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Sizing Hidden radiators

The Steam Whisperer (Formerly Boilerpro)
The Steam Whisperer (Formerly Boilerpro) Member Posts: 834
in Strictly Steam
I have a couple that the numbers just don't seem right.   A 6 x27 horizontal duct feeds the radiator, the ductwork at the radiator is 36 x 32.  The steam supply is 1 inch with a 3/4 inch Moline (orificed) supply valve.  Using the cold flue size I come up with 162 EDR.....sounds like way too much.  Any Ideas?

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Comments

  • Dave in QCA
    Dave in QCA Member Posts: 1,788
    comparison

    I have a couple that are about the same. Inlet duct on one is 5 x 32, the other is 6 x 30. From opening the boxes and measuring the sections and comparing to EDR of sun indirects in the library, I know that mine are 165 edr.
    Dave in Quad Cities, America
    Weil-McLain 680 with Riello 2-stage burner, December 2012. Firing rate=375MBH Low, 690MBH Hi.
    System = Early Dunham 2-pipe Vacuo-Vapor (inlet and outlet both at bottom of radiators) Traps are Dunham #2 rebuilt w. Barnes-Jones Cage Units, Dunham-Bush 1E, Mepco 1E, and Armstrong TS-2. All valves haveTunstall orifices sized at 8 oz.
    Current connected load EDR= 1,259 sq ft, Original system EDR = 2,100 sq ft Vaporstat, 13 oz cutout, 4 oz cutin - Temp. control Tekmar 279.
    http://grandviewdavenport.com
  • The Steam Whisperer (Formerly Boilerpro)
    The Steam Whisperer (Formerly Boilerpro) Member Posts: 834
    Thanks.....

    If they are actually 162 EDR @ 70 air temp, I would expect the output would be much higher if they are heating -10F outdoor air......something I suppose I need to  watch out for.

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