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cast iron radiators

Karl_5
Karl_5 Member Posts: 6
in THE MAIN WALL
What is the formula to determine the output per section of radiator at a temp lower than 160 degrees entering water and what gpm?

Comments

  • Big Ed
    Big Ed Member Posts: 1,117
    EDR

    1 square foot of radiation or one EDR puts out 130 BTUH @ 160* water temperture .Every 5* drop in water temperature the BTUH output drops by 10 BTUH . The question is what is the EDR of the radiator used ? I find Dan's book "EDR" very usefull with this problem. The book has just about all of the old radiator spec sheets...
  • Brad White_53
    Brad White_53 Member Posts: 7
    May I add to that?

    Minor yet critical detail to Ed's excellent answer: The temperature you use to rate a radiator is the average water temperature, (AWT) not the entering supply temperature.

    For example a radiator receieving 200 degree water leaving at 160 degrees has and AWT of 180. Same radiator would have the same output if you supplied 190 degree water and returned it at 170; same AWT you see.

    Entering water at 170 and leaving at 150 has an AWT of 160 as in Ed's example.
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