h1. Building Energy Optimization

h2. Project Description

The Building Energy Optimization System is a sensor network consisting of several power and environmental sensors to monitor and understand energy usage patterns with the objective of giving the user feedback on reducing the energy consumption.

h2. System Components

!Energy_Sensor_Network4.jpg!

The Three-phase energy meter is used to measure the aggregate energy consumption of all appliances. Each plug-through power meter measures the energy of an individual appliance. Every electromagnetic-field based (EMF) energy sensor is placed in the proximity of an appliance, and detects the state change when the appliance turns on or off. The environmental sensors measure the ambient light, temperature, audio, pressure, acceleration and humidity and detect human motion in the proximity. The thermal scanner is mounted on the ceiling and generates a thermal map upon scanning the entire room. The thermal and the environmental sensors data can be correlated with the per-appliance energy consumption and can give useful information on usage patterns, and can also help detect building and appliance faults.

Each of the sensors are described briefly below:

# *Environmental sensors*

The figure below shows the environment sensing board with all its sensors labeled.

!ff3-env-sensor.jpg!

# *Thermal Scanner*

** Low-Cost Thermal Scanner

** Distributed Scanning

** 3D model construction

!Thermal-scanner.jpg! !Thermal-scanner-3D.jpg!

# *Three-phase energy meter*

** 3-Phase Circuit Panel Meter (110-240VAC)

** RMS Current, RMS Voltage, True Power, Apparent Power, Reactive Power, Power Factor

** 2KHz Output Rate

** 1W resolution with 20KW max load

** Local processing support asynchronous pushing of power events on change

!3phase-meter.jpg! !3phase-bottom.jpg!

(Details of the current and voltage connections to the meter are present in pdf at the end of this page)

# *Plug-through energy meter*

** 1 outlet (110-240VAC)

** Mechanical relay switching

** RMS Current, RMS Voltage, True Power, Apparent Power, Reactive Power, Power Factor

** 2KHz Sampling Rate

** 1W resolution with 1700W max load

** Local processing support asynchronous pushing of power events on change

!plug-front.jpg! 

# *Electromagnetic-field (EMF) sensor*

** Contact-less sensing of current

** Automatic gain adjustment every 100ms

** Transmits gain value to indicate strength of measured field

!emf-sensor.jpg!