{
  "domain": "hvac-airflow",
  "domain_label": "洁净室换气次数与气流流型",
  "updated": "2026-08-06",
  "exported": "2026-08-07",
  "fact_count": 10,
  "note": "仅含 confidence==verified 且 expose_to 含 facts_api 的事实；字段为公网白名单投影",
  "fields": [
    "fact_id",
    "domain",
    "claim",
    "entity",
    "qualifier",
    "source",
    "exclusive_delta"
  ],
  "facts": [
    {
      "fact_id": "acr.class5.gb50073",
      "domain": "hvac-airflow",
      "claim": "百级（N5）洁净室采用单向流，按断面平均风速 0.2~0.5 m/s 控制，不按换气次数控制",
      "entity": [
        "换气次数",
        "百级洁净室",
        "N5",
        "单向流",
        "断面风速",
        "气流流型"
      ],
      "qualifier": [
        "推荐性条文（表6.3.3，2013 修订由强制改推荐）",
        "单向流",
        "等级系指静态（条文说明6.3.3）",
        "百级 N5 不按换气次数控制而按断面风速控制"
      ],
      "source": "GB 50073-2013《洁净厂房设计规范》表6.3.3 非单向流洁净室换气次数",
      "exclusive_delta": "三口径对照：GB50073 百级按单向流断面风速0.2-0.5 m/s 控制；ISO 14644 不直接规定换气次数/风速（只管粒子浓度），换气是工程实现手段；施工翻车点=误用非单向流换气次数表套百级，致动态粒子超标"
    },
    {
      "fact_id": "acr.class6.gb50073",
      "domain": "hvac-airflow",
      "claim": "千级（N6）洁净室采用非单向流，换气次数 50~60 次/h",
      "entity": [
        "换气次数",
        "千级洁净室",
        "N6",
        "非单向流",
        "气流流型"
      ],
      "qualifier": [
        "推荐性条文（表6.3.3，2013 修订由强制改推荐）",
        "非单向流",
        "层高<4m",
        "静态（条文说明6.3.3）",
        "应根据人员/设备布置取上下限"
      ],
      "source": "GB 50073-2013《洁净厂房设计规范》表6.3.3 非单向流洁净室换气次数",
      "exclusive_delta": "三口径对照：GB50073 千级换气50-60次/h；ISO 14644 不直接规定换气（只管粒子）；实际设计须按热湿负荷/发尘量/新风量三者取大值（条文6.3.2强制性），不同行业（电子/医药）常高于下限"
    },
    {
      "fact_id": "acr.class7.gb50073",
      "domain": "hvac-airflow",
      "claim": "万级（N7）洁净室采用非单向流，换气次数 15~25 次/h",
      "entity": [
        "换气次数",
        "万级洁净室",
        "N7",
        "非单向流",
        "气流流型"
      ],
      "qualifier": [
        "推荐性条文（表6.3.3，2013 修订由强制改推荐）",
        "非单向流",
        "层高<4m",
        "静态（条文说明6.3.3）",
        "应根据人员/设备布置取上下限"
      ],
      "source": "GB 50073-2013《洁净厂房设计规范》表6.3.3 非单向流洁净室换气次数",
      "exclusive_delta": "三口径对照：GB50073 万级换气15-25次/h；ISO 14644 不直接规定换气；施工翻车点=只按下限15次/h 设计致动态（含人员发尘）粒子超标，医药行业常取高于下限"
    },
    {
      "fact_id": "acr.class8to9.gb50073",
      "domain": "hvac-airflow",
      "claim": "十万级~百万级（N8~N9）洁净室采用非单向流，换气次数 10~15 次/h",
      "entity": [
        "换气次数",
        "十万级洁净室",
        "百万级洁净室",
        "N8",
        "N9",
        "非单向流",
        "气流流型"
      ],
      "qualifier": [
        "推荐性条文（表6.3.3，2013 修订由强制改推荐）",
        "非单向流",
        "层高<4m",
        "静态（条文说明6.3.3）",
        "应根据人员/设备布置取上下限"
      ],
      "source": "GB 50073-2013《洁净厂房设计规范》表6.3.3 非单向流洁净室换气次数",
      "exclusive_delta": "口径纠正：表6.3.3 为推荐性设计参考范围（'根据我国实际情况确定'），非强制值；强制性条文是 6.3.2（送风量取热湿负荷/发尘量/新风量三者最大值）"
    },
    {
      "fact_id": "airflow.type.gb50073",
      "domain": "hvac-airflow",
      "claim": "GB 50073 气流流型规定（条文6.3.1）：空气洁净度等级严于4级或4~5级应采用单向流，6~9级采用非单向流",
      "entity": [
        "气流流型",
        "单向流",
        "非单向流",
        "条文6.3.1",
        "等级选型"
      ],
      "qualifier": [
        "推荐性条文（条文6.3.1，气流流型规定）",
        "等级与流型对应关系"
      ],
