def test_heat_ex(self):
"""
Test component properties of heat exchanger.
"""
instance = heat_exchanger('heat exchanger')
self.setup_heat_exchanger_network(instance)
# design specification
instance.set_attr(pr1=0.98,
pr2=0.98,
ttd_u=5,
design=['pr1', 'pr2', 'ttd_u'],
offdesign=['zeta1', 'zeta2', 'kA'])
self.c1.set_attr(T=120, p=3, fluid={'Ar': 0, 'H2O': 1})
self.c2.set_attr(T=70)
self.c3.set_attr(T=40, p=5, fluid={'Ar': 1, 'H2O': 0})
b = bus('heat transfer', P=-80e3)
b.add_comps({'c': instance})
self.nw.add_busses(b)
self.nw.solve('design')
self.nw.save('tmp')
# check heat transfer
Q = self.c1.m.val_SI * (self.c2.h.val_SI - self.c1.h.val_SI)
td_log = (
(self.c2.T.val - self.c3.T.val - self.c1.T.val + self.c4.T.val) /
np.log((self.c2.T.val - self.c3.T.val) /
(self.c1.T.val - self.c4.T.val)))
kA = round(-Q / td_log, 0)
msg = ('Value of heat transfer must be ' + str(round(Q, 0)) + ', is ' +
str(round(instance.Q.val, 0)) + '.')
eq_(round(Q, 0), round(instance.Q.val, 0), msg)
# check upper terminal temperature difference
msg = ('Value of terminal temperature difference must be ' +
str(round(instance.ttd_u.val, 1)) + ', is ' +
str(round(self.c1.T.val - self.c4.T.val, 1)) + '.')
eq_(round(instance.ttd_u.val, 1),
round(self.c1.T.val - self.c4.T.val, 1), msg)
# check lower terminal temperature difference
self.c2.set_attr(T=np.nan)
instance.set_attr(ttd_l=20)
self.nw.solve('design')
msg = ('Value of terminal temperature difference must be ' +
str(instance.ttd_l.val) + ', is ' +
str(self.c2.T.val - self.c3.T.val) + '.')
eq_(round(self.c2.T.val - self.c3.T.val, 1),
round(instance.ttd_l.val, 1), msg)
# check specified kA value (by offdesign parameter), reset temperatures
# to design state
self.c2.set_attr(T=70)
instance.set_attr(ttd_l=np.nan)
self.nw.solve('offdesign', design_path='tmp')
msg = ('Value of heat flow must be ' + str(instance.Q.val) + ', is ' +
str(round(Q, 0)) + '.')
eq_(round(Q, 0), round(instance.Q.val, 0), msg)
msg = ('Value of heat transfer coefficient must be ' + str(kA) +
', is ' + str(round(instance.kA.val, 0)) + '.')
eq_(kA, round(instance.kA.val, 0), msg)
# trigger negative lower terminal temperature difference as result
self.c4.set_attr(T=np.nan)
self.c2.set_attr(T=30)
self.nw.solve('design')
msg = ('Value of upper terminal temperature differences must be '
'smaller than zero, is ' + str(round(instance.ttd_l.val, 1)) +
'.')
eq_(True, instance.ttd_l.val < 0, msg)
# trigger negative upper terminal temperature difference as result
self.c4.set_attr(T=100)
self.c2.set_attr(h=200e3, T=np.nan)
instance.set_attr(pr1=0.98,
pr2=0.98,
ttd_u=np.nan,
design=['pr1', 'pr2'])
self.c1.set_attr(h=150e3, T=np.nan)
self.c3.set_attr(T=40)
self.nw.solve('design')
msg = ('Value of upper terminal temperature differences must be '
'smaller than zero, is ' + str(round(instance.ttd_u.val, 1)) +
'.')
