Net and Gross Calorific Values

[gmannix2011]

Having obtained gross calorific values for a range of materials, I need to convert these to net calorific values for inputting these into design formulas... However, the testing machine only outputs gross calorific values... Is there any way of converting gross to net?

Any help would be appreciated.

 

[JStephen]

Had to google those terms- there's also a "Heat Transfer & Thermodynamics engineering" forum here which would probably be better suited for the question. But I'm thinking if you know the water content of the combustion products, you can just adjust for the enthalpy of the vapor minus the enthalpy of liquid water. If all you have is a raw number with no information on the sample make-up, I don't see how you'd adjust it exactly.

 

[BAretired]

http://en.wikipedia.org/wiki/Heat_of_combustion#Higher_heating_value

BA