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This article contains outdated information that is inaccurate for the current version.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This article contains outdated information that is inaccurate for the current version.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:
  • as well as additional Factor, like:
    • the real heat capacity of the hotter material
    • the buildings area
Equations [1]
Scenario Formula
Cell to Cell Solid → Solid
Solid → Liquid
Gas → Liquid
Solid → Gas
Liquid → Liquid
Entity inside of a cell
Debris 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 a factor of 100.

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 .

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 eighths of the total heat difference , where the total heat is a product of its temperature , mass , and specific heat capacity :

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
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 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

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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