eq_(True, instance.ttd_u.val < 0, msg)
shutil.rmtree('./tmp', ignore_errors=True)
def setup(self):
# %% network
self.nw = network(fluids=['water', 'NH3'],
T_unit='C',
p_unit='bar',
h_unit='kJ / kg',
m_unit='kg / s')
# %% components
# sources & sinks
c_in = source('coolant in')
cb = source('consumer back flow')
cf = sink('consumer feed flow')
amb_in = source('source ambient')
amb_out = sink('sink ambient')
ic_in = source('source intercool')
ic_out = sink('sink intercool')
c_out = sink('coolant out')
# consumer system
cd = heat_exchanger('condenser')
rp = pump('recirculation pump')
cons = heat_exchanger_simple('consumer')
# evaporator system
va = valve('valve')
dr = drum('drum')
ev = heat_exchanger('evaporator')
su = heat_exchanger('superheater')
pu = pump('pump evaporator')
# compressor-system
cp1 = compressor('compressor 1')
cp2 = compressor('compressor 2')
he = heat_exchanger('intercooler')
# busses
self.power = bus('total compressor power')
self.power.add_comps({'c': cp1}, {'c': cp2})
self.heat = bus('total delivered heat')
self.heat.add_comps({'c': cd, 'char': -1})
self.nw.add_busses(self.power, self.heat)
# %% connections
# consumer system
c_in_cd = connection(c_in, 'out1', cd, 'in1')
cb_rp = connection(cb, 'out1', rp, 'in1')
rp_cd = connection(rp, 'out1', cd, 'in2')
self.cd_cons = connection(cd, 'out2', cons, 'in1')
cons_cf = connection(cons, 'out1', cf, 'in1')
self.nw.add_conns(c_in_cd, cb_rp, rp_cd, self.cd_cons, cons_cf)
# connection condenser - evaporator system
cd_va = connection(cd, 'out1', va, 'in1')
self.nw.add_conns(cd_va)
# evaporator system
va_dr = connection(va, 'out1', dr, 'in1')
dr_pu = connection(dr, 'out1', pu, 'in1')
pu_ev = connection(pu, 'out1', ev, 'in2')
ev_dr = connection(ev, 'out2', dr, 'in2')
dr_su = connection(dr, 'out2', su, 'in2')
self.nw.add_conns(va_dr, dr_pu, pu_ev, ev_dr, dr_su)
self.amb_in_su = connection(amb_in, 'out1', su, 'in1')
su_ev = connection(su, 'out1', ev, 'in1')
ev_amb_out = connection(ev, 'out1', amb_out, 'in1')
self.nw.add_conns(self.amb_in_su, su_ev, ev_amb_out)
# connection evaporator system - compressor system
su_cp1 = connection(su, 'out2', cp1, 'in1')
self.nw.add_conns(su_cp1)
# compressor-system
cp1_he = connection(cp1, 'out1', he, 'in1')
he_cp2 = connection(he, 'out1', cp2, 'in1')
cp2_c_out = connection(cp2, 'out1', c_out, 'in1')
ic_in_he = connection(ic_in, 'out1', he, 'in2')
he_ic_out = connection(he, 'out2', ic_out, 'in1')
self.nw.add_conns(cp1_he, he_cp2, ic_in_he, he_ic_out, cp2_c_out)
# %% component parametrization
# condenser system
x = np.array([
0, 0.0625, 0.125, 0.1875, 0.25, 0.3125, 0.375, 0.4375, 0.5, 0.5625,
0.6375, 0.7125, 0.7875, 0.9, 0.9875, 1, 1.0625, 1.125, 1.175,
1.2125, 1.2375, 1.25
])
