Document nNNKzaG9Zj3JVKvNbOZ9qNbVw

AIR CONDITIONING 227 i jB||prature of the air is always to be above room temperature, the ?jnlj^et|lfprth above under supplying heat can be followed. However, if it ^,^{;|fj^to'*ring the air in at less than room temperature to offset the heat ^^^mSiproteises, greater care must be exercised to see that proper diffusion are maintained. If any smoke or fumes are generated in the |anore important to introduce this air as close to the actual rffzone!#ahd as near the floor as is practical. In most installations the ^Pna-v.elieen between 8 and 10 feet from the floor. SIS S. Removing Heat Wflmipn Only. When air is introduced into a space during warm jullpmrpose of reducing the effective temperature, the air motion is jffiifc.'The reduction of effective temperature is. accomplished by the jpf||ofi.heat loss by evaporation and convection from the body due to lllllm..Under such circumstances there does not seem to be agreement jllficjoities may be used. The effective temperature chart shows' the j8B|i||&up to 700 feet per minute; however, fnany of the hot industries ^Slgj'.pf 3000 feet per minute and more (see Chapter XXI). . :$found to be most desirable and effective to supply the air as near r |a||is practical. In this way the coolest air available is moved across same time the minimum amount of heat, smoke, and fumes is fllve ,air supply before it comes in contact with the occupants. An|mnj'|MpU;etr^--o--f---s-u---p--plying'nieTaiF in' this manner' Hf that if the outside, air ej^^Meduced either by local storms or by the normal drop of temperature |yhn^fie people inside immediately get the benefit. This is not true if p^'Sjat the ceiling of the building. In a number of plants air is intro- Ba^mg|SS|gL.either from tunnels'or from duct work brought down to the floor V-'lwflp? the air to be distributed around the, people with an absolute Jsmoke or heat entrainment. The selection;.of grilles for such an particular importance. They should be easily adjustable, type that may be adjusted by the room occupants so that the ijj&nteftgtueed directly on them when the building is hot and near them fiWEad^toperatures are too cool for direct contact. It may be that the ^^pSpade two' orTrtiree times a day depending'on" circumstances. (^^Kj^ustMal grilles has been especially designed by one manufacturer to ' * There are no dampers on these grilles to allow the the air supply, but they may be obtained'with adjustable CooKnfThe, same rules apply when supplying air from '"'""'tijSQpoler as when only air motion is desired. In fact, part of the iiy may be interrupted and the unit used only to supply air. i must be remembered with both of these methods is that large