print page

Bachelor's Thesis

Temperature Modeling of Energy Buffers for Wireless Sensor Nodes

Energy is the most limiting factor for the lifetime of nodes in wireless sensor networks. To create a self-sustaining system, generating energy from the environment using energy harvesters is a suitable solution. Harvested energy is usually stored in an energy buffer. Among a sufficient buffer capacity, the durability and temperature stability are of highest importance to create a long-time stable energy supply. Many wireless sensor network operate outdoors and suffer from severe temperature fluctuations. Despite its aging influence on energy buffers, temperature also influences the self-discharge or the maximum current. For example most lithium based accumulators supply less current at low temperatures and cannot be charged at all below 0°C.

Aim and objectives of this thesis are to analyze the temperature dependency and create a temperature model for different energy buffer technologies. The model aims to predict available buffer energy and therefore improve lifetime-predictions for wireless sensor nodes.

Start date 17. May 2010
End date 9. August 2010
Documents Flyer
Projects EBS | SensorNet
Supervisor Jürgen Jessen
Dr.-Ing. Christian Renner