View source for User:RA2lover/Sandbox/State Change Mechanics

= Solids =
Are Processed in a [[Furnace]] if its internal temperature exceeds their flash point.
====Ingots====
Removes 45 J/flashpoint temperature/g of energy and is converted to a reagent on processing.
====Ores/Reagent Mixes====
Releases contents on processing.
====Ices====
TBW
====Pure Ices====
TBW
====Things====
TBW

= Gases =

====Condensation====
If gas is below minimum condensation pressure (1800 kPa for Pollutant, 800 kPa for Nitrous Oxide, 517 kPa for Carbon Dioxide, 6.3 kPa for everything else), no condensation occurs, regardless of temperature.

Otherwise, calculate condensation temperature for the current pressure. If the current temperature is above the current temperature, no condensation occurs.
<br>If it is below, calculate an energy limit for condensation (the energy required to bring the gas under condensation down to the condensation temperature for its current pressure).
<br>This limit is then further reduced by a condensation ratio, which is fixed at 10% if there's enough energy to condense at least 0.1 moles, or 50% if less, to calculate the number of moles condensed per tick.

====Condensation Example====
A 50x stack of [[Nitrice]] is dropped into an empty 790 L [[Portable Gas Tank]] and is somehow instantly processed instead of being processed at 1x/tick.
<br>The resulting gas mix is 1125 moles of nitrogen and 125 moles of nitrous oxide(as gas), both at 5°C (278.15 K).
<br>The resulting pressure is 3659.284 kPa. The condensation temperature for the given pressure is the maximum liquid temperature for [[Nitrous Oxide]], 430.6 K.
<br>Heating the 125 moles of nitrous oxide to that temperature results in an energy limit of 708.8925 kJ.
<br>This is more than the 500 kJ required to condense all of the nitrous oxide present, so the 500 kJ limit is used instead.
<br>Because the quantities are far in excess of 0.1 mol, only 10% of the limit is used, resulting in 50kJ of condensation on this tick (12.5 moles).
<br>The gas mix's energy before the tick was 7739.52375 kJ. Adding 50kJ raises its temperature to 279.946 K (although the condensation is still incomplete).

= Liquids =

====World Liquid Density====
A world liquid has the same density as 8000 L of an ideal gas at the liquid's saturation pressure at maximum temperature would have if compressed to 7990 L.

These are how many moles of liquid a 8000L world cell can hold:
  Liquid Oxygen 35636.86 mols
  Liquid Nitrogen 30422.6 mols
  Liquid Carbon Dioxide 21812.45 mols
  Liquid Volatiles 29642.56 mols
  Liquid Pollutant 13600.7 mols
  Water 8989.58 mols
  Polluted Water 9189.66 mols
  Hydrogen 82575.7 mols
  Nitrous Oxide 4474.61 mols

====Evaporation====
Calculate evaporation energy limits, quantity limits, and an evaporation ratio, which depend on the circumstances the liquid is in.
<br>If the quantity of liquids evaporated by the evaporation energy limit exceeds the evaporation quantity limit, the evaporation quantity limit is used instead.
<br>Either of the limits(energy or quantity) is then further reduced by an evaporation ratio, which is fixed at 10% if there are more than 0.1 moles of liquids, or 50% if less.

=====Subcooled / Compressed liquids=====
If the pressure of the liquid is greater than the evaporation pressure for its temperature, no evaporation occurs.

=====Evaporating liquids=====
Liquids evaporating under normal circumstances have an evaporation energy limit, proportional to how far below the evaporation pressure the liquid is.
The maximum value under normal circumstances is the energy required to cool the liquid by 10°C in a tick. This is achieved with a pressure delta equal to the liquid's minimum liquid pressure, and linearly decreases to 0°C on smaller pressure deltas.

They also have a evaporation quantity limit. Under normal evaporation, that equates to the amount of ideal gas required to increase the network/cell's pressure to the evaporation pressure.

