Gross heating and net heating values

Gross heating and net heating values for some common gases can be found in the table below:

Fuel Gas	(kcal/kg)		(kcal/nm3) 1)
	Gross Heating Values	Net Heating Values	Gross Heating Values	Net Heating Values
Hydrogen	33,889	28,555	3,050	2,570
Methane	13,284	11,946	9,530	8,570
Ethane	12,400	11,350	16,700	15,300
Ethylene	12,020	11,270	15,100	14,200
Natural Gas	~12,000	~11,000	~9,000	~8,000
Propane	12,030	11,080	24,200	22,250
Propylene	11,700	10,940	22,400	20,900
n-Butane	11,830	10,930	31,900	29,400
Iso-Butane	11,810	10,900	31,700	29,200
Butylene-1	11,580	10,830	29,900	27,900
Iso-Pentane (liquid)	11,600	10,730
LPG (average)	11,920	10,997	28,000	25,775
Acetylene	11,932	11,514	13,980	13,490
Carbon Monoxide	2,411	2,411	3,014	3,014

¹⁾ nm³ = normal cubic meter

• 1 kJ/kg = 1 J/g = 0.4299 Btu/ lb_m = 0.23884 kcal/kg