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This article contains outdated information that is inaccurate for the current version. It was last updated for LU-356355. Unreflected changes in the discussed game mechanics are detailed here: EX1-463874
This article contains outdated information that is inaccurate for the current version. It was last updated for LU-356355. Unreflected changes in the discussed game mechanics are detailed here: EX1-463874

Thermal Conductivity is the property of a material that determines how quickly it heats or cools as it comes into contact with objects of different temperatures. Although the game states that between two objects, the lowest thermal conductivity is used, this is not true for all cases.

Equations[]

The calculation of Heat Transfer in is mainly a product of:

  • the Temperature difference in °C
  • the passing time , which, in any case is one tick is
  • the applicable thermal conductivity in
    • is the lower of the two
    • the average of the two:
    • is the geometric mean of the two:

For heat transfer with buildings, additional factors include:

  • the thermal mass of the hotter object: where is mass, is specific heat capacity (SHC), and divide by 5 if the hotter object is a building
  • the buildings area
Equations [1]
Scenario Formula
Cell to Cell Solid → Solid
Solid → Liquid
Gas → Liquid
Gas → Gas
Solid → Gas
Liquid → Liquid
Entity inside of a cell
Entity on top of a solid cell
Insulated pipe and its contents
Other pipes and their contents
Building and the cells it occupies

Any Tiles, be they normal, insulated metal, plastic, bunker, glass or carpeted tiles, as well as doors, Farm Tiles, Heavi-Watt (Conductive) Joint Plates, and Tube Crossings count as Solid Cells, not as buildings.
Insulated Tiles reduce the thermal conductivity of their building material by (2/255)² (or 16 256) instead of 100 as stated in the game. It also uses instead of for the purpose of cell to cell conductivity, which is mostly going to be the insulated tile conductivity. Solid to gas multiplicator still apply.

Note: in real life, the units would cancel out, but surface area plays no role in ONI's calculation, therefore an additional meter needs to be multiplied to the product to have the equation result in DTU. (Not just meter, but a large string of units when calculating buildings.)

Another way to interpret this is that the units of Thermal Conductivity are given in-game as while the unit is actually interpreted as .

Recap of Cell to Cell multipliers
Gas Liquid Solid
Gas 1 1 25
Liquid 1 625 1
Solid 25 1 1

Because of the Gas to Solid x25 multiplier, it's recommended to add a double tiles layer or a thin liquid layer when trying to insulate two rooms, to instead get a x1 multiplier.

Limits of Heat Transfer[]

Lower Limits[]

Heat Transfer will not occur if:

  • the temperature difference is less than 1 °C
  • the calculated thermal flow is less than 0.1 DTU
  • either of the masses is less than 1g

Upper limits[]

Heat Transfer has two caps:

  • If the calculated heat transfer would result in a temperature jump of more than a fourth of their temperature difference in either material.

    Simply said: if the temperature difference is 40 °C, a materials temperature can change at most 10 °C per tick

  • If the calculated heat transfer is larger than an eighth of the total heat difference , where the total heat is a product of its temperature , mass , and specific heat capacity : . This upper limit has been removed since 509629 (Fast Friends Update).

Thermal descriptors[]

There are 4 thermal descriptors in the game, and they get attached to elements when their thermal characteristic reach a certain threshold. These descriptor does not affect the element any further.

  • Thermally Reactive: Elements have a specific Heat Capacity of less than or equal to 0.2
  • Slow heating: Elements have a specific Heat Capacity of greater than or equal to 1.0
  • Insulator: Elements have a thermal conductivity of less than or equal to 1.0
  • High Thermal Conductivity: Elements have a thermal conductivity of greater than or equal to 10.0

Pipes list[]

