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Cast Rads

S Davis
S Davis Member Posts: 491
in THE MAIN WALL
I am looking for BTU ratings for cast Rads at low water temps 90 to 130 degrees anyone know of a chart for this?

Thanks,


S Davis

Apex Radiant Heating

Comments

  • Lurker_2
    Lurker_2 Member Posts: 123
    Try Burnham's \"Heating Helper\"

    I think it goes down to around 110 degrees or so.

    You can google for "htghelper" to find it online.

    -Michael
  • S Davis
    S Davis Member Posts: 491
    Cast Rads


    Michael,

    Thanks I had the book on the book shelf, but did not think to look at it.


    S Davis

    Apex Radiant Heating
  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928
    Serious Doubts About That Table

    It's just a bit of a continuation of the "standard" table showing output dropping to 0 at 95° surface temp in a 70° room. ABSOLUTELY IMPOSSIBLE!!!

    Under constant circulation and TRVs I have some rads in my house that NEVER exceed 95° while maintaining 68° room temp.

    1.5 btu/hr/sqftEDR/degree of temp difference seems to work well for low temps. e.g. 95° rad in 70° room = 37.5 btu/hr/sqftEDR.

    This number served VERY well using a traditional cast iron boiler. When I changed to a Vitodens, average radiator temps dropped. I appear to be getting outputs as high as 3½ btu/hr/sqft/degree temp difference. The "why" and the "how" of this leads me to very strange ideas.

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