6 replies to this topic

[deltaChe]

How can I calculate LHV(low heating value)?
And what is LHV value apply for?

Thank you very much.

[demank]

LHV is the amount of heat released by combusting a specified quantity.
You can calculate from enthalpy data, heat of combustion, or from HHV data (HHV includes the heat of condensation of water in the combustion products.)

[breizh]

Hi HS ,
This link may support your query:

http://hydrogen.pnl....?canprint=false

Breizh

[ELEMAN]

Hello everybody:

Hi hswang2, for liquid and solid fuels, the LHV in MJ/kg is calculated (with a ± 3% error) in this way:

LHV = 34,8*c + 93,8*h + 10,46*s + 6,28*n - 10,8*o - 2,5*w

where:

c = Carbon content in kg.
h = Hydrogen content in kg.
s = Sulphur content in kg.
n = Nitrogen content in kg.
o = Oxygen content in kg.
w = Water content in kg.

I hope this helps you.

[ELEMAN]

Hello everybody:

You can take a look to this thread http://www.eng-tips....d=143839&page=1

[Bharat Abhyankar]

HHV = LHV + latent heat of vaporization of water formed during combustion

In all practical calculations of Heat Duty LHV is used as it gives energy available for heat transfer.
Heat duty corresponding to HHV is not possible to achieve in practice.

[kybele39]

hswang2,

I posted a spreadsheet on industry professionals forum, a basic spreadsheet that can calculate LHV and HHV's based on composition of fuel mix.

Look for the forum called "two spreadsheet calculations" by ankur2601

Good luck