Pset_MaterialFuel A set of extended material properties of fuel energy typically used within the context of building services and flow distribution systems. IfcMaterial IfcMaterial CombustionTemperature Combustion temperature of the material when air is at 298 K and 100 kPa. Combustion Temperature CarbonContent The carbon content in the fuel. This is measured in weight of carbon per unit weight of fuel and is therefore unitless. Carbon Content LowerHeatingValue Lower Heating Value is defined as the amount of energy released (MJ/kg) when a fuel is burned completely, and H2O is in vapor form in the combustion products. Lower Heating Value HigherHeatingValue Higher Heating Value is defined as the amount of energy released (MJ/kg) when a fuel is burned completely, and H2O is in liquid form in the combustion products. Higher Heating Value