Add CH4 fuel cell (#161)

GameData/KerbalismConfig/Localization/en-us.cfg

@@ -163,6 +163,10 @@ Localization
 		#KERBALISM_empty_lqd_hydrogen = $VESSEL Liquid Hydrogen tanks are empty
 		#KERBALISM_refill_lqd_hydrogen = $VESSEL has refilled the Liquid Hydrogen tanks
 
+		#KERBALISM_low_lqd_methane = $VESSEL Liquid Methane reserves are low
+		#KERBALISM_empty_lqd_methane = $VESSEL Liquid Methane tanks are empty
+		#KERBALISM_refill_lqd_methane = $VESSEL has refilled the Liquid Methane tanks
+
 		#KERBALISM_low_lqd_oxygen = $VESSEL Liquid Oxygen reserves are low
 		#KERBALISM_empty_lqd_oxygen = $VESSEL Liquid Oxygen tanks are empty
 		#KERBALISM_refill_lqd_oxygen = $VESSEL has refilled the Liquid Oxygen tanks

GameData/KerbalismConfig/Profiles/ROKerbalism.cfg

@@ -87,6 +87,13 @@ Supply
 	refill_message = #KERBALISM_refill_lqd_hydrogen //$VESSEL has refilled the Liquid Hydrogen tanks
 }
 Supply
+{
+	resource = LqdMethane
+	low_message = #KERBALISM_low_lqd_methane //$VESSEL Liquid Methane reserves are low
+	empty_message = #KERBALISM_empty_lqd_methane //$VESSEL Liquid Methane tanks are empty
+	refill_message = #KERBALISM_refill_lqd_methane //$VESSEL has refilled the Liquid Methane tanks
+}
+Supply
 {
 	resource = LqdOxygen
 	low_message = #KERBALISM_low_lqd_oxygen //$VESSEL Liquid Oxygen reserves are low
@@ -451,6 +458,33 @@ Supply
 		output = ElectricCharge@1.0
 		dump = Water
 	}
+	
+	//Methane fuel cells
+	// source: https://pubs.rsc.org/en/content/articlelanding/2017/ra/c7ra05245f
+	// https://pubs.rsc.org/en/content/articlelanding/2017/ra/c7ra05245f
+	// Still in development, not going for a specific technology
+	// Similar efficiency to H2 fuel cells
+	// Guessing 75% efficient by HHV
+	// Methane has a HHV of 55.5 MJ/kg
+	// Liquid Methane has a density of 0.42561 kg/L
+	// Therefore, we need 0.0000423346 / 0.75 = 0.0000564461 L/s of Lqd Methane to generate 1 kW
+	// 3.9899 kg O2 for every kg methane
+	// Liquid Oxygen has a density of 1.141 kg/L, so 1.4883 L oxygen for every liter methane
+	// running stoich, we then need 0.0000840087 L/s of Lqd Oxygen to match
+	// 0.0864864 kg/hr LCH4, 0.345074 kg/hr O2
+	// this will produce 0.194271 kg/hr H2O and 0.237298 kg/hr CO2
+	// 0.0000539642 L/s H2O, 0.0337858 L/s CO2
+	Process
+	{
+		name = fuel cell ch4
+		modifier = _FuelCellCH4
+		input = LqdOxygen@0.0000840087
+		input = LqdMethane@0.0000564461
+		output = Water@0.0000539642
+		output = CarbonDioxide@0.0337858
+		output = ElectricCharge@1.0
+		dump = Water,CarbonDioxide
+	}
 
 	// Based on current electrolysis rates where it takes 12.749kWh to make 1L of H
 	// Convention: 1 "unit" creates just a little more O2 per second than is needed for 1 crew
@@ -1236,6 +1270,14 @@ Supply
 		capacity = 1
 		running = true
 	}
+	MODULE
+	{
+		name = ProcessController
+		resource = _FuelCellCH4
+		title = CH4 Fuel Cell
+		capacity = 1
+		running = true
+	}
 
 	MODULE
 	{
@@ -1317,6 +1359,21 @@ Supply
 				id_value = _FuelCellShuttle
 			}
 		}
+
+		SETUP //CH4
+		{
+			name = CH4 Hydrocarbon Fuel Cell
+			desc = Combines <b>LqdMethane</b> and <b>LqdOxygen</b> to produce <b>Water</b>, <b>Carbon Dioxide</b> and <b>Electricity</b>.
+			tech = powerNF
+			mass = 0.015	//better specific power than H2 fuel cells, but requires more cooling
+
+			MODULE
+			{
+				type = ProcessController
+				id_field = resource
+				id_value = _FuelCellCH4
+			}
+		}
   	}
 }
 
@@ -1353,6 +1410,14 @@ Supply
 		capacity = 0.75
 		running = true
 	}
+	MODULE
+	{
+		name = ProcessController
+		resource = _FuelCellCH4
+		title = CH4 Fuel Cell
+		capacity = 0.75
+		running = true
+	}
 
 	MODULE
 	{
@@ -1404,6 +1469,21 @@ Supply
 				id_value = _FuelCellShuttle
 			}
 		}
+
+		SETUP //CH4
+		{
+			name = CH4 Hydrocarbon Fuel Cell
+			desc = Combines <b>LqdMethane</b> and <b>LqdOxygen</b> to produce <b>Water</b>, <b>Carbon Dioxide</b>, and <b>Electricity</b>.
+			tech = powerNF
+			mass = 0.01125
+
+			MODULE
+			{
+				type = ProcessController
+				id_field = resource
+				id_value = _FuelCellCH4
+			}
+		}
  	}
 }
 
@@ -1440,6 +1520,14 @@ Supply
 		capacity = 6
 		running = true
 	}
+	MODULE
+	{
+		name = ProcessController
+		resource = _FuelCellCH4
+		title = CH4 Fuel Cell
+		capacity = 6
+		running = true
+	}
 
 	MODULE
 	{
@@ -1491,6 +1579,21 @@ Supply
 				id_value = _FuelCellShuttle
 			}
 		}
+
+		SETUP //CH4
+		{
+		name = CH4 Hydrocarbon Fuel Cell
+		desc = Combines <b>LqdMethane</b> and <b>LqdOxygen</b> to produce <b>Water</b>, <b>Carbon Dioxide</b> and <b>Electricity</b>.
+		tech = powerNF
+		mass = 0.0825
+
+			MODULE
+			{
+				type = ProcessController
+				id_field = resource
+				id_value = _FuelCellCH4
+			}
+		}
   	}
 }
 
@@ -2159,6 +2262,7 @@ RESOURCE_DEFINITION
   density = 0.0
   isVisible = false
 }
+
 RESOURCE_DEFINITION
 {
   name = _FuelCellGas
@@ -2173,7 +2277,14 @@ RESOURCE_DEFINITION
   isVisible = false
 }
 
-@PART:HAS[@MODULE[ProcessController]:HAS[#resource[_FuelCell]]]:NEEDS[ProfileRealismOverhaul]:LAST[Kerbalism]
+RESOURCE_DEFINITION
+{
+  name = _FuelCellCH4
+  density = 0.0
+  isVisible = false
+}
+
+@PART:HAS[@MODULE[ProcessController]:HAS[#resource[_FuelCell*]]]:NEEDS[ProfileRealismOverhaul]:LAST[Kerbalism]
 {
 	@tags ^=:$:, fuel cell, lqdhydrogen, lqdoxygen, generator
 }