def test_flows_water_15(self):
# CENGEL P10-22
flow_a = Flow(water)
flow_a.massFF = 1
flow_a.massFR = 20
flow_a.items = [
state_01 := StatePure(P=6000), boiler := Boiler(), state_02 :=
StatePure(T=450), turbine := Turbine(eta_isentropic=0.94), state_03
:= StatePure(), condenser := Condenser(), state_04 :=
StatePure(P=50, T=water.define(StatePure(P=50, x=0)).T - 6.3), pump
:= Pump(), state_01
]
cycle = Cycle()
cycle.flows = [flow_a]
cycle.solve()
self.CompareResults(state_04, {'h': 314.03, 'mu': 0.001026}, 2)
self.CompareResults(state_01, {'h': 320.13}, 2)
self.CompareResults(state_03, {'h': 2394.4}, 2)
self.assertTrue(isWithin(cycle.Q_in, 1, '%', 59660))
self.assertTrue(isWithin(cycle.netPower, 1, '%', 18050))
self.assertTrue(isWithin(cycle.efficiency, 1, '%', 0.303))
pass
def test_flows_water_12(self):
# CENGEL P10-45
flow_a = Flow(water)
flow_a.massFF = 1
flow_a.items = [
ofwh := MixingChamber(), state_3 := StatePure(x=0), pump2 :=
Pump(), state_4 := StatePure(), boiler := Boiler(), state_5 :=
StatePure(P=6000, T=450), turbine := Turbine()
]
flow_b = Flow(water)
flow_b.items = [turbine, state_6 := StatePure(P=400), ofwh]
flow_c = Flow(water)
flow_c.items = [
turbine, state_7 := StatePure(P=20), condenser := Condenser(),
state_1 := StatePure(x=0), pump1 := Pump(), state_2 := StatePure(),
ofwh
]
cycle = Cycle()
cycle.flows = [flow_a, flow_b, flow_c]
cycle.solve()
cycle.solve()
for e in cycle._equations:
e.update()
cycle.solve()
self.assertTrue(isWithin(cycle.net_sPower, 1, '%', 1017))
self.assertTrue(isWithin(cycle.efficiency, 1, '%', 0.378))
pass
def test_flows_water_03(self):
print('CENGEL P10.57')
# h3 = h11 ? says solutions
# h4 = h9
flow_a = Flow(water)
flow_a.massFF = 1
flow_a.massFR = 75
flow_a.items = [
mixcCond := MixingChamber(), state_i := StatePure(), condenser :=
Condenser(), state_01 := StatePure(P=20, x=0), pump := Pump(),
state_02 := StatePure(P=5000), cfwhA :=
HeatExchanger(infer_common_exitT=True), state_03 := StatePure(),
cfwhB := HeatExchanger(infer_common_exitT=True), state_04 :=
StatePure(), boiler := Boiler(), state_05 := StatePure(P=5000,
T=700),
turbine := Turbine()
]
flow_b = Flow(water)
flow_b.massFF = 0.1446
flow_b.items = [
turbine, state_06 := StatePure(P=1400), cfwhB, state_09 :=
StatePure(x=0), trap := Trap(), state_10 := StatePure(), mixcI :=
MixingChamber()
]
flow_c = Flow(water)
flow_c.items = [turbine, state_07 := StatePure(P=245), mixcI]
flow_e = Flow(water)
flow_e.items = [
mixcI, state_i2 := StatePure(), cfwhA, state_11 := StatePure(x=0),
trapA := Trap(), state_12 := StatePure(), mixcCond
]
flow_d = Flow(water)
flow_d.items = [turbine, state_08 := StatePure(P=20), mixcCond]
cycle = Cycle()
cycle.flows = [flow_a, flow_b, flow_c, flow_d, flow_e]
cycle.solve()
# Todo - first 0-1-2 equations are solvable together
self.CompareResults(state_01, {'h': 251, 'mu': 0.00102}, 3)
self.CompareResults(state_02, {'h': 256.1}, 3)
self.CompareResults(state_03, {'h': 533}, 3)
self.CompareResults(state_11, {'h': state_03.h}, 3)
self.CompareResults(state_04, {'h': 830}, 3)
self.assertTrue(isWithin(flow_c.massFF, 3, '%', 0.09810))
self.assertTrue(isWithin(cycle.netPower, 3, '%', 93000))
self.assertTrue(isWithin(cycle.netPower / cycle.Q_in, 3, '%', 0.404))
pass
def test_flows_water_14(self):
# CENGEL P10-47
flow_a = Flow(water)
flow_a.massFF = 1
flow_a.massFR = 16
flow_a.items = [
ofwh2 := MixingChamber(), state_05 := StatePure(x=0), pump3 :=
Pump(), state_06 := StatePure(), boiler := Boiler(), state_07 :=
StatePure(P=8000, T=550), turbine := Turbine()
]
flow_b = Flow(water)
flow_b.items = [turbine, state_08 := StatePure(P=600), ofwh2]
flow_c = Flow(water)
flow_c.items = [
