{
    "title": "ISAAC Solar Ice Maker",
    "inventor_name": "Donald Erickson",
    "publication_year": null,
    "device_name": "ISAAC Solar Icemaker",
    "goal": "Provide low-cost ice and refrigeration for unelectrified rural communities using solar thermal energy.",
    "problem_addressed": "Lack of affordable refrigeration and ice in developing rural areas, dependence on diesel fuel or electricity.",
    "concept_summary": "The ISAAC Solar Icemaker is a solar-thermal powered ammonia-water absorption refrigeration system that uses a parabolic trough collector to generate high-pressure ammonia vapor during the day and a thermosyphon to cool the generator at night, producing ice without moving parts, fuel, or electricity.",
    "detailed_description": null,
    "category": "Thermal Systems",
    "principles": [
        "Solar thermal heating",
        "Ammonia-water absorption refrigeration",
        "Thermosyphon heat removal",
        "Parabolic trough solar collector"
    ],
    "scientific_domains": [
        "Thermodynamics",
        "Heat Transfer",
        "Refrigeration Engineering",
        "Solar Energy"
    ],
    "mechanisms_of_action": [
        "Absorption cycle",
        "Thermosyphon cooling",
        "Solar collector heating"
    ],
    "materials": [
        "Ammonia",
        "Water",
        "Steel",
        "Copper"
    ],
    "energy_sources": [
        "Solar thermal energy"
    ],
    "inputs": [
        "Solar radiation",
        "Ambient air"
    ],
    "outputs": [
        "Ice",
        "Cold water"
    ],
    "claimed_performance": "Approximately 5 kg of ice per square meter of collector per sunny day (~=6 blocks of ice per day, each 10 kg).",
    "experimental_evidence": "Over forty systems have been built and twenty installed in seven countries; the ISAAC is on display at Sandia National Laboratory and is being commercialized by Solar Ice Co.",
    "replication_status": "Multiple field installations (~=20) across seven countries demonstrate replication.",
    "keywords": [
        "Solar refrigeration",
        "Absorption cycle",
        "Ammonia-water",
        "Ice maker",
        "Rural development"
    ],
    "related_technologies": [
        "Absorption refrigeration",
        "Solar thermal collectors",
        "Parabolic trough",
        "Thermosyphon"
    ],
    "controversy_level": "low",
    "confidence_score": 0.9,
    "practicability_score": 0.8,
    "fringe_score": 0.1,
    "evidence_strength": 0.6,
    "risk_score": 0.1,
    "trl_estimate": 6,
    "source_urls": [],
    "organizations": [
        "Energy Concepts Co., LLC",
        "Solar Ice Co."
    ],
    "applications": [
        "Rural ice production",
        "Cold storage for food",
        "Domestic refrigeration"
    ],
    "limitations": [
        "Depends on sufficient solar insolation",
        "Limited ice output per collector area",
        "Requires handling of ammonia and water"
    ],
    "open_questions": [
        "Long-term durability of the absorber and generator components",
        "Performance under varying climatic conditions",
        "Cost-effective scaling to larger community sizes"
    ],
    "red_flags": [],
    "evidence_quotes": [
        "The daily ice production of the ISAAC is about 5 kg per square meter of collector, per sunny day.",
        "Over forty systems have been built and twenty installed in seven countries.",
        "The ISAAC Solar Icemaker operates in two modes. During the day, solar energy is used to generate liquid ammonia refrigerant. During the night, the generator is cooled by a thermosyphon and ice is formed in the evaporator compartment as ammonia is reabsorbed to the generator.",
        "The construction of the ISAAC Solar Icemaker involves only welding, piping and sheet metal work, and there are no expensive materials."
    ]
}