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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.

Publish Date: January, 2008

NBI conducted lab and field technical assessments of eight Desert CoolAire prototype indirect evaporative air conditioners on behalf of Northwest Energy Efficiency Alliance and Sacramento Municiple Utility District. This addendum includes additional information about monitoring and equipment status. Also see the Final Report on the original 2006 research.

ARTU Cost Benefit Analysis (147.87 KB PDF)
Publish Date: August, 2007

This document presents an analysis of the costs and benefits associated with the features of an advanced rooftop unit (ARTU). These features were identified in the “ARTU Product Definition Report” (AEC 2005).

This project is part of a California Energy Commission program within the Public Interest Energy Research program (PIER) and known as the “Advanced Automated HVAC Fault Detection and Diagnostics Commercialization Program” (FDD program).

Publish Date: July, 2007

NBI conducted lab and field technical assessments of eight Desert CoolAire prototype indirect evaporative air conditioners on behalf of Northwest Energy Efficiency Alliance and Sacramento Municiple Utility District. Also see the 2007 Addendum with additional monitoring and equipment status.

Publish Date: July, 2007

This field test consisted of site and AC selection, installation and replacement, performance monitoring, and data analysis. Standard baseline SEER 13 air conditioners were first monitored and then replaced with HDACs. Monitoring of the baseline and HDAC units were completed during the summer of 2006.

The PIER program commissioned a project to promote air conditioners specifically selected to perform well at hot dry conditions. Pacific Gas and Electric Company, Southern California Edison, and Nevada Power commissioned this field test.

Publish Date: April, 2007

In March 2007, New Buildings Institute (NBI) hosted and facilitated the Getting to 50 Summit. This meeting of 60 experts was initiated to develop relationships and strