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Do I need to rethink?

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by Armaton, Oct 10, 2012.

  1. Armaton

    Armaton Member

    Joined:
    Aug 22, 2011
    Messages:
    102
    Loc:
    Hastings, Michigan
    All the discussion about Mass Heat's system has me concerned with my install. Have most of the parts and was going to dig the trench. Butttttt! Real quick, heat loss calc via online calculator comes to approx 40-45kbtu for infloor basement and WAHX, DHW will add but EWD factored for it. Would ask him, but he isn't using the site any longer and hasn't answered email. EKO 40, 850 gallons pressurized storage in pole barn, with 60 gallon buffer tank in house. 260 foot roundtrip to barn. Figured 70kbtu total load with DWH so 7gpm for flow at a delta of 20. Warmest water sent back to storage would be 140 degrees due to buffer reusing water over and over down to 140. Was going to use Rehau 1 1/4 just to make sure, but after reading an old thread about how we always seem to overkill I decided on the 1" that EWD said is all I needed. So if my Delta is at least 40 degrees, and I use 1" Rehau (Thermopex), and have 7 gpm I should be good. Right?

    Brandon

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  2. Chris Hoskin

    Chris Hoskin TarmSalesGuy

    Joined:
    Aug 29, 2008
    Messages:
    419
    Loc:
    Lyme, NH
    what will you be using for a pump?
  3. Armaton

    Armaton Member

    Joined:
    Aug 22, 2011
    Messages:
    102
    Loc:
    Hastings, Michigan
    Have 15-58FC's on infloor and several extra's, so thats what I was gonna use. Thought they would easily move enough water.

    Brandon
  4. DaveBP

    DaveBP Minister of Fire

    Joined:
    May 25, 2008
    Messages:
    1,047
    Loc:
    SW Maine
    Siegenthaler's Hydronic Simulator software says using 260 ft. of 1" PEX alone with a Grundfos15-58 on speed 3 will flow 6.53 GPM.
  5. Chris Hoskin

    Chris Hoskin TarmSalesGuy

    Joined:
    Aug 29, 2008
    Messages:
    419
    Loc:
    Lyme, NH
    DaveBP, what happens to that calc if Armaton goes with 1 1/4" PEX?
  6. BoilerMan

    BoilerMan Minister of Fire

    Joined:
    Apr 16, 2012
    Messages:
    1,497
    Loc:
    Northern Maine
    6 and a half gallons is not much....... only if you can maintain that 40 degree delta. Bigger pipe and a smaller circulator or the circ turned on 1 or 2 instead of 3.

    TS

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