A case study of the overview, process, and results of the re-tuning that was conducted in a building in Arlington, Virginia by Vornado Realty Trust in October 2012. Re-tuning provided the facilities management team with the ability to identify and understand building scheduling opportunities that drove significant, low-cost energy savings. Five measures were conducted, many of which pertained to the HVAC system.
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Case study describing how adidas implemented a best practice of a planned replacement program for its rooftop units (RTUs), which resulted in significant cost and energy savings. The case study outlines the planning process, implementation, results, and the future plans of their RTU replacement program.
The lack of empirical data on the energy performance of buildings is a key barrier to accelerating the energy efficiency retrofit market. The DOE’s Buildings Performance Database (BPD) helps address this gap by allowing users to perform exploratory analyses on an anonymous dataset of hundreds of thousands of commercial and residential buildings. These analyses enable market actors to assess energy efficiency opportunities, forecast project performance, and quantify performance risk using empirical building data. In this paper, we describe the process of collecting and preparing data for the database, and present a peer-group analysis tool that allows users to analyze building performance for narrowly defined subsets of the database, or peer groups. We use this tool to explore a case study of a multifamily portfolio owner comparing his buildings’ performance to the peer group of multifamily buildings in the local metro area. We also present a performance comparison tool that uses statistical methods to estimate the expected change in energy performance due to changes in building-component technologies. We demonstrate a low-effort retrofit analysis, providing a probabilistic estimate of energy savings for a sample building retrofit. The key advantages of this approach compared to conventional engineering models are that it provides probabilistic risk analysis based on actual
measured data and can significantly reduce transaction costs for predicting savings across a portfolio.
While the availability of “big data” about building energy performance is increasing in response to market demands and public policies, the lack of standard data formats is a significant ongoing barrier to its full utilization. To overcome this barrier, the U.S. Department of Energy (DOE) and Lawrence Berkeley National Laboratory (LBNL) developed the Building Energy Data Exchange Specification (BEDES).
BEDES is designed to enable the exchange, comparison, and combination of empirical information by providing common terms and definitions for data about commercial and residential building’s physical and operational characteristics, energy use, and efficiency measures.
This paper describes the BEDES development process, scope, structure, and plans for implementation and ongoing updates.
This case study describes a successful zero energy school project in Utah.
The Sacred Heart Academy Library is part of the Sacred Heart School's Lower and Middle School campus. The library is intended as an educational demonstration of the school's goal "to teach students to be stewards of the earth's resources." The library has achieved zero energy while meeting a very modest construction budget - in fact, all Zero Energy features, including photovoltaic panels, were included within the already established budget.
Richardsville Elementary School is the first full-scale zero energy K-12 school in the United States. The school building, located in Kentucky's Warren County Public School District, uses many innovative strategies to conserve energy including dedicated outdoor air systems (DOAS) with dynamic reset, insulated concrete form (ICF) wall construction, daylighting, and ground source heat pumps, among others. The school has both thin film and crystalline silicon photovoltaic panels.
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.
These are the appendices to the report "Rebuilding Greensburg, Kansas, as a Model Green Community: A Case Study on NREL’s Technical Assistance to Greensburg June 2007 – May 2009".
In order to seize the opportunities for improving energy performance in the United States, it is important to understand what drives American companies and building owners to adopt efficiency improvements and sustainability policies. The research in this report provides new insights on how to create high-performing buildings and how to make the right business case to seize these opportunities.