
Submarines do have DC vent fans for the battry compartment.
For a small UPS battery in a large room, maybe not much risk. For a large battery bank in a small space, I would want air flow constantly and maybe some H2 sensors.
RE: Battery Room Ventilation Fan
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: Battery Room Ventilation Fan
RE: Battery Room Ventilation Fan
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: Battery Room Ventilation Fan
RE: Battery Room Ventilation Fan
RE: Battery Room Ventilation Fan
This will depend entirely on the installation. If adequate natural ventilation is provided, dedicated fans may not even be necessary. The key is to keep hydrogen concentration at a low level.
David Castor
www.cvoes.com
RE: Battery Room Ventilation Fan
RE: Battery Room Ventilation Fan
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: Battery Room Ventilation Fan
Is this scenario possible ?
RE: Battery Room Ventilation Fan
RE: Battery Room Ventilation Fan
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: Battery Room Ventilation Fan
RE: Battery Room Ventilation Fan
Aleman, can you indicate where it say's you do not need explosion proof equipment?
RE: Battery Room Ventilation Fan
I will not go into the details of calculating the formation rate of hydrogen or the rate of natural ventilation although both are reasonably well documented.
See the commentary of the 2008 NFPA NEC Handbook on this issue.