y = np.array([
0.0076, 0.1390, 0.2731, 0.4003, 0.5185, 0.6263, 0.7224, 0.8056,
0.8754, 0.9312, 0.9729, 1.0006, 1.0203, 1.0158, 1.0051, 1.0000,
0.9746, 0.9289, 0.8832, 0.8376, 0.7843, 0.7614
])
rp.set_attr(eta_s=0.8,
design=['eta_s'],
offdesign=['eta_s_char'],
eta_s_char=dc_cc(func=char_line(x, y), param='m'))
cons.set_attr(pr=1, design=['pr'], offdesign=['zeta'])
# evaporator system
x = np.linspace(0, 2.5, 26)
y = 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
])
kA_char1 = dc_cc(func=char_line(x, y), param='m')
x = np.array([
0.0100, 0.0400, 0.0700, 0.1100, 0.1500, 0.2000, 0.2500, 0.3000,
0.3500, 0.4000, 0.4500, 0.5000, 0.5500, 0.6000, 0.6500, 0.7000,
0.7500, 0.8000, 0.8500, 0.9000, 0.9500, 1.0000, 1.5000, 2.0000
])
y = np.array([
0.0185, 0.0751, 0.1336, 0.2147, 0.2997, 0.4118, 0.5310, 0.6582,
0.7942, 0.9400, 0.9883, 0.9913, 0.9936, 0.9953, 0.9966, 0.9975,
0.9983, 0.9988, 0.9992, 0.9996, 0.9998, 1.0000, 1.0008, 1.0014
])
kA_char2 = dc_cc(func=char_line(x, y), param='m')
ev.set_attr(pr1=1,
pr2=.999,
ttd_l=5,
design=['ttd_l'],
offdesign=['kA'],
kA_char1=kA_char1,
kA_char2=kA_char2)
# no kA modification for hot side!
x = np.array([0, 1])
y = np.array([1, 1])
kA_char1 = dc_cc(func=char_line(x, y), param='m')
# characteristic line for superheater kA
x = np.array(
[0, 0.045, 0.136, 0.244, 0.43, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2])
y = np.array(
[0, 0.037, 0.112, 0.207, 0.5, 0.8, 0.85, 0.9, 0.95, 1, 1.04, 1.07])
kA_char2 = dc_cc(func=char_line(x, y), param='m')
su.set_attr(kA_char1=kA_char1,
kA_char2=kA_char2,
offdesign=['zeta1', 'zeta2', 'kA'])
x = np.array([
0, 0.0625, 0.125, 0.1875, 0.25, 0.3125, 0.375, 0.4375, 0.5, 0.5625,
0.6375, 0.7125, 0.7875, 0.9, 0.9875, 1, 1.0625, 1.125, 1.175,
1.2125, 1.2375, 1.25
])
y = np.array([
0.0076, 0.1390, 0.2731, 0.4003, 0.5185, 0.6263, 0.7224, 0.8056,
0.8754, 0.9312, 0.9729, 1.0006, 1.0203, 1.0158, 1.0051, 1.0000,
0.9746, 0.9289, 0.8832, 0.8376, 0.7843, 0.7614
])
pu.set_attr(eta_s=0.8,
design=['eta_s'],
offdesign=['eta_s_char'],
eta_s_char=dc_cc(func=char_line(x, y), param='m'))
# compressor system
x = np.array([0, 0.4, 1, 1.2])
y = np.array([0.5, 0.9, 1, 1.1])
cp1.set_attr(eta_s=0.8,
design=['eta_s'],
offdesign=['eta_s_char'],
eta_s_char=dc_cc(func=char_line(x, y), param='m'))
cp2.set_attr(eta_s=0.8,
design=['eta_s'],
offdesign=['eta_s_char'],
eta_s_char=dc_cc(func=char_line(x, y), param='m'))
# characteristic line for intercooler kA
x = np.linspace(0, 2.5, 26)
y = np.array([
0.0000, 0.2455, 0.3747, 0.4798, 0.5718, 0.6552, 0.7323, 0.8045,
0.8727, 0.9378, 1.0000, 1.0599, 1.1176, 1.1736, 1.2278, 1.2806,
1.3320, 1.3822, 1.4313, 1.4792, 1.5263, 1.5724, 1.6176, 1.6621,
1.7058, 1.7488
])
