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ruggercsc

Supply air termination at windows

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I have been working on Design Build multi-family and lodging facilities for a number of years and the issue of  where to terminate the supply air in bedrooms always comes up.  Some of our consulting ME's are insistent on terminating the supply near the windows, while others are a lot less concerned about it.  I always thought the old school way of thinking was windows were drafty/leaky and you needed the air supply to terminate there to account for this.

This topic comes up at just about every Constructibility and VE meeting. Ten feet of duct is not a big deal, but 10' x No. of bedrooms x no. of units adds up on large projects.

 

Thanks in advance for any input on this.

 

 

Edited by ruggercsc

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I'm trying to imagine why it would matter.  From what perspective is this an issue?  Heating?  Cooling? Temperature gradient in the room?  Room air loss (I'm at a loss, clearly)??

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6 minutes ago, Audi driver, P.E. said:

I'm trying to imagine why it would matter.  From what perspective is this an issue?  Heating?  Cooling? Temperature gradient in the room?  Room air loss (I'm at a loss, clearly)??

You answered my question if you don't think it matters (the issue I am assuming is heating since it is in Colorado).  

 

 

 

 

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21 minutes ago, ruggercsc said:

You answered my question if you don't think it matters (the issue I am assuming is heating since it is in Colorado).  

 

 

 

 

I don't think it does, but I don't know what the concern might be either.

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54 minutes ago, Audi driver, P.E. said:

I don't think it does, but I don't know what the concern might be either.

Project is a extended stay hotel in Colorado (studio type rooms).

Potential issue is the "elimination of the convection loop" at the window if the conditioned air supply is moved away from the window and into the interior of the room due to VE exercise to move the supply air away from windows and terminate in soffit at kitchen to save on duct work.  Argument is that once a heavy curtain is pulled shut at window, the convection loop is essentially eliminated anyway.  

Any thoughts?

 

 

 

 

 

 

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How big are the rooms?  I would think any effect would be pretty negligible.  10 ft can't make that big a difference, particularly if the air flow is correct for the room size and heating/cooling effects.

Edited by Audi driver, P.E.

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13 hours ago, Audi driver, P.E. said:

How big are the rooms?  I would think any effect would be pretty negligible.  10 ft can't make that big a difference, particularly if the air flow is correct for the room size and heating/cooling effects.

Rooms are typically 23' x 16.5'.  Duct length savings is 10' +/- with easier ceiling installation without the ductwork.

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