31 Aug 06 0:10
I am just new on my job and I usually deal with batteries.
I hope you can help me on this situation.
There's a battery room that will be designed to have a forced ventilation ( using exhaust fan ) and air-conditioned to maintain the temperature within the room and to exhaust H2 gas.
The battery is an AGM type. I already computed the hydrogen concentration in the room based on EN standard and it shows 0.04% hydrogen concentration. And the time for the critical hydrogen concentration to accumulate (without ventilation) is within 6 hours. The room is to have 3 ACH (air-change per hour). (Actually, 1 ACH is enough but owner wants it to have 3 ACH.)
The problem is that the design for the battery room is having its exhaust air, 80% of it, will be recirculated through ducts as an input for A/C, while the remaining 20% of exhaust air will be drawn out from the room. Is there any standard that allow this kind of design?
Is it possible?
There's a tendency that some H2 gas (80%)will go through ducts and accumulate inside the ducts. If I will provide hydrogen gas sensor inside the ducts to monitor the percent concentration, I still doubt if recirculation is permitted for battery rooms.
Please advise me. Thanks! :)