def test_grashof():
ambient_temperature = 40
conductor_temperature = 100
elevation = 0
tf = cigre601.temperature_film(conductor_temperature, ambient_temperature)
gr = cigre601.grashof(
conductor.drake_constants,
conductor_temperature,
ambient_temperature,
tf,
elevation,
)
assert gr == pytest.approx(96.95e3, abs=0.01e3)
ambient_temperature = 20
elevation = 500
tf = cigre601.temperature_film(conductor_temperature, ambient_temperature)
gr = cigre601.grashof(
conductor.drake_constants_example_b,
conductor_temperature,
ambient_temperature,
tf,
elevation,
)
assert gr == pytest.approx(131e3, abs=0.1e3)
def test_dynamic_viscosity():
ambient_temperature = 40
conductor_temperature = 100
tf = cigre601.temperature_film(conductor_temperature, ambient_temperature)
v = cigre601.dynamic_viscosity(tf)
assert v == pytest.approx(20.384e-6, abs=0.001e-6)
ambient_temperature = 20
tf = cigre601.temperature_film(conductor_temperature, ambient_temperature)
v = cigre601.dynamic_viscosity(tf)
assert v == pytest.approx(1.9947e-5, abs=0.0001e-5)
def test_thermal_conductivity_of_air():
ambient_temperature = 40
conductor_temperature = 100
tf = cigre601.temperature_film(conductor_temperature, ambient_temperature)
c = cigre601.thermal_conductivity_of_air(tf)
assert c == pytest.approx(0.0286, abs=0.0001)
ambient_temperature = 20
tf = cigre601.temperature_film(conductor_temperature, ambient_temperature)
c = cigre601.thermal_conductivity_of_air(tf)
assert c == pytest.approx(0.0279, abs=0.0001)
def test_prandtl():
ambient_temperature = 40
conductor_temperature = 100
tf = cigre601.temperature_film(conductor_temperature, ambient_temperature)
pr = cigre601.prandtl(conductor.drake_constants, conductor_temperature, tf)
assert pr == pytest.approx(0.716, abs=0.001)
ambient_temperature = 20
conductor_temperature = 100
tf = cigre601.temperature_film(conductor_temperature, ambient_temperature)
pr = cigre601.prandtl(conductor.drake_constants, conductor_temperature, tf)
assert pr == pytest.approx(0.718, abs=0.001)
def test_nusselt_number():
ambient_temperature = 40
conductor_temperature = 100
wind_speed = 0.61
angle_of_attack = 60
elevation = 0
tf = cigre601.temperature_film(conductor_temperature, ambient_temperature)
Re = cigre601.reynolds_number(wind_speed, conductor.drake_constants, tf,
elevation)
Nu = cigre601.nusselt_number = nusselt.get_nusselt_function(
conductor.drake_constants)(Re, 90)
assert Nu == pytest.approx(15.495, abs=0.001)
Nu = cigre601.nusselt_number = nusselt.get_nusselt_function(
conductor.drake_constants)(Re, angle_of_attack)
assert Nu == pytest.approx(14.40, abs=0.01)
ambient_temperature = 20
wind_speed = 1.66
angle_of_attack = 80
elevation = 500
tf = cigre601.temperature_film(conductor_temperature, ambient_temperature)
Re = cigre601.reynolds_number(wind_speed, conductor.drake_constants, tf,
elevation)
Nu = cigre601.nusselt_number = nusselt.get_nusselt_function(
conductor.drake_constants)(Re, 90)
assert Nu == pytest.approx(24.73, abs=0.01)
Nu = cigre601.nusselt_number = nusselt.get_nusselt_function(
conductor.drake_constants)(Re, angle_of_attack)
assert Nu == pytest.approx(24.53, abs=0.01)
def test_reynolds_number():
ambient_temperature = 40
conductor_temperature = 100
wind_speed = 0.61
elevation = 0
tf = cigre601.temperature_film(conductor_temperature, ambient_temperature)
Re = cigre601.reynolds_number(wind_speed, conductor.drake_constants, tf,
elevation)
assert Re == pytest.approx(865, abs=0.5)
ambient_temperature = 20
wind_speed = 1.66
elevation = 500
tf = cigre601.temperature_film(conductor_temperature, ambient_temperature)
Re = cigre601.reynolds_number(wind_speed, conductor.drake_constants, tf,
elevation)
assert Re == pytest.approx(2335, abs=0.5)