This conference paper discusses four well-documented definitions of net-zero energy: net-zero site energy, net-zero source energy, net-zero energy costs, and net-zero energy emissions, along with pluses and minuses of each.
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This paper describes how net-zero energy buildings will produce, during a typical year, enough renewable energy to offset the energy they consume from the grid.
This is the eighth in a series of white papers from Building Design+Construction magazine on the green building movement. It includes contributions from several sources, and focuses on zero and net-zero energy buildings and homes.
This paper introduces a classification system for net-zero energy buildings (ZEB) based on the renewable sources a building uses.
Case study about how the U.S. General Services Administration successfully renovated the historic Wayne N. Aspinall Federal Building and U.S. Courthouse. GSA’s goals were to preserve the building’s historic features, and achieve Zero Energy Building status. This case study provides an overview of how reducing plug load energy helped achieve the Zero Energy Building status.
The U.S. Department of Energy’s National Renewable Energy Laboratory is devising a new design-build project delivery model for fast-tracked, net-zero energy building. The process is progressive, performance-based design-build.
Low energy or high-performance buildings form a vital component in the sustainable future of building design and construction. Rigorous integrated daylighting design and simulation will be critical to their success as energy efficiency becomes a requirement, because electric lighting usually represents a large fraction of the energy consumed. We present the process and tools used to design the lighting systems in the newest building at the National Renewable Energy Laboratory (NREL), the Research Support Facility (RSF). Daylighting had to be integrated with the electric lighting, as low energy use (50% below ASHRAE 90.1-2004) and the LEED daylight credit were contractually required, with a reach goal of being a net-zero energy building (NZEB). The oft-ignored disconnect between lighting simulation and whole-building energy use simulation had to be addressed, as ultimately all simulation efforts had to translate to energy use intensity predictions, design responses, and preconstruction substantiation of the design. We present preliminary data from the postoccupancy monitoring efforts with an eye toward the current efficacy of energy and lighting simulation methodologies.
This paper illustrates the challenges of integrating rigorous daylight and electric lighting simulation data with whole-building energy models, and defends the need for such integration in order to achieve aggressive energy savings in building designs. Through a case study example, we examine the ways daylighting – and daylighting simulation – drove the design of a large net-zero energy project.
A presentation on a definition framework for Net Zero Energy given at the NASA Net-Zero Energy workshop June 5-6, 2012.
Presentation slides from "A Definition Framework for Net Zero Energy" presentation given at the NASA Net-Zero Energy workshop June 5-6, 2012.