def test_add_streams():
# simple example, same components
ans = {'zs': [0.4, 0.6], 'ws': [0.20679185022051716, 0.7932081497794828], 'm': 0.34847176, 'n': 10}
prod = Stream(['water', 'ethanol'], ns=[1, 2], T=300, P=1E5) + Stream(['water', 'ethanol'], ns=[3, 4], T=300, P=1E5)
assert_allclose(prod.zs, ans['zs'])
assert_allclose(prod.ws, ans['ws'])
assert_allclose(prod.m, ans['m'])
assert_allclose(prod.n, ans['n'])
# add a not a stream
with pytest.raises(Exception):
Stream(['decane', 'octane'], T=300, P=1E5, ns=[4, 5]) +1
# Add two streams, check they're the same if added in a different order
ans = {'zs': [1/6., 1/3., 1/3., 1/6.],
'ws': [0.12364762781718204, 0.3687607770917325, 0.3080280163630483, 0.1995635787280373],
'm': 0.92382298, 'n': 6}
S1 = Stream(['decane', 'octane'], T=300, P=1E5, ns=[2, 1])
S2 = Stream(['Dodecane', 'Tridecane'], T=300, P=1E5, ns=[2, 1])
prod = S1 + S2
assert_allclose(prod.ws, ans['ws'], rtol=2E-5)
assert_allclose(prod.zs, ans['zs'], rtol=2E-5)
assert_allclose(prod.m, ans['m'], rtol=1E-4)
assert_allclose(prod.n, ans['n'], rtol=2E-5)
prod = S2 + S1
assert_allclose(prod.ws, ans['ws'], rtol=2E-5)
assert_allclose(prod.zs, ans['zs'], rtol=2E-5)
assert_allclose(prod.m, ans['m'], rtol=1E-4)
assert_allclose(prod.n, ans['n'], rtol=2E-5)
def test_stream_TP_Q():
n_known = 47.43612113350473
n = Stream(T=433.0, P=680E3, Q=3800.0/3600, IDs=['CO2'], zs=[1], Q_TP=(273.15, 101325, 'g')).n
assert_allclose(n, n_known, rtol=1e-3)
n = Stream(T=433.0, P=680E3, Q=3800.0/3600, IDs=['CO2'], zs=[1], Q_TP=(273.15, 101325, '')).n
assert_allclose(n, n_known, rtol=1e-3)
n = Stream(T=433.0, P=680E3, Q=3800.0/3600, IDs=['CO2'], zs=[1], Q_TP=(273.15, 101325, None)).n
assert_allclose(n, n_known, rtol=1e-3)
def test_Stream():
Stream(['H2', 'NH3', 'CO', 'Ar', 'CH4', 'N2'],
zs=[.7371, 0, .024, .027, .013, .2475],
T=500, P=20.5E5, m=300)
# Test the pressure will be set if none is specified
obj = Stream(['methanol'], T=305, zs=[1], n=1)
assert obj.P == obj.P_default
obj = Stream(['methanol'], P=1E5, zs=[1], n=1)
assert obj.T == obj.T_default
def test_assert_component_balance():
f1 = Stream(['water', 'ethanol', 'pentane'],
zs=[.5, .4, .1],
T=300,
P=1E6,
n=50)
f2 = Stream(['water', 'methanol'], zs=[.5, .5], T=300, P=9E5, n=25)
f3 = Stream(IDs=['109-66-0', '64-17-5', '67-56-1', '7732-18-5'],
ns=[5.0, 20.0, 12.5, 37.5],
T=300,
P=850000)
assert_component_balance([f1, f2], f3)
f3 = Stream(IDs=['109-66-0', '64-17-5', '67-56-1', '7732-18-5'],
ns=[6.0, 20.0, 12.5, 37.5],
T=300,
P=850000)
with pytest.raises(Exception):
assert_component_balance([f1, f2], f3)
def test_Stream_inputs():
compositions = {
'zs': [0.5953064630759212, 0.4046935369240788],
'ws': [0.365177574313603, 0.634822425686397],
'Vfgs': [0.6, 0.4],
'Vfls': [0.3114290329842817, 0.6885709670157184]
}
inputs = {'m': 100, 'n': 3405.042096313374, 'Q': 0.11409951553902598}
flow_inputs = {
'ns': [2027.0435669809347, 1377.998529332439],
'ms': [36.517757431360295, 63.482242568639705],
'Qls': [0.036643922302061455, 0.08101987400787004],
'Qgs': [48.673177307086064, 32.448784871390714]
}
for key1, val1 in compositions.items():
for key2, val2 in inputs.items():
m = Stream(['water', 'ethanol'],
T=300,
P=1E5,
**{
key1: val1,
key2: val2
})
assert_allclose(m.n, inputs['n'])
assert_allclose(m.m, inputs['m'])
assert_allclose(m.Q, inputs['Q'])
assert_allclose(m.ns, flow_inputs['ns'])
assert_allclose(m.ms, flow_inputs['ms'])
