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iPower: An Energy Conservation System for Intelligent Buildings by Wireless Sensor Networks

iPower: An Energy Conservation System for Intelligent Buildings by Wireless Sensor Networks. Yu-Chee Tseng, You-Chiun Wang, and Lun-Wu Yeh Department of Computer Science National Chiao-Tung University {yctseng, wangyc, lwyeh}@cs.nctu.edu.tw. Outline. Introduction iPower System

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iPower: An Energy Conservation System for Intelligent Buildings by Wireless Sensor Networks

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  1. iPower: An Energy Conservation System for Intelligent Buildings by Wireless Sensor Networks Yu-Chee Tseng, You-Chiun Wang, and Lun-Wu Yeh Department of Computer Science National Chiao-Tung University {yctseng, wangyc, lwyeh}@cs.nctu.edu.tw ICS-2006

  2. Outline • Introduction • iPower System • System Architecture • Energy Conservation Scenario • Message Flows in the iPower System • Personalized Services and User Profiles • Protocol Stack • Implementation of iPower System • Conclusions ICS-2006

  3. Introduction • According to statistics • more than 1/3 of energy consumption is spent on HVAC systems, which include heating, ventilating, air conditioning, and other related equipments. • Energy saving • exploit the context information of an environment to automatically control the usage of electric appliances ICS-2006

  4. iPower System • iPower (intelligent and personalized energy-conservation system by wireless sensor networks) system • reduce energy consumption of HVAC systems by exploiting the context-aware capability of sensors • provide personalized services in which electric appliances can be automatically adjusted to satisfy users’ preferences. ICS-2006

  5. System architecture Sensor nodes Form a multi-hop WSN to collect information in the environment WSN gateways Four major functionalities gathering data from nodes of the WSN reporting the room’s condition to the control server issuing commands to nodes of the WSN maintaining the WSN periodically broadcast heart-beat messages to the WSN sensor node will reply an alive message to the WSN gateway System Architecture (1/2) ICS-2006

  6. System architecture Control server collect the system’s status make a smart decision to control electric appliance devices perform power-saving decisions Power-line control devices turn on/off or adjust the electric appliances User identification devices portable devices that can be carried by users so that the system can determine users’ IDs and retrieve their profiles System Architecture (2/2) ICS-2006

  7. Energy Conservation Scenarios • Room C: Electric appliances are turned on and somebody is in the room • normal state • AC is on and somebody is in the room • the person doesn’t carry on a user identification device • server will send a alarm message to room A • 1) alarm message • 2) user intentional behavior • making some noise by clapping • covering any sensor with a light sensor to change its light reading • 3) system will cancel turning off electric appliances • 4) after 2k minutes, go back to step1 • Room A: Electric appliances are turned on but nobody is in the room. • abnormal state • AC is on but nobody in the room • Electricity is wasted • no user identification device is detected • server will send a alarm message to room A • alarm message • trigger the beeper on sensor nodes • beeps imply that the system will turn off electric appliances • after k minutes, system will turn off electric appliances normal state normal state abnormal Energy Saving • Room D: Electric appliances and smart furniture • when to turn on a lamp • pressure sensor detects a person • the sensor on the chair is nearby the sensor on the lamp (in communication distance) • when to turn off a lamp • pressure sensor detects no person • lamp is on • Room E: Electric appliances are turned off. • normal state • AC is off • no one in the room smart desk normal state • Room B: Electric appliances are turned on and somebody is in the room • normal state • AC is on and somebody is in the room • the person carries on a user identification device • system detects someone in the room • no action will be taken p pressure sensor ICS-2006

  8. Message Flows in the iPower System ICS-2006

  9. Personalized Services Electric appliances can be automatically adjusted to satisfy users’ preference Create a profile in the server’s database to record users’ preference User should carry a identification device Personalized Services and User Profiles An example of user profile. ICS-2006

  10. User layer Service layer Profile layer Sensor layer Actuator layer Protocol Stack ICS-2006

  11. Hardware devices MICAz mote X10 devices User Interface Monitor area Configure area Attribute area Implementation of iPower System configure area monitor area attribute area ICS-2006

  12. Conclusion • iPower System • energy conservation in an intelligent building • provide personalized services • automatically adjust electric appliances to users’ preference • avoid unnecessary electricity consumption of the HVAC system • turn off the unnecessary electric appliances • achieve energy conservation ICS-2006

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