# these are the pressures we're interested in here
pp = [freesteam.psat_T(50 + 273.15), 3e6, 12e6, 165e5, 300e5]
print("low p =", pp[0])
hh = arange(50., 4500., 100) * 1e3
hh1 = arange(50., 4500., 20) * 1e3
x = []
y = []
u = []
v = []
for p in pp:
plot(hh1 / 1e3, [freesteam.steam_ph(p, h).T for h in hh1], alpha=0.8)
if 0:
for h in hh:
try:
S = freesteam.steam_ph(p, h)
x += [S.h / 1.e3]
y += [S.T]
dy = freesteam.freesteam_deriv(S, 'T', 'h', 'p')
dx = 0.0005
m = math.sqrt(dx**2 + dy**2)
u += [dx / m]
v += [dy / m]
except:
pass
plot([0, 4500], [550 + 273.15, 550 + 273.15], 'b--')
# these are the pressures we're interested in here pp = [freesteam.psat_T(50+273.15), 3e6, 12e6, 165e5, 300e5] print "low p =",pp[0] hh = arange(50.,4500.,100)*1e3 hh1 = arange(50.,4500.,20)*1e3 x = [] y = [] u = [] v = [] for p in pp: plot(hh1/1e3,[freesteam.steam_ph(p,h).T for h in hh1],alpha=0.8) if 0: for h in hh: try: S = freesteam.steam_ph(p,h) x += [S.h/1.e3] y += [S.T] dy = freesteam.freesteam_deriv(S,'T','h','p') dx = 0.0005 m = math.sqrt(dx**2 + dy**2) u += [dx/m] v += [dy/m] except: pass plot([0,4500],[550+273.15,550+273.15],'b--')
for T in TT: S = freesteam.steam_pT(p,T) #print "p = %f, T = %f" % (p,T) r = S.region #print "p = %f MPa, T = %f K, region[%d,%d] = %d" % (p/1e6,T,x,y,r) im[x,y] = float(r) / 4. y += 1 x += 1 imshow(im,extent=[Tmin,Tmax,pmin/1e6,pmax/1e6],origin='lower',aspect='auto',interpolation='nearest',alpha=0.6) # LINES OF CONSTANT ENTHALPY hh = arange(100,4500,200)*1e3 for h in hh: TT2 = [freesteam.steam_ph(p,h).T for p in pp] plot(TT2,pp/1e6,'g-') plot(TT0,psat,'b-') axis([Tmin,Tmax,pmin/1e6,pmax/1e6]) #quiver(x,y,u,v,alpha=0.6) # LINES OF CONSTANT ENTROPY ss = arange(0,12,1./3)*1e3 for s in ss: TT2 = [freesteam.steam_ps(p,s).T for p in pp] plot(TT2,pp/1e6,'r:') plot(TT0,psat,'b-') axis([Tmin,Tmax,pmin/1e6,pmax/1e6])
#!/usr/bin/env python
import freesteam
S = freesteam.steam_ph(100e5, 300)
print("TESTING RESULTS")
print("region =", S.region)
print("h =", S.h)
print("v =", S.v)
print("p =", S.p)
print("s =", S.s)
print("mu=", S.mu)
print("TESTING PV")
p = 500e5
v = 1. / 401.
print("(p,v) = (%f, %f)" % (p, v))
print("bounds errors?", freesteam.bounds_pv(p, v, 1))
print("region?", freesteam.region_pv(p, v))
S = freesteam.steam_pv(p, v)
print("region =", S.region)
print("h =", S.h)
print("v =", S.v)
print("p =", S.p)
print("s =", S.s)
print("mu=", S.mu)
sys.stderr.write("can do this with 'export PATH=..:$PATH', assuming.\n")
sys.stderr.write("you are in the directory containing test.py.\n")
sys.exit(1)
else:
if not os.environ.get(LDVAR) or up not in os.environ[LDVAR]:
os.environ[LDVAR] = up
script = os.path.join(sys.path[0],"test.py")
os.execvp("python",[script] + sys.argv)
#-------------------------------------------------------------------------------
# now for the tests...
import freesteam
S = freesteam.steam_ph(100e5,300)
print "TESTING RESULTS"
print "region =",S.region
print "h =",S.h
print "v =",S.v
print "p =",S.p
print "s =",S.s
print "mu=",S.mu
print "TESTING PV"
p = 500e5
v = 1./401.
print "(p,v) = (%f, %f)" % (p, v)