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The list is somewhat biased: Iron (from iron ore) [...] Steel (from iron) Paper (from standing timber) Is the energy for digging up the ore or
by stewbrew 7y ago
The list is somewhat biased:
Iron (from iron ore)
[...]
Steel (from iron)
Paper (from standing timber)
Is the energy for digging up the ore or felling that tree + transport + machinery for production included? Steel should probably also include the numbers for iron.
The list would benefit from a common baseline. Without that these are just random numbers.
- londons_explore 7y agoI'd prefer it said: Steel (from the things Steel is typically made from in 2019 - 80% iron ore, 50% process X, 20% recycled) That gets tricky, because many industrial processes use large amounts of energy, but only because that energy is effectively 'free' as waste heat from other processes.
- dredmorbius 7y agoThe list is specifying clearly what the derived energy values are for. Not that they're necessarily typical (though I suspect these are). There's a tremendous variability to industrial processes and material utilisation, including virgin vs. recycled materials. Listing from among options may help clarify engineering / manufacturing / consumption values and choices.