ALL-AIR AIR CONDITIONING SYSTEMS
All-air systems use air to heat or cool rooms. They may also have the added capability of controlling humidity and furnishing outdoor ventilation, which hydronic systems cannot do.
A typical all-air heating and cooling system is shown in Fig. 52.4. Air is heated at the heat source (1), such as a furnace. It may also be a coil circulating hot water, or steam, heated by a boiler. The heated air is circulated by a fan (2) and travels to each room through supply air ducts (3). The supply air enters the room through outlets called air diffusers or registers (4) that are designed to provide proper air distribution in the room. When the warmed supply air enters the room, the room is heated. A humidifier (10) may also ...
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