turbine, state_09 := StatePure(P=200), ofwh1 := MixingChamber()
]
flow_d = Flow(water)
flow_d.items = [
turbine, state_10 := StatePure(P=10), condenser := Condenser(),
state_01 := StatePure(x=0), pump1 := Pump(), state_02 :=
StatePure(), ofwh1
]
flow_e = Flow(water)
flow_e.items = [
ofwh1, state_03 := StatePure(x=0), pump2 := Pump(), state_04 :=
StatePure(), ofwh2
]
cycle = Cycle()
cycle.flows = [flow_a, flow_b, flow_c, flow_d, flow_e]
cycle.solve()
for e in cycle._equations:
e.update()
cycle.solve()
for e in cycle._equations:
e.update()
cycle.solve()
self.CompareResults(state_02, {'h': 192}, 2)
self.CompareResults(state_04, {'h': 505.13}, 2)
self.CompareResults(state_06, {'h': 678.52}, 2)
self.CompareResults(flow_b, {'massFF': 0.07171}, 2)
self.CompareResults(flow_c, {'massFF': 0.1201}, 2)
self.assertTrue(isWithin(cycle.netPower, 1, '%', 19800))
self.assertTrue(isWithin(cycle.efficiency, 1, '%', 0.435))
pass
def test_flows_water_06(self):
# CENGEL P10-48
# diagram in book is not helpful - see solutions
flow_a = Flow(water)
flow_a.massFF = 1
flow_a.items = [
mixc := MixingChamber(), state_t := StatePure(), condenser :=
Condenser(), state_1 := StatePure(x=0), pump := Pump(), state_2 :=
StatePure(), cfwh := HeatExchanger(), state_3 :=
StatePure(T=water.define(StatePure(P=1000, x=0)).T), boiler :=
Boiler(), state_4 := StatePure(P=3000,
T=350), turbine := Turbine()
]
flow_b = Flow(water)
flow_b.items = [
turbine, state_5 := StatePure(P=1000), cfwh, state_7 :=
StatePure(x=0), trap := Trap(), state_8 := StatePure(P=20), mixc
]
flow_c = Flow(water)
flow_c.items = [turbine, state_6 := StatePure(), mixc]
cycle = Cycle()
cycle.flows = [flow_a, flow_b, flow_c]
cycle.solve()
for e in cycle._equations:
e.update()
cycle.solve()
for e in cycle._equations:
e.update()
cycle.solve()
for f in cycle.flows: # TODO - Has to solve the flows manually again
f.solve()
for e in cycle._equations:
e.update()
cycle.solve()
self.CompareResults(state_2, {'h': 254.45}, 2)
self.CompareResults(state_4, {'h': 3116.1, 's': 6.7450}, 2)
self.CompareResults(state_5, {'h': 2851.9}, 2)
self.CompareResults(state_6, {'h': 2221.7, 'x': 0.8357}, 2)
self.CompareResults(state_7, {'h': 762.51, 'T': 179.9}, 2)
self.CompareResults(flow_b, {'massFF': 0.2437}, 2)
self.assertTrue(isWithin(cycle.sHeat, 2, '%', 2353))
self.assertTrue(isWithin(cycle.net_sPower, 2, '%', 737.8))
self.assertTrue(isWithin(cycle.efficiency, 1, '%', 0.3136))
pass
def test_flows_water_05(self):
# CENGEL P10-53
flow_a = Flow(workingFluid=water)
flow_a.massFF = 1
flow_a.items = [
ofwh := MixingChamber(), state_03 := StatePure(x=0), pump2 :=
Pump(), state_04 := StatePure(), cfwh := HeatExchanger(), state_05
:= StatePure(T=water.define(StatePure(x=0, P=1200)).T), boiler :=
Boiler(), state_08 := StatePure(P=10000,
T=600), turbine := Turbine()
]
flow_b = Flow(water)
flow_b.items = [
turbine, state_09 := StatePure(P=1200), cfwh, state_06 :=
StatePure(x=0), trap := Trap(), state_07 := StatePure(), ofwh
]
flow_c = Flow(water)
flow_c.items = [turbine, state_10 := StatePure(P=600), ofwh]
flow_d = Flow(water)
flow_d.items = [
turbine, state_11 := StatePure(P=10), condenser := Condenser(),
state_01 := StatePure(x=0), pump1 := Pump(), state_02 :=
StatePure(), ofwh
]
cycle = Cycle()
cycle.flows = [flow_a, flow_b, flow_c, flow_d]
cycle.netPower = 400000
cycle.solve()
for e in cycle._equations:
e.update()
cycle.solve()
for e in cycle._equations:
e.update()
cycle.solve()
self.assertTrue(isWithin(cycle.netPower / cycle.Q_in, 1, '%', 0.452))
self.assertTrue(isWithin(cycle._get_mainFlow().massFR, 1, '%', 313))
self.assertTrue(isWithin(flow_b.massFF, 4, '%', 0.05404))
self.assertTrue(isWithin(flow_c.massFF, 4, '%', 0.1694))
