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

By Michael F. Hordeski

ISBN-10: 0585295816

ISBN-13: 9780585295817

(The Fairmont Press, Inc.) Examines the connection among business automation innovations and evolving HVAC structures, and the way rising applied sciences could be utilized to HVAC structures. themes lined comprise boiler and pump keep watch over, warmth pump and chiller optimization, laptop keep watch over, and instant regulate. DLC: Heating--Automatic regulate.

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Sample text

These are even operated in a basic on­off fashion with a very basic control loop.  Typical operating modes include: • Startup, • Occupied, • Unoccupied or night and • Purge or free­cooling.  One approach is to calculate the amount of heat that needs to be transferred and divide it up according to the capacity of the startup equipment.  It can also recognize weekends and holidays and provide a flexible means for time­ of­day controls.

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.

Typical operating modes include: • Startup, • Occupied, • Unoccupied or night and • Purge or free­cooling.  One approach is to calculate the amount of heat that needs to be transferred and divide it up according to the capacity of the startup equipment.  It can also recognize weekends and holidays and provide a flexible means for time­ of­day controls.

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

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