assert_allclose(m.Qls, flow_inputs['Qls'])
assert_allclose(m.Qgs, flow_inputs['Qgs'])
for key, val in flow_inputs.items():
m = Stream(['water', 'ethanol'], T=300, P=1E5, **{key: val})
assert_allclose(m.n, inputs['n'])
assert_allclose(m.m, inputs['m'])
assert_allclose(m.Q, inputs['Q'])
assert_allclose(m.ns, flow_inputs['ns'])
assert_allclose(m.ms, flow_inputs['ms'])
assert_allclose(m.Qls, flow_inputs['Qls'])
assert_allclose(m.Qgs, flow_inputs['Qgs'])
with pytest.raises(Exception):
# two compositions specified
Stream(['water', 'ethanol'], ns=[6, 4], ws=[.4, .6], T=300, P=1E5)
with pytest.raises(Exception):
# two flow rates specified
Stream(['water', 'ethanol'], ns=[6, 4], n=10, T=300, P=1E5)
with pytest.raises(Exception):
# no composition
Stream(['water', 'ethanol'], n=1, T=300, P=1E5)
with pytest.raises(Exception):
# no flow rate
Stream(['water', 'ethanol'], zs=[.5, .5], T=300, P=1E5)
def test_Stream():
Stream(['H2', 'NH3', 'CO', 'Ar', 'CH4', 'N2'],
zs=[.7371, 0, .024, .027, .013, .2475],
T=500,
P=20.5E5,
m=300)
def test_sub_streams():
with pytest.raises(Exception):
# remove a component not present
Stream(['water', 'ethanol'], ns=[1, 2], T=300, P=1E5) - Stream(
['decane'], ns=[.5], T=300, P=1E5)
with pytest.raises(Exception):
# Remove too much of a component
Stream(['water', 'ethanol'], ns=[1, 2], T=300, P=1E5) - Stream(
['ethanol'], ns=[3], T=300, P=1E5)
# Take a component completely away
no_ethanol = Stream(['water', 'ethanol'], ns=[1, 2], T=300,
P=1E5) - Stream(['ethanol'], ns=[2], T=300, P=1E5)
assert len(no_ethanol.zs) == 1
assert_allclose(no_ethanol.zs, 1)
assert_allclose(no_ethanol.n, 1)
assert_allclose(no_ethanol.m, 0.01801528)
# basic case
m = Stream(['water', 'ethanol'], ns=[1, 2], T=300, P=1E5) - Stream(
['ethanol'], ns=[1], T=300, P=1E5)
assert_allclose(m.ns, [1, 1])
# test case
m = Stream(['water', 'ethanol', 'decane', 'pentane'],
ns=[1, 2, 3, 1E-9],
T=300,
P=1E5) - Stream(['ethanol'], ns=[2], T=300, P=1E5)
assert_allclose(m.ns, [1, 3.0, 1e-09])
assert m.CASs == ['7732-18-5', '124-18-5', '109-66-0']
# Remove a bit more of the chemical that the tolerange allows for wrt total stream flow:
with pytest.raises(Exception):
Stream(['water', 'ethanol', 'decane', 'pentane'],
ns=[1, 2, 3, 1E-9],
T=300,
P=1E5) - Stream(
['ethanol', 'pentane'], ns=[2, 1E-9 + 1E-11], T=300, P=1E5)
with pytest.raises(Exception):
Stream(['water', 'ethanol'], ns=[1, 1], T=300, P=1E5) - Stream(
['ethanol'], ns=[1 + 1E-12], T=300, P=1E5)
m = Stream(['water', 'ethanol'], ns=[1, 1], T=300, P=1E5) - Stream(
['ethanol'], ns=[1 + 9E-13], T=300, P=1E5)
assert m.CASs == ['7732-18-5']
# Relative to its own stream, removal threshold
with pytest.raises(Exception):
# test abs(ns_self[i] - nj)/ns_self[i] > 1E-9
Stream(['water', 'ethanol'], ns=[1, 1E-12], T=300, P=1E5) - Stream(
['ethanol'], ns=[1E-12 + 1E-20], T=300, P=1E5)
# test with a little less it gets removed safely, one part in nine extra of the component
m = Stream(['water', 'ethanol'], ns=[1, 1E-12], T=300, P=1E5) - Stream(
['ethanol'], ns=[1E-12 + 1E-21], T=300, P=1E5)
assert m.CASs == ['7732-18-5']
# test relative to the product flow rate, ensure we don't remove any extra that results in the extra being much more than the product
with pytest.raises(Exception):
m = Stream(['water', 'ethanol'], ns=[1E-7, 1], T=300, P=1E5) - Stream(
['ethanol'], ns=[1 + 1E-15], T=300, P=1E5)
m = Stream(['water', 'ethanol'], ns=[1E-7, 1], T=300, P=1E5) - Stream(
