def test_get_fluid_str(self):
"""
Tests whether the fluid string is correct
"""
self.assertEqual(Fluid.get_fluid_str(FluidType.ETHYL_ALCOHOL, -0.1),
'INCOMP::MEA[0.0000]')
self.assertEqual(Fluid.get_fluid_str(FluidType.ETHYL_ALCOHOL, 0.8),
'INCOMP::MEA[0.6000]')
def _add_fluid_props_inst(self, inputs: dict) -> None:
"""
Inits the fluid properties class
:param inputs: fluid input dict
"""
self.fluid = Fluid(inputs)
def test_dens(self):
"""
Tests fluid density calculation routine
Reference values come from Cengel & Ghajar 2015
Cengel, Y.A., & Ghajar, A.J. 2015. Heat and Mass Transfer, Fundamentals and Applications.
McGraw-Hill. New York, New York.
"""
# TODO: convert to fractional error
tolerance = 1.0
tst = Fluid({'fluid-type': 'water'})
self.assertAlmostEqual(tst.calc_density(20), 998.0, delta=tolerance)
self.assertAlmostEqual(tst.calc_density(40), 992.1, delta=tolerance)
self.assertAlmostEqual(tst.calc_density(60), 983.3, delta=tolerance)
self.assertAlmostEqual(tst.calc_density(80), 971.8, delta=tolerance)
def test_get_mu(self):
"""
Tests fluid viscosity calculations
Reference values come from Cengel & Ghajar 2015
Cengel, Y.A., & Ghajar, A.J. 2015. Heat and Mass Transfer, Fundamentals and Applications.
McGraw-Hill. New York, New York.
"""
# TODO: convert to fractional error
tolerance = 1E-4
tst = Fluid({'fluid-type': 'water'})
self.assertAlmostEqual(tst.get_mu(20), 1.002E-3, delta=tolerance)
self.assertAlmostEqual(tst.get_mu(40), 0.653E-3, delta=tolerance)
self.assertAlmostEqual(tst.get_mu(60), 0.467E-3, delta=tolerance)
self.assertAlmostEqual(tst.get_mu(80), 0.355E-3, delta=tolerance)
def test_get_pr(self):
"""
Tests fluid Prandtl number calculations
Reference values come from Cengel & Ghajar 2015
Cengel, Y.A., & Ghajar, A.J. 2015. Heat and Mass Transfer, Fundamentals and Applications.
McGraw-Hill. New York, New York.
"""
# TODO: convert to fractional error
tolerance = 1E-1
tst = Fluid({'fluid-type': 'water'})
self.assertAlmostEqual(tst.get_pr(20), 7.01, delta=tolerance)
self.assertAlmostEqual(tst.get_pr(40), 4.32, delta=tolerance)
self.assertAlmostEqual(tst.get_pr(60), 2.99, delta=tolerance)
self.assertAlmostEqual(tst.get_pr(80), 2.22, delta=tolerance)
def test_get_cp(self):
"""
Tests fluid specific heat calculation routine
Reference values come from Cengel & Ghajar 2015
Cengel, Y.A., & Ghajar, A.J. 2015. Heat and Mass Transfer, Fundamentals and Applications.
McGraw-Hill. New York, New York.
"""
# TODO: convert to fractional error
tolerance = 4.0
tst = Fluid({'fluid-type': 'water'})
self.assertAlmostEqual(tst.get_cp(20), 4182, delta=tolerance)
self.assertAlmostEqual(tst.get_cp(40), 4179, delta=tolerance)
self.assertAlmostEqual(tst.get_cp(60), 4185, delta=tolerance)
self.assertAlmostEqual(tst.get_cp(80), 4197, delta=tolerance)
def test_get_k(self):
"""
Tests fluid conductivity calculations
Reference values come from Cengel & Ghajar 2015
Cengel, Y.A., & Ghajar, A.J. 2015. Heat and Mass Transfer, Fundamentals and Applications.
McGraw-Hill. New York, New York.
"""
# TODO: convert to fractional error
tolerance = 1E-2
tst = Fluid({'fluid-type': 'water'})
self.assertAlmostEqual(tst.get_k(20), 0.598, delta=tolerance)
self.assertAlmostEqual(tst.get_k(40), 0.631, delta=tolerance)
self.assertAlmostEqual(tst.get_k(60), 0.654, delta=tolerance)
self.assertAlmostEqual(tst.get_k(80), 0.670, delta=tolerance)
def test_get_rho_cp(self):
"""
Tests fluid density and specific heat calculation routines
Reference values come from Cengel & Ghajar 2015
Cengel, Y.A., & Ghajar, A.J. 2015. Heat and Mass Transfer, Fundamentals and Applications.
McGraw-Hill. New York, New York.
"""
tolerance = 0.01
tst = Fluid({'fluid-type': 'water'})
tst_val = tst.get_rho_cp(20)
ref_val = 998.0 * 4182
err_frac = (tst_val - ref_val) / ref_val
self.assertAlmostEqual(err_frac, 0, delta=tolerance)
tst_val = tst.get_rho_cp(40)
ref_val = 992.1 * 4179
err_frac = (tst_val - ref_val) / ref_val
self.assertAlmostEqual(err_frac, 0, delta=tolerance)
tst_val = tst.get_rho_cp(60)
ref_val = 983.3 * 4185
err_frac = (tst_val - ref_val) / ref_val
self.assertAlmostEqual(err_frac, 0, delta=tolerance)
tst_val = tst.get_rho_cp(80)
ref_val = 971.8 * 4197
err_frac = (tst_val - ref_val) / ref_val
self.assertAlmostEqual(err_frac, 0, delta=tolerance)
def test_init(self):
tst_w = Fluid({'fluid-type': 'water'})
self.assertEqual(tst_w.fluid_enum, FluidType.WATER)
self.assertEqual(tst_w.fluid_str, 'WATER')
tst_ea = Fluid({'fluid-type': 'EA', 'concentration': 50})
self.assertEqual(tst_ea.fluid_enum, FluidType.ETHYL_ALCOHOL)
self.assertEqual(tst_ea.fluid_str, 'INCOMP::MEA[0.5000]')
tst_eg = Fluid({'fluid-type': 'EG', 'concentration': 50})
self.assertEqual(tst_eg.fluid_enum, FluidType.ETHYLENE_GLYCOL)
self.assertEqual(tst_eg.fluid_str, 'INCOMP::MEG[0.5000]')
tst_pg = Fluid({'fluid-type': 'PG', 'concentration': 50})
self.assertEqual(tst_pg.fluid_enum, FluidType.PROPYLENE_GLYCOL)
self.assertEqual(tst_pg.fluid_str, 'INCOMP::MPG[0.5000]')
self.assertRaises(
ValueError, lambda: Fluid({
'fluid-type': 'Not A Fluid',
'concentration': 0
}))