By john. Floor. Published at Tuesday, August 28th, 2018 - 09:10:29 AM.
Telcordia GR-2930 Telcordia NEBS: Raised Floor Generic Requirements for Network and Data Centers, GR-2930 presents generic engineering requirements for raised floors that fall within the strict NEBS guidelines. There are many types of commercially available floors that offer a wide range of structural strength and loading capabilities, depending on component construction and the materials used. The general types of raised floors include stringer, stringerless, and structural platforms, all of which are discussed in detail in GR-2930.
The general types of raised floors in telecommunications data centers include: stringerless, stringered, Stringerless raised floors — an array of pedestals that provide the necessary height for routing cables and also serve to support each corner of the floor panels. Stringered raised floors — a vertical array of steel pedestal assemblies (steel base plate, tubular upright, and a head) uniformly spaced on 2-foot centers and mechanically fastened to the concrete floor.
The general types of telecommunications data centers include: structural platforms and, truss assemblies. Structural platforms — members constructed of steel angles or channels that are welded or bolted together to form an integrated platform for supporting equipment. Truss assemblies — utilizing attachment points to the subfloor to support a truss network on which the floor panels rest. The truss has high lateral strength and transfers lateral loads to the subfloor with less strain than possible with a vertical pedestal assembly.
Cooling load implications Raised Floor The installation of a raised floor system can change the thermal behavior of the building by reducing the interaction between the heat gains and the thermally massive concrete slab. The raised floor serves as a separation between the room and the slab. Energy simulations of an office building located in San Francisco showed that the mere presence of the raised floor affects the zone cooling load profile and tends to increase the peak cooling load. When carpeting is present the negative impact of the raised floor on zone peak cooling load may be reduced.
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