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  1. #1
    Join Date
    Jan 2011
    Location
    Doylestown, PA
    Posts
    2

    Question Exposed Round Duct

    We are getting a geothermal system put in our house in Eastern PA. We have a large Solarium we wanted added to the system since it wasn't heated or airconditioned. We asked for exposed round duct in that room. Our contractor is concerned about all the direct sun exsposure that will hit the ducts. He feels they are going to sweat. I know sweating has more to do with humidity. Does anyone else feel that the ducts being exposed to so much sun will create sweating? Thanks

    I attached a picture (hopefully). The duct is going mid level between the balcony and the doors to the first floor. It will be mounted to the brick wall.
    Attached Images Attached Images  
    Last edited by AMDAVN; 01-03-2011 at 11:13 AM. Reason: added picture

  2. #2
    Join Date
    May 2008
    Location
    Missouri
    Posts
    3,537
    I'm assuming you want this solarium to be the same temperature as the rest of the house? Also noticed large grill above small balcony. Is this a discharge from this same system? Your contractor will need to do an actual heat loss/gain computation (manual J) and see if the new system will be large enough. If he installs an exposed "pipe" and it is not adequate to actually condition the area, then there is a chance it may sweat. Based on your picture, this room could have a significant loss/gain total and may require an additiional GSHP system just to condition this area properly. Your contractor is right to be concerned. We have actually had "sun rooms" and solariums which took a system nearly as large as the main house by themselves. Most people don't or won't spend the extra money to do it properly. Usually it's a "just need a little more out there" type request, and when it does not work at all, it's the contractor's fault somehow. Make sure he runs the figures before getting any additional ductwork installed, and be prepared for a shock. It's hard to "count" this solarium as living space if it is not conditioned, but based on your picture this won't be cheap, or easily done.

  3. #3
    Join Date
    Feb 2010
    Location
    Cal
    Posts
    1,596
    Spiral duct, lined on the inside is available and should be able to offset sweating. Get a firm figure for the room load or you'll be sorry. Return path needs to be figured out too, or you may impose solarium loads on adjoining rooms.

    You might be able to lessen the room heat concentrations with substantial return volumes in the solarium, but then again, you may upset the whole house comfort in the process. A couple thousand cfm of return/displacement can do more local work than a couple hundred cfm of supply. Can't tell over the internet what your options and opportunities are, so you need to rely on your contractor to do what's best.

    Either way, the load needs to be accounted for in system capacity.

    Window coverings/films will go a long way in reducing A/C loads too. Solve window problems with window solutions, then make up the gap with the equipment.

  4. #4
    Join Date
    Jan 2011
    Location
    Doylestown, PA
    Posts
    2
    Quote Originally Posted by wahoo View Post
    I'm assuming you want this solarium to be the same temperature as the rest of the house? Also noticed large grill above small balcony. Is this a discharge from this same system? Your contractor will need to do an actual heat loss/gain computation (manual J) and see if the new system will be large enough. If he installs an exposed "pipe" and it is not adequate to actually condition the area, then there is a chance it may sweat. Based on your picture, this room could have a significant loss/gain total and may require an additiional GSHP system just to condition this area properly. Your contractor is right to be concerned. We have actually had "sun rooms" and solariums which took a system nearly as large as the main house by themselves. Most people don't or won't spend the extra money to do it properly. Usually it's a "just need a little more out there" type request, and when it does not work at all, it's the contractor's fault somehow. Make sure he runs the figures before getting any additional ductwork installed, and be prepared for a shock. It's hard to "count" this solarium as living space if it is not conditioned, but based on your picture this won't be cheap, or easily done.
    The existing grill is from the old system and will be removed. We are installing a unit just for this room and it going in a new mechanical closet below the second floor overhang seen in the picture.

    Thanks for the info

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,120
    They make insulated spiro duct.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  6. #6
    Join Date
    Jul 2007
    Location
    Delaware
    Posts
    3,824
    Get that canvas duct that blows up full to a round shape when the system fan comes on. Neat stuff.
    Always here

  7. #7
    Join Date
    Mar 2007
    Location
    Myrtle Beach, SC
    Posts
    2,919
    Quote Originally Posted by energy star View Post
    Get that canvas duct that blows up full to a round shape when the system fan comes on. Neat stuff.
    That stuff can make a loud noise when the system comes on.

    Check this link:

    http://contractingbusiness.com/servi...51/index.html#
    Remember, Air Conditioning begins with AIR.

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