def read_devicefile(filename):
devFile = open(filename, 'r')
discardHeader = devFile.readline()
Comps = {}
i = 0
begId = 2
for line in devFile:
dev = line.split(',')
if dev[1] == "TURBINE":
Comps[dev[0]] = turbine.Turbine(dev[0], int(dev[begId]),
int(dev[begId + 1]))
elif dev[1] == "BOILER":
Comps[dev[0]] = boiler.Boiler(dev[0], int(dev[begId]),
int(dev[begId + 1]))
elif dev[1] == "CONDENSER":
Comps[dev[0]] = condenser.Condenser(dev[0], int(dev[begId]),
int(dev[begId + 1]))
elif dev[1] == "PUMP":
Comps[dev[0]] = pump.Pump(dev[0], int(dev[begId]),
int(dev[begId + 1]))
i = i + 1
DevNum = i
return Comps, DevNum
def read_jsonfile(filename):
""" rankine cycle in json file"""
# 1 read json file to dict
with open(filename, 'r') as f:
rkcyc = json.loads(f.read())
# print(rkcyc)
name = rkcyc["name"]
dictnodes = rkcyc["nodes"]
dictcomps = rkcyc["comps"]
# 2 convert dict nodes to the object nodes
countNodes = len(dictnodes)
nodes = [None for i in range(countNodes)]
for curjnode in dictnodes:
i = int(curjnode['id'])
nodes[i] = node.Node(curjnode['name'], i)
nodes[i].p = curjnode['p']
nodes[i].t = curjnode['t']
nodes[i].x = curjnode['x']
if nodes[i].p != None and nodes[i].t != None:
nodes[i].pt()
elif nodes[i].p != None and nodes[i].x != None:
nodes[i].px()
elif nodes[i].t != None and nodes[i].x != None:
nodes[i].tx()
#print(nodes[1])
# 3 convert dict Comps to the object Comps
DevNum = len(dictcomps)
Comps = {}
for curdev in dictcomps:
if curdev['type'] == "TURBINE":
Comps[curdev['name']] = turbine.Turbine(curdev['name'],
curdev['inNode'],
curdev['exNode'])
elif curdev['type'] == "BOILER":
Comps[curdev['name']] = boiler.Boiler(curdev['name'],
curdev['inNode'],
curdev['exNode'])
elif curdev['type'] == "CONDENSER":
Comps[curdev['name']] = condenser.Condenser(
curdev['name'], curdev['inNode'], curdev['exNode'])
elif curdev['type'] == "PUMP":
Comps[curdev['name']] = pump.Pump(curdev['name'], curdev['inNode'],
curdev['exNode'])
return name, nodes, countNodes, Comps, DevNum
def RankineCycle():
condenserOverCool = 0.1
condenserPressure = 0.006
desiredQuality = 0.9
table = []
for boilerPressure in [1, 1.5, 2]:
nodes = []
for i in range(4):
nodes.append(Node.Node())
nodes[0].p = boilerPressure
nodes[1].p = condenserPressure
nodes[1].x = desiredQuality
nodes[2].p = condenserPressure
nodes[2].x = 0
nodes[3].p = boilerPressure
# simulate
nodes[1].px()
t = turbine.Turbine(nodes[0], nodes[1])
t.simulate()
nodes[0] = t.inletNode
nodes[2].px()
c = condenser.Condenser(nodes[1], nodes[2])
c.simulate(condenserOverCool)
nodes[2] = c.exitNode
p = pump.Pump(nodes[2], nodes[3])
p.simulate()
nodes[3] = p.exitNode
b = boiler.Boiler(nodes[3], nodes[0])
b.simulate()
efficiency = (t.workExtracted - p.workRequired) / (b.heatAdded)
table.append([boilerPressure, efficiency])
print(tabulate(table, headers=["Boiler Pressure", "Efficiency"]))
def main():
condenserOverCool = 0.1
condenserPressure = 0.006
desiredQuality = 0.9
table = []
for boilerPressure in [1, 1.5, 2]:
turbineEntropy = iapws.IAPWS97(P=condenserPressure, x=desiredQuality).s
turbineInletTemperature = iapws.IAPWS97(P=boilerPressure,
s=turbineEntropy).T
condenserExitState = iapws.IAPWS97(x=0, P=condenserPressure)
condenserExitState = iapws.IAPWS97(h=condenserExitState.h -
condenserOverCool,
P=condenserPressure)
p = pump.Pump(condenserExitState)
p.simulate(boilerPressure)
b = boiler.Boiler(p.exitState)
b.simulate(turbineInletTemperature)
boilerSaturationTemp = iapws.IAPWS97(P=boilerPressure, x=0.5).T
degreeOfSuperheat = turbineInletTemperature - boilerSaturationTemp
t = turbine.Turbine(b.exitState)
t.simulate(condenserPressure)
c = condenser.Condenser(t.exitState)
c.simulate(condenserExitState.T)
efficiency = (t.workExtracted - p.workRequired) / (b.heatAdded)
table.append([boilerPressure, degreeOfSuperheat, efficiency])
print tabulate(
table,
headers=["Boiler Pressure", "Degree of Superheat", "Efficiency"])
def RankineCycle():
boilerPressure = 8.0
condenserPressure = 0.008
Wcycledot = 100.00
# 1 init nodes
nodes = []
for i in range(4):
nodes.append(node.Node())
nodes[0].p = boilerPressure
nodes[0].x = 1
nodes[1].p = condenserPressure
nodes[2].p = condenserPressure
nodes[2].x = 0
nodes[3].p = boilerPressure
nodes[0].px()
nodes[2].px()
# 2 connect device
t = turbine.Turbine(0, 1)
p = pump.Pump(2, 3)
b = boiler.Boiler(3, 0)
# 3 simulate
t.simulate(nodes)
p.simulate(nodes)
bwr = p.workRequired / t.workExtracted
mdot = Wcycledot * 1000.0* 3600.0 / (t.workExtracted - p.workRequired)
b.simulate(nodes, mdot) # in MW
efficiency = (t.workExtracted - p.workRequired) / \
(b.heatAdded) # in MW
# 4 condenser
nodew = []
for i in range(2):
nodew.append(node.Node())
nodew[0].t = 15
nodew[0].x = 0
nodew[1].t = 35
nodew[1].x = 0
nodew[0].tx()
nodew[1].tx()
c = condenser.Condenser(1, 2, 0, 1)
c.simulate(nodes, nodew, mdot)
print("Boiler Pressure: ", boilerPressure, "MPa")
print("Condenser Pressure: ", condenserPressure, "MPa")
print("The net power output of the cycle: ", Wcycledot, "MW")
print("Cooling water enters the condenser T", nodew[0].t, "°C")
print("Cooling water exits the condenser T", nodew[1].t, "°C")
print(" \n --------------------------------------------------")
print("Efficiency: ", '%.2f' % (efficiency * 100), "%")
print("The back work ratio: ", '%.2f' % (bwr * 100), "%")
print("The mass flow rate: ", '%.2f' % mdot, "%")
print('The rate of heat transfer as the fluid passes the boiler: ',
'%.2f' % b.Qindot, 'MW')
print('The rate of heat transfer from the condensing steam: ',
'%.2f' % c.Qoutdot, 'MW')
print('The mass flow rate of the condenser cooling water: ', '%.2f' %
c.mcwdot, 'kg/h')