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Steam vs Hot Water

BRIANJ
BRIANJ Member Posts: 118
in THE MAIN WALL
Can anyone tell me why EDR is the same for Steam and Hot Water if Steam is at 212 and water is 180?

Thanks Brian

Comments

  • Ted_4
    Ted_4 Member Posts: 86
    EDR

    EDR refers to the size in square feet of the radiant surface, not the heat output. Heat output for a given EDR varies according to the operating temperature. One square foot of radiation in a steam system puts out about 240 btu per hour. In a water system at 170 degrees, one square foot puts out about 150 btu per hour.
  • Noel
    Noel Member Posts: 177
    It isn't

    The square feet of surface area is the same (EDR) number, but the output is 240 BTUH per sq.ft. of EDR at 212° F., and 170 BTUH per sq. ft. of EDR at 180° F.

    Noel
  • BRIANJ
    BRIANJ Member Posts: 118
    Steam vs Hot Water

    Ted and Noel, Thanks for your help in explaining this to me. I appreciate your replying so quickly. Thanks again.
    Brian
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