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Vapor System

Jim Armstrong
Jim Armstrong Member Posts: 10
in THE MAIN WALL
Great! I never have. Now certainly never will.

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  • Jim Armstrong
    Jim Armstrong Member Posts: 10
    Vapor Sizing

    Recently I've heard that when you size a boiler for a vapor system based on a radiation calc. it is necessary to downsize the boiler EDR output by 20% to prevent short cycling. Is this true? For example if the Sq.Ft.EDR based on radiator sizing = 200, instead of needing a boiler that puts out a minimum of 250 sq. ft. EDR (200 + 20% for piping loss) a boiler less than 200 would be needed in cases of vapor systems?

    How about a little help?
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,600
    It should be

    radiation plus 1.33 for the piping. In the case of older systems where the insulation is gone (and not being replaced) you should use a 1.5 pick-up factor for the piping.
    Retired and loving it.
  • Jim Armstrong
    Jim Armstrong Member Posts: 10
    Answer would be?

    So then it is not necessary to downsize the radiation when dealing with vapor systems.
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,600


    > So then it is not necessary to downsize the

    > radiation when dealing with vapor systems.



    Retired and loving it.
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,600
    That's correct.

    Retired and loving it.
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