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Merge pull request #9128 from mwerezak/canister_valve

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Fixes pressure overshoot when filling nearly empty tanks
This commit is contained in:
Chinsky
2015-05-12 16:29:32 +03:00
parent 57b5d43b4e bab998d011
commit c36ac12d9f
1 changed files with 12 additions and 3 deletions
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15
code/ATMOSPHERICS/_atmospherics_helpers.dm
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@@ -427,10 +427,19 @@
//If set, sink_volume_mod adjusts the effective output volume used in the calculation. This is useful when the output gas_mixture is
//part of a pipenetwork, and so it's volume isn't representative of the actual volume since the gas will be shared across the pipenetwork when it processes.
/proc/calculate_transfer_moles(datum/gas_mixture/source, datum/gas_mixture/sink, var/pressure_delta, var/sink_volume_mod=0)
//Make the approximation that the sink temperature is unchanged after transferring gas
var/air_temperature = (sink.temperature > 0)? sink.temperature : source.temperature
var/output_volume = (sink.volume * sink.group_multiplier) + sink_volume_mod
if(source.temperature == 0 || source.total_moles == 0) return 0
var/output_volume = (sink.volume * sink.group_multiplier) + sink_volume_mod
var/source_total_moles = source.total_moles * source.group_multiplier
var/air_temperature = source.temperature
if(sink.total_moles > 0 && sink.temperature > 0)
//estimate the final temperature of the sink after transfer
var/estimate_moles = pressure_delta*output_volume/(sink.temperature * R_IDEAL_GAS_EQUATION)
var/sink_heat_capacity = sink.heat_capacity()
var/transfer_heat_capacity = source.heat_capacity()*estimate_moles/source_total_moles
air_temperature = (sink.temperature*sink_heat_capacity + source.temperature*transfer_heat_capacity) / (sink_heat_capacity + transfer_heat_capacity)
//get the number of moles that would have to be transfered to bring sink to the target pressure
return pressure_delta*output_volume/(air_temperature * R_IDEAL_GAS_EQUATION)