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# Soot concentration conversion

## Soot concentration conversion

(OP)
G'day

Can anyone please provide assistance in converting a concentration (in my case soot) from g/bhp.hr to g/m3.
So far have only be able to find contadicting formulas.

Cheers

Jeremy

### RE: Soot concentration conversion

As I see it, g/bhp.h is not a concentration per se but an emission measure of whatever (soot in this case) from a combustion process as carried out mainly in internal combustion engines.

The bhp.h is a unit of energy and is also expressed in other units such as kcal, Btu, N.m, J, electron volts, volt.coulomb, and so on.

As an example, a diesel motor would consume about 0.22 L of fuel per delivered bhp.h .

Thus 1 bhp.h would be equivalent to the energy obtained from burning 0.00022 m3 of fuel. Thus 1 g soot/bhp.h would be equivalent to ~4500 g soot/m3 of fuel. If the density of the fuel is 800 kg/m3, the result would be ~5.7 g soot/kg fuel.
This conversion depends on the calorific value of the fuel, the efficiency of the combustion process and of the machine.

Now, if you'd like to express the soot, as a concentration, in g soot/m3 of exhaust gas one has to estimate an exhaust volume of the combustion gases. In our case let's say 14 normal m3/kg fuel. The above result would become ~0.41 g soot/Nm3 of emitted gas.

Nm3 is 1 cubic meter at 0 deg C and 1 atm abs.

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