Gross and Net Heating Values

1
Gross and Net Heating Values

• In this presentation we will we show how to
  calculate Heating Values of Fuels.

2
Select Option
1. Click on Stoichiometry,
which is the ratio of air to fuel.
3
Select the Fuel

• Select Natural gas from Pittsburgh

4
Edit Fuel Composition

• Fuel composition is
• 86.5 Methane
• 5.0 Ethane
• 5 Carbon dioxide
• 1 Propane
• 1 Butane
• 1 Nitrogen
• 0.5 Isobutane
• Click on the numerical values to edit

5
Enter Temperature and Pressure

• Fuel data are
• Temperature 60F
• Barom.Pressure 30 inch Hg
• 100 Saturated
• NB Barom.pressure must be set from AIR CTRL
• Alternatively set Barom.pressure to 29.92 and
  gauge pressure to (30.00-29.92)13.61 1.09 inWC
  (water column)

6
Print out the report
7
Thats it !
but, what if I have a component that is not
listed ?
8
To add a component

• OK! Let us assume that the Pittsburgh gas
  contain 0.5 vol Hydrogen sulfide and 0.6 vol
  Nitrogen all others being the same.
• We will need the heat of formation for H2S(gas)
• From Perrys Handbook we have Hf -4.77
  kcal/mole e.g. - 4,1844.77 -19.95 kJ/gmole

9
Adding Hydrogen Sulfide

• Click on the Oxygen text
• Type in Hydrogen Sulfide
• Enter 2 Hatoms
• Enter 1 Satoms
• Enter 0.5 vol
• Enter 19.95 as Heat of Formation
• The program will fill in the rest.

10
Add component
11
Save new composition

• Click on Save composition to file
• Select Yes
• Enter the new name for the fuel

12
Show Me

• Click here to download a demo file