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1905.751213956968, "expander_shaft_J_kg": 63227.36973108003, "generator_DC_J_kg": 58169.180152593624, "net_DC_before_unallocated_auxiliaries_J_kg": 56263.42893863666, "first_heat_input_J_kg": 322880.02381570346, "second_cooling_heat_input_J_kg": 133468.76686086503, "new_conversion_loss_heat_J_kg": 5248.764699882099, "minimum_temperature_approach_K": 66.85000000000002, "fluid_first_law_residual_J_kg": 5.820766091346741e-11, "initial_cold_fluid_availability_J_kg": 741686.2090306964, "terminal_fluid_availability_J_kg": 1716.8385661141583, "exergy_balance_residual_J_kg": 0.0, "pump_entropy_rise_J_kgK": 7.73290062432261, "expander_entropy_rise_J_kgK": 287.274542062235, "first_heater_entropy_generation_at_300K_J_kgK": 1805.1357034885173, "second_heater_entropy_generation_at_330K_J_kgK": 290.2154290798641, "efficiencies_assumed": { "pump": 0.65, "expander": 0.65, "generator": 0.92, "pump_motor": 0.9 }, "max_fluid_mass_kg_from_first_heat_envelope": 9.022597969264945, "max_fluid_mass_kg_from_existing_loss_heat_plus_new_loss_recovery": 2.149083890560641, "allocated_N2_mass_kg": 2.0, "gross_net_DC_before_unallocated_auxiliaries_J": 112526.85787727332 }, "source": "https://coolprop.org/fluid_properties/fluids/Nitrogen.html", "physical_interpretation": "Finite cold-store and pressure/heat conversion opportunity. Liquid production/recharge, heat exchangers and unallocated auxiliaries are not free. This is not energy created by a vacuum.", "resource_basis": { "first_heat_envelope_J": 2913216.647195783, "existing_electrical_path_loss_heat_J": 275555.54109181894, "time_reference_s": 8.28, "first_heat_envelope_is_a_requirement_screen_not_measured_UA": true }, "vehicle_energy_credit_J": 0.0, "limits": [ "No driving result receives this electrical output. Pump, expander, storage, heat exchanger, flow pressure loss and additional mass are not yet integrated into the four-wheel vehicle.", "The 2 kg cap is a finite proposed inventory, not an optimised or installed tank. Containment and hardware mass are excluded from this standalone thermodynamic screen.", "First heating uses a specified 300-to-280 K heat-source envelope; the real transient air-to-nitrogen exchanger has not been designed or measured.", "Second cooling is limited by the earlier calculated electrical conversion heat, plus the new generator/pump conversion losses counted exactly once.", "Auxiliary circulation, valves, control, boil-off, temperature approaches under real flow and nitrogen liquefaction/recharge energy must still be measured or allocated. Net useful vehicle benefit is unestablished.", "Pressure and cryogenic states are analysis points, not fabrication instructions." ] }