def test_heat_ex_simple(self):
"""
Test component properties of simple heat exchanger.
"""
instance = cmp.heat_exchanger_simple('heat exchanger')
c1, c2 = self.setup_network_11(instance)
fl = {'N2': 0, 'O2': 0, 'Ar': 0, 'INCOMP::DowQ': 0, 'H2O': 1, 'NH3': 0, 'CO2': 0, 'CH4': 0}
c1.set_attr(fluid=fl, m=1, p=10, T=100)
# trigger heat exchanger parameter groups
instance.set_attr(hydro_group='HW', L=100, ks=100, pr=0.99, Tamb=20)
instance.hydro_group.is_set = True
instance.kA_group.is_set = True
self.nw.solve('design', init_only=True)
eq_(instance.hydro_group.is_set, False, 'Hydro group must no be set, if one parameter is missing!')
eq_(instance.kA_group.is_set, False, 'kA group must no be set, if one parameter is missing!')
instance.set_attr(hydro_group='HW', D='var', L=100, ks=100, pr=0.99, Tamb=20)
b = con.bus('heat', P=-1e5)
b.add_comps({'c': instance})
self.nw.add_busses(b)
self.nw.solve('design')
eq_(round(c2.p.val_SI / c1.p.val_SI, 2), round(instance.pr.val, 2), 'Value of pressure ratio must be ' + str(c2.p.val_SI / c1.p.val_SI) + ', is ' + str(instance.pr.val) + '.')
zeta = instance.zeta.val
instance.set_attr(D=instance.D.val, zeta='var', pr=np.nan)
instance.D.is_var = False
self.nw.solve('design')
eq_(round(zeta, 1), round(instance.zeta.val, 1), 'Value of zeta must be ' + str(zeta) + ', is ' + str(instance.zeta.val) + '.')
pr = instance.pr.val
instance.set_attr(zeta=np.nan, pr='var')
self.nw.solve('design')
eq_(round(pr, 2), round(instance.pr.val, 2), 'Value of pressure ratio must be ' + str(pr) + ', is ' + str(instance.pr.val) + '.')
instance.set_attr(kA='var', pr=np.nan)
b.set_attr(P=-5e4)
self.nw.solve('design')
# due to heat output being half of reference (for Tamb) kA should be somewhere near to that (actual value is 677)
eq_(677, round(instance.kA.val, 0), 'Value of heat transfer coefficient must be ' + str(677) + ', is ' + str(instance.kA.val) + '.')
def create_comps(self):
self.num_i = 1
self.num_o = 1
self.inlet = cmp.subsys_interface(label=self.label + '_inlet',
num_inter=self.num_i)
self.outlet = cmp.subsys_interface(label=self.label + '_outlet',
num_inter=self.num_o)
self.splitter = []
self.merge = []
self.heat_ex = []
self.valve = []
self.pipe_feed = []
self.pipe_back = []
for i in range(self.num_consumer - 1):
j = str(i)
self.splitter += [
cmp.splitter(label=self.label + '_splitter_' + j)
]
self.merge += [cmp.merge(label=self.label + '_merge_' + j)]
self.heat_ex += [
cmp.heat_exchanger_simple(label=self.label +
'_heat exchanger_' + j,
mode='man')
]
self.valve += [
cmp.valve(label=self.label + '_valve_' + j, mode='man')
]
self.pipe_feed += [
cmp.pipe(label=self.label + '_pipe feed_' + j,
offdesign=['kA'])
]
self.pipe_back += [
cmp.pipe(label=self.label + '_pipe back_' + j,
offdesign=['kA'])
]
self.heat_ex += [
cmp.heat_exchanger_simple(label=self.label + '_heat exchanger_' +
str(i + 1),
mode='man')
]
# sources & sinks
c_in = cmp.source('coolant in')
cb = cmp.source('consumer back flow')
cf = cmp.sink('consumer feed flow')
amb_in = cmp.source('source ambient')
amb_out = cmp.sink('sink ambient')
cp1 = cmp.sink('compressor 1')
