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Some thoughts on boiler efficiency

bob_46 Member Posts: 813
Recent posts have related to measuring boiler thermal efficiency. I have doubts that this can be done with any degree of accuracy outside of a laboratory. To start with we need to know the input accurately. Gas meters measure volume not weight. A one inch change in the barometer will change the BTU / CU.FT. content of natural gas 3.25%. Next we need to know the flow rate through the boiler accurately. With a 5 GPM flow rate an error of .1 GPM will change our result 2%. Next is ∆T , a 1ºF inaccuracy equals 5%. I have found that even small changes in thermometer well location can effect temperature readings. Now if you figure in possible stacking error where are we? Happy New Year. bob


  • Mark Eatherton
    Mark Eatherton Member Posts: 5,853
    We're close

    enough for the girls WE go with :-) Point taken.

    Happy Gnu Ears to you as well robert.

    ME (headed for Heeney)
    It's not so much a case of "You got what you paid for", as it is a matter of "You DIDN'T get what you DIDN'T pay for, and you're NOT going to get what you thought you were in the way of comfort". Borrowed from Heatboy.
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