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  1. Replies
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    Chilled beams

    First- research what, exactly, these "chilled beams" are. What you'll likely find is thay are an updated version of the old 1960 Carrier ceiling mounted induction unit. They DO NOT provide any sort...
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    Surprised to see this thread still popping up...

    Surprised to see this thread still popping up after a year. Thanks to some for the feedback, although most of the comments still "sound" like the same sales hype we are getting from the sales reps...
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    Staple-up radiant floor heating

    You'll be hard pressed to get local help around Gabriola Island - I'm in Vancouver and it's tough finding any decent radiant guys around here, although my scope is mainly large commercial system...
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    Or look at your budget for the geo, and see how...

    Or look at your budget for the geo, and see how much money you can spend out of that with upgraded high performance windows, police up all the infiltration and cracks, add more roof and wall...
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    It's always interesting to see the second...

    It's always interesting to see the second guessing that goes on, but always, always start with the initial load calculations, building occupancy numbers, and basics, Like CXAgent's Post. A lot of...
  6. UK Building Services

    Start here: http://www.cibse.org/ and then start googling- they have much more stringent Codes and Design Standards over there, plus all the local jurisdictions with their own spins on the Carbon...
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    Yes, that would be the High school in South...

    Yes, that would be the High school in South Richmond. I don't recall what issues there were on THAT one during backfilling that I may have mentioned - there was another project in Richmond - the...
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    McQuay Templifier

    They are also known as a heat pump chiller- basically a glorified heat recovery chiller with a reversing valve for the refrigerant cycle so they can be used for heating and cooling in a water source...
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    Yes, I am

    I only drop in here from time to time. I still exist, at least the bills still get mailed to me.
  10. Don't forget the mean radiant temperature from...

    Don't forget the mean radiant temperature from building surfaces, especially around the crappy perimeters on most buildings. In a cold climate, the inside surface of a double glazed window can be...
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    Depending on your location YES, you can do both...

    Depending on your location YES, you can do both radiant heating and radiant cooling from the same system. The key is that the most effective, economical, and lowest energy use HVAC system is the...
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    Why not use electric radiant ceiling panels? No...

    Why not use electric radiant ceiling panels? No baseboard fin to collect munge and dirt, clean installation, and more comfortable. Try these:
    http://www.thermalinc.com/comfort/cp.htm...
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    Is there any way you can reduce the cooling...

    Is there any way you can reduce the cooling loads? That is the biggest task- reduce the loads first by working with the Architect and controlling solar gains and other heat gains to the space.
    ...
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    Depends on the right numbers being used. If you...

    Depends on the right numbers being used. If you used the insulation value of the roof and walls straight-up, there may be a significant error depending on how much thermal bridging there is in your...
  15. Thread: geothermal heat

    by gmcd
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    708

    Illinois: heating dominated climate, which means...

    Illinois: heating dominated climate, which means the geo-exchange system will have to do way more heating over the year compared to cooling. Therefore the geo-exchange side (ground side system)...
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    My stuff is all hydronic heating and cooling...

    My stuff is all hydronic heating and cooling coils, no gas sections. The only controls connections are to the VFD's running the supply and exhaust fans. Simple.

    We specified the normal neoprene...
  17. Insulate your warehouse. And I'll bet the slab...

    Insulate your warehouse. And I'll bet the slab on grade wasn't insulated either. Do a blower door test and seal up all the air leakage cracks. Check out the "Solarwall" product for ventilation air...
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    Just had five of them planted on a roof a couple...

    Just had five of them planted on a roof a couple months back- custom heat recovery ventilators in the 5,000cfm to 10,000 cfm range. The only issue I had was that we specified coated acoustic...
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    The most energy efficient HVAC "systems" used in...

    The most energy efficient HVAC "systems" used in Europe are high performance windows, better wall details to eliminate thermal bridging, and exterior solar shading. The whole idea is to reduce the...
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    I'd also suggest the Building Science websites at...

    I'd also suggest the Building Science websites at http://www.buildingscience.com/bsc/ as well as the PassivHaus design approach here: http://www.passivhaus.org.uk/ Do some serious research and...
  21. Thread: Fabric Ductwork

    by gmcd
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    2,219

    The reason I can so quickly "find" those things...

    The reason I can so quickly "find" those things out is that I have an extensive library on radiant systems, and DOAS systems, and I've corresponded with Dr. Mumma in the past, and have his website on...
  22. Thread: Fabric Ductwork

    by gmcd
    Replies
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    2,219

    That's from Dr. Mumma's website at Penn State...

    That's from Dr. Mumma's website at Penn State University, it's not software, it's a screen-shot from their local DDC controls system that shows the DOAS operations graphic. You can use regular air...
  23. Thread: Fabric Ductwork

    by gmcd
    Replies
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    2,219

    Kurrodo- I know how radiant slabs and CCC works -...

    Kurrodo- I know how radiant slabs and CCC works - been designing them for a lotta years now. It's just that the best combination when using a radiant ceiling emitter is to use a low level...
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    There are very limited choices for good radiant...

    There are very limited choices for good radiant slab simulation and calculation tools. This is one specific source:

    http://www.empa.ch/plugin/template/empa/*/5383/---/l=1

    Some high-end...
  25. Thread: Fabric Ductwork

    by gmcd
    Replies
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    2,219

    I'm not at work right now so I can't attach some...

    I'm not at work right now so I can't attach some sample pictures, but there are various ways of doing it:

    1. Cast supply air ducts in the slab to get to floor registers- use "Eccoduct" as it's...
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