Ventilation/Air-conditioning system for battery room
Ventilation/Air-conditioning system for battery room
(OP)
hello,
I just found this site helpful and I hope you guys can help me too.
I am not familiar with the air-conditioning system and exhaust fans.
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 battery room.
Is it possible that the design for the battery room is having an exhaust fan and 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?
What kind of air must be inputed to the A/C?
Battery emits hydrogen gas and has a lower explosion limit of 4% by volume. I'm just afraid that there will be a tendency that some H2 gas will go through ducts and accumulate inside the ducts and to the A/C. Though battery type is AGM that emits minimum H2 gas, I'm still afraid if this is a possible design based on standards.
Please advise me. Thanks!
I just found this site helpful and I hope you guys can help me too.
I am not familiar with the air-conditioning system and exhaust fans.
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 battery room.
Is it possible that the design for the battery room is having an exhaust fan and 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?
What kind of air must be inputed to the A/C?
Battery emits hydrogen gas and has a lower explosion limit of 4% by volume. I'm just afraid that there will be a tendency that some H2 gas will go through ducts and accumulate inside the ducts and to the A/C. Though battery type is AGM that emits minimum H2 gas, I'm still afraid if this is a possible design based on standards.
Please advise me. Thanks!
RE: Ventilation/Air-conditioning system for battery room
RE: Ventilation/Air-conditioning system for battery room
RE: Ventilation/Air-conditioning system for battery room
RE: Ventilation/Air-conditioning system for battery room
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RE: Ventilation/Air-conditioning system for battery room
Design a passive exhaust system to be activated when the H2 sensors alarms at 1% or 2% H2 concentration by volume and also shut down the AC system.
During normal operation the room can be 100% recirculated.
A simple formula we use to calculate the minimum required exhaust CFM is:
CFM = G / P / 60
where:
G = Gassing rate of batteries at worst case condition [ft^3/hr](gassing rate provided by battery MFR)
P = Maximum percentage of H2 concentration allowed. (Our local codes mandates a 1% or P = 0.01)
RE: Ventilation/Air-conditioning system for battery room
RE: Ventilation/Air-conditioning system for battery room
Can the materials around the area handle this?
B.E.
RE: Ventilation/Air-conditioning system for battery room
Though A/C unit cannot be shutdown as it is required to maintain the room temperature for the battery.
Usually, one air flow is used for battery rooms and discharged all air outside. But in this case, large capacity of A/C unit is needed. So to save energy and to reduce the capacity, air is recirculated. Unfortunately, H2 is mixed with air.
Is it possible to have a valve in the duct to close if set percentage of hydrogen is reached then discharge it into the air? And open it once H2 level goes down?
Is it allowed and safe for operation?
Thank you for your time.
RE: Ventilation/Air-conditioning system for battery room
RE: Ventilation/Air-conditioning system for battery room
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RE: Ventilation/Air-conditioning system for battery room
Thank you guys for your help and God bless!!