def __init__(self,
t0=0.0*units.seconds,
tf=1.0*units.seconds,
dt=1.0*units.seconds):
self.t0 = validation.validate_ge("t0", t0, 0.0*units.seconds)
self.tf = validation.validate_ge("tf", tf, t0)
self.dt = validation.validate_ge("dt", dt, 0.0*units.seconds)
self.series = units.Quantity(np.linspace(start=t0.magnitude,
stop=tf.magnitude,
num=self.timesteps()),
'seconds')
self.ts = 0
def __init__(self,
name=None,
mat=Material(),
vol=0 * units.meter**3,
T0=0 * units.kelvin,
alpha_temp=0 * units.delta_k / units.kelvin,
timer=Timer(),
heatgen=False,
power_tot=0 * units.watt):
"""Initalizes a thermal hydraulic component.
A thermal-hydraulic component will be treated as one "lump" in the
lumped capacitance model.
:param name: The name of the component (i.e., "fuel" or "cool")
:type name: str.
:param vol: The volume of the component
:type vol: float meter**3
:param T0: The initial temperature of the component
:type T0: float.
:param alpha_temp: temperature coefficient of reactivity
:type alpha_temp: float
:param timer: The timer instance for the sim
:type timer: Timer object
:param heatgen: is this component a heat generator (fuel)
:type heatgen: bool
"""
self.name = name
self.vol = vol.to('meter**3')
validation.validate_ge("vol", vol, 0 * units.meter**3)
self.k = mat.k
self.cp = mat.cp
self.dm = mat.dm
self.T0 = T0.to('kelvin')
validation.validate_num("T", T0)
self.T = units.Quantity(
np.zeros(shape=(timer.timesteps(), ), dtype=float), 'kelvin')
self.T[0] = T0
self.alpha_temp = alpha_temp.to('delta_k/kelvin')
self.timer = timer
self.heatgen = heatgen
self.power_tot = power_tot
self.cond = {}
self.conv = {}
self.mass = {}
self.cust = {}
self.prev_t_idx = 0
def f_th(t, y_th, si):
"""Returns the thermal hydraulics solution at time t
:param t: the time [s] at which the update is occuring.
:type t: float.
:param y: TODO
:type y: np.ndarray
"""
t_idx = si.timer.t_idx(t * units.seconds)
f = units.Quantity(np.zeros(shape=(si.n_components(), ), dtype=float),
'kelvin / second')
power = si.y[t_idx][0]
o_i = 1 + si.n_pg
o_f = 1 + si.n_pg + si.n_dg
omegas = si.y[t_idx][o_i:o_f]
for idx, comp in enumerate(si.components):
f[idx] = si.th.dtempdt(component=comp,
power=power,
omegas=omegas,
t_idx=t_idx)
return f
############################################# # # User Workspace # ############################################# # Thermal hydraulic params # Temperature feedbacks of reactivity (ragusa_consistent_2009) # Doppler # actually this coeff is to per C^d... crap. alpha_f = (-0.8841 * units.pcm / units.kelvin) # Coolant alpha_c = (0.1263 * units.pcm / units.kelvin) # below from ragusa_consistent_2009 t_fuel = units.Quantity(525.0, units.degC).to(units.kelvin) t_clad = units.Quantity(525.0, units.degC).to(units.kelvin) t_cool = units.Quantity(440.0, units.degC).to(units.kelvin) t_inlet = units.Quantity(355.0, units.degC).to(units.kelvin) # [m] ... matrix(4mm) + coating(1mm) kappa = 0.00 # TODO if you fix omegas, kappa ~ 0.06 # Initial time t0 = 0.00 * units.seconds # Timestep dt = 0.005 * units.seconds # Final Time tf = 10.0 * units.seconds
alpha_c = -1.8 * units.pcm / units.kelvin alpha_m = -0.7 * units.pcm / units.kelvin alpha_r = 1.8 * units.pcm / units.kelvin # below from steady state analysis t_fuel = 955.58086 * units.kelvin t_cool = 936.57636 * units.kelvin t_refl = 923.18521 * units.kelvin t_mod = 937.39862 * units.kelvin t_graph_peb = 936.40806 * units.kelvin t_core = 970.54064 * units.kelvin # the data below comes from design doc rev c # self._vol_flow_rate = 976.0*0.3 # kg/s TODO 0.3 is nat circ guess vel_cool = 2. * units.meter / units.second # m/s t_inlet = units.Quantity(600.0, units.degC) # degrees C # [m] ... matrix(4mm) + coating(1mm) thickness_fuel_matrix = 0.005 * units.meter kappa = 0.00 # TODO if you fix omegas, kappa ~ 0.06 core_height = 3.5 * units.meter # [m] (TODO currently approximate) core_inner_radius = 0.35 * units.meter # m core_outer_radius = 1.25 * units.meter # # Initial time t0 = 0.00 * units.seconds # Timestep dt = 0.005 * units.seconds # Final Time tf = 5.0 * units.seconds
# Timing: t0=initial, dt=step, tf=final t0 = 0.00*units.seconds dt = 0.005*units.seconds tf = 5.0*units.seconds # Temperature feedbacks of reactivity (Ragusa2009) # Fuel: Note Doppler model not implemented alpha_f = (-0.8841*units.pcm/units.kelvin) # Coolant alpha_c = (0.1263*units.pcm/units.kelvin) # Initial Temperatures t_fuel = 737.033*units.kelvin t_cool = 721.105*units.kelvin t_inlet = units.Quantity(400.0, units.degC) t_inlet.ito(units.kelvin) # Neglect decay heating kappa = 0.00 # Geometry # fuel pin radius r_fuel = 0.00348*units.meter # active core height h_core = 0.8*units.meter # surface area of fuel pin a_fuel = 2*math.pi*r_fuel*h_core # volume of a fuel pin vol_fuel = math.pi*pow(r_fuel, 2)*h_core # hydraulic area per fuel pin