Liquid Pipes
Pipe Material Thermal Conductivity
Insulated Liquid Pipe Insulated Liquid Pipe Insulation Insulation 0.0000003125
Liquid Pipe Liquid Pipe Insulation Insulation 0.00001
Insulated Liquid Pipe Insulated Liquid Pipe Ceramic Ceramic 0.019375
Insulated Liquid Pipe Insulated Liquid Pipe Obsidian Obsidian 0.0625
Insulated Liquid Pipe Insulated Liquid Pipe Igneous Rock Igneous Rock 0.0625
Insulated Liquid Pipe Insulated Liquid Pipe Sedimentary Rock Sedimentary Rock 0.0625
Insulated Liquid Pipe Insulated Liquid Pipe Sandstone Sandstone 0.090625
Insulated Liquid Pipe Insulated Liquid Pipe Granite Granite 0.1059375
Insulated Liquid Pipe Insulated Liquid Pipe Wolframite Wolframite 0.46875
Insulated Liquid Pipe Insulated Liquid Pipe Tungsten Tungsten 0.46875
Liquid Pipe Liquid Pipe Ceramic Ceramic 0.62
Liquid Pipe Liquid Pipe Obsidian Obsidian 2
Liquid Pipe Liquid Pipe Igneous Rock Igneous Rock 2
Liquid Pipe Liquid Pipe Sedimentary Rock Sedimentary Rock 2
Liquid Pipe Liquid Pipe Sandstone Sandstone 2.9
Liquid Pipe Liquid Pipe Granite Granite 3.39
Insulated Liquid Pipe Insulated Liquid Pipe Thermium Thermium 6.875
Liquid Pipe Liquid Pipe Wolframite Wolframite 15
Liquid Pipe Liquid Pipe Tungsten Tungsten 60
Radiant Liquid Pipe Radiant Liquid Pipe Lead Lead 70
Radiant Liquid Pipe Radiant Liquid Pipe Niobium Niobium 108
Radiant Liquid Pipe Radiant Liquid Pipe Steel Steel 108
Radiant Liquid Pipe Radiant Liquid Pipe Iron Iron 110
Radiant Liquid Pipe Radiant Liquid Pipe Copper Copper 120
Radiant Liquid Pipe Radiant Liquid Pipe Tungsten Tungsten 120
Radiant Liquid Pipe Radiant Liquid Pipe Gold Gold 120
Radiant Liquid Pipe Radiant Liquid Pipe Cobalt Cobalt This content is available in Spaced Out (DLC) 200
Liquid Pipe Liquid Pipe Thermium Thermium 220
Radiant Liquid Pipe Radiant Liquid Pipe Aluminum Aluminum 410
Radiant Liquid Pipe Radiant Liquid Pipe Thermium Thermium 440
Gas Pipes
Pipe Material Thermal Conductivity
Insulated Gas Pipe Insulated Gas Pipe Insulation Insulation 0.0000003125
Gas Pipe Gas Pipe Insulation Insulation 0.00001
Insulated Gas Pipe Insulated Gas Pipe Ceramic Ceramic 0.019375
Insulated Gas Pipe Insulated Gas Pipe Mafic Rock Mafic Rock 0.03125
Insulated Gas Pipe Insulated Gas Pipe Obsidian Obsidian 0.0625
Insulated Gas Pipe Insulated Gas Pipe Igneous Rock Igneous Rock 0.0625
Insulated Gas Pipe Insulated Gas Pipe Sedimentary Rock Sedimentary Rock 0.0625
Insulated Gas Pipe Insulated Gas Pipe Sandstone Sandstone 0.090625
Insulated Gas Pipe Insulated Gas Pipe Granite Granite 0.1059375
Gas Pipe Gas Pipe Ceramic Ceramic 0.62
Gas Pipe Gas Pipe Mafic Rock Mafic Rock 1
Gas Pipe Gas Pipe Obsidian Obsidian 2
Gas Pipe Gas Pipe Igneous Rock Igneous Rock 2
Gas Pipe Gas Pipe Sedimentary Rock Sedimentary Rock 2
Gas Pipe Gas Pipe Sandstone Sandstone 2.9
Gas Pipe Gas Pipe Granite Granite 3.39
Radiant Gas Pipe Radiant Gas Pipe Gold Amalgam Gold Amalgam 4
Radiant Gas Pipe Radiant Gas Pipe Iron Ore Iron Ore 8
Radiant Gas Pipe Radiant Gas Pipe Cobalt Ore Cobalt Ore This content is available in Spaced Out (DLC) 8
Radiant Gas Pipe Radiant Gas Pipe Copper Ore Copper Ore 9
Radiant Gas Pipe Radiant Gas Pipe Pyrite Pyrite 9
Radiant Gas Pipe Radiant Gas Pipe Wolframite Wolframite 30
Radiant Gas Pipe Radiant Gas Pipe Aluminum Ore Aluminum Ore 41
Radiant Gas Pipe Radiant Gas Pipe Niobium Niobium 108
Radiant Gas Pipe Radiant Gas Pipe Steel Steel 108
Radiant Gas Pipe Radiant Gas Pipe Thermium Thermium 440

