Control and instrumentation technology in HVAC : PCs and by Michael F. Hordeski

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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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.

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