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Steam to Water Heat Exchanger

Aidan (UK)
Aidan (UK) Member Posts: 290
in THE MAIN WALL
It's not 100%, but for all practical purposes it's near enough. The heat going in with the steam can only exit in the water, in the steam/condensate outlet or as losses from the casing. The only heat lost will be from the outer shell of the heat exchanger. If the condensate is dumped to drain, you'd have to calculate the heat lost with it.

There will be heat lost from the associated pipes and fittings, but that's a different matter. Every heat exchanger calculation I ever did assumed 100% heat transfer. The manufacturers may have detailed figures, but the real percentage is so small as to be negligible.

Comments

  • Mark Zoeteman_2
    Mark Zoeteman_2 Member Posts: 3
    Steam to Water Heat Exchanger

    How do you calculate the energy lost when transfering heat through a steam to water instantaneous shell and tube heat exchanger? It's not 100% because some of the energy is in the exiting condensate.
  • Ken_8
    Ken_8 Member Posts: 1,640
    Aidan's right

    The loss is on the order of 970:1, meaning, It takes one BTU to make the water go from 211 to 212°F. It takes ~970 BTU's to make a pound of water change state (from water to steam or the other way around) Simply changing state from steam to water is where all the energy is/goes.

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