def region_prho(p, rho):
"""
# Section 3.5 Regions as a function of p and rho
# function region_prho = region_prho(p,rho)
"""
v = 1 / rho
if (p < 0.000611657) or (p > 100):
# region_prho = 0;
logger.warning('Preasure outside valid area')
return 0
if p < 16.5292: # %Bellow region 3, Check region 1,4,2
if v < Region1.v1_pT(
p, 273.15
): # %Observe that this is not actually min of v. Not valid Water of 4???C is ligther.
# region_prho = 0;
logger.warning('Specific volume outside valid area')
return 0
if v <= Region1.v1_pT(p, Region4.T4_p(p)):
# region_prho = 1;
return 1
if v < Region2.v2_pT(p, Region4.T4_p(p)):
# region_prho = 4;
return 4
if v <= Region2.v2_pT(p, 1073.15):
# region_prho = 2;
return 2
if p > 10: # %Above region 5
# region_prho = 0;
logger.warning('Preasure outside valid area')
return 0
if v <= Region5.v5_pT(p, 2073.15):
# region_prho = 5;
return 5
else: # %Check region 1,3,4,3,2 (Above the lowest point of region 3.)
if v < Region1.v1_pT(
p, 273.15
): # %Observe that this is not actually min of v. Not valid Water of 4???C is ligther.
# region_prho = 0;
logger.warning('Specific volume outside valid area')
return 0
if v < Region1.v1_pT(p, 623.15):
# region_prho = 1;
return 1
# %Check if in region 3 or 4 (Bellow Reg 2)
if v < Region2.v2_pT(p, RegionBorders.B23T_p(p)):
# %Region 3 or 4
if p > 22.064: # %Above region 4
# region_prho = 3;
return 3
if (v < Region3.v3_ph(p, Region4.h4L_p(p))) or (v > Region3.v3_ph(
p, Region4.h4V_p(p))): # %Uses iteration!!
# region_prho = 3;
return 3
else:
# region_prho = 4;
return 4
# %Check if region 2
if v < Region2.v2_pT(p, 1073.15):
# region_prho = 2;
return 2
# region_prho = 0;
logger.warning('Preasure and Density outside valid area')
return 0
def my_AllRegions_ph(p, h):
""" function my_AllRegions_ph = my_AllRegions_ph(p, h) """
h0 = [0.5132047, 0.3205656, 0, 0, -0.7782567, 0.1885447]
h1 = [0.2151778, 0.7317883, 1.241044, 1.476783, 0, 0]
h2 = [-0.2818107, -1.070786, -1.263184, 0, 0, 0]
h3 = [0.1778064, 0.460504, 0.2340379, -0.4924179, 0, 0]
h4 = [-0.0417661, 0, 0, 0.1600435, 0, 0]
h5 = [0, -0.01578386, 0, 0, 0, 0]
h6 = [0, 0, 0, -0.003629481, 0, 0]
# % Calcualte density.
# switch region_ph(p, h)
if RegionSelection.region_ph(p, h) == 1:
Ts = Region1.T1_ph(p, h)
T = Ts
rho = 1 / Region1.v1_pT(p, Ts)
elif RegionSelection.region_ph(p, h) == 2:
Ts = Region2.T2_ph(p, h)
T = Ts
rho = 1 / Region2.v2_pT(p, Ts)
elif RegionSelection.region_ph(p, h) == 3:
rho = 1 / Region3.v3_ph(p, h)
T = Region3.T3_ph(p, h)
elif RegionSelection.region_ph(p, h) == 4:
xs = Region4.x4_ph(p, h)
if p < 16.529:
v4v = Region2.v2_pT(p, Region4.T4_p(p))
v4L = Region1.v1_pT(p, Region4.T4_p(p))
else:
v4v = Region3.v3_ph(p, Region4.h4V_p(p))
v4L = Region3.v3_ph(p, Region4.h4L_p(p))
rho = 1 / (xs * v4v + (1 - xs) * v4L)
T = Region4.T4_p(p)
elif RegionSelection.region_ph(p, h) == 5:
Ts = Region5.T5_ph(p, h)
T = Ts
rho = 1 / Region5.v5_pT(p, Ts)
else:
# my_AllRegions_ph = NaN;
logger.warning('Region switch returned unknown value')
return float("NaN")
rhos = rho / 317.763
Ts = T / 647.226
# ps = p / 22.115
# % Check valid area
if (T > (900 + 273.15)) or (T > (600 + 273.15) and
(p > 300)) or (T > (150 + 273.15) and
(p > 350)) or (p > 500):
# my_AllRegions_ph = NaN;
return float("NaN")
my0 = Ts**0.5 / (1 + 0.978197 / Ts + 0.579829 / (Ts**2) - 0.202354 /
(Ts**3))
Sum = 0
# TODO:vvvv Check for mistake vvvvv
# Original Code: for i = 0 : 5
# Same Problem as in my_AllRegions_pT, see there for explanation
for i in range(0, 6):
# Sum = Sum + h0(i + 1) * (1 / Ts - 1) ** i + h1(i + 1) * (1 / Ts - 1) ** i * (rhos - 1) ** 1 + h2(i + 1) * (1 / Ts - 1) ** i * (rhos - 1) ** 2 + h3(i + 1) * (1 / Ts - 1) ** i * (rhos - 1) ** 3 + h4(i + 1) * (1 / Ts - 1) ** i * (rhos - 1) ** 4 + h5(i + 1) * (1 / Ts - 1) ** i * (rhos - 1) ** 5 + h6(i + 1) * (1 / Ts - 1) ** i * (rhos - 1) ** 6;
Sum = Sum + h0[i] * (1 / Ts - 1) ** i + \
h1[i] * (1 / Ts - 1) ** i * (rhos - 1) ** 1 + \
h2[i] * (1 / Ts - 1) ** i * (rhos - 1) ** 2 + \
h3[i] * (1 / Ts - 1) ** i * (rhos - 1) ** 3 + \
h4[i] * (1 / Ts - 1) ** i * (rhos - 1) ** 4 + \
h5[i] * (1 / Ts - 1) ** i * (rhos - 1) ** 5 + \
h6[i] * (1 / Ts - 1) ** i * (rhos - 1) ** 6
my1 = math.exp(rhos * Sum)
mys = my0 * my1
return mys * 0.000055071