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No physical validation, failure probability, universal stability or independent production-car superiority."},"cold_screen":{"physical_measurements":0,"classification":"Staged startup and retained-resource energy/exergy screen; all numeric hardware inputs remain targets.","selected_cycle":{"initial_liquid_K":77.3549939095929,"pump_discharge_Pa":1020000.0,"expander_inlet_Pa":1000000.0,"expander_inlet_K":200.0,"expander_outlet_Pa":103325.0,"expander_outlet_K":135.74552853913556,"terminal_pressure_Pa":101325.0,"terminal_temperature_K":263.15,"first_stage_pressure_loss_Pa_assumed":20000.0,"second_stage_pressure_loss_Pa_assumed":2000.0,"pump_DC_J_kg":1946.640227519699,"generator_DC_J_kg":57816.671296605615,"net_DC_before_aux_J_kg":55870.03106908592,"first_heat_input_J_kg":322843.223703497,"second_heat_input_J_kg":133085.60506087806,"conversion_loss_heat_J_kg":5222.200657239409,"fluid_first_law_residual_J_kg":0.0},"wet_hardware_mass_target_kg":45.0,"initial_N2_kg":6.0,"steady_batch_N2_kg":2.0,"startup":{"wetted_masses_kg":{"first_core_and_headers":12.368,"second_core":4.0,"wetted_pipe_valve_and_support_fraction":2.0,"wetted_expander_and_pump_fraction":1.5},"total_wetted_mass_kg":19.868000000000002,"initial_metal_K":293.15,"mean_precooled_metal_K_target":205.0,"effective_cp_J_kgK_target":500.0,"duration_s_target":120.0,"warm_air_and_coolant_bypassed":true,"metal_cooldown_heat_J":875682.1,"N2_bypass_mass_kg":2.71240662868686,"pump_DC_J":5280.079856792929,"auxiliary_power_W_target":100.0,"auxiliary_DC_J":12000.0,"electricity_from_startup_J":0,"first_law_residual_J":0.0},"inventory":{"initial_kg":6.0,"startup_kg":2.71240662868686,"steady_kg":2.0,"heatleak_W_target":10.0,"boiloff_kg_screen":0.006440533298466282,"remaining_liquid_kg":1.2811528380146737,"minimum_hold_up_margin_kg":0.35},"electrical":{"steady_net_before_startup_J":93377.49744384189,"startup_input_J":17280.07985679293,"net_after_startup_and_allocated_steady_aux_J":76097.41758704896,"driving_energy_credit_J":0},"exergy":{"minimum_preparation_work_full_charge_J":4450117.254184179,"remaining_cold_inventory_exergy_J":950213.3916160213,"retained_startup_gas_exergy_J":59327.043901611054,"retained_steady_gas_exergy_J":3433.677132226716,"residual_metal_cold_exergy_J":165920.2840025014,"hot_stream_initial_exergy_J":35303.696680842506,"hot_stream_final_exergy_J":19306.34085631783,"spent_nitrogen_reversible_reset_work_with_return_gas_credit_J":3437143.14153432,"idealised_resource_exergy_destroyed_J":3211122.7957692947,"scope":"Pure nitrogen relative to ambient gas. Unspent liquid, cold outlet gases, finite hot streams and cooled metal are retained in the availability ledger. The full-charge preparation number is not the amount of liquid spent. No air-separation, real liquefier, vessel preparation or measured startup qualification is implied."},"startup_auxiliary_sensitivity":[{"startup_auxiliary_W":50,"net_DC_after_startup_and_allocated_steady_aux_J":82097.41758704896},{"startup_auxiliary_W":100,"net_DC_after_startup_and_allocated_steady_aux_J":76097.41758704896},{"startup_auxiliary_W":250,"net_DC_after_startup_and_allocated_steady_aux_J":58097.417587048956},{"startup_auxiliary_W":500,"net_DC_after_startup_and_allocated_steady_aux_J":28097.417587048956}],"mass_target_breakdown_kg":{"first_core_and_headers":12.368,"second_core":4.0,"tank_and_isolation":6.0,"pump_expander_generator":5.0,"ducts_valves_pipes_supports":6.0,"N2_inventory":6.0},"limits":["Tank is already precooled when the recorded inventory is charged; tank preparation is an external requirement, not an uncounted onboard electricity source.","Both warm-side streams are bypassed during the selected pre-cool. Their heat and blower/pump duty begin only during the steady event.","Mean cooled-metal temperature, wetted fractions, 120 s startup and 100 W startup auxiliary input are specified targets, not a startup-flow or stress solution.","Heat transfer, two-phase distribution, seals, material gradients, pressure duty and residual thermal states still require qualification.","All cold energy remains excluded from the driving model."],"mass_target_is_above_screen_sum":true},"scope":"Conditional driving model. Earlier acceleration initialisation remains separate. All hardware targets and installed flow need physical validation."}