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Ruminant Farm Simulation (RuFaS) documentation

RUFAS.routines.manure.constants_and_units.manure_constants module#

class RUFAS.routines.manure.constants_and_units.manure_constants.ManureConstants#

Bases: object

A class to store constants for manure management.

MANURE_DENSITY = 990.0#: The density of manure (kg/\(m^3\)).

UREA_MOLAR_MASS = 60.06#: The molar mass of urea (g/mol).

UREA_DENSITY = 1.32#: The density of urea (g/\(cm^3\)).

TAN_MOLAR_MASS = 17.0306#: The molar mass of TAN (g/mol).

MANURE_SOLIDS_BEDDING_DENSITY = 400.0#: The density of manure solids bedding (kg/\(m^3\)).

LIQUID_MANURE_DENSITY = 1000#: The density of liquid manure (kg/\(m^3\)).

SLURRY_MANURE_DENSITY = 990#: The density of slurry manure (kg/\(m^3\)).

SOLID_MANURE_DENSITY = 700#: The density of solid manure (kg/\(m^3\)).

DEFAULT_CARBON_FRACTION_AVAILABLE_IN_MANURE = 0.5#: Default proportion of carbon available in manure, (unitless, [0, 1]). Default is set to 0.5.

DEFAULT_CARBON_FRACTION_AVAILABLE_IN_BEDDING = 0.35#: Default proportion of carbon available in bedding, (unitless, [0, 1]). Default is set to 0.35.

EFFECTIVE_MICROBIAL_DECOMP_RATE = 0.00237#: The effectiveness of microbial decomposition rate (unitless).

DEFAULT_MOISTURE_EFFECT_MICROBIAL_DECOMP = 0.65#: The effect of moisture on microbial decomposition.

DEFAULT_DAYS_SINCE_LAST_TILLAGE = 1#: Default number of days since last tillage used in the calculation of the carbon decomposition rate (days). Default is set to 1.

DEFAULT_LAG_TIME = 2#: Default lag time used in the calculation of the carbon decomposition rate (days). Default is set to 2.

COMPOST_BEDDING_ORGANIC_NITROGEN_FRACTION = 0.952#: The fraction of organic nitrogen in compost bedding (unitless, [0, 1]). Default is set to 0.952.

COMPOST_BEDDING_INORGANIC_NITROGEN_AMMONIUM_FRACTION = 0.5#: The fraction of inorganic nitrogen in compost bedding that is ammonium (unitless, [0, 1]). Default is set to 0.5.

COMPOSTING_N2O_INDIRECT_EMISSION_FACTOR = 0.01#: The constant factor for indirect N2O emissions lost due to leaching and NH3.

METHANE_TO_VOLATILE_SOLIDS_FACTOR = 3#: The conversion from methane emission to volatile solids (NEED UNITS!). Set to 3.

LIQUID_MANURE_SOLIDS_FRACTION = 0.05#: The fraction of total solids in Liquid manure. Temporary placeholder until upstream solids tracking is fixed.

METHANE_DESTRUCTION_EFFICIENCY = 81#: The percentage of methane destroyed in systems using a cap and flare

AD_TAN_INCREASE_FACTOR = 1.6#: The factor by which manure total ammoniacal nitrogen content is increased by the anaerobic digestion process (unitless).