      "source": "GB 50073-2013《洁净厂房设计规范》条文6.3.1",
      "exclusive_delta": "三口径对照：GB50073 明确规定等级-流型对应关系（≤5级单向流、6~9级非单向流）；ISO 14644-4 表 B.2 给出类似建议但表述为'推荐气流类型'；GMP 不直接规定流型但 A 级默认单向流。施工翻车点=千级（N6）误用单向流（过度设计）或万级误用非单向流断面风速不够"
    },
    {
      "fact_id": "acr.supply.gb50073",
      "domain": "hvac-airflow",
      "claim": "洁净室送风量应取下列三项中的最大值（条文6.3.2，强制性条文）：①满足空气洁净度等级要求的送风量；②根据热、湿负荷计算确定的送风量；③按条文6.1.5要求供给的新鲜空气量",
      "entity": [
        "送风量",
        "热湿负荷",
        "发尘量",
        "新风量",
        "条文6.3.2",
        "强制性条文"
      ],
      "qualifier": [
        "强制性条文（条文6.3.2）",
        "三项取大值原则"
      ],
      "source": "GB 50073-2013《洁净厂房设计规范》条文6.3.2（强制性条文）",
      "exclusive_delta": "口径纠正：行业常把表6.3.3换气次数当唯一设计依据（推荐值），忽略了强制性条文6.3.2'三项取大值'才是真正的风量确定依据；竞品文章多只列换气次数表不讲6.3.2，致设计只按下限取值、动态超标。施工翻车点=只查表不校核热湿负荷，高温车间换气不够"
    },
    {
      "fact_id": "airflow.interlock.gb50073",
      "domain": "hvac-airflow",
      "claim": "正压洁净室启停联锁（条文6.2.4）：启动时先开送风、再开回风/排风，关闭顺序相反；负压洁净室方向相反",
      "entity": [
        "联锁",
        "启停顺序",
        "正压",
        "负压",
        "条文6.2.4",
        "压差控制"
      ],
      "qualifier": [
        "推荐性条文（条文6.2.4，原文\"宜联锁\"）",
        "正压与负压方向相反"
      ],
      "source": "GB 50073-2013《洁净厂房设计规范》条文6.2.4",
      "exclusive_delta": "施工翻车点=负压洁净室（生物安全/产尘）误用正压联锁顺序，启动瞬间污染物外溢；PLC编程时正负压联锁逻辑须分别配置，竞品文章常只写正压不提负压反向逻辑"
    },
    {
      "fact_id": "acr.windduct.gb50073",
      "domain": "hvac-airflow",
      "claim": "洁净空调风管风速限值（条文4.4.6降噪）：总风管 6~10 m/s；无送回风口支风管 4~6 m/s；有送回风口支风管 2~5 m/s",
      "entity": [
        "风管风速",
        "降噪",
        "条文4.4.6",
        "风管设计",
        "噪声控制"
      ],
      "qualifier": [
        "推荐性条文（条文4.4.6）",
        "降噪相关",
        "与4.4.1噪声限值配套"
      ],
      "source": "GB 50073-2013《洁净厂房设计规范》条文4.4.6",
      "exclusive_delta": "施工翻车点=风管风速超标致噪声超标（4.4.1强制性），但设计常只算换气不计风速；有送回风口的支风管须控在 2~5 m/s（最严），这是百级区域噪声达标的关键。竞品文章讲换气/噪声却不连风管风速这条因果链"
    },
    {
      "fact_id": "airflow.unidirectional.def",
      "domain": "hvac-airflow",
      "claim": "单向流（unidirectional flow，原称层流）洁净室气流以均匀平行流线单向流过工作区，分垂直单向流和水平单向流两种形式",
      "entity": [
        "单向流",
        "层流",
        "unidirectional flow",
        "垂直单向流",
        "水平单向流",
        "气流流型"
      ],
      "qualifier": [
        "术语定义",
        "适用于 ISO 1~5 级"
      ],
      "source": "GB 50073-2013《洁净厂房设计规范》条文6.3.1",
      "exclusive_delta": "口径纠正：行业俗称'层流'已被 ISO 14644 标准术语'单向流'替代——层流是流体力学概念（Reynolds层流），洁净室单向流只是'方向一致'不等于 Reynolds 层流。竞品文章仍混用'层流/单向流'不加区分，是术语不规范的表现"
    },
    {
      "fact_id": "airflow.nonunidirectional.def",
      "domain": "hvac-airflow",
      "claim": "非单向流（non-unidirectional flow，原称乱流/混合流）洁净室气流以不均匀流线进入和回流，靠稀释控制粒子浓度，适用于 ISO 6~9 级",
      "entity": [
        "非单向流",
        "乱流",
        "混合流",
        "non-unidirectional",
        "稀释控制",
        "气流流型"
      ],
      "qualifier": [
        "术语定义",
        "适用于 ISO 6~9 级",
        "靠稀释而非置换控制粒子"
      ],
      "source": "GB 50073-2013《洁净厂房设计规范》条文6.3.1",
      "exclusive_delta": "施工翻车点=非单向流洁净室误配单向流送风天花（过度投资）或单向流区误用非单向流（达不到等级）；选型核心看等级（≤5单向流，6~9非单向流），竞品不讲等级-流型匹配原则直接推荐设备"
    }
  ]
}