HHV and LHV
HHV and LHV
(OP)
Hi,
Fuel energy content are usually given in HHV and LHV. I know that by using HHV in boiler efficiency calculation assumes that water is condensed (energy is recovered) and by using LHV, energy is not recovered and is lost to the stack.
Can anyone advise on when do one use HHV or LHV to calculate boiler efficiency? Does it depend on the fuel used or the type of boiler (non-condensing or condensing)?
Why does boiler eff calculation used HHV instead of LHV in natural gas? Can it applies to diesel which have sulphur in it?
Thanks
Fuel energy content are usually given in HHV and LHV. I know that by using HHV in boiler efficiency calculation assumes that water is condensed (energy is recovered) and by using LHV, energy is not recovered and is lost to the stack.
Can anyone advise on when do one use HHV or LHV to calculate boiler efficiency? Does it depend on the fuel used or the type of boiler (non-condensing or condensing)?
Why does boiler eff calculation used HHV instead of LHV in natural gas? Can it applies to diesel which have sulphur in it?
Thanks





RE: HHV and LHV
LHV efficiency is best used with fuels that are either wet or which generate a lot of water during combustion, such as natural gas , wood, MSW. Characterizing and comparing different boilers based on LHV is much easier in the case where a wet fuel is being evaluated. For example , a boiler firing waste wood is much easier to review via LHV for the cases of 19% , 35%, 50% , 60% water content of the wood .
"Whom the gods would destroy, they first make mad "
RE: HHV and LHV
RE: HHV and LHV
Combustion turbines are frequently rated on LHV basis.