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5 Grounding and Bonding
Published in C. Sankaran, Power Quality, 2017
Some installations use copper strips instead of circular conductors to form the grid. Other facilities might use sheets of copper under the floor of the computer center as the SRG. Constructing an SRG with a continuous sheet of copper creates a reference plane made up of infinite parallel paths instead of a discrete number of parallel paths as with SRGs made up of circular wires. The SRG is also bonded to the building steel and the stanchions that support the raised floor of the computer center. Such an arrangement provides excellent noise immunity and allows the creation of a good reference plane for the sensitive circuits. Figure 5.9 depicts how an SRG for a large-sized computer center might be configured. Some installations use aboveground wiring methods instead of a raised-floor configuration. The principle behind the configuration of the SRG does not change whether the ground
Carbon-Neutral Architectural Design in Academia
Published in Pablo La Roche, Carbon-Neutral Architectural Design, 2017
In the winter a solar attic in the roof heats the air while a small fan pumps it down under the raised floor, warming the indoor space with warm air from the underfloor air distribution system. Tests in the building in Mexico measured air coming from below at 33°C. This concept was tested by several students and in different configurations (Figure 3.113). Several versions of the system were also developed. The final one is shown in Figure 3.114. Thermal mass in the attic stores heat to provide some nighttime use. There are a total of five buildings and one of them is finished with another under construction (Figures 3.115 through 3.117).
Electrical Equipment in a Corrosive Environment
Published in Bella H. Chudnovsky, Transmission, Distribution, and Renewable Energy Generation Power Equipment, 2017
Another form of particulate contamination very harmful to hardware reliability is the zinc whiskers, which are the most common electrically conductive particles found in data centers (Figure 3.8b and cin Section 3.5 of Chapter 3). the undersides of some steel-raised floor tiles are coated with zinc to prevent corrosion. The stringers and pedestals supporting the tiles may also be coated with electroplated or hot-dip galvanized (HDG) zinc. Zinc whiskers may grow on both types of coatings, although electroplated zinc is far more susceptible to whisker growth [4,5].
Experimental Study on the Seismic Response of Longhouses Using Scale Models
Published in Structural Engineering International, 2020
Huzaifa Hashim, Zainah Ibrahim, Ahmad Azim Shukri, Siti Nurhanis Yasmin Hastamam, Sai Hin Lai
Site visits to various longhouses were conducted to establish a database for the study, including site surveys and visual damage inspection, to gain an in-depth understanding of longhouse structures. Figure 4 presents a scale physical model of a typical longhouse structure, consisting of structural frames made out of balsa wood. It can be seen that the primary beams located on the first and second floors connect to large timber posts in the x-direction, whereas the perimeter beams rest on top of the large timber posts in the y-direction. The whole structural element was built without using a single nail, with floors being raised off the ground through the use of large timbers for posts, as shown in Fig. 5. The raised floor helps to mitigate problems caused by natural disasters, enemy attack and wild animals, as well as improving ventilation.3,4