Useful Conversions and Data Charts

Energy Content of Common Fuels

1 gallon of gasoline energy equivalent

= 380 SCF H2 (10 Nm3)
= 113 SCF Natural Gas
= 8.3 Lb of Coal

Transportation range Afforded by 100 SCF of Hydrogen

When burned in an automobile engine

6 - 12 miles

When consumed in a fuel cell

12 - 24 miles



Features of Hydrogen Combustion

(HHV)

(LHV)

MASS OF HYDROGEN

Energy Content and Mass of 100 Standard Cubic Feet of Hydrogen

31,740 BTU

26,840 BTU

0.521 LBS

9.30 KwH

7.87 KwH

0.236 KG

33,486 kJ

28,317 kJ

.

8,004 kCal

6,768 kCal

.



Factors for Unit Conversions
 

Quantity

Equivalent Values

Pressure

1 atm

= 1.01325 x 105 N/m2 (Pa) = 1.01325 bars
= 1.01325 x 106 dynes/cm2
= 760 mm Hg @ 0oC (torr) = 10.333 m H2O @ 4oC
= 14.696 lbf/in.2 (psi) = 33.9 ft H2O @ 4oC

Volume

1 m3

= 1000 liters = 106 cm3 = 106 ml
= 35.3145 ft3 = 220.83 imperial gallon = 264.17 gallons
= 1056.68 quarts

1 ft3

= 1728 in.3 = 7.4805 gallons = 0.028317 m3 = 28.317 liters
= 28,317 cm3
 

1 Nm3

= 38 SCF (Nm is at 0 deg C, SCF is at 70 deg F)

Power

1 W

= 1 J/s = 0.23901 cal/s = 0.7376 ft.lbf/s = 9.486 x 10-4 Btu/s
= 1.341 x 10-3 hp

Energy

1 J

= 1 N.m = 107 ergs = 107 dyne.cm
= 2.778 x 10-7 kWh = 0.23901 cal= 0.7376 ft-lbsf
= 9.486 x 10-4 Btu 



Gas Flow Conversion Chart

Nm3/h

Liters/min

Cc(ml)/min

Scf/h

Scf/month

0.005

0.08

80

0.19

139

0.01875

0.3

300

0.7125

520

0.0375

0.6

600

1.425

1,040

0.075

1.2

1,200

2.85

2,081

0.125

2

2,000

4.75

3,468

0.5

8

8,000

19

13,870

1

16

16,000

38

27,740

2

32

32,000

76

55,480

5

80

80,000

190

138,700

10

160

160,000

380

277,400

15

240

240,000

570

416,100

25

400

400,000

950

693,500

Standard cubic foot is measured at 70 degrees F and one atmosphere
Normal meter is measured at 0 degrees C and one bar

Tank Storage Information Using the above formula, a 100 gallon tank will hold 133.7 standard cubic feet at 10 bar pressure (147 psi)