{
  "id": "C-15",
  "title": "Pressure-tuned composition (Tb into the cold-plate band at sub-atmospheric P)",
  "type": "composition",
  "gap_refs": [
    "G2",
    "G10"
  ],
  "claim_scaffold": {
    "independent": [
      "A two-phase coolant composition whose normal boiling point lies above the cold-plate operating band at 1 atm but is brought into a 35-70 C window by operating the loop at a sub-atmospheric pressure selected from the composition's Clausius-Clapeyron/CoolProp Tb(P) curve, matching the ASHRAE facility-water class."
    ],
    "dependents": "Dependents: P in 0.5-1.0 atm; per facility-water class (W27-W45).",
    "filed_overlap": "Nearest filed: none (Tb gates assume 1 atm). DISTINCT: composition + operating-pressure as a joint claim, enabling otherwise-too-high-Tb PFAS-free fluids."
  },
  "enabling_assets": [
    "scripts/lockspace/pressure_axis.py",
    "docs/PRESSURE_TUNED_OPTIMA.md",
    "data/processed/lockspace/pressure_axis.json"
  ],
  "novelty": {
    "score": 0.603,
    "axis": 3,
    "backends_used": [
      "openalex",
      "crossref"
    ],
    "backends_skipped": [
      "epo_ops",
      "patentsview"
    ],
    "n_examined": 12,
    "closest_art": [
      {
        "id": "10.2139/ssrn.4886622",
        "title": "Investigation on Mechanism and Improvement of Intermittent Boiling Employing Di Water At\u00a0Sub-Atmospheric Pressure for Two-Phase Immersion Cooling in Data Centers",
        "year": 2024,
        "source": "crossref",
        "url": "https://doi.org/10.2139/ssrn.4886622",
        "venue": "",
        "snippet": "",
        "cited_by": 0,
        "term_overlap": 0.429
      },
      {
        "id": "10.1615/ihtc13.p28.230",
        "title": "TWO-PHASE PRESSURE DROP AND VOID FRACTION DURING FLOW BOILING OF A HYDROCARBON FLUID",
        "year": 2006,
        "source": "crossref",
        "url": "https://doi.org/10.1615/ihtc13.p28.230",
        "venue": "Boiling",
        "snippet": "",
        "cited_by": 4,
        "term_overlap": 0.286
      },
      {
        "id": "10.2172/4837981",
        "title": "TWO-PHASE PRESSURE DROP IN A NATURAL CIRCULATION BOILING CHANNEL",
        "year": 1961,
        "source": "crossref",
        "url": "https://doi.org/10.2172/4837981",
        "venue": "",
        "snippet": "",
        "cited_by": 2,
        "term_overlap": 0.286
      }
    ],
    "retrieved": "2026-06-09",
    "known_blockers": [
      "refrigerant pressure-control art"
    ]
  },
  "certainty": {
    "key_quantity": "system CHF (W/cm^2, est.)",
    "lead_proxy": "HFO-1336mzz-Z + vinylene carbonate 70:30 (discovery)",
    "ci90": [
      40.4,
      210.1
    ],
    "median": 105.3,
    "axis": 3,
    "calibration": "thermo sigma AAD 0.5%, Tb 0.1C (Phase-B); MC N=20k seed 7"
  },
  "urgency": {
    "score": 1.0,
    "axis": 5,
    "primary_driver": "ECHA_PFAS",
    "drivers": [
      {
        "driver": "ECHA_PFAS",
        "nearest_date": "2025-12-31",
        "citation": "ECHA Annex XV restriction report, submitted 13 Jan 2023 by DE/NL/DK/SE/NO; RAC/SEAC opinion-forming 2023-2025.",
        "applies_because": "displaces 306-94-5, 307-34-6, 311-89-7, 355-42-0, 756-13-8"
      },
      {
        "driver": "AI_DC_GROWTH",
        "nearest_date": "2026-06-09",
        "citation": "IEA Electricity 2024 / datacenter energy outlooks; rack power densities exceeding air-cooling limits drive two-phase adoption.",
        "applies_because": "secular demand"
      }
    ]
  },
  "proof": {
    "tier0_consensus": 0.2,
    "engines_min": 1,
    "limiting_component": "692-49-9",
    "md_tier": 2,
    "axis": 4,
    "md_grade": "full",
    "md_seeds": 4,
    "md_component_sigma": {
      "692-49-9": {
        "sigma_mNm": 16.06,
        "sem": 0.29,
        "n_seeds": 4
      },
      "872-36-6": {
        "sigma_mNm": 38.17,
        "sem": 1.02,
        "n_seeds": 4
      }
    },
    "md_blend_sigma": {
      "sigma_298_mNm": 19.63,
      "dsigma_dT_mNm_per_K": -0.0576
    },
    "chf_input_rel_uncertainty": 0.25,
    "tier_status": {
      "tier0_solver_consensus": "weak",
      "tier1_md": "full",
      "tier2_cfd": "pass",
      "tier3_wetlab": "not_run"
    }
  },
  "fto_flag": "LOW",
  "fto_axis": 5,
  "fto_chart": {
    "max_overlap": 0.094,
    "heuristic_risk": "LOW",
    "n_blockers_compared": 4
  },
  "design_space_cells": null,
  "property_card": {
    "epsilon": 12.827,
    "mu_mPas": 0.0167,
    "miscibility": "miscible (single phase)"
  },
  "tco": {
    "vs_air": {
      "delta_tco_usd_per_mw_median": 1500000.0,
      "ci90": [
        750000.0,
        2600000.0
      ],
      "p_lead_cheaper": 1.0,
      "confidence_tag": "PLACEHOLDER"
    },
    "vs_novec": {
      "delta_tco_usd_per_mw_median": 2300000.0,
      "ci90": [
        1100000.0,
        4500000.0
      ],
      "p_lead_cheaper": 1.0,
      "confidence_tag": "PLACEHOLDER"
    },
    "density_source": "MD_NPT (Modal campaign)"
  },
  "cfd_tier2": {
    "peak_U_cold": 0.257273,
    "peak_U_hot": 0.502571,
    "capillary_sensitivity": 0.512
  },
  "value_driver": "Composition+pressure joint royalty; widens the PFAS-free candidate set per facility-water class.",
  "filing_route": "provisional",
  "score": {
    "N": 3,
    "U": 5,
    "C": 3,
    "P": 4,
    "F": 5,
    "total": 23,
    "formula": "2N+U+C+P+F (max 30)"
  },
  "status": "counsel_ready",
  "expected_casualty": false,
  "honesty": {
    "computational_not_measured": true,
    "no_best_fluid_claim": true,
    "language_doc_compliant": true
  }
}