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Air alarm cooling now resembles thermodynamics

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Gas cooling power consumption now resembles the work required to operate
a Carnot heat pump. Cooling hot air takes less energy than cooling cold
air.
This commit is contained in:
mwerezak
2014-07-11 14:34:07 -04:00
parent b78c918c58
commit db29d172f5
2 changed files with 43 additions and 12 deletions
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24
code/ZAS/_gas_mixture.dm
View File

@@ -141,6 +141,30 @@ What are the archived variables for?
return max(MINIMUM_HEAT_CAPACITY,heat_capacity_archived) return max(MINIMUM_HEAT_CAPACITY,heat_capacity_archived)
//this seems like such a common thing to do I can't believe this hasn't been made into it's own proc yet.
/datum/gas_mixture/proc/add_thermal_energy(var/thermal_energy)
//Purpose: Adjusting temperature based on thermal energy transfer
//Called by: Anyone who wants to add or remove energy from the gas mix
//Inputs: An amount of energy in J to be added. Negative values remove energy.
//Outputs: The actual thermal energy change.
var/old_temperature = temperature
var/heat_capacity = heat_capacity()
temperature += thermal_energy/heat_capacity
if (temperature < 0)
temperature = 0
return (temperature - old_temperature)*heat_capacity
/datum/gas_mixture/proc/get_thermal_energy_change(var/new_temperature)
//Purpose: Determining how much thermal energy is required
//Called by: Anyone. Machines that want to adjust the temperature of a gas mix.
//Inputs: None
//Outputs: The amount of energy required to get to the new temperature in J. A negative value means that energy needs to be removed.
return heat_capacity()*(new_temperature - temperature)
/datum/gas_mixture/proc/total_moles() /datum/gas_mixture/proc/total_moles()
return total_moles return total_moles
/*var/moles = oxygen + carbon_dioxide + nitrogen + phoron /*var/moles = oxygen + carbon_dioxide + nitrogen + phoron

23
code/game/machinery/alarm.dm
View File

@@ -198,17 +198,24 @@
var/datum/gas_mixture/gas var/datum/gas_mixture/gas
gas = location.remove_air(0.25*environment.total_moles) gas = location.remove_air(0.25*environment.total_moles)
if(gas) if(gas)
var/heat_capacity = gas.heat_capacity()
var/energy_used = min( abs( heat_capacity*(gas.temperature - target_temperature) ), MAX_ENERGY_CHANGE)
//Use power. Assuming that each power unit represents 1 watts.... if (gas.temperature <= target_temperature) //gas heating
var/energy_used = min( gas.get_thermal_energy_change(target_temperature) , MAX_ENERGY_CHANGE)
gas.add_thermal_energy(energy_used)
use_power(energy_used, ENVIRON) use_power(energy_used, ENVIRON)
else //gas cooling
var/heat_transfer = min(abs(gas.get_thermal_energy_change(target_temperature)), MAX_ENERGY_CHANGE)
//We need to cool ourselves. //Assume the heat is being pumped into the hull which is fixed at 20 C
if(environment.temperature > target_temperature) //none of this is really proper thermodynamics but whatever
gas.temperature -= energy_used/heat_capacity
else //heat transfer is limited by the max amount of power the heat pump can put out, which lets say is also MAX_ENERGY_CHANGE
gas.temperature += energy_used/heat_capacity heat_transfer = min(heat_transfer, gas.temperature/T20C*MAX_ENERGY_CHANGE)
var/energy_used = heat_transfer * T20C/gas.temperature
gas.add_thermal_energy(-heat_transfer)
use_power(energy_used * 1.1, ENVIRON) //heat pump inefficiencies
environment.merge(gas) environment.merge(gas)