Building Management Systems

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  • Topic: Heating, ventilating, and air conditioning, HVAC, Building automation
  • Pages : 8 (1683 words )
  • Download(s) : 619
  • Published : December 9, 2010
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Contents:

Pages

1. Project details.03

2. Sensors and actuators used.05

3. Details on controllers/DDC used in the project.17

4. Software, GUI, and communication protocols.25

5. Drawbacks of the overall system.25

6. Discussion.25

BUILDING AUTOMATION SYSTEM PROJECT- ADMINISTRATION BUILDING OF TRELLEBORG LANKA (PVT) LTD

1.0 PROJECT DETAILS

A Building Management System (BMS) is a computer-based control system installed in buildings that controls and monitors the building’s mechanical and electrical equipment such as ventilation, lighting, power systems, fire systems, and security systems. A BMS consists of software and hardware; the software program, usually configured in a hierarchical manner, can be proprietary, using such protocols as C-bus, Profibus, and so on. Vendors are also producing BMS's that integrate using Internet protocols and open standards such as DeviceNet, SOAP, XML, BACnet and Modbus.

A BMS is most common in a large building. Its core function is to manage the environment within the building and may control temperature, carbon dioxide levels and humidity within a building. As a core function in most BMS systems, it controls heating and cooling, manages the systems that distribute this air throughout the building (for example by operating fans or opening/closing dampers), and then locally controls the mixture of heating and cooling to achieve the desired room temperature. A secondary function sometimes is to monitor the level of human-generated CO2, mixing in outside air with waste air to increase the amount of oxygen while also minimising heat/cooling losses. Systems linked to a BMS typically represent 40% of a building's energy usage; if lighting is included, this number approaches 70%. BMS systems are a critical component to managing energy demand. Improperly configured BMS systems are believed to account for 20% of building energy usage, or approximately 8% of total energy usage in the United States. As well as controlling the building's internal environment, BMS systems are sometimes linked to access control (turnstiles and access doors controlling who is allowed access and egress to the building) or other security systems such as closed-circuit television (CCTV) and motion detectors. Fire alarm systems and elevators are also sometimes linked to a BMS, for example, if a fire is detected then the system could shut off dampers in the ventilation system to stop smoke spreading and send all the elevators to the ground floor and park them to prevent people from using them in the event of a fire.

In this report it is discussed the building management system (BMS) implemented in Administration Building of Trelleborg Lanka (Pvt) Ltd. It is a distributed control system with a computerized network of electronic devices. The BMS was setup is to control, monitor and optimize building service such as Lighting, Air conditioning, Fire security, CCTV system, etc. Main objectives were as follows. ✓ Good control of internal comfort conditions

✓ Zonal control
✓ Increased staff productivity
✓ Effective monitoring and targeting of energy consumption ✓ Effective response to HVAC-related complaints
✓ Flexibility on change of building use
✓ Central control and monitoring of building
✓ Time saving
✓ Low operating cost
✓ Efficient use of building resources and services
✓ Rapid alarm indication and fault diagnosis
Systems linked to the BMS represent 80% of a building's energy usage.

Fire alarm systems and elevators are also linked to the BMS, for example, if a fire is detected then the system could shut off dampers in the ventilation system to stop smoke spreading and send all the elevators to the ground floor and park them to prevent people from using them in the event of a fire.

The BMS comprises:

✓ Power system
✓ Lighting...
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