Small Space Ventilation
Small Space Ventilation
(OP)
A small interior room that needs ventilation - say 50CFM. What methods would you consider to provide ventilation?
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RE: Small Space Ventilation
RE: Small Space Ventilation
There is really not adequate information for design.
RE: Small Space Ventilation
heating only, 0F outside air and 70F inside.
Exhaust is easy. I am assuming that drawing in air from adjacent spaces in not adequate ventilation.
RE: Small Space Ventilation
If your syatem balance was equal SA and RA to start, you will now infiltrate 50 cfm of 0F air on a cold day with only an exhaust fan, or not if the building is tight.
50 cfm exhaust will make the room and building negative and you may take air from a space with worse problems than the room you are exhausting.
Still not enough information for design.......
RE: Small Space Ventilation
What kind of room is this small room? If it is a bathroom, then transfer air from the adjacent space is permissible according to the International Mechanical Code (2000). This air must be exhausted from the building.
If this isn't a bathroom, then I'll assume you're talking about a 50 CFM outside ventilation air requirement based on occupancy for this room. In this case, drawing in air from an adjacent space might work, but remember that the ventilation requirement is based on outside air. So the amount of air that you transfer into this small room will depend on the fraction of outside air that is in the supply air to the adjacent space. For example, if the supply air in the adjacent space is 20% outside air, then you will have to transfer 250 CFM into your small room to satisfy the requirement.
As mentioned above, overall system balance and heating/cooling loads must be considered. Of course, whatever amount you exhaust will have to be brought into the building, either at the air handler or through infiltration. You need to study the entire system to determine the best solution.
---KenRad
RE: Small Space Ventilation
it depends the ventilating requirements in the surrounding area also.
RE: Small Space Ventilation
it depends the ventilating requirements in the surrounding area also.
RE: Small Space Ventilation
that should mean the room is either toilet room or supplies storage or similar. in that case you generaly don't need fresh supply air, the simplest solution is to have exhaust (local or central, depending on main systems layout and configuration), and neighboring room should be positively pressuresized to provide air for that small room via door louvres (uni-directional type).
RE: Small Space Ventilation
RE: Small Space Ventilation
You can get split systems to turn the air over and cool....outside air is going to be a problem.
How small is a small office? 1 CFM/square foot with 8' ceilings will get the air changes up.