Solid Tiles list[]

Tile Material Thermal Conductivity
Tiles
Insulated Tile Insulated Tile Insulation Insulation 0.0000001
Tile Tile
Carpeted Tile Carpeted Tile
Insulation Insulation 0.00001
Insulated Tile Insulated Tile Ceramic Ceramic 0.00620
Insulated Tile Insulated Tile Mafic Rock Mafic Rock 0.01000
Insulated Tile Insulated Tile Fossil Fossil 0.020
Insulated Tile Insulated Tile Igneous Rock Igneous Rock 0.020
Insulated Tile Insulated Tile Obsidian Obsidian 0.020
Insulated Tile Insulated Tile Sedimentary Rock Sedimentary Rock 0.020
Insulated Tile Insulated Tile Sandstone Sandstone 0.029
Insulated Tile Insulated Tile Granite Granite 0.0339
Plastic Tile Plastic Tile Plastic Plastic 0.150
Plastic Tile Plastic Tile Solid Visco-Gel Solid Visco-Gel 0.450
Tile Tile
Carpeted Tile Carpeted Tile
Ceramic Ceramic 0.620
Window Tile Window Tile Glass Glass 1.110
Tile Tile
Carpeted Tile Carpeted Tile
Mafic Rock Mafic Rock 1.000
Tile Tile
Carpeted Tile Carpeted Tile
Fossil Fossil 2.000
Tile Tile
Carpeted Tile Carpeted Tile
Igneous Rock Igneous Rock 2.000
Tile Tile
Carpeted Tile Carpeted Tile
Obsidian Obsidian 2.000
Tile Tile
Carpeted Tile Carpeted Tile
Sedimentary Rock Sedimentary Rock 2.000
Tile Tile
Carpeted Tile Carpeted Tile
Sandstone Sandstone 2.900
Tile Tile
Carpeted Tile Carpeted Tile
Granite Granite 3.390
Metal Tile Metal Tile Depleted Uranium Depleted Uranium This content is available in Spaced Out (DLC) 20.000
Metal Tile Metal Tile Lead Lead 35.000
Metal Tile Metal Tile
Bunker Tile Bunker Tile
Steel Steel 54.000
Metal Tile Metal Tile Niobium Niobium 54.000
Metal Tile Metal Tile Iron Iron 55.000
Metal Tile Metal Tile Copper Copper 60.000
Metal Tile Metal Tile Gold Gold 60.000
Metal Tile Metal Tile Tungsten Tungsten 60.000
Window Tile Window Tile Diamond Diamond 80.000
Metal Tile Metal Tile Cobalt Cobalt This content is available in Spaced Out (DLC) 100.000
Metal Tile Metal Tile Aluminum Aluminum 205.000
Metal Tile Metal Tile Thermium Thermium 220.000

Tips[]

  • When cooling or heating an area it's better to run pipes through tiles than through atmosphere. in both cases the equation for "Building and the cells it occupies" is used which multiplies both Thermal conductivities, and in general, gasses have a much lower thermal conductivity than liquids, which have lower conductivity than solids.
    • However, if drastic cooling is desired, then Steam Turbines and Aquatuners will have to be involved, which means a cavity filled with Steam will have to be used.
  • To jury rig insulate without building new Insulated tiles, it's therefore better to run pipes through atmosphere and have the pipes therefore changing less heat with the environment.
  • Since Insulated Tiles have a factor of 1/100, and pipes a factor of 1/32, less heat is transferred if a regular pipe goes through an insulated Tile than when an insulated pipe goes through a regular Tile. Though, of course, Insulating both has an even better insulating effect.

References[]

https://forums.kleientertainment.com/forums/topic/84275-decrypting-heat-transfer/

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