nw.add_conns(sf_comb, amb_comb, comb_fg)
cw1_chp1 = Connection(cw_in1, 'out1', chp, 'in1')
cw2_chp2 = Connection(cw_in2, 'out1', chp, 'in2')
nw.add_conns(cw1_chp1, cw2_chp2)
chp1_cw = Connection(chp, 'out1', cw_out1, 'in1')
chp2_cw = Connection(chp, 'out2', cw_out2, 'in1')
nw.add_conns(chp1_cw, chp2_cw)
# %% component parameters
# set combustion chamber fuel, air to stoichometric air ratio and thermal input
chp.set_attr(pr1=0.99, pr2=0.99, P=-10e6, lamb=1.2)
# %% connection parameters
# air from abient (ambient pressure and temperature), air composition must be
# stated component wise.
amb_comb.set_attr(p=5,
T=30,
fluid={
'Ar': 0.0129,
'N2': 0.7553,
'H2O': 0,
'CH4': 0,
'CO2': 0.0004,
'O2': 0.2314
})
def test_CombustionEngine(self):
"""Test component properties of combustion engine."""
instance = CombustionEngine('combustion engine')
self.setup_CombustionEngine_network(instance)
air = {
'N2': 0.7556,
'O2': 0.2315,
'Ar': 0.0129,
'H2O': 0,
'CO2': 0,
'CH4': 0
}
fuel = {'N2': 0, 'O2': 0, 'Ar': 0, 'H2O': 0, 'CO2': 0.04, 'CH4': 0.96}
water1 = {'N2': 0, 'O2': 0, 'Ar': 0, 'H2O': 1, 'CO2': 0, 'CH4': 0}
water2 = {'N2': 0, 'O2': 0, 'Ar': 0, 'H2O': 1, 'CO2': 0, 'CH4': 0}
# connection parametrisation
instance.set_attr(pr1=0.99,
pr2=0.99,
lamb=1.0,
design=['pr1', 'pr2'],
offdesign=['zeta1', 'zeta2'])
self.c1.set_attr(p=5, T=30, fluid=air)
self.c2.set_attr(T=30, fluid=fuel)
self.c4.set_attr(p=3, T=60, m=50, fluid=water1)
self.c5.set_attr(p=3, T=80, m=50, fluid=water2)
# create busses
TI = Bus('thermal input')
Q1 = Bus('heat output 1')
Q2 = Bus('heat output 2')
Q = Bus('heat output')
Qloss = Bus('thermal heat loss')
TI.add_comps({'comp': instance, 'param': 'TI'})
Q1.add_comps({'comp': instance, 'param': 'Q1'})
Q2.add_comps({'comp': instance, 'param': 'Q2'})
Q.add_comps({'comp': instance, 'param': 'Q'})
Qloss.add_comps({'comp': instance, 'param': 'Qloss'})
self.nw.add_busses(TI, Q1, Q2, Q, Qloss)
# test specified thermal input bus value
ti = 1e6
TI.set_attr(P=ti)
self.nw.solve('design')
convergence_check(self.nw.lin_dep)
self.nw.save('tmp')
# calculate in offdesign mode
self.nw.solve('offdesign', init_path='tmp', design_path='tmp')
convergence_check(self.nw.lin_dep)
msg = ('Value of thermal input must be ' + str(TI.P.val) + ', is ' +
str(instance.ti.val) + '.')
assert round(TI.P.val, 1) == round(instance.ti.val, 1), msg
# test specified thermal input in component
TI.set_attr(P=np.nan)
instance.set_attr(ti=ti)
self.nw.solve('offdesign', init_path='tmp', design_path='tmp')
convergence_check(self.nw.lin_dep)
msg = ('Value of thermal input must be ' + str(ti) + ', is ' +
str(instance.ti.val) + '.')
assert round(ti, 1) == round(instance.ti.val, 1), msg
instance.set_attr(ti=None)
# test specified heat output 1 bus value
Q1.set_attr(P=instance.Q1.val)
self.nw.solve('offdesign', init_path='tmp', design_path='tmp')
convergence_check(self.nw.lin_dep)
# heat output is at design point value, thermal input must therefore
# not have changed
msg = ('Value of thermal input must be ' + str(ti) + ', is ' +
str(instance.ti.val) + '.')
