ALL-WATER AIR CONDITIONING SYSTEMS
A typical hydronic (all water) heating system is shown in Fig. 52.1. Water is heated at the heat source (1) usually a hot water boiler. The heated water is circulated by a pump (2) and travels to each room through piping (3) and enters a terminal unit (4). The room air is heated by bringing it into contact with the terminal unit. Since the water loses some of its heat to the rooms, it must return to the heat source to be reheated.
Fig. 52.1 Arrangement of basic components of a (hydronic) hot water heating system
If steam is used in a heating system, the components still work in the same manner, with ...