Abstract
This article discusses the concept of Life Cycle Net Zero Energy Buildings (LC-NZEBs) and ways to achieve them in practice. Topics covered include: the evolution and various definitions of NZEBs, the achievement of NZEBs through building codes, the definition of LC-NZEBs, and the challenges for designing LC-NZEBs. These challenges include misconception about the significance of embodied energy, the issue of variations in LCA results, reluctance from industry for including embodied energy, absence of comprehensive design guidelines, and the lack of dynamic tools and databases for analyzing LC-NZEBs performance. To overcome the challenges, two main pathways to achieving LC-NZEBs are presented. The first one is a bottom-up approach that deals with building designers and users, while the second is a top-down approach through the development and implementation of policies that regulate energy usage in buildings.
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