Right. But I was using net efficiency values from papers on cryocoolers, not Carnot efficiency values.
That’s another issue with liquid hydrogen fuel:
combustion to gas: 119.93 kJ/g
vaporization: 446 J/g
ortho-para conversion: 670 J/g
Burning liquid hydrogen in a car engine would probably make less energy than it takes to liquify the hydrogen.
Right. But I was using net efficiency values from papers on cryocoolers, not Carnot efficiency values.
That’s another issue with liquid hydrogen fuel:
combustion to gas: 119.93 kJ/g
vaporization: 446 J/g
ortho-para conversion: 670 J/g
Burning liquid hydrogen in a car engine would probably make less energy than it takes to liquify the hydrogen.