Exhaust Strategy for Garbage Room and Corridors

[BIPVguy]

Dear all,

I would kindly ask for an information please...

1) Situation: Typical floor with staircase, lift lobby, studio apartment and garbage room. studio will be conditioned via Fan coils where fresh air is treated and supplied from air handling unit to back of FCU. FCU recircuates room air. Exhaust is provided via bathroom with ratio of 95% of supplied fresh air into a zone. Rules of thumbs suggest 10ACH exhaust rate. If I comply with this concept, I will exhaust much less than 10ACH e.g. 2-3ACH.

In lift lobbies I have similar concept. Fresh air is supplied to lift lobby and exhausted via garbage rooms (exhaust ratio is 95% of supplied fresh air). Again ,Rules of thumbs suggest 10ACH exhaust rate. The idea is to maintain garbage room under pressure to prevent odour escaping garbage room and entering lift lobby via cracks etc. If I comply with this concept, I will exhaust much less than 10ACH e.g. 2-3ACH. In both cases, FCU covers sensible cooling loads.

My question is....Shall I comply with 95% exhaust strategy regardless of recommendations or 10ACH strategy?

 

[trashcanman]

I would treat the garbage room just like a bathroom. 2 CFM/sq.ft., minimum. If the trash is picked up just once/week, make it 3 or 4 cfm/sq.ft. You don't want those odors invading the apartment. However, if fish heads are trashed, all bets are off, use 15-20 air changes/hr. Lots of unknowns.

 

[ChrisConley]

You mentioned a FCU for sensible loads. Another strategy for the garbage room (since you have cooling ) is to keep the room intentionally cold. The colder the room, the slower the decompotion and the lower the smell.

In this case, because you can't get rid of the smell no matter what you do, I think that pressure control is more important than rule of thumb ACH, but I agree with trashcanman (and who wouldn't given the name and subject) that 2 cfm/sqft is a minimum.

 

[quark]

I agree with the above two posts. I don't have experience with garbage rooms but I designed many change rooms. I generally go with 20ACPH (and it generally corresponds to 3cfm/sqft if the room height is 10ft). I would compare garbage area to shoe racks in the change rooms and even at 20ACPH we require separate air flow through the racks, if one doesn't like the stinking shoe smell.

You should better exhaust the garbage rooms.

 

[BIPVguy]

Thanks for your prompt reply.
Unfortunately, our project has been canceled at the end of scheme design stage.
I guess it is due to current issues in world economy.