1. Conclusion This study involves the development of a procedure to measure the actual energy performance of a building: the Dwelling Energy Measurement Procedure (DEMP.) The procedure utilises the latest in wireless sensor technology and is architected so that any dwelling type can be measured. The procedure should yield more accurate results than the current paper based assessment procedure by incorporating a greater range of parameters including as-built workmanship and maintenance levels. In addition, the procedure can inform the owner/occupier of the thermal characteristics of the building at key locations. Finally, the study shows Zigbee IEEE 802.15.4 to be a reliable platform upon which to base the procedure in terms of stability, flexibility and scalability. Aim To develop a method to measure the actual energy performance of a dwelling and generate a figure of merit that equates to the BER. To implement and test Zigbee wireless sensor networks in a domestic environment and determine the optimum network architecture. To develop method that facilitate the measurement, storage and analysis of data from around the building and surrounding environment. To rate the thermal conditions at key locations within the building. Abstract Abstract – This study presents a building energy measurement procedure utilising wireless sensor networks. It is presented as an alternative to the Dwelling Energy Assessment Procedure (DEAP) as it yields the actual energy performance of the building taking into account not only the design and materials used but the standards of workmanship and maintenance applied. Introduction In this study, it has been identified that there is a wealth of inefficient existing buildings with regard to energy performance. The dwelling energy assessment procedure (DEAP) is the only legislative method of assessing the energy performance of a residential building in Ireland. However, it is recognised that the accuracy of the procedure is limited. It does not take into account the actual conditions of the building being assessed: considering only the design criteria. Recent advances in wireless sensor networks enable the development of procedures that measure the energy performance of a building. Such measurements incorporate not only the design criteria but also parameters such as the standards of materials used, workmanship applied and maintenance records. The procedure developed and tested in this study measures the actual energy performance and provides a building energy audit of the dwelling through the utilisation of Zigbee wireless sensor networks. The Dwelling Energy Measurement Procedure (DEMP) provides feedback to the occupant as to how the building is performing so they can make informative decisions. The end result is a method which measures building energy performance by incorporating an autonomous wireless sensor network and a high level of human interaction to produce a more sustainable dwelling.. Abstract Abstract – This study presents a building energy measurement procedure utilising wireless sensor networks. It is presented as an alternative to the Dwelling Energy Assessment Procedure (DEAP) as it yields the actual energy performance of the building taking into account not only the design and materials used but the standards of workmanship and maintenance applied. Introduction In this study, it has been identified that there is a wealth of inefficient existing buildings with regard to energy performance. The dwelling energy assessment procedure (DEAP) is the only legislative method of assessing the energy performance of a residential building in Ireland. However, it is recognised that the accuracy of the procedure is limited. It does not take into account the actual conditions of the building being assessed: considering only the design criteria. Recent advances in wireless sensor networks enable the development of procedures that measure the energy performance of a building. Such measurements incorporate not only the design criteria but also parameters such as the standards of materials used, workmanship applied and maintenance records. The procedure developed and tested in this study measures the actual energy performance and provides a building energy audit of the dwelling through the utilisation of Zigbee wireless sensor networks. The Dwelling Energy Measurement Procedure (DEMP) provides feedback to the occupant as to how the building is performing so they can make informative decisions. The end result is a method which measures building energy performance by incorporating an autonomous wireless sensor network and a high level of human interaction to produce a more sustainable dwelling.. Method  A number of different residential buildings were identified as case studies for the investigation. Buildings were selected based on variations in design and as-build criteria.  A Zigbee network has been placed in each building and a range of architectural layouts are being tested.  A number of sensors have been positioned inside and outside the building: each measuring its local thermal conditions and periodically reporting the data back to a central hub for storage and analysis.  We are currently implementing a wide range of experiments under controlled conditions. The results are being analysed to determine the actual performance of the building and to determine useful metrics for a figure of merit. Zigbee Dwelling Energy Measurement Procedure (DEMP) Brendan E. Hoare and Dr. Colm V. Cryan Civil Engineering and Material Science Department University of Limerick Fig.2. Zigbee Mesh Topology used throughout the study. Fig.1. Information flow Schematic. Illustrating the Dwelling Energy Measurement Procedure ( DEMP)Process Fig 3. Temperature vs. Time Graph 1. Fig 4. Temperature vs. Time Graph 2. Acknowledgements I wish to acknowledge Dr. Colm V.Cryan, and the Civil Engineering and Material Science Department for there support throughout this study. Zigbee (IEEE 802.15.4) is an emerging wireless technology standard, developed by the Zigbee Alliance. The standard is designed to provide low-cost, low power, personal area networks. The standard can support up to 65,000 nodes operating at up to 250 kbps. In this study star and mesh network topologies are being explored and the network characteristics and capabilities of each configuration is being determined. The figures presented show preliminary results from implementation of the Dwelling Energy Measurement Procedure (DEMP.) The results show that using currently available technology, it is possible to identify areas within a building with different thermal responses. We are currently working to correlate the measured data with the parameters influencing performance such as; Floor area Building Orientation Surface Area Ventillation Volume Glazed Area Heating System (radiator area) The next step is to establish the figure of merit. Results