PYTHON CODE

(PLEASE MAKE IT SIMPLE AND WITH FULL COMMENTS AT EACH STEP)

Define a Python Class named Steam. The attributes and methods are defined below. The behavior of this class will be demonstrated with an example main program that uses the class. The class named Steam has 8 attributes, an three methods: __init__, calc, and print, as defined below:

import numpy as np from scipy.interpolate import griddata

class Steam: def __init__(self, pressure, T=None, h=None, s=None, x=None, v=None, name=None): self.p = pressure # pressure - kPa self.T = T # Temperature - degrees C self.x = x # quality (a value between 0 and 1) self.v = v # specific volume - m^3/kg self.h = h # enthalpy - kJ/kg self.s = s # entropy - kJ/(kg K) self.name = name # a useful identifier self.region = None # 'superheated' or 'saturated' if T==None and x==None and v==None and h==None and s==None: return self.calc() def calc(self): # calculate the missing steam properties using griddata() and the steam tables given earlier.

IMPORTANT:

a)look carefully at the PRESSURE units in the two tables. They are DIFFERENT.

b) Beware of the GAP IN THE DATA problem!

def print(self): # print the available (not None) Steam values

Note: calc(self) should raise errors if asked to do things in cannot handle such as:

raise ValueError('Error - this function cannot operate in the sub-cooled region') raise ValueError('Not enough properties specified')

def main():

inlet=Steam(7350, name='Turbine Inlet')

inlet.x =0.9 # 90 percent quality - accessed

inlet.calc() inlet.print() h1 = inlet.h; s1 = inlet.s

print(h1,s1,' ')

outlet=Steam(100, s=inlet.s, name='Turbine Exit')

#notice - s=inlet.s

outlet.print()

another=Steam(8575, h=2050, name='State 3')

another.print()

yetanother=Steam(8900, h=41250, name='State 4')

yetanother.print()

#uncommenting the next two lines will cause a ValueError error

#final1 = Steam(7000, T=250, name='State 5')

#final1.print()

if __name__ == "__main__":

main()