Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

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Energy Storage Density

Energy density - by weight and volume - for some ways to store energy

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Energy StorageTypical Energy Densities
(kJ/kg)

Load Calculator!
(MJ/m3)
Thermal Energy, low temperature Water, temperature difference 100oC to 40oC 250 250
Stone or rocks, temperature difference 100oC to 40oC 40 - 50 100 - 150
Iron, temperature difference 100oC to 40oC 30 230
Thermal Energy, high temperature Stone or rocks, temperature difference 400oC to 200oC 160 430
Iron, temperature difference 400oC to 200oC 100 800
Conventional Fuels Energy Crude Oil 42000 37000
Coal 32000 42000
Dry Wood 12500 - 20000 10000 - 16000
Synthetic Fuels Energy Hydrogen, gas 120000 - 142000 10
Hydrogen, liquid 120000 - 142000 8700
Methanol 21000 17000
Ethanol 28000 22000
Electrochemical Energy Lead-acid batteries 40 - 140 100 - 900
Nickel-cadmium batteries 350 350
Lithium ion batteries 700 1400
Mechanical Energy Hydropower, 100 m head 1 1
Compressed air   15
Flywheel, steel 30 - 120 240 - 950
Flywheel, composite materials > 200 > 100
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Topics

Unit Converters

Temperature

oC
oF


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Length

m
km
in
ft
yards
miles
naut miles


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Area

m2
km2
in2
ft2
miles2
acres


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Volume

m3
liters
in3
ft3
us gal


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Weight

kgf
N
lbf


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Velocity

m/s
km/h
ft/min
ft/s
mph
knots


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Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O


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Flow

m3/s
m3/h
US gpm
cfm


Load Calculator!

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