Drying wood in the dryer, to produce dry wood and resin wasn’t quite as streamlined in the alpha as it is today; 900 bark and 600 wood (full dryer) would result in some wood (40 IIRC) being left over, so not quite enough to switch the stacks around. Now, however, the math is very simple.
1 bark gives a burn time of 20 seconds in the dryer.
1 wood takes 40 seconds (2 bark) to be dried.
Drying 1 wood will result in 2 dry wood and 1 resin.
15 slots in the dryer.
5 slots of wood (500) will require 10 slots of bark (1000) to be dried.
20000 seconds, or 5 hours, 33 minutes and 20 seconds to run a full batch.
This will result in 1000 dry wood and 500 resin.
1 bark per 1 dry wood.
2 bark per 1 resin.
1 dry wood and 1 resin are required to make 1 insulated wood.
2 bark is required per 1 insulated wood and 1 leftover dry wood.
Dry wood has a burn time of 48 seconds in the furnace (72 seconds with a T3+ smelter), same as oil, both being equally good as fuel, and sharing the #1 spot as the best fuel in the game.
1 dry wood produced every 20 seconds, consuming 1 bark.
3 dry wood produced every 1 minute, consuming 3 bark.
180 dry wood produced every 1 hour, consuming 180 bark.
1 resin produced every 40 seconds, consuming 2 bark.
1.5 resin produced every 1 minute, consuming 3 bark.
90 resin produced every 1 hour, consuming 180 bark.
1000 dry wood (full dryer’s worth) gives you 48000 seconds (800 minutes, or 13 hours and 20 minutes) of furnace burn time, 72000 seconds (1200 minutes, or 20 hours) with a T3+ smelter.
1000 bark (full dryer load) gives you 20000 seconds (5 hours, 33 minutes and 20 seconds) of furnace burn time, 30000 seconds (500 minutes, or 8 hours and 20 minutes) with a T3+ smelter.
500 wood (full dryer load) gives you 5000 seconds (1 hour, 23 minutes and 20 seconds) of furnace burn time, 7500 seconds (2 hours and 5 minutes) with a T3+ smelter.
In total, the materials required to produce 1000 dry wood (48000 seconds of furnace burn time) would only give you 25000 seconds of furnace burn time, so you nearly double your fuel efficiency by taking it through a dryer, also gaining resin in the process. Not that anyone would use bark as a furnace fuel anyway.
There’s some numbers concerning dry wood and drying wood. It’s a bit of a dry subject but just in case someone hadn’t bothered to look into it, there you go.
TL;DR: Put 5 stacks of wood (5x100=500) and 10 stacks of bark (10x100=1000) into a dryer and press play.