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EDR / BTU's steam / hot water

Steve_210
Steve_210 Member Posts: 647
in Strictly Steam
When I measure up an existing radiator and calculate the EDR, I know you multiply by 240 to get the BTU's for steam. But for hot water I believe you multiply the EDR by 150 for 170 degree hot water - I seem to remember reading this in one of Dan's books - can anyone clarify?

Comments

  • Steamhead
    Steamhead Member Posts: 17,380
    That's right

    assuming you're working with a max boiler temp of 180° F.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
  • Brad White
    Brad White Member Posts: 2,399
    Correct, and

    keep in mind that the reference temperature (the 170F) is the "average" water temperature. This is what Steamhead is saying, re: 180F supply water, but presumes a 20 degree drop.



    If you size for condensing boilers using 140F maximum supply (Say 130F average assuming 120F return), you get about 90 BTUH per EDR.
    "If you do not know the answer, say, "I do not know the answer", and you will be correct!"



    -Ernie White, my Dad
  • Steve_210
    Steve_210 Member Posts: 647
    thanks

    thanks guys
This discussion has been closed.

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