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Compression Furnace

From A Tale in the Desert
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CompressionFurnace.png
Size 15x11
Where Compound




Source

This building becomes available after you have learned the Metallurgy tech.

Cost

Use

Uses Charcoal for fuel.

Operation

  • Holds up to 500 ore
  • Holds up to 20 Charcoal
  • Burns 1cc per minute for a maximum of 20 minutes

Current "fire and forget" recipes are (They take 20 minutes):

  • 117 ore, 20cc yields 4 metal,
  • 250 ore, 20cc yields 8 metal, and
  • 484 ore, 20cc yields 15 metal.

Metal Yields

The base formula is MetalYield = Round(OreAmount*3/100) - that is for every 33.3 ore you put into the furnace you get 1 metal out. However due to the way the game rounds off this formula it is possible to get a significantly better yield by hitting the right "breakpoints".

For example, a good recipe to use is 484 ore and 20 charcoal. That batch will smelt for 20 minutes and produce 15 metal. The table below shows the recipes that give the most beneficial round-off gains.

Ore Used CC Used Metal Yield Ore Cost/Metal CC/Metal CC/Ore Metal Yield/Hour Metal Yield/1000 Ore CC Cost/1000 ore Net Gain
17 20 1 17,0 20 1,176 3,0 58,8 1176,5 96,1%
50 20 2 25,0 10 0,400 6,0 40,0 400,0 33,3%
84 20 3 28,0 6.66 0,238 9,0 35,7 238,1 19,0%
117 20 4 29,3 5 0,171 12,0 34,2 170,9 14,0%
150 20 5 30,0 4 0,133 15,0 33,3 133,3 11,1%
184 20 6 30,7 3.333 0,109 18,0 32,6 108,7 8,7%
217 20 7 31,0 2.86 0,092 21,0 32,3 92,2 7,5%
250 20 8 31,3 2.5 0,080 24,0 32,0 80,0 6,7%
284 20 9 31,6 2.22 0,070 27,0 31,7 70,4 5,6%
317 20 10 31,7 2 0,063 30,0 31,5 63,1 5,2%
350 20 11 31,8 1.82 0,057 33,0 31,4 57,1 4,8%
384 20 12 32,0 1.67 0,052 36,0 31,3 52,1 4,2%
417 20 13 32,1 1.54 0,048 39,0 31,2 48,0 3,9%
450 20 14 32,1 1.43 0,044 42,0 31,1 44,4 3,7%
484 20 15 32,3 1.33 0,041 45,0 31,0 41,3 3,3%
500 19 15 33,3 1.27 0,038 47,4 30,0 38,0 0,0%

(The line in bold is the recommended recipe for common use)

Description of the columns of the table:

Column Description
Ore Used How much ore you put into the furnace
CC Used How much charcoal you put into the furnace
Metal Yield How much metal you get out of the run
Ore Use/Metal How much ore it cost to make 1 metal
CC Cost/Metal How much charcoal it cost to make 1 metal
Metal Yield/Hour How much metal you produce in an hour
Metal Yield/1000 Ore How much metal you get out of 1000 ore
CC Cost/1000 Ore How much charcoal it costs to smelt 1000 ore
Net Gain: How much metal you've gained compared to the baseline formula (MetalYield = OreAmount*3/100)

It is recommended to simply use the 484 ore + 20 cc => 15 metal recipe unless you really want to squeeze some extra mileage out of your ore at a significant increase in charcoal costs. If you want to save significantly on your ore you will have to go to the extreme recipes such as 50 ore + 20 cc => 2 metal or even 17 ore + 20 cc => 1 metal. However by using the 17 ore recipe it's possible to almost double the metal yield of the base formula by paying more than 25 times the charcoal cost.

  • Many people use the 250 Ore + 20 cc = 8 Metal as a compromise between ore, charcoal and time efficiency.


Other yield data

Ore CC metal ore/metal cc/metal
500 20 15 33.3 1.33
500 19 15 33.3 1.27
490 20 15 32.67 1.33
484 20 15 32.27 1.33
484 19 14 34.57 1.36
483 20 14 34.5 1.43
480 20 14 34.29 1.43
450 20 14 32.14 1.43
400 20 12 33.33 1.67
317 20 10 31.7 2
300 20 9 33.33 2.22
250 20 8 31.25 2.5
200 5 2 100 2.5
184 20 6 30.67 3.33
125 20 4 31.25 5.0
121 20 4 30.25 5.0
117 20 4 29.25 5.0
50 5 1 50 5.0

(For ore/metal and cc/metal ratios, lower is better)

125/20 take 2 less ore per metal than 500/19, but takes 4x CC and time.

Sprocket did some tests and noticed the base is 50, but can be rounded so
17/50/84/117/150/184 should all give the best results


Stoking the fire does not change the results, i.e. adding 10 cc now and 10 cc in 9 minutes is the same as adding 20 before firing.

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