# consumer system
cd = cmp.condenser('condenser')
rp = cmp.pump('recirculation pump')
cons = cmp.heat_exchanger_simple('consumer')
# evaporator system
ves = cmp.vessel('vessel')
dr = cmp.drum('drum')
ev = cmp.heat_exchanger('evaporator')
su = cmp.heat_exchanger('superheater')
pu = cmp.pump('pump evaporator')
# %% connections
# consumer system
c_in_cd = con.connection(c_in, 'out1', cd, 'in1')
# turbine part valve_turb = cmp.valve(label='valve_turb') turbine_hp = cmp.turbine(label='turbine_hp') split = cmp.splitter(label='splitter1') turbine_lp = cmp.turbine(label='turbine_lp') # condenser and preheater condenser = cmp.condenser(label='condenser') preheater = cmp.condenser(label='preheater') valve_pre = cmp.valve(label='valve_pre') valve = cmp.valve(label='valve1') merge = cmp.merge(label='merge1') # feed water pump = cmp.pump(label='pump') steam_generator = cmp.heat_exchanger_simple(label='steam generator') # sources and sinks source = cmp.source(label='source') sink = cmp.sink(label='sink') # for cooling water source_cw = cmp.source(label='source_cw') sink_cw = cmp.sink(label='sink_cw') # %% connections # turbine part fs_in = con.connection(source, 'out1', valve_turb, 'in1') fs = con.connection(valve_turb, 'out1', turbine_hp, 'in1') ext = con.connection(turbine_hp, 'out1', split, 'in1')
T_range=[273.25, 373.15],
p_range=[1, 20],
h_range=[1, 1000])
# components
fc_in = cmp.source('from consumer inflow')
fc_out = cmp.sink('from consumer outflow')
pu = cmp.pump('pump')
sp = cmp.splitter('splitter', num_out=3)
# bhe:
bhe_name = 'BHE1'
assert 'BHE1' in bhe_name, "BHE should be named with 'BHE1'"
bhe1 = cmp.heat_exchanger_simple(bhe_name)
bhe_name = 'BHE2'
assert 'BHE2' in bhe_name, "BHE should be named with 'BHE2'"
bhe2 = cmp.heat_exchanger_simple(bhe_name)
bhe_name = 'BHE3'
assert 'BHE3' in bhe_name, "BHE should be named with 'BHE3'"
bhe3 = cmp.heat_exchanger_simple(bhe_name)
mg = cmp.merge('merge', num_in=3)
cons = cmp.heat_exchanger_simple('consumer')
# connections
# inlet
fc_pu = con.connection(fc_in, 'out1', pu, 'in1')
def setup(self):
# %% network
self.nw = nwk.network(fluids=['water', 'NH3'],
T_unit='C',
p_unit='bar',
h_unit='kJ / kg',
m_unit='kg / s')
# %% components
# sources & sinks
c_in = cmp.source('coolant in')
cb = cmp.source('consumer back flow')
cf = cmp.sink('consumer feed flow')
amb_in = cmp.source('source ambient')
amb_out = cmp.sink('sink ambient')
ic_in = cmp.source('source intercool')
ic_out = cmp.sink('sink intercool')
c_out = cmp.sink('coolant out')
# consumer system
cd = cmp.heat_exchanger('condenser')
rp = cmp.pump('recirculation pump')
cons = cmp.heat_exchanger_simple('consumer')
# evaporator system
va = cmp.valve('valve')
dr = cmp.drum('drum')
ev = cmp.heat_exchanger('evaporator')
su = cmp.heat_exchanger('superheater')
pu = cmp.pump('pump evaporator')
# compressor-system
cp1 = cmp.compressor('compressor 1')
cp2 = cmp.compressor('compressor 2')
he = cmp.heat_exchanger('intercooler')
# busses
x = np.array([0, 0.7, 1, 1.3])
y = 1 / np.array([0.8, 0.95, 1, 0.98]) / 0.9583794
motor = cmp_char.characteristics(x=x, y=y)