=====Superheated liquids=====
If the temperature of the liquid is above its maximum liquid temperature, liquid evaporation is accelerated.
The evaporation quantity limit is replaced with the total amount of liquid, and the evaporation energy limit is increased to the energy required to cool the liquid down to its maximum liquid temperature if that is greater than the existing evaporation energy limit. 

=====Supercooled liquids=====
Liquids below 1 K above their freezing temperature inside a network evaporate at a slower rate, with their evaporation energy reduced to quantity*specific heat W. This limits their maximum cooling rate to 1°C/s.
Liquids below their freezing temperature have their evaporation pressure linearly reduced to the Armstrong pressure (6.3 kPa) at half their freezing point. As most liquids are at armstrong pressure at their freezing point, this only affects Liquid Carbon Dioxide, Liquid Nitrous Oxide and Liquid Pollutant.

====="Hypercooled" liquids"=====
Liquids below half their freezing temperature don't evaporate regardless of conditions. "Hypercooled" liquids can exist indefinitely in world cells not belonging to a room as long as the quantity in the cell remains below the ice formation threshold and they don't get heated back to a supercooled state.
<br>In real life, hypercooled liquids refer to supercooled liquids where the temperature has dropped to below the point where the resulting solid would be below its freezing point despite the latent heat.

====Evaporation Example====
A 7500 L room cell containing 50 kPa of water vapor and 1000 L (1123.6975 moles) of liquid water at 100°C undergoes evaporation for 1 tick.
<br>The water's evaporation pressure at this temperature is 101.325 kPa, giving us an evaporation pressure gradient of 51.325 kPa.
<br>The water's minimum liquid pressure is 6.3 kPa, which the evaporation pressure gradient is well in excess of, making the evaporation energy limit 72 J/mol*K * 10°C * 1123.6975 mol = 809.062 kJ. This energy would be enough to evaporate 101.132775 moles of water.
<br>The water's evaporation quantity limit is 6500 L of ideal gas at 51.325 kPa and 100°C, or 107.5288 mol. This limit could be increased further by removing water vapor faster to achieve a lower pressure, but because our available energy is not enough to hit the evaporation quantity limit, the available energy is completely used instead.
<br>Because the quantities are far in excess of 0.1 mol, only 10% of those 101.132775 moles of water is evaporated, resulting in 80.9062 kJ/tick of cooling.

====Evaporation Example 2====
A nitrogen gas buffer tank is used as a cold storage for later cryogenic fuel processing and is currently being cooled to -75°C (198.15 K) by a single, 200 L [[Evaporation Chamber]] loaded with Liquid [[Pollutant]]. Calculate its maximum cooling capacity at that temperature.
<br>Under perfect conditions, the evaporation chamber would maintain a perfect vacuum and 20L of liquid pollutant. We can test those assumptions by checking if it can maintain those conditions under those circumstances.
<br>The evaporation pressure for pollutant at -75°C is 2140.9 kPa, above the minimum pressure of 1200 kPa, giving an evaporation energy limit of 24.8 J/mol*K * 10°C * 500 mols = 124 kJ. This energy would be enough to evaporate 62 moles of pollutant.
<br>The evaporation quantity limit is 180L of ideal gas at 2140.9 kPa and -75°C, or 233.9 mols, above the 62 mol figure, which is used instead.
<br>Only 10% of the 62 moles are evaporated in a tick, meaning 6.2 moles are evaporated for 12.4 kJ of cooling.
<br>The evaporation chamber's built-in purge valve can remove gases at 1500 kPa*10L, or 9.10464 moles/tick at -75°C.
<br>The evaporation chamber's built-in liquid regulator can replenish liquids at 0.25 L/tick, or 6.25 mols/tick, giving very little room for scaling further(assuming the target liquid level could be modified to optimize evaporation rate).
<br>The good news is the chamber's cooling rate remains constant down to -98°C (resulting in constant cooling until the purge valve starts to struggle at approximately 20°C if unassisted), but the design needs to be scaled up should more cooling be needed.

= Reagents =
TBW

=Global= <!-- Terraforming DLC stuff, currently unused. -->
TBW