assert round(ti, 1) == round(instance.ti.val, 1), msg
# calculate heat output over cooling loop
heat1 = self.c4.m.val_SI * (self.c6.h.val_SI - self.c4.h.val_SI)
msg = ('Value of heat output 1 must be ' + str(-heat1) + ', is ' +
str(instance.Q1.val) + '.')
assert round(heat1, 1) == -round(instance.Q1.val, 1), msg
Q1.set_attr(P=np.nan)
# test specified heat output 2 bus value
Q2.set_attr(P=1.2 * instance.Q2.val)
self.nw.solve('offdesign', init_path='tmp', design_path='tmp')
convergence_check(self.nw.lin_dep)
# calculate heat output over cooling loop
heat2 = self.c5.m.val_SI * (self.c7.h.val_SI - self.c5.h.val_SI)
msg = ('Value of heat output 2 must be ' + str(-heat2) + ', is ' +
str(instance.Q2.val) + '.')
assert round(heat2, 1) == -round(instance.Q2.val, 1), msg
# test specified heat output 2 in component
Q2.set_attr(P=np.nan)
instance.set_attr(Q2=-heat2)
self.nw.solve('offdesign', init_path='tmp', design_path='tmp')
convergence_check(self.nw.lin_dep)
heat2 = self.c5.m.val_SI * (self.c7.h.val_SI - self.c5.h.val_SI)
msg = ('Value of heat output 2 must be ' + str(-heat2) + ', is ' +
str(instance.Q2.val) + '.')
assert round(heat2, 1) == -round(instance.Q2.val, 1), msg
# test total heat output bus value
instance.set_attr(Q2=np.nan)
Q.set_attr(P=1.5 * instance.Q1.val)
self.nw.solve('offdesign', init_path='tmp', design_path='tmp')
convergence_check(self.nw.lin_dep)
heat = (self.c4.m.val_SI * (self.c6.h.val_SI - self.c4.h.val_SI) +
self.c5.m.val_SI * (self.c7.h.val_SI - self.c5.h.val_SI))
msg = ('Value of total heat output must be ' + str(Q.P.val) + ', is ' +
str(-heat) + '.')
assert round(Q.P.val, 1) == -round(heat, 1), msg
# test specified heat loss bus value
Q.set_attr(P=np.nan)
Qloss.set_attr(P=-1e5)
self.nw.solve('offdesign', init_path='tmp', design_path='tmp')
convergence_check(self.nw.lin_dep)
msg = ('Value of heat loss must be ' + str(Qloss.P.val) + ', is ' +
str(instance.Qloss.val) + '.')
assert round(Qloss.P.val, 1) == round(instance.Qloss.val, 1), msg
shutil.rmtree('./tmp', ignore_errors=True)
# heat to power
x = np.array([0.550, 0.660, 0.770, 0.880, 0.990, 1.100])
y = np.array([0.238, 0.219, 0.203, 0.190, 0.180, 0.173])
Q1_char = dict(char_func=CharLine(x, y))
Q2_char = dict(char_func=CharLine(x, y))
# heat loss to power
x = np.array([0.50, 0.7500, 0.90, 1.000, 1.050])
y = np.array([0.32, 0.3067, 0.30, 0.295, 0.293])
Qloss_char = dict(char_func=CharLine(x, y))
# set combustion chamber fuel, air to stoichometric air ratio and thermal input
ice.set_attr(pr1=0.98,
lamb=1.0,
design=['pr1'],
offdesign=['zeta1'],
tiP_char=tiP_char,
Q1_char=Q1_char,
Q2_char=Q2_char,
Qloss_char=Qloss_char)
# flue gas cooler
x1 = np.array([
0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5,
1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5
])
y1 = np.array([
0.000, 0.164, 0.283, 0.389, 0.488, 0.581, 0.670, 0.756, 0.840, 0.921,
1.000, 1.078, 1.154, 1.228, 1.302, 1.374, 1.446, 1.516, 1.585, 1.654,
1.722, 1.789, 1.855, 1.921, 1.986, 2.051
])