By Jim Harrison
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Additional resources for Data centres : an Introduction to concepts and design
Options on direct expansion (DX) or chilled water are more straightforward but as a rule these will be dictated by the size of the data hall and IT capacity. Space-cooling options are dependent on rack load capacity; various options from perimeter CRAC/CRAH units to in-rack cooling offer a range of possibilities. The cooling option, space configuration, cabinet selection/ arrangement and likely equipment types should all be considered in a holistic manner for design goals to be achieved. The term ‘space cooling’ is misleading as the critical factor is IT equipment cooling and, since these spaces are largely unoccupied, focusing on space cooling can be an energy waster.
Beneficial access to areas of the site and phased handover are often a client requirement and will need to be programmed in. — Site security is essential if vandalism and theft etc, which may cause major disruption to the programme, are to be avoided. It is important that detailed security arrangements are in place. — Fire safety will be of paramount importance when working within a ‘live’ data-centre environment and this will also require the strict control of ‘hot works’ and permits to work.
3 confirmed All building secure doors, including thethe CERbuilding and UPS plant room doors, are released on second knock, the main panel. A fire elsewhere within will release all secure doors, including theviaCER and FA UPS plant room doors, via the A confirmed fire elsewhere within the building will release all secure doors, including the CER and UPS plantroom doors, via the ma ????????? main FA panel. Data centres: an introduction to concepts and design 37 Aspirating smoke detection systems (ASD) Aspirating smoke detectors (ASD) (see Figure 22) and high security sampling detectors (HSSD) are normally provided for the purposes of early warning and are quite different from conventional spot type smoke detectors.