# x = np.array([0, 1])
# y = np.array([1, 1])
kA_char1 = dc_cc(func=char_line(x, y), param='m')
x = np.linspace(0, 2.5, 26)
y = 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
])
# x = np.array([0, 1])
# y = np.array([1, 1])
kA_char2 = dc_cc(func=char_line(x, y), param='m')
he.set_attr(kA_char1=kA_char1,
kA_char2=kA_char2,
offdesign=['zeta1', 'zeta2', 'kA'])
# characteristic line for condenser kA
x = np.linspace(0, 2.5, 26)
y = np.array([
0.0000, 0.2455, 0.3747, 0.4798, 0.5718, 0.6552, 0.7323, 0.8045,
0.8727, 0.9378, 1.0000, 1.0599, 1.1176, 1.1736, 1.2278, 1.2806,
1.3320, 1.3822, 1.4313, 1.4792, 1.5263, 1.5724, 1.6176, 1.6621,
1.7058, 1.7488
])
kA_char1 = dc_cc(func=char_line(x, y), param='m')
x = np.linspace(0, 2.5, 26)
y = 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
])
kA_char2 = dc_cc(func=char_line(x, y), param='m')
cd.set_attr(kA_char1=kA_char1,
kA_char2=kA_char2,
pr2=0.9998,
design=['pr2'],
offdesign=['zeta2', 'kA'])
# %% connection parametrization
# condenser system
c_in_cd.set_attr(fluid={'water': 0, 'NH3': 1}, p=60)
rp_cd.set_attr(T=60, fluid={'water': 1, 'NH3': 0}, p=10)
self.cd_cons.set_attr(T=105)
cons_cf.set_attr(h=ref(cb_rp, 1, 0), p=ref(cb_rp, 1, 0))
cd_va.set_attr(p=ref(c_in_cd, 1, -1000),
Td_bp=-5,
h0=500,
design=['Td_bp'])
# evaporator system cold side
pu_ev.set_attr(m=ref(va_dr, 10, 0), p0=5)
dr_su.set_attr(p0=5, T=5)
su_cp1.set_attr(p=ref(dr_su, 1, -5000),
Td_bp=5,
h0=1700,
design=['Td_bp', 'p'])
# evaporator system hot side
self.amb_in_su.set_attr(m=20, T=12, p=1, fluid={'water': 1, 'NH3': 0})
su_ev.set_attr(p=ref(self.amb_in_su, 1, -100), design=['p'])
ev_amb_out.set_attr()
# compressor-system
cp1_he.set_attr(p=15)
he_cp2.set_attr(T=40, p=ref(cp1_he, 1, -1000), design=['T', 'p'])
ic_in_he.set_attr(p=1, T=20, m=5, fluid={'water': 1, 'NH3': 0})
he_ic_out.set_attr(p=ref(ic_in_he, 1, -200), design=['p'])
cp2_c_out.set_attr(p=ref(c_in_cd, 1, 0), h=ref(c_in_cd, 1, 0))
p_range=[1, 100],
T_range=[10, 1500],
h_range=[10, 4000])
# %% components
# gas turbine part
comp = compressor('compressor')
comp_fuel = compressor('fuel compressor')
c_c = combustion_chamber('combustion')
g_turb = turbine('gas turbine')
CH4 = source('fuel source')
air = source('ambient air')
# waste heat recovery
suph = heat_exchanger('superheater')
evap = heat_exchanger('evaporator')
drum = drum('drum')
eco = heat_exchanger('economizer')
ch = sink('chimney')
# steam turbine part
turb_hp = turbine('steam turbine high pressure')
cond_dh = condenser('district heating condenser')
mp_split = splitter('mp split')
turb_lp = turbine('steam turbine low pressure')
cond = condenser('condenser')
merge = merge('merge')
pump1 = pump('feed water pump 1')
pump2 = pump('feed water pump 2')
ls_out = sink('ls sink')
