M&E operations
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Data center power, cooling, water and fire: power distribution, cooling, environment monitoring, fire safety and operations
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- HVAC and coolingUnited States
机房温湿度：ASHRAE TC9.9 推荐区间与允许区间
- 推荐区间（A1–A4 类设备）：进风干球温度 18–27℃，露点不高于 15℃、相对湿度不高于 60%。
- 允许区间按设备等级放宽：A1 为 15–32℃、相对湿度上限 80%，A4 可到 5–45℃。
- 推荐区间是建议而非强制，适当提高送风温度、延长自然冷却时间是降低 PUE 的常用做法。
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