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Publish Date: August, 2009

Green building program energy efficiency strategies often use integrated design, precluding the measurement of results simply from deemed savings of specific measures. This paper describes the use of whole-building measured energy use, by month and fuel, to evaluate the achievements of high performance building programs at both the individual building and program level.

Publish Date: July, 2009

Under a project for the U.S. Environmental Protection Agency, NBI researched trends and new technologies in advanced metering as used in energy information systems (EIS).

Publish Date: March, 2009

This research is part of an effort to develop a reliable commercial rooftop unitary (RTU) field service/repair (also known as “retrocommissioning”) protocol, along with a higher level of confidence in the associated energy savings necessary to justify RTU service programs. This report documents the results of the Phase 2 project.

Publish Date: February, 2009

This white paper, also known as "My Car Is Smarter Than Your Building," looks at the lessons controls-savvy cars can teach us about how high performance and enlightened controls standards can lead to more energy efficient buildings.

Publish Date: October, 2008

This specification is proposed for commercial packaged rooftop units equal to or smaller than 135,000 Btu/h. It is intended to improve in-field energy performance for customers and utilities by increasing reliability, maintainability and performance/conditioning monitoring including advanced fault detection.

Publish Date: August, 2008

This paper presents a study of whole building energy use of various completed LEED buildings throughout the nation. The paper focuses on the relationships between predicted and actual energy performance of 90 completed LEED certified buildings. The results of the study impact the ongoing discussion on how design industry can act in response to the Architecture 2030 challenge along with other carbon reduction goals.

Presented at the 2008 ACEEE Summer Study on Energy Efficiency in Buildings.

Publish Date: August, 2008

Is LEED delivering actual energy savings? This study addresses that question with a post-occupancy assessment of 121 LEED buildings across the country. Input to the study consisted of energy bills and brief descriptions of actual building use from owners, plus modeled energy usage information from the USGBC’s LEED submittal files. The actual building performance was viewed through several whole-building metrics: energy use intensity (EUI) relative to national averages, Energy Star ratings, and energy use levels relative to the initial ASHRAE 90.1 modeling.

Presented at the 2008 ACEEE Summer Study on Energy Efficiency in Buildings.

Publish Date: June, 2008

This work has been done as part of the Commercial Rooftop HVAC Energy Savings Research Program which includes four interdependent elements: 1) bench testing of economizer controls, 2) field testing of repair protocols, 3) devising an appropriate measurement and verification (M&V) approach and 4) developing a savings prediction methodology based on prototypical buildings. Taken together, these elements are intended to lead to the development of a reliable field repair protocol with a higher level of confidence in the associated energy savings. This document summarizes the results of only the first of the four elements, the bench testing of economizer controls.

Publish Date: March, 2008

NBI has completed the broadest study to-date of measured energy performance of LEED buildings called “Energy Performance of LEED for New Construction Buildings.” Aimed at better quantifying the actual energy performance levels of green building, the study gathered whole building energy data from 121 LEED-NC buildings across the country that had been occupied for at least one year. The results look at the relationships of actual performance levels to other benchmarks, including initial modeling and ENERGY STAR ratings.

Also, view Frequently Asked Questions about the study.

Publish Date: March, 2008

This report is a secondary research project examining data available on pilot and operating rooftop unit (RTU) retrofit programs around the country at the time and summarizes a variety of information on the topic. Included are discussions of technical issues, program operational strategies, market penetration and evaluation findings. This material was used as part of a review of the design and performance of existing HVAC program activities and helped inform the development of an expanded RTU program effort in the Northeast.