1) WattDepot: A software ecosystem for energy data collection, storage, analysis, and visualization Robert S. Brewer, Philip M. Johnson Collaborative Software Development Laboratory Information and Computer Sciences Dept University of Hawaii at Manoa http://csdl.ics.hawaii.edu/
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WattDepot: A software ecosystem for energy data collection, storage, analysis, and visualization
WattDepot is an open source, Internet-based, service-oriented framework for collection, storage, analysis, and visualization of energy data. WattDepot differs from other energy management solutions in one or more of the following ways: it is not tied to any specific metering technology; it provides high-level support for meter aggregation and data interpolation; it can provide near-real time data collection and feedback; and the software is open source and freely available.
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WattDepot:A software ecosystem for
energy data collection, storage, analysis, and
visualization
Robert S. Brewer, Philip M. JohnsonCollaborative Software Development
Laboratory Information and Computer Sciences Dept
University of Hawaii at Manoahttp://csdl.ics.hawaii.edu/
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Motivation Research on changing energy use behaviors• Need to collect & analyze energy data
Requirements• Collect data from many meters• Sub-minute data collection• Easy to simulate sensor data• Internet-accessible repository• Visualization variety & flexibility• Open source
Could not find an existing solution• Developed WattDepot
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Architecture
Devices MetersWattDepotSensors
WattDepotServer
WattDepotClients
HTTP HTT
P
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Sensors Software to collect data• Interface to specific meters• Store data in server via HTTP
Designed for flexibility• Encapsulates vendor-specific code• Any platform or language• Just needs to output XML over HTTP
Current implementations• TED 5000 home energy meter• Veris power meters• Modbus/TCP meters
Sensors
Server
Clients
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Servers Central data repository• RESTful HTTP API• Pluggable back-end database• Data represented as XML or JSON• Devices represented as Sources
Server-side capabilities• Aggregation of sources (virtual sources)• Data interpolation
Sensors
Server
Clients
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Servers: Virtual Sources Virtual sources combine sub-sources• Maps real-world entities to system• Hierarchy can be multi-level
But meter clocks may not be synchronized
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Servers: Timestamp Problem Unsynchronized clocks cause problems• Naïve data comparison difficult
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Servers: Data Interpolation Data resampling at arbitrary times• Linearly interpolate between data points• Solves timestamp problem for virtual sources
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Clients Data extraction & visualization• Any platform or language• Using REST or Google Visualization APIs
Current implementations• Real-time monitors• Charts• Geographic visualizations• Android mobile application• All independent of data input source
Sensors
Server
Clients
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Clients: Heatmap and Gauge
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Clients: GeoMap
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Related Systems Pachube• Commercial hosted data storage• YouTube for sensor data• Limits on rate of data storage• Arbitrary data means no energy “smarts”
Google PowerMeter• Smart meter data storage & visualization• Data limited to 15 min intervals• Focus on single-family homes
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Our Application Dorm energy competition• 30 floor-level meters• Real-time data
Extensive competition web app• Customized goal-based visualizations
Google Spreadsheet intermediary• High performance “cloud cache”• Build higher-level data abstractions• Easy to prototype visualizations
Simulated energy data critical• Allows progress while meters are installed
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Dorm Energy Visualizations
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Future Directions Privacy• Sources currently public or private• Limited authentication support• All current applications use public data
Data aggregation• Needed when comparing private data
Sensors• Additional meter support
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System Availability Hosted on Google Code• http://code.google.com/p/wattdepot/• Open source under New BSD license