Some thoughts on boiler efficiency

bob_46

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

We're close

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

Happy Gnu Ears to you as well robert.

ME (headed for Heeney)