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MRI – Research Group Meeting
Intelligent Building Research – Indoor Air Quality Applications Using Wireless Sensors and Building Automation System
December 1, 2005
Chia Y. Han
Intelligent Building Research
Key Issue # 1 – Interoperability across enterprise and industry
Key Issue #2 – Open System Architecture
HVAC – Infrastructure for Indoor Air Operations
Setpoints – Meters/Sensors and Control Points
Frequency Drive Object
PID Control
Control Device
Supply Fan Variable VFD
Ref Set Point
VAV Air Handler Object
Fire & Smoke Alarm System Object
VAV Cooling Only Terminal Box
Dmpr Actuator
Control Device
FlowSensor
VAV Cooling Only Terminal Objects
Thermostat Objects
Ovrd PB
Setpt Adj
RH Sensor
Temp Sensor
Maint & Mat. Mgt. CMMS System Object
VAV Air Handler Object
Sup Air Control Loop
Control Device
Fan Static Press
Sensor
Sup Air Flow
Sensor
Ret Air Flow
Sensor
OA Flow Sensor
CO2 Sensor
System User Objects
Power Management System Object
Frequency Drive Object
PID Control
Control Device
Return Fan Variable VFD
Ref Set Point
Load Ctrl Object
Load Ctrl Object
BACnet Objects
IBS – IAQ Application
To develop a BAS system for IAQ applications that is based on open system principles, domain standards and recommended practices, rule-based expert system, and Web technologies.
The system should provide capabilities for FDD with user-defined, case-specific rules.
Case Study - Air Isolation btw 2 roomsCase Study - Air Isolation btw 2 rooms
IBS - Architecture
Web-Based IBS Implementation
Diagnosis Request in XML
Diagnosis Logic in Expert System Language
Sample Views of the BAS Technology
Technical Specification Sheet Rev. AA, October 2005
Siemens Building Technologies, Inc.
http://www.us.sbt.siemens.com/bau/products/Wireless/149944.pdf
To implement the WFLN, a Field Level Network Radio Transceiver (FLNX) is mounted at the FLN device and a Field Panel Radio Transceiver (FPX) is mounted at the field panel. Both must be powered by 24 Vac. The radio’s antenna can either be direct or remote mounted. In cases where the radio transceiver is mounted in a metal enclosure, the remote mount antenna would be used. The transceivers are plenum rated for direct mount without an enclosure. Once installed and powered, the radios automatically form the mesh network and the WFLN’s wireless mesh communication is virtually transparent to the system and end user.
Summary of IBS
BACnet standard gaining acceptance worldwide
Interoperability effort is underway in building industries
Almost all major BAS vendors are now subscribing BACnet
Wireless-based sensors and controllers are starting to become available
Very few enterprise business process/workflow is incorporating BAS
Lack of easy-to-use, user-directed IBS