So, all the machines and factories have the same power consumption except for Purification Chamber. It's 200W per processing slot. Speed upgrades don't affect power consumption, so, speed upgrades also make devices more efficient.
Smelting 10 items without speed upgrades:
20 KJ at 200W (that means that it takes 10 seconds to smelt one item)
Smelting 10 items with 8 speed upgrades:
2.2KJ at 200W (1.1 second per item)
Purification Chamber consumes 600 W, but by the other parameters is the same (10 seconds/item without upgrades, 1.1 with upgrades), Energy per item is also three times more than other machines.
To get 3x ore you need
1) Put ore into Purification Chamber (also requires Flint). Get 3x <ore> clump
2) Put the clumps into Crusher. Get dirty <ore> dust
3) Put that dust into Enrichment Chamber. Get <ore> dust
4) Smelt that in Energized Smelter or any other Furnace.
For 2-4 you can use Factories. They just the same machines but with multiple input and output slots. They have three tiers each and can process 3, 5, or 7 items simultaneously according to a tier.