Guide/Temperature Management

From Oxygen Not Included Wiki
Jump to: navigation, search

This article is a stub. You can help Oxygen Not Included Wiki by expanding it.

Temperature management is one of the key challenges of the game. Your Duplicants, your plants and your items will suffer and break if their temperature is too high or too low. The environment can get warmer through items that produce heat, creeps through walls and resources, even your Duplicants produce and spread some heat by mere existence. Similarly Chilliness can spread by air exchange or heat spreading towards colder regions. Controlling the environment is one of the key challenges in this game.

Is too cold[edit | edit source]

This problem is the easiest to handle. Many game items, your Duplicants and certain special features of your colony environment produce heat.

Heat sources[edit | edit source]

  • Space Heater produces 90W of heat at the cost of 120W of power, but it is generally not worth using, as its only other effect is meager 10 decor
  • Charged Battery and Tiny Battery produce 6.3W of heat when charged (they do not actually lose any charge at the moment). They're small, short, clean and useful in other ways and so a good way to provide extra heat.
  • Ceiling Lamp produces just 2.5W of heat at 10W of power, but it fits right above Sculpting Block
  • Electrolyzer produces 6.3W of heat, but its output gases seem to be hotter than that (always 60°C?) . Needs more testing. Has a disadvantage of producing Hydrogen, which quickly cools down (if it is cold) Duplicants due to its high thermal conductivity
  • Algae Deoxydizer produces 7.5W of heat
  • Coal Generator produces 45W of heat, but utilizing it can be tricky, due to large amount of Carbon Dioxide in exhaust.
  • Steam Geyser outputs steam hot enough to damage Gold Amalgam pumps. It can be cooled down into 90 degree Water, which then can be piped around the colony, for example to Shower (Duplicants won't mind near-boiling shower). Heat will then radiate from the pipes.
  • A nearby Biome can provide a surprising amount of heat (or cold). Biomes do not keep their own temperature after map generation, so this is a temporary source.

It is too warm[edit | edit source]

This is the tricky bit. There are two straightforward ways to destroy heat:

  • Hydrofan occupies a duplicant and uses up water
  • Wheezewort works rather slowly in most gases and natural setups and can't be mass-produced, but doesn't use any power

Avoiding heat[edit | edit source]

In early game, it's better to move the heat to where it won't cause trouble than to try to truly destroy it.

  • Dump excess heat in cold biome. Acquire cold gases and cold water from cold biomes.
  • Plant irrigation is one of the worst places to misplace extra heat - do not use hot water to irrigate cold-loving plants (Bristle Blossom). If you have no choice, use valves to avoid storing excess hot water in farms (water being consumed doesn't heat the plant up, standing water does), use Abyssalite pipes in the sections that need to stay cool, and pre-cool the water by winding pipes carrying it through cool areas
  • Use Abyssalite pipes for hot fluids in colony, but Granite ones outside it

Late game solutions[edit | edit source]

A more complex way is to heat up a heat sink (solid, liquid or gas) and then destroy the sink. Thermo Regulator cools a gas piped through it, by absorbing some of its heat, then passing the heat to the gas surrounding it

The following objects can destroy hot fluids:

  • The Void is a rare "reverse geyser", which destroys nearby gases
  • Electrolyzer produces outputs with set temperature. Both nearly-boiling and nearly-freezing water will be turned into 60°C gases
  • Water Purifier uses non-renewable Sand, but can get rid of hot polluted water, for example from showers fed geyser water, and produces manageable 40°C water
  • Hydrogen Generator and Natural Gas Generator both get heated up by excess gas stored inside them, but do not seem to otherwise absorb the heat

The temperature is right[edit | edit source]

now how to keep it like that?

Heat[edit | edit source]

Measured in Celsius (or Kelvin, depending on your game settings) it defines the amount of thermal energy stored in an object. Heat is roughly amount of thermal energy times the heat capacity of any object.

Specific Heat Capacity[edit | edit source]

This property basically defines how much an objects temperature changes if you add or remove an amount of energy. Its unit is Joules / (Gram * Degree Celsius).
With this property you can calculate how much energy you need to reduce from hot water to give it an ambient temperature. Or how hot the gas in a room becomes if a Battery is in it. and many other applications.

How much energy is required ...[edit | edit source]

... to cool down one Tile of Water with 80°C to 20°C? A tile full of Water contains 1,000kg of Water - or 1 million grams. The Temperature delta is 60 Degrees, and the Specific Heat Capacity of Water is:
\frac{4.179 J}{1g * 1 ^\circ C}
x = \frac{4.179 J}{1 g * 1 ^\circ C} * 1,000,000g * 60 ^\circ C
x = 4.179 J * 1,000,000 * 60
x = 250,740,000J = 250.74MJ
This is not how much energy is required to cool it down, but how much energy needs to be removed from it.

Thermal Conductivity[edit | edit source]

This property defines how easy heat can be exchanged between two objects (where walls, resources, gas, liquids, plants and items all are objects). Its unit is Watts / (Meter * Degree Celsius). In this game a Tile is considered to be a meter high and wide. For more information on how Energy and Wattage(Power) are related, read the Power guide. Here is a nice video explaining it.