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    good question and I wondered the same. I grew up...

    good question and I wondered the same. I grew up in Germany near an area with Uranium mining. there they made a big deal of sealing of basements etc. to prevent radon from penetrating. but that...
  2. 1. If you really need a dehumidifier, put it in...

    1. If you really need a dehumidifier, put it in the lowest floor since that usually is colder and the dehumidifier adds heat (all the electricity it uses ultimately becomes heat plus the latent heat...
  3. humidifying to "just under condensation" is...

    humidifying to "just under condensation" is difficult with many thermal bridges as you have in buildings. And this also means you will be right under 100% RH at the perimeter wall. Some air also goes...
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    I'm not claiming to be an expert and you have...

    I'm not claiming to be an expert and you have experience in that, it seems and where you live they seem legal. I just wonder how you have so much less pipe length than with a water-based system? the...
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    you can make it work. but you have to live with...

    you can make it work. but you have to live with the fact that the water temperatures are further away from where you want them with the energy/wear penalty. If you dig deeper or make the field larger...
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    Unless I misunderstand, a closed loop system...

    Unless I misunderstand, a closed loop system would be placing a HX in the pond or stream. The loop from HX to HP is closed, the stream flowing around it would be open.
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    A horizontal system is only a few deep in the...

    A horizontal system is only a few deep in the ground. In winter it cools down quickly since no heat will travel to it from above. you will have large dT between summer/winter. If in winter you have...
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    good point. but during milder seasons i have the...

    good point. but during milder seasons i have the windows open every once a while anyway. So in residential application we wouldn't need extra ventilation besides makeup air for all the fans.

    Edit:...
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    I know DX geothermal exists and have been used...

    I know DX geothermal exists and have been used and in theory should perform better. But because someone installed them in the 1970's and got away with it doesn't make them legal today. At least...
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    as long as you stay above 20% or so it should be...

    as long as you stay above 20% or so it should be fine. Manufacturers are more concerned about too much humidity and corrosion.
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    it likely is required by code.

    it likely is required by code.
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    EPA/DNR won't allow refrigerant in the ground....

    EPA/DNR won't allow refrigerant in the ground. and the geo-piping isn't made for such high pressure. And filling miles of pipe with refrigerant isn't cheap.

    Never ever install a horizontal system.
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    Assuming besides humidity it also is warm, why do...

    Assuming besides humidity it also is warm, why do you reheat so high? This. wastes energy and causes discomfort. Are you at least re-heating with condenser heat? So now you have only temperature...
  14. the first thing (energy efficiency wise) to...

    the first thing (energy efficiency wise) to dehumidify would be to use an energy recovery ventilator to ventilate. this dries some of the fresh air. Seal the house to avoid infiltration.

    a...
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    You could have a gravity damper that keeps the...

    You could have a gravity damper that keeps the damper almost closed, but when thee is negative pressure (i.e. bathroom fan or dryer extracting air) it opens. My 2005 ENERGY STAR sealed house has...
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    I never would use any metal piping int he ground,...

    I never would use any metal piping int he ground, always some type of plastic. I don't think i know of any copper pipe geo system. All use some HDPE or other product specifically made for...
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    it sounds to me you de-humidfy in heating season...

    it sounds to me you de-humidfy in heating season since you reheat to 75 to 80F. ? can you maybe explain a bit what exactly you are doing there? i mean what is the objective (industrial drying, human...
  18. Thread: Insulated Vent?

    by kaleun
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    wood stove exhaust usually is hot enough to not...

    wood stove exhaust usually is hot enough to not condense. If it was a problem (like you have a low temperature boiler) you could use double-wall exhaust duct. (I'm not sure this is the correct word,...
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    I definitely would use a sealed combustion system...

    I definitely would use a sealed combustion system with direct vent (like your boiler likely has nowadays). when you don't do sealed combustion you will:

    -draw in cold air to make up combustion...
  20. Thread: how to start?

    by kaleun
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    Thanks for the compliment. I wouldn't even...

    Thanks for the compliment. I wouldn't even consider myself a pro, maybe need 1-2 more years. My history with the industry is as follows:
    - undergraduate degree in Environmental Engineering (in...
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    Personally I think you don't need to worry about...

    Personally I think you don't need to worry about humidity in a library unless you have collector's item books (like that 1500 year old bible) that you never check out. It is a waste of money and...
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    I'm not sure i fully understand your problem, but...

    I'm not sure i fully understand your problem, but the volume in the HX has not much to do with the flow rates.

    Did you verify all flow rates (via balancing valves)? How is the main loop pump...
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    Not really. the copper you dig up in a mine is...

    Not really. the copper you dig up in a mine is corroded copper (copper-oxide). Same as iron ore is not iron, but an iron oxide (=rust)

    Only noble metals (like gold) appear in pure form since they...
  24. Thread: how to start?

    by kaleun
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    I see... i had trouble posting in the ARPA open...

    I see... i had trouble posting in the ARPA open discussion forum (it would tell me i didn't have privileges to post) and therefore posted in AOP (in my desperation). It seems now I have privileges to...
  25. Thread: how to start?

    by kaleun
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    I was able to post.. but the posts were deleted....

    I was able to post.. but the posts were deleted. I did put some effort in the posts hoping to be able to help someone. I do realize here are areas where I can't post and those won't let me post right...
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