Saturday, 16 January 2016

What's the energy density of liquid nitrogen?


Liquid nitrogen seems to be attracting a bit of attention at the moment as a medium of energy storage, both for electricity grid applications and for transport.


For example, Highview are doing round-trip electricity storage via liquid nitrogen.


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The Dearman Engine Company are developing a "liquid-air" vehicle engine.



And the UK’s Institution of Mechanical Engineers has formed a Liquid Air working group.


What is the energy density of liquid nitrogen, per unit volume and per unit weight, assuming we’ll be bringing it up to 20 °C, 1 bar? How does this compare to the energy densities of isooctane and of Li-ion batteries?




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