self.power = con.bus('total compressor power')
self.power.add_comps({
'c': cp1,
'char': motor
}, {
'c': cp2,
'char': motor
})
self.heat = con.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 = con.connection(c_in, 'out1', cd, 'in1')
cb_rp = con.connection(cb, 'out1', rp, 'in1')
rp_cd = con.connection(rp, 'out1', cd, 'in2')
self.cd_cons = con.connection(cd, 'out2', cons, 'in1')
cons_cf = con.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 = con.connection(cd, 'out1', va, 'in1')
self.nw.add_conns(cd_va)
# evaporator system
va_dr = con.connection(va, 'out1', dr, 'in1')
dr_pu = con.connection(dr, 'out1', pu, 'in1')
pu_ev = con.connection(pu, 'out1', ev, 'in2')
ev_dr = con.connection(ev, 'out2', dr, 'in2')
dr_su = con.connection(dr, 'out2', su, 'in2')
self.nw.add_conns(va_dr, dr_pu, pu_ev, ev_dr, dr_su)
self.amb_in_su = con.connection(amb_in, 'out1', su, 'in1')
su_ev = con.connection(su, 'out1', ev, 'in1')
ev_amb_out = con.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 = con.connection(su, 'out2', cp1, 'in1')
self.nw.add_conns(su_cp1)
# compressor-system
cp1_he = con.connection(cp1, 'out1', he, 'in1')
he_cp2 = con.connection(he, 'out1', cp2, 'in1')
cp2_c_out = con.connection(cp2, 'out1', c_out, 'in1')
ic_in_he = con.connection(ic_in, 'out1', he, 'in2')
he_ic_out = con.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
rp.set_attr(eta_s=0.8, design=['eta_s'], offdesign=['eta_s_char'])
cons.set_attr(pr=1, design=['pr'], offdesign=['zeta'])
# evaporator system
ev.set_attr(pr1=1,
pr2=.999,
ttd_l=5,
design=['ttd_l'],
offdesign=['kA'],
kA_char1='EVA_HOT',
kA_char2='EVA_COLD')
# 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])
su_char = hlp.dc_cc(x=x, y=y, param='m')
su.set_attr(kA_char1='default',
kA_char2=su_char,
offdesign=['zeta1', 'zeta2', 'kA'])
pu.set_attr(eta_s=0.8, design=['eta_s'], offdesign=['eta_s_char'])
# compressor system
cp1.set_attr(eta_s=0.8, design=['eta_s'], offdesign=['eta_s_char'])
cp2.set_attr(eta_s=0.8, design=['eta_s'], offdesign=['eta_s_char'])
# characteristic line for intercooler kA
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
])
he_char_cold = hlp.dc_cc(x=x, y=y, param='m')
he.set_attr(kA_char1='default',
kA_char2=he_char_cold,
offdesign=['zeta1', 'zeta2', 'kA'])
cd.set_attr(pr2=0.998, design=['pr2'], offdesign=['zeta2', 'kA'])
# %% connection parametrization
# condenser system
c_in_cd.set_attr(fluid={'water': 0, 'NH3': 1}, p=60)
cb_rp.set_attr(T=60, p=10, fluid={'water': 1, 'NH3': 0})
self.cd_cons.set_attr(T=105)
cons_cf.set_attr(h=con.ref(cb_rp, 1, 0), p=con.ref(cb_rp, 1, 0))
cd_va.set_attr(p=con.ref(c_in_cd, 1, -1000),
Td_bp=-5,
h0=500,
design=['Td_bp'])
# evaporator system cold side
pu_ev.set_attr(m=con.ref(va_dr, 10, 0), p0=5)
dr_su.set_attr(p0=5, T=5)
su_cp1.set_attr(p=con.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=con.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=con.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=con.ref(ic_in_he, 1, -200), design=['p'])
cp2_c_out.set_attr(p=con.ref(c_in_cd, 1, 0), h=con.ref(c_in_cd, 1, 0))
