By Michael F. Hordeski
(The Fairmont Press, Inc.) Examines the connection among commercial automation suggestions and evolving HVAC structures, and the way rising applied sciences could be utilized to HVAC structures. themes lined comprise boiler and pump keep an eye on, warmth pump and chiller optimization, laptop keep an eye on, and instant keep an eye on. DLC: Heating--Automatic keep an eye on.
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Extra resources for Control and instrumentation technology in HVAC : PCs and environmental control
The zone temperature controls are used to energize the individual zone electric resistance heaters. This is done by deenergizing the supply air fan and closing the outside air dampers. Colddeck and hotdeck ducts extend from the unit to the conditioned areas. Selected zones are used to set the colddeck and hotdeck supply temperatures to minimize energy wastage from the mixing of cold and hot air. The latter technique may have some instability during startup and during light loads when some cold deck valves open and upset the pressure balance in the system; otherwise, it functions the same as the dualduct, constant volume system.
The PIU fan provides an almost constant volume supply of air. Each zone temperature controller resets the colddeck controller to supply the highest colddeck temperature that will satisfy the zone with the greatest cooling load. The setpoint is usually set in reverse sequence using an outside temperature sensor to increase the hotdeck air temperature as the outside air temperature decreases. The zone temperature controls are used to energize the individual zone electric resistance heaters.
The conditioning of air and water is performed in a remote central plant and Page 22 then distributed to terminal units in the conditioned space. The chilled and heated water is delivered to the building from the central plant using a 2pipe changeover or 3 or 4pipe simultaneous piping system. Airwater systems include fancoil units with central ventilating air, terminal reheat units, induction reheat terminals, underwindow induction terminals and fanpowered induction terminals. The terminal unit provides cooling and dehumidification or heating according to the zone requirements.