Multi level space
Multi level space
(OP)
Hi All,
I'm an Architect working on a project that has a multi-story space, small mezzanine above a large living room, which is above a large cellar. All are open to each other. Our HVAC engineer is showing supply cooling along the perimeter ceiling at the mezzanine level. My worry is that the cold air will settle at the first floor and/or cellar and the hot air will rise, filling up the mezzanine and leave it feeling uncomfortable.
I am being assured that the system will be balanced and that the falling cold air from the ceiling will cause a convective loop that will thoroughly mix the air in the entire space. This makes some sense but does not seem, to me, a thorough enough strategy to rely on. It seems like the convective loop would almost be negligible in terms of mixing the air.
Anyone out there have two cents to throw into this?
Thanks,
Tyler
I'm an Architect working on a project that has a multi-story space, small mezzanine above a large living room, which is above a large cellar. All are open to each other. Our HVAC engineer is showing supply cooling along the perimeter ceiling at the mezzanine level. My worry is that the cold air will settle at the first floor and/or cellar and the hot air will rise, filling up the mezzanine and leave it feeling uncomfortable.
I am being assured that the system will be balanced and that the falling cold air from the ceiling will cause a convective loop that will thoroughly mix the air in the entire space. This makes some sense but does not seem, to me, a thorough enough strategy to rely on. It seems like the convective loop would almost be negligible in terms of mixing the air.
Anyone out there have two cents to throw into this?
Thanks,
Tyler





RE: Multi level space
Is that the level of the underside of the mezzanine - the "ceiling" of the first floor, or the ceiling above the mezzanine?
RE: Multi level space
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RE: Multi level space
RE: Multi level space
Not that the loop will exist in the thouroughly mixed air condition but that it will create the mixed condition.
RE: Multi level space
RE: Multi level space
you did not mention which type of air supplying terminal is to be used, but in general the most important thing is that engineer makes provisions for in-field balancing within some range, so that system can be somewhat adjusted to what will be observed during start-up at load.
RE: Multi level space
If the return air is in the cellar, you are just going to get a cascade of cold air from those slots dropping to the cellar, with a pool of hot air at your Mezzanine level.
You may have better results if your return air is in the ceiling to strip off the hot air.
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: Multi level space