[AC] [EL] [FS] 問﹕試講講Data Center Design 有啲乜要注意？

答﹕

[AC]

Design Condition:
In General, D.B.: 18℃, R.H.: Less than 60%; 當然亦都要睇件Datacom Equipment環境溫/濕度需求

Data Center 同 Non Data Center 既Chiller分開比，Data Center Area 要N+1 Redundancy;
Gas Purging System要有個手動Exhaust Fan, 因為如果起咗Total Flooding System的話，就要靠呢把Fan嚟清；

計Sensible Load方面，ASHRAE都有比個趨勢估算出嚟，見得出Scientific用既GPU比雲儲存散熱更高；Communication 係最低；

上述係講緊一隻42U櫃既散熱量，42U係咁既樣

1U就即係入一件

有Liquid-Cooled, 呢種玩法就要確保响Dew Point以上防Condense


有Air-Cooled, 通常都係由地板入


Air-Cooled用Computer Room Air Conditioning CRAC Unit

[EL]

詳見 https://elvissharing.blogspot.com/2020/03/el-how-to-plan-design-electricity.html , 都係啲無限備份玩法。

Electrical Busway, 响上面好似電車路軌咁攞電




UPS可能會用有Flywheel嗰種，Wiki話係online方式，養住隻轉緊既飛輪可以頂住30s 等Genset起動， 及見 https://elvissharing.blogspot.com/2020/04/el-uninterruptible-power-supply-ups.html

此外為咗避免EMI Interference, IT cables 走High Level; Power Cable 行Raised Floor;
要因應BEEO裝Digital Power Analyzer 計住電流、電壓、功率 (7.7 Metering & Monitoring Facilities, Main Circuit, Feeder & Sub-main Circuit)

[FS]

Total Flooding System, see https://elvissharing.blogspot.com/2020/04/fs-gaseous-extinguishing-system.html

Very Early Smoke Detection Apparatus, see https://elvissharing.blogspot.com/2020/04/fs-automatic-fire-alarm-system.html , 但留意呢個System係唔會用嚟踢著FM200, 只係為咗早啲知

[MISC]

Water Leakage Detection (Linear Type)


Structured Cabling System
有Copper Cable & Fiber, 兩者各有優勢所以响Data Center度會混合嚟用。放線方式有國際標準或ER要求。
Optical Fiber: 輕、距離遠、速度快；
Copper Cable: 更可靠、响Data Center裡面功率低散熱少耗電少；

Cat5, Cat5e, Cat5 分別

(鳴謝﹕紅豆；Source: 2019 ASHRAE Handbook Application - Chapter 20)