['ethanol'], ns=[1 + 1E-16], T=300, P=1E5)
assert_allclose(m.n, 1E-7, rtol=1E-12)
assert m.CASs == ['7732-18-5']
def test_Stream_inputs():
compositions = {'zs': [0.5953064630759212, 0.4046935369240788], 'ws': [0.365177574313603, 0.634822425686397],
'Vfgs': [0.6, 0.4], 'Vfls': [0.3114290329842817, 0.6885709670157184]}
inputs = {'m': 100, 'n': 3405.042096313374, 'Q': 0.11409951553902598}
flow_inputs = {'ns': [2027.0435669809347, 1377.998529332439], 'ms': [36.517757431360295, 63.482242568639705],
'Qls': [0.036643922302061455, 0.08101987400787004], 'Qgs': [50.561333889092964, 34.371951780014115]}
for key1, val1 in compositions.items():
for key2, val2 in inputs.items():
m = Stream(['water', 'ethanol'], T=300, P=1E5, **{key1:val1, key2:val2})
assert_allclose(m.n, inputs['n'])
assert_allclose(m.m, inputs['m'])
assert_allclose(m.Q, inputs['Q'], rtol=1e-5)
assert_allclose(m.ns, flow_inputs['ns'])
assert_allclose(m.ms, flow_inputs['ms'])
assert_allclose(m.Qls, flow_inputs['Qls'], rtol=1e-5)
assert_allclose(m.Qgs, flow_inputs['Qgs'], rtol=1e-5)
for key, val in flow_inputs.items():
m = Stream(['water', 'ethanol'], T=300, P=1E5, **{key:val})
other_tol = 1e-7 if key not in ('Qls', 'Qgs') else 1e-5
assert_allclose(m.n, inputs['n'], rtol=other_tol)
assert_allclose(m.m, inputs['m'], rtol=other_tol)
assert_allclose(m.Q, inputs['Q'], rtol=1e-5)
assert_allclose(m.ns, flow_inputs['ns'], rtol=other_tol)
assert_allclose(m.ms, flow_inputs['ms'], rtol=other_tol)
assert_allclose(m.Qls, flow_inputs['Qls'], rtol=1e-5)
assert_allclose(m.Qgs, flow_inputs['Qgs'], rtol=1e-5)
# Test ordereddict input
IDs = ['water', 'ethanol']
for key1, val1 in compositions.items():
d = OrderedDict()
for i, j in zip(IDs, val1):
d.update({i: j})
for key2, val2 in inputs.items():
m = Stream(T=300, P=1E5, **{key1:d, key2:val2})
# Check the composition
assert_allclose(m.zs, compositions['zs'], rtol=1E-6)
assert_allclose(m.zs, m.xs)
assert_allclose(m.Vfls(), compositions['Vfls'], rtol=1E-5)
assert_allclose(m.Vfgs(), compositions['Vfgs'], rtol=1E-5)
assert_allclose(m.n, inputs['n'])
assert_allclose(m.m, inputs['m'])
assert_allclose(m.Q, inputs['Q'], rtol=1e-5)
assert_allclose(m.ns, flow_inputs['ns'])
assert_allclose(m.ms, flow_inputs['ms'])
assert_allclose(m.Qls, flow_inputs['Qls'], rtol=1e-5)
assert_allclose(m.Qgs, flow_inputs['Qgs'], rtol=1e-5)
# Test ordereddict input with flow rates being given as dicts
for key, val in flow_inputs.items():
other_tol = 1e-7 if key not in ('Qls', 'Qgs') else 1e-5
d = OrderedDict()
for i, j in zip(IDs, val):
d.update({i: j})
m = Stream(T=300, P=1E5, **{key:d})
assert_allclose(m.n, inputs['n'], rtol=other_tol)
assert_allclose(m.m, inputs['m'], rtol=other_tol)
assert_allclose(m.Q, inputs['Q'], rtol=1e-5)
assert_allclose(m.ns, flow_inputs['ns'], rtol=other_tol)
assert_allclose(m.ms, flow_inputs['ms'], rtol=other_tol)
assert_allclose(m.Qls, flow_inputs['Qls'], rtol=1e-5)
assert_allclose(m.Qgs, flow_inputs['Qgs'], rtol=1e-5)
with pytest.raises(Exception):
# two compositions specified
Stream(['water', 'ethanol'], ns=[6, 4], ws=[.4, .6], T=300, P=1E5)
with pytest.raises(Exception):
# two flow rates specified
Stream(['water', 'ethanol'], ns=[6, 4], n=10, T=300, P=1E5)
with pytest.raises(Exception):
# no composition
Stream(['water', 'ethanol'], n=1, T=300, P=1E5)
with pytest.raises(Exception):
# no flow rate
Stream(['water', 'ethanol'], zs=[.5, .5], T=300, P=1E5)
