58 lines
1.5 KiB
Python
58 lines
1.5 KiB
Python
# src/cryo_tank/config.py
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"""
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Configuration for the cryogenic LN2 tank simulation.
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Pure data module -- no functions, no side effects.
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"""
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import math
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# ---------- Tank geometry ----------
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V_TOTAL = 420.1e-3 # m^3 (420.1 L)
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H_TANK = 0.5 # m (cylinder height)
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A_CROSS = V_TOTAL / H_TANK # m^2 (cross-section area)
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D_TANK = math.sqrt(4 * A_CROSS / math.pi) # m (diameter)
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A_SIDE = math.pi * D_TANK * H_TANK # m^2 (side wall)
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A_CAP = A_CROSS # m^2 (top or bottom cap)
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A_TOTAL = A_SIDE + 2 * A_CAP # m^2 (total surface)
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# ---------- Tank limits ----------
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P_WORKING = 0.17e6 # Pa (working pressure, absolute)
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P_MAX = 0.8e6 # Pa (max bearing pressure)
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# ---------- Initial conditions ----------
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T_INIT = 78.0 # K
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ULLAGE_FRACTION = 0.30 # gas pocket = 30% of V_TOTAL
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# ---------- Inlet / outlet ----------
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MDOT_IN_LN2 = 1.144 # kg/s
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T_IN_LN2 = 77.0 # K
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MDOT_OUT_LN2 = 1.1895 # kg/s
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T_IN_HE = 100.0 # K
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# ---------- Heat transfer ----------
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H_CONV_SURFACE = 0.0 # W/(m^2*K) liquid-to-ullage surface convection
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T_ENV = 300.0 # K ambient temperature
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# ---------- Simulation control ----------
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T_END = 3600.0 # s (1 hour)
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RTOL = 1e-8
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ATOL = 1e-10
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# ---------- Output ----------
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OUTPUT_DIR = "results/cryo_tank"
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# ---------- Validation ----------
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assert V_TOTAL > 0
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assert H_TANK > 0
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assert 0 < ULLAGE_FRACTION < 1
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assert P_WORKING > 0
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assert P_MAX > P_WORKING
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assert T_INIT > 0
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assert MDOT_IN_LN2 >= 0
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assert MDOT_OUT_LN2 >= 0
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assert T_IN_LN2 > 0
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assert T_IN_HE > 0
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assert H_CONV_SURFACE >= 0
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assert T_ENV > 0
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assert T_END > 0
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