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  1. Replies
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    oops

    Okay, I didn't really want to get into the details of the valve anyway. What I really want to talk about is flow problems that might occur, and controls.
  2. Replies
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    i meant to link to this valve

    Sites that direct sell, or post prices are not allowed to be linked to
    Or something similar to this, I should say. I haven't dug into the details of valve selection just yet. At those point I'm just...
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    contacting a pro

    As an HVAC designer myself, I like to have a good idea what I want done before having a contractor out to tell me I need more than I really do. You're right, I linked to the wrong valve, that was the...
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    zoning an existing hydronic system

    I'm considering making some modifications to my hot water heating system with cast iron radiators, to have some zone control. There are only 2 people living in the house, and there's no reason to...
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    oh, so I forgot to mention the most important...

    oh, so I forgot to mention the most important part... to answer your original question, over sizing (as in going from a 3.5 ton to a 5 ton unit) will have NO effect on the airflow in your loft. 1 ton...
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    If I were a betting man I'd tell you that the...

    If I were a betting man I'd tell you that the contractor wants to sell you a bigger system because that's how he makes his money!

    Attics are going to be hot because heat rises. How much that...
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    Some more accurate math... 96 sq inches of duct...

    Some more accurate math...
    96 sq inches of duct relates the volume of air pushed through it (which is whatever the fan pushes and is not a function of duct size) to the speed of the air (given in...
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    760 CFM in a 12x8 duct puts you at about 0.2...

    760 CFM in a 12x8 duct puts you at about 0.2 inches of pressure loss per 100 feet of duct. Ideally you'd be at 0.1 inches, but if your duct runs are short enough (as they likely are in a 1000 sq ft...
  9. So the guys hvac pro forums (google it, it won't...

    So the guys hvac pro forums (google it, it won't let me post a link) have convinced me that it isn't the air temperature that matters but the radiant heat transfer from the sun to the coil itself,...
  10. Sunlight must heat the air, why else would it be...

    Sunlight must heat the air, why else would it be hotter during the day than it is at night? The question is how fast does this happen? If the process is sufficiently slow, the air on the shaded side...
  11. My understanding was that it was moving all that...

    My understanding was that it was moving all that air to keep the condensing coil cool. If it didn't blow the air away it would get too hot and the difference in temperature between the evaporator and...
  12. why not?

    why not?
  13. Yeah I have read that building a cover over the...

    Yeah I have read that building a cover over the unit can cause hot air to accumulate around the unit rather than blow away, but what about just putting it on the north side of the building rather...
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    I used http://www.greenexamprep.com The practice...

    I used http://www.greenexamprep.com
    The practice tests were pretty good. Ultimately you just have to focus on memorizing the credits. It's a terrible test that does not test your knowledge of...
  15. relationship between C.O.P. and outside air temperature

    Since the efficiency of an air conditioner is a function of outdoor air temperature, does it follow that you will get better efficiency if you put the condenser under some sort of cover to keep the...
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    duct shops in philadelphia

    I'm looking for spiral duct to run exposed, which they don't sell at the big box stores. Where could I get it?
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    I'd have to tear it apart to figure out the size...

    I'd have to tear it apart to figure out the size of the wheel. I calculate 1.6" loss using 6" round or 0.83" with 7" and 0.47" with 8". Does that sound right to you? I think I'm just going to use 8"...
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    It's not listed in any of the literature that...

    It's not listed in any of the literature that came with the hood. I have not yet looked at the fan manufacturer to try to find the fan curve.
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    correction: I have 6 90 degree turns, not 5

    correction: I have 6 90 degree turns, not 5
  20. Replies
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    Ask away, my friend. I am regretting not planning...

    Ask away, my friend. I am regretting not planning this out more ahead of time so I could have asked some of the guys at the office for advice before getting started (today). I think the answer to my...
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    kitchen exhaust duct size

    I am an HVAC designer but this is a question about an installation I am doing in my own house. I'm putting in a kitchen exhaust hood that is 480 CFM with a 6" round duct connection. I've never...
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