pass
def test_flows_refr_01(self):
# CENGEL P11-13
flow_a = Flow(R134a)
flow_a.massFF = 1
flow_a.items = [
state_1 := StatePure(x=1), compressor := Compressor(), state_2 :=
StatePure(P=800), condenser := Condenser(), state_3 :=
StatePure(x=0), expValve := Trap(), state_4 := StatePure(T=-12),
evaporator := Boiler(), state_1
]
cycle = Cycle()
cycle.flows = [flow_a]
cycle.solve()
pass
def test_flows_water_13(self):
# CENGEL P10-46
flow_a = Flow(water)
flow_a.massFF = 1
flow_a.items = [
mixc := MixingChamber(), state_4 := StatePure(), boiler :=
Boiler(), state_5 := StatePure(P=6000,
T=450), turbine := Turbine()
]
flow_b = Flow(water)
flow_b.items = [
turbine, state_6 := StatePure(P=400), cfwh := HeatExchanger(),
state_3 := StatePure(x=0), pump2 := Pump(), state_9 := StatePure(),
mixc
]
flow_c = Flow(water)
flow_c.items = [
turbine, state_7 := StatePure(), condenser := Condenser(), state_1
:= StatePure(x=0, P=20), pump1 := Pump(), state_2 := StatePure(),
cfwh, state_8 := StatePure(), mixc
]
# assuming h8 = h9 = h4 - 8 & 9 have same pressure. determine 8's h by vdp (determine out of nowhere)
cycle = Cycle()
cycle.flows = [flow_a, flow_b, flow_c]
cycle.solve()
wtot = 0
for f in cycle.flows:
wtot += f.massFF * f.get_net_sWorkExtracted()
qtot = 0
for f in cycle.flows:
qtot += f.massFF * f.get_sHeatSupplied()
self.assertTrue(isWithin(wtot, 1, '%', 1016.8))
self.assertTrue(isWithin(wtot / qtot, 1, '%', 0.378))
pass
def test_flows_water_04(self):
# MECH 2201 - A9 Q3
water = Fluid(mpDF=water_mpDF)
flow_a = Flow(water)
flow_a.massFF = 1
flow_a.items = [
mixCh := MixingChamber(), state_12 := StatePure(), boiler :=
Boiler(), state_01 := StatePure(P=12000, T=520), turbine :=
Turbine(eta_isentropic=1)
]
flow_b = Flow(water)
flow_b.items = [
turbine, state_02 := StatePure(P=1000), cfwh := HeatExchanger(),
state_10 := StatePure(x=0), pump1 := Pump(), state_11 :=
StatePure(P=12000), mixCh
]
flow_c = Flow(water)
flow_c.items = [
turbine, state_03 := StatePure(P=150), ofwh := OpenFWHeater()
]
flow_d = Flow(water)
flow_d.items = [
turbine, state_04 := StatePure(P=6), condenser := Condenser(),
state_05 := StatePure(x=0), pump2 := Pump(), state_06 :=
StatePure(P=150), ofwh
]
flow_e = Flow(water)
flow_e.items = [
ofwh, state_07 := StatePure(P=150, x=0), pump3 := Pump(), state_08
:= StatePure(P=12000), cfwh, state_09 := StatePure(T=170), mixCh
]
cycle = Cycle()
cycle.flows = [flow_a, flow_b, flow_c, flow_d, flow_e]
cycle.netPower = 320000
cycle.solve()
for e in cycle._equations:
e.update()
cycle.solve()
for e in cycle._equations:
e.update()
cycle.solve()
self.CompareResults(state_01, {'h': 3401.8, 's': 6.5555}, 3)
self.CompareResults(state_02, {'h': 2764.2, 'x': 0.9931}, 3)
self.CompareResults(state_03, {'h': 2436.9, 's': state_01.s}, 3)
self.CompareResults(state_04, {'h': 2018.3, 'x': 0.7727}, 3)
self.CompareResults(state_05, {'h': 151.53}, 3)
self.CompareResults(state_06, {'h': 151.67}, 3)
self.CompareResults(state_07, {'h': 467.11}, 3)
self.CompareResults(state_08, {'h': 479.59}, 3)
self.CompareResults(state_09, {'h': 725.86}, 3)
self.CompareResults(state_10, {'h': 762.81}, 3)
self.CompareResults(state_11, {'h': 775.21}, 3)
self.CompareResults(flow_b, {'massFF': 0.1096}, 3)
self.CompareResults(state_12, {'h': 731.27}, 3)
self.CompareResults(flow_c, {'massFF': 0.1229}, 3)
self.assertTrue(
isWithin(
state_01.h - state_02.h + (1 - flow_b.massFF) *
(state_02.h - state_03.h) +
(1 - flow_b.massFF - flow_c.massFF) *
(state_03.h - state_04.h), 3, '%', 1250.3))
efficiency = cycle.netPower / cycle.Q_in
self.assertTrue(isWithin(efficiency, 3, '%', 0.463))
self.assertTrue(isWithin(3600 * flow_a.massFR, 3, '%', 9.31 * 10**5))