Background Source: Cisco Typical Building Lifecycle (Cisco, 2005) –More than 75% of Expenses occur...
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Transcript of Background Source: Cisco Typical Building Lifecycle (Cisco, 2005) –More than 75% of Expenses occur...
Background
Source: Cisco
• Typical Building Lifecycle (Cisco, 2005)– More than 75% of Expenses occur in the Operating Period
– But most of the time and focus are in the development period
• Building energy systems do not operate as developed– 15~30% of energy is wasted (Katipamula and Brambley, 2005)
– Up to 70% of the service costs can be saved (Li and Braun, 2007)
• Smart Bldg solutions: Automated monitoring, diagnostics and optimization– Wireless sensor network based monitoring is one of the enablers
Example Technology: Cascade VAV Optimal Control Strategy Using WSN and AFDD
Duct work
FanTerminal boxes: 1, 2,…i,…n
VFD Controller
Static Pressure Controller
-+
DP/Load analyzer
Damper position of the critical zone
Wireless Sensor
Network
100%rDP ,s rP sP DPs
-+
Automated Fault Diag.
• Optimal VAV control strategy is to maintain the damper associated with the critical zone fully open– Primary control loop: Reset the static pressure set point (SPSP)
– Secondary control loop: Modulate fan speed to meet the SPSP
– WSN: obtain all damper positions -- AFDD: Diagnosis on system functionality
– DP/Load analyzer: Identify the critical zone
Preliminary Results
The optimal VAV control strategy (damper position rest) using WSN can save more energy than the other two existing methods while ensuring comfort
Comfort can not be met from 8~10 due to deficiency of supply air if either airflow rate reset or OA temperature reset method is used
Testing Bed Development
CEEN WSN Lab
AE Intelligent Bldg. Syst. Lab
Establishment of the UNL Smart Building Center
NCERS
Yr1:$62,946Yr2:$65,254
Sensus M.I.
Yr1: $56,640Yr2: $60,000
Indus Sponsors
Target: $128,517
$upport Technol Transfer
$upport
Underground: $10k