{
    "title": "Cooling / Heating Textile",
    "inventor_name": "Isik Tarakcioglu et al.",
    "publication_year": 2007,
    "device_name": "Phase-Change Cooling/Heating Textile",
    "goal": "Provide passive cooling in hot weather and optional heating in cold weather while reducing energy consumption of HVAC systems.",
    "problem_addressed": "Excessive heat buildup in clothing, car seats, hats, curtains and building interiors; high energy use for air-conditioning and heating.",
    "concept_summary": "A textile is infused with inexpensive sodium-sulfate hydrate phase-change material (PCM). The PCM absorbs latent heat when ambient temperature rises, keeping the wearer's skin cooler, and releases heat when the temperature falls, providing a modest heating effect. The same principle is applied to a flexible solar water-heating collector that uses a black fabric with a water-tight coating and capillary flow to transfer solar heat to a fluid.",
    "detailed_description": "The researchers obtained sodium-sulfate hydrate from the Acıgöl volcano and incorporated it into hats, blankets, curtains and car-seat covers. Laboratory tests reported that a 50  deg C ambient temperature felt like 35  deg C when the PCM-treated hat was worn. The PCM cost 0.10 TL per 100 g (~= $0.005). The same PCM can be used as a heater in winter, reducing household heating demand. In a related invention, a black textile (fabric or felt) coated with a water-tight polymer layer is combined with a transparent UV-stable sheet. Water (or a higher-boiling heat-transfer fluid such as mineral oil, glycerin or ethylene glycol) is introduced via a perforated pipe; capillary action draws the fluid through the textile, where solar radiation is absorbed and heat is transferred to the fluid, delivering water temperatures up to 100  deg C or hot-fluid temperatures above 120  deg C. The collector is roll-up-able, inexpensive and can be mounted on roofs, caravans or camping gear.",
    "principles": [
        "Latent heat storage (phase-change material)",
        "Solar absorption by black textile",
        "Capillary wicking of fluid through textile fibers",
        "Thermal insulation (optional)"
    ],
    "scientific_domains": [
        "Thermal engineering",
        "Materials science",
        "Renewable energy"
    ],
    "mechanisms_of_action": [
        "Heat absorption by sodium-sulfate hydrate during melting (cooling effect)",
        "Heat release during solidification (heating effect)",
        "Solar radiation absorption by black fabric",
        "Capillary transport of fluid through textile voids"
    ],
    "materials": [
        "Sodium sulfate hydrate (PCM)",
        "Black fabric or felt",
        "Water-tight polymer coating (e.g., polyurethane)",
        "Transparent polyethylene or polyester sheet",
        "Optional insulation layer (e.g., foam)"
    ],
    "energy_sources": [
        "Ambient heat",
        "Solar radiation"
    ],
    "inputs": [
        "Ambient temperature",
        "Sunlight",
        "Water or heat-transfer fluid",
        "Salt-hydrate PCM"
    ],
    "outputs": [
        "Reduced perceived temperature (~= 15  deg C cooling)",
        "Heated water/fluid up to 100  deg C (direct) or > 120  deg C (heat-transfer fluid)",
        "Potential energy savings of 25-30 % for building HVAC"
    ],
    "claimed_performance": "50  deg C ambient feels like 35  deg C; 25-30 % reduction in HVAC energy use; water heated to 100  deg C; hot-fluid temperatures > 120  deg C; cost <= 0.10 TL per 100 g PCM; collector material < YTL 2 per m^2.",
    "experimental_evidence": "Reported by Dogan news agency and Turkish Daily News; no peer-reviewed data or independent replication provided.",
    "replication_status": "No explicit replication or commercial deployment mentioned in the article.",
    "keywords": [
        "Phase-change material",
        "Cooling textile",
        "Solar water heater",
        "Capillary wicking",
        "Passive thermal regulation"
    ],
    "related_technologies": [
        "PCM-based building envelopes",
        "Flexible solar thermal collectors",
        "Smart textiles"
    ],
    "controversy_level": "low",
    "confidence_score": 0.7,
    "practicability_score": 0.8,
    "fringe_score": 0.2,
    "evidence_strength": 0.4,
    "risk_score": 0.1,
    "trl_estimate": 5,
    "source_urls": [
        "http://www.turkishdailynews.com.tr/article.php?enewsid=77279",
        "http://goldschmidt.info/2013/abstracts/finalPDFs/2382.pdf",
        "WO2014189474",
        "WO2010093339"
    ],
    "organizations": [
        "Aegean University (EA)",
        "Turkish Textile Association Joint Research Center"
    ],
    "applications": [
        "Cooling hats, blankets, curtains, car seats",
        "Passive building cooling/heating",
        "Portable solar water-heating panels for camping, caravans, rooftops",
        "Heat-recovery systems for swimming pools"
    ],
    "limitations": [
        "PCM effectiveness limited to a narrow temperature range",
        "Potential moisture ingress if water-tight coating fails",
        "Freezing of fluid in winter unless antifreeze or oil is used",
        "No long-term durability data"
    ],
    "open_questions": [
        "How many heating cycles can the sodium-sulfate hydrate endure before performance degrades?",
        "What is the lifetime of the water-tight coating under UV exposure?",
        "Can the system be scaled to large building façades cost maintaining cost advantage?",
        "What are the real-world energy-saving percentages across different climates?"
    ],
    "red_flags": [
        "Claims are based on a news report rather than peer-reviewed experiments",
        "No quantitative performance data or independent testing cited",
        "Potential for overstated energy-saving percentages"
    ],
    "evidence_quotes": [
        "\"Temperatures of 50 degrees Celsius feel like 35 degrees Celsius\" - Dogan news agency",
        "\"Phase changing system can save energy by 25-30 percent in curtain and roof systems of houses\" - Tarakcioglu",
        "\"Water can increase up to the boiling temperature (100  deg C) especially in summer periods\" - patent description",
        "\"Cost of 100 grams hydrate, which is used for one hat, is YTL 0.10\" - article",
        "\"The collector can be rolled and transported easily\" - patent description"
    ],
    "category": "Thermal Systems"
}