Source code for ladybug.datatype.massflowrate
# coding=utf-8
"""Mass flow rate data type."""
from __future__ import division
from .base import DataTypeBase
from .mass import Mass
[docs]class MassFlowRate(DataTypeBase):
"""MassFlowRate
"""
_units = ('kg/s', 'lb/s', 'g/s', 'oz/s')
_si_units = ('kg/s', 'g/s')
_ip_units = ('lb/s', 'oz/s')
_min = 0
_abbreviation = 'dm/dt'
_time_aggregated_type = Mass
_time_aggregated_factor = 3600
def _kg_s_to_lb_s(self, value):
return value * 2.2046
def _kg_s_to_g_s(self, value):
return value * 1000.
def _kg_s_to_oz_s(self, value):
return value * 35.274
def _lb_s_to_kg_s(self, value):
return value / 2.20462
def _g_s_to_kg_s(self, value):
return value / 1000.
def _oz_s_to_kg_s(self, value):
return value / 35.274
[docs] def to_unit(self, values, unit, from_unit):
"""Return values converted to the unit given the input from_unit."""
return self._to_unit_base('kg/s', values, unit, from_unit)
[docs] def to_ip(self, values, from_unit):
"""Return values in IP and the units to which the values have been converted."""
if from_unit in self.ip_units:
return values, from_unit
elif from_unit == 'g/s':
return self.to_unit(values, 'oz/s', from_unit), 'oz/s'
else:
return self.to_unit(values, 'lb/s', from_unit), 'lb/s'
[docs] def to_si(self, values, from_unit):
"""Return values in SI and the units to which the values have been converted."""
if from_unit in self.si_units:
return values, from_unit
elif from_unit == 'oz/s':
return self.to_unit(values, 'g/s', from_unit), 'g/s'
else:
return self.to_unit(values, 'kg/s', from_unit), 'kg/s'