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src/cryo_tank/config.py

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+# src/cryo_tank/config.py
+"""
+Configuration for the cryogenic LN2 tank simulation.
+Pure data module -- no functions, no side effects.
+"""
+import math
+
+# ---------- Gas constants ----------
+R_UNIVERSAL = 8314.46       # J/(kmol*K)
+M_N2 = 28.014              # kg/kmol
+M_HE = 4.0026              # kg/kmol
+R_HE = R_UNIVERSAL / M_HE  # 2077.1 J/(kg*K)
+R_N2 = R_UNIVERSAL / M_N2  # 296.8 J/(kg*K)
+
+# ---------- Tank geometry ----------
+V_TOTAL = 420.1e-3          # m^3  (420.1 L)
+H_TANK = 0.5                # m    (cylinder height)
+A_CROSS = V_TOTAL / H_TANK  # m^2  (cross-section area)
+D_TANK = math.sqrt(4 * A_CROSS / math.pi)  # m (diameter)
+A_SIDE = math.pi * D_TANK * H_TANK         # m^2 (side wall)
+A_CAP = A_CROSS                             # m^2 (top or bottom cap)
+A_TOTAL = A_SIDE + 2 * A_CAP               # m^2 (total surface)
+
+# ---------- Tank limits ----------
+P_WORKING = 0.17e6          # Pa  (working pressure, absolute)
+P_MAX = 0.8e6               # Pa  (max bearing pressure)
+
+# ---------- Initial conditions ----------
+T_INIT = 78.0               # K
+ULLAGE_FRACTION = 0.30      # gas pocket = 30% of V_TOTAL
+
+# ---------- Inlet / outlet ----------
+MDOT_IN_LN2 = 1.144         # kg/s
+T_IN_LN2 = 77.0             # K
+MDOT_OUT_LN2 = 1.1895       # kg/s
+T_IN_HE = 100.0             # K
+
+# ---------- Heat transfer ----------
+H_CONV_SURFACE = 50.0       # W/(m^2*K)  liquid-to-ullage surface convection
+T_ENV = 300.0                # K  ambient temperature
+
+# ---------- Simulation control ----------
+T_END = 3600.0               # s  (1 hour)
+RTOL = 1e-8
+ATOL = 1e-10
+
+# ---------- Output ----------
+OUTPUT_DIR = "results/cryo_tank"
+
+# ---------- Validation ----------
+assert V_TOTAL > 0
+assert H_TANK > 0
+assert 0 < ULLAGE_FRACTION < 1
+assert P_WORKING > 0
+assert P_MAX > P_WORKING
+assert T_INIT > 0
+assert MDOT_IN_LN2 >= 0
+assert MDOT_OUT_LN2 >= 0
+assert T_IN_LN2 > 0
+assert T_IN_HE > 0
+assert H_CONV_SURFACE >= 0
+assert T_ENV > 0
+assert T_END > 0