{
  "basis": "Independent teaching assumptions, not manufacturer data; no experimental calibration or validation",
  "ambient_C": 25.0,
  "initial_C": 25.0,
  "heat_off_s": 600,
  "end_s": 1800,
  "grid_mm": 2.0,
  "dt_s": 2.0,
  "viewer_interval_s": 30,
  "vtk_interval_s": 60,
  "external_effective_h_W_m2K": 8.0,
  "cell_heat_W": 2.0,
  "electronics_heat_scale_from_CAD": 0.25,
  "cell_localized_fraction": 0.8,
  "cell_patch_global_mm": [
    27,
    84,
    39,
    102
  ],
  "properties": {
    "Battery": {
      "rho_kg_m3": 2400,
      "cp_J_kgK": 1000,
      "kxy_W_mK": 20,
      "kz_W_mK": 0.8
    },
    "MainPCB": {
      "rho_kg_m3": 1900,
      "cp_J_kgK": 900,
      "kxy_W_mK": 12,
      "kz_W_mK": 0.5
    },
    "RFPCB": {
      "rho_kg_m3": 1900,
      "cp_J_kgK": 900,
      "kxy_W_mK": 12,
      "kz_W_mK": 0.5
    },
    "Midplate": {
      "rho_kg_m3": 2700,
      "cp_J_kgK": 900,
      "kxy_W_mK": 160,
      "kz_W_mK": 160
    },
    "Frame": {
      "rho_kg_m3": 2700,
      "cp_J_kgK": 900,
      "kxy_W_mK": 160,
      "kz_W_mK": 160
    },
    "Display": {
      "rho_kg_m3": 2500,
      "cp_J_kgK": 800,
      "kxy_W_mK": 1,
      "kz_W_mK": 0.5
    },
    "BackGlass": {
      "rho_kg_m3": 2500,
      "cp_J_kgK": 800,
      "kxy_W_mK": 1,
      "kz_W_mK": 1
    },
    "package": {
      "rho_kg_m3": 2000,
      "cp_J_kgK": 800,
      "kxy_W_mK": 3,
      "kz_W_mK": 3
    },
    "RFPad": {
      "rho_kg_m3": 2200,
      "cp_J_kgK": 1000,
      "kxy_W_mK": 3,
      "kz_W_mK": 3
    },
    "GraphiteSpreader": {
      "rho_kg_m3": 1800,
      "cp_J_kgK": 700,
      "kxy_W_mK": 800,
      "kz_W_mK": 5
    },
    "SpreaderAdhesive": {
      "rho_kg_m3": 1200,
      "cp_J_kgK": 1500,
      "kxy_W_mK": 0.2,
      "kz_W_mK": 0.2
    }
  },
  "contacts": {
    "area_resistance_m2K_W": 0.0002,
    "adhesive_thickness_mm": 0.15,
    "adhesive_k_W_mK": 0.5,
    "underboard_TIM_thickness_mm": 0.25,
    "underboard_TIM_k_W_mK": 3.0,
    "pedestal_height_mm": 0.95,
    "pedestal_k_W_mK": 160,
    "support_k_W_mK": 110,
    "support_height_mm": 1.2,
    "rf_post_radius_mm": 0.35,
    "rf_post_height_mm": 0.6,
    "air_k_W_mK": 0.026,
    "linearized_internal_radiation_W_m2K": 4.0
  },
  "cases": {
    "cell": {
      "label": "Battery only \u00b7 2 W",
      "battery_scale": 1,
      "electronics_scale": 0
    },
    "electronics": {
      "label": "Electronics only \u00b7 1.75 W",
      "battery_scale": 0,
      "electronics_scale": 1
    },
    "combined": {
      "label": "Battery + electronics \u00b7 3.75 W",
      "battery_scale": 1,
      "electronics_scale": 1
    }
  },
  "scope": "Seven spatial layers plus seven lumped chip packages. Each spatial layer has one temperature through its thickness. Closed-product external losses on display, back glass and outer frame only. Internal air gaps use conduction plus a fixed linearized radiative conductance; no air-flow solve. PCB holes retained; USB slot omitted in the homogenized frame. Adhesive, mounts, pedestal, TIM and RF posts collapsed into massless conductances. BMS, connectors, passives, camera, speaker, haptic and optional top bridge are omitted from the thermal network. The existing full CAD remains context; omitted solids stay gray.",
  "rf_pad": {
    "footprint_global_mm": [
      47,
      54,
      63,
      59
    ],
    "bottom_z_mm": 4.8,
    "installed_thickness_mm": 2.2,
    "k_W_mK": 3.0,
    "rho_kg_m3": 2200,
    "cp_J_kgK": 1000,
    "contact_resistance_each_m2K_W": 0.0002,
    "basis": "Illustrative compressed pad, not a selected commercial product; pressure, compression mechanics and temperature dependence are unresolved"
  },
  "comparison": "Pad only = exact Stage 04 pad case. Graphite = 30 x 50 x .10 mm sheet plus .025 mm adhesive beneath back glass, shortening the pad from 2.2 to 2.075 mm to keep the enclosure fixed. Internal gaps terminate on graphite where covered; old covered paths are removed. Sources, original materials, exterior losses and timing remain fixed. Diagnostic control uses the same new geometry/masses/vertical properties, changing only graphite kxy from 800 to 5 W/mK. All values are teaching assumptions.",
  "graphite": {
    "footprint_global_mm": [
      38,
      30,
      68,
      80
    ],
    "thickness_mm": 0.1,
    "kxy_W_mK": 800.0,
    "kz_W_mK": 5.0,
    "rho_kg_m3": 1800,
    "cp_J_kgK": 700,
    "diagnostic_kxy_W_mK": 5.0,
    "basis": "Illustrative anisotropic graphite, not a selected vendor grade or a measured laminate"
  },
  "spreader_adhesive": {
    "thickness_mm": 0.025,
    "k_W_mK": 0.2,
    "rho_kg_m3": 1200,
    "cp_J_kgK": 1500,
    "contact_resistance_each_m2K_W": 0.0001,
    "basis": "Illustrative bonded adhesive with finite thermal capacity; two contact resistances"
  }
}