{
  "schemaVersion": "rail-power-loop-1",
  "title": "Can the temporary power cover its own overhead?",
  "domain": {
    "powerKW": [
      0,
      250,
      500,
      750,
      1000,
      1500,
      2000
    ],
    "durationHours": [
      2,
      4,
      6,
      8,
      12,
      16,
      24
    ],
    "conditions": [
      "mild",
      "hot"
    ]
  },
  "default": {
    "powerKW": 750,
    "durationHours": 8,
    "condition": "hot"
  },
  "catalogueCaps": {
    "batteries": 32,
    "converters": 12,
    "coolers": 20
  },
  "batteries": [
    {
      "id": "standard",
      "name": "Standard batteries",
      "usableKWh": 1000,
      "capitalGBP": 320000,
      "landM2": 28,
      "heatKW": 12
    },
    {
      "id": "compact",
      "name": "Compact batteries",
      "usableKWh": 1400,
      "capitalGBP": 600000,
      "landM2": 16,
      "heatKW": 20
    }
  ],
  "converters": [
    {
      "id": "standard",
      "name": "Standard converters",
      "outputKW": 250,
      "lossKW": 8,
      "capitalGBP": 75000,
      "landM2": 12
    },
    {
      "id": "efficient",
      "name": "Efficient converters",
      "outputKW": 250,
      "lossKW": 3,
      "capitalGBP": 115000,
      "landM2": 8
    }
  ],
  "coolers": [
    {
      "id": "air",
      "name": "Air cooling",
      "removalKW": 40,
      "drawKW": 12,
      "capitalGBP": 30000,
      "landM2": 12
    },
    {
      "id": "liquid",
      "name": "Liquid cooling",
      "removalKW": 70,
      "drawKW": 8,
      "capitalGBP": 75000,
      "landM2": 6
    }
  ],
  "conditions": [
    {
      "id": "mild",
      "name": "Mild conditions",
      "batteryEnergyNumerator": 1,
      "batteryEnergyDenominator": 1,
      "batteryHeatNumerator": 1,
      "batteryHeatDenominator": 1,
      "coolerCapacityNumerator": 1,
      "coolerCapacityDenominator": 1
    },
    {
      "id": "hot",
      "name": "Hot conditions",
      "batteryEnergyNumerator": 4,
      "batteryEnergyDenominator": 5,
      "batteryHeatNumerator": 3,
      "batteryHeatDenominator": 2,
      "coolerCapacityNumerator": 4,
      "coolerCapacityDenominator": 5
    }
  ],
  "interfaces": [
    {
      "id": "energy",
      "label": "Battery energy",
      "unit": "kWh",
      "requirement": "H * (P + cooler draw + converter loss)",
      "supply": "battery count * usable pack energy"
    },
    {
      "id": "conversion",
      "label": "Converter output",
      "unit": "kW",
      "requirement": "P + cooler draw",
      "supply": "converter count * output rating"
    },
    {
      "id": "cooling",
      "label": "Heat removal",
      "unit": "kW",
      "requirement": "battery heat + converter loss",
      "supply": "cooler count * removal rating"
    }
  ],
  "traceColumns": [
    "iteration",
    "batteries",
    "converters",
    "coolers",
    "heatKW",
    "coolingKW",
    "drawKW",
    "lossKW",
    "capitalGBP",
    "landM2"
  ],
  "boundary": "Declared synthetic steady-load sizing model. No measured site data, transient load, electrical protection, charging, reliability, construction sequence or safety approval is modelled. Hot is a declared scenario, not an uncertainty distribution or universal worst case.",
  "physicalAssumptions": {
    "usableEnergy": "Net DC energy available after cell-internal losses; converter losses and cooling electricity are accounted separately.",
    "batteryHeat": "Synthetic thermal design allowance per operating pack; not a claim that actual heat must increase whenever packs are added at a fixed load.",
    "converterLoss": "Constant design allowance per operating unit, counted as both battery energy demand and heat to remove.",
    "operation": "All selected units are operating throughout the declared constant-load outage. No charging is modelled."
  }
}