Book - School of Science and Technology

378 Air-conditioningThe type of system shown in Figure 14.3 is suitable for air-conditioning large singlespaces, such as theatres, cinemas, restaurants, exhibition halls, or big factory spaces whereno sub-division exists. The manner in which the various elements just referred to areincorporated in the plant will be obvious from the caption. It will be noted that in thisexample the cooling is performed by means of chilled water cooling coils and the11121310Air-conditioned room1415C16C8 7 6 5 4 3 117+ – + +91918MMM2 202128262227252324Figure 14.3 Central plant system. 1, frost coil (optional, for fog elimination); 2, pre-filter; 3, preheater;4, secondary filter; 5, chilled water cooling coil; 6, reheater; 7, direct injection steam humidifier; 8, eliminators(optional); 9, supply fan; 10, conditioned air supply; 11, high level smoke extract; 12, smoke exhaust fan;13, smoke discharge to outside via louvre; 14, extract and recirculation; 15, main extract fan; 16, dischargeto outside via motorised damper and louvre; 17, recirculation; 18, steam generator; 19, water make-up;20, outside air intake via motorised damper and louvre; 21, chilled water pump; 22, water chiller evaporator;23, refrigeration compressor; 24, shell and tube condenser; 25, condenser water pump; 26, cooling tower;27, hot water boiler; 28, hot water pump; `M' denotes motorised valves; `C' denotes temperature andhumidity control points