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What is BMS (Building Managment System)& is AHU / HVAC are
in BMS.
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Answer Posted / venkatesu
BMS contains HVAC System monitoring & controls, Lighting
system controls & Monitoring of all other facility
equipments like elevators, escalators, D.G., U.P.S. ,
Energy meters. BMS also does integration with Fire Alarm
systems, Access control Systems, CCTV systems & Public
address systems for better & optimized usage of all these
systems in any situation. It also measures & store data for
strategic planning of optimizing of energy consumption in
the facility.
Now days DDC controllers communicate each other directly on
building LAN & BMS workstation to avoid Supervisory
controller limitations.
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Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =
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