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145 | # Applied Python PRISM
# (PRISM) PaRametrIc System Model
#
# Written by Charlie Taylor <cet@appliedpython.com>
# Oct,21 2005
from prism.MassItem import MassItem
from prism.Summary import Summary
import sys
from prism.props import Inc_liquid
from math import *
from prism.fortran import orifice
class ValveFixedDesign( MassItem ):
def __str__(self):
return self.refName
def __init__(self, name="liquid valve", liqObj=None, matlName="Stainless Steel, Teflon",
wdot=0.1, refWaterWdot=0.214, refWaterDP=30.0, refName="MOOG Spacebus valve", Number=1,
mass_lbm=0.9, cxw=1.0):
MassItem.__init__(self, name, type="inert", mass_lbm=mass_lbm)
self.liqObj = liqObj
#if (liqObj is not Inc_liquid.Inc_liquid):
# print "ERROR...",name,"must have Inc_liquid object input for liqObj"
# sys.exit(1)
self.Number = Number
self.matlName = matlName
self.wdot = wdot
#self.deltaP = deltaP
self.refWaterWdot = refWaterWdot
self.refWaterDP = refWaterDP
self.refName = refName
self.cxw = cxw
self.mass_lbmInp = mass_lbm
self.reCalc()
def reCalc(self, autoCalc=1):
self.autoCalc = autoCalc
self.Q = self.wdot / self.liqObj.D # cuft/s
self.Kw = sqrt( self.refWaterWdot**2 / self.refWaterDP)
self.deltaP = self.wdot**2 * 62.4/ self.liqObj.D/ self.Kw**2
self.mass_lbm = self.mass_lbmInp * self.cxw * self.Number
# estimate CdA
self.velFluid = sqrt( 24.0 * 32.174 * self.deltaP / self.liqObj.rho ) # in/sec
self.CdA = self.wdot/(self.liqObj.rho * self.velFluid) # sqin
def minGaugeStr(self, t):
if t<= self.tming:
return 'Min Gauge'
else:
return ''
def buildSummary(self):
name = self.name
if self.Number>1:
name += ' (%i)'%self.Number
summ = Summary( summName='Liquid Valve',
componentName=name, mass_lbm=self.mass_lbm, type=self.type)
summ.addAssumption( 'fluid : ' + self.liqObj.symbol )
summ.addAssumption( 'Structural Material : ' + self.matlName )
summ.addAssumption( 'valve: '+self.refName )
if self.Number>1:
summ.addAssumption( 'Mass is for %i valves total'%self.Number )
# add inputs
summ.addInput('wdot', self.wdot, 'lbm/sec', '%g')
summ.addInput('cxw', self.cxw, '', '%g')
summ.addInput('refWaterWdot', self.refWaterWdot, 'lbm/sec', '%g')
summ.addInput('refWaterDP', self.refWaterDP, 'psid', '%g')
summ.addInput('# Valves', self.Number, '', '%i')
# add outputs
summ.addOutput( 'deltaP', self.deltaP, 'psid', '%.2f' )
summ.addOutput( 'Kw', self.Kw, 'in-lb^.5/sec', '%g' )
summ.addOutput( 'velFluid', self.velFluid/12.0, 'ft/sec', '%g' )
summ.addOutput( 'CdA', self.CdA, 'sqin', '%g' )
summ.addOutput( 'fluid rho', self.liqObj.rho, 'lbm/cuin', '%g' )
summ.addOutput( 'fluid D', self.liqObj.D, 'lbm/cuft', '%g' )
summ.addOutput( 'fluid visc', self.liqObj.Visc, '1.0E5 * lb/ft-sec', '%g' )
if self.Number>1:
summ.addOutput( 'wt/Valve', self.mass_lbm/self.Number, 'lbm', '%.3f' )
return summ
if __name__ == "__main__": #self test
Fl = Inc_liquid.Inc_liquid( symbol="N2H4",T=530.0,P=243.0, mass_lbm=10.0)
h = ValveFixedDesign(name="liquid valve", liqObj=Fl, matlName="Stainless Steel, Teflon",
wdot=0.1, refWaterWdot=0.214, refWaterDP=30.0, refName="MOOG Spacebus valve, Model 53-203", Number=1,
mass_lbm=0.9, cxw=1.0)
print h.getMassStr()
print
print h.getSummary()
print
h = ValveFixedDesign(name="latch valve", liqObj=Fl, matlName="CRES, Vespel",
wdot=6.0, refWaterWdot=8.5, refWaterDP=2.0, refName="MOOG PMA Latch valve Model 51-212", Number=1,
mass_lbm=0.3, cxw=1.0)
print h.getMassStr()
print
print h.getSummary()
print
h = ValveFixedDesign(name="torque motor valve", liqObj=Fl, matlName="Stainless Steel, Teflon",
wdot=0.02, refWaterWdot=0.08, refWaterDP=3.0, refName="MOOG Artemis Latch valve Model 52-220", Number=1,
mass_lbm=1.54, cxw=1.0)
print h.getMassStr()
print
print h.getSummary()
print
h = ValveFixedDesign(name="torque motor valve", liqObj=Fl, matlName="Stainless Steel, Teflon",
wdot=.2, refWaterWdot=0.3, refWaterDP=9.0, refName="MOOG Latch valve Model 52-266", Number=1,
mass_lbm=1.54, cxw=1.0)
print h.getMassStr()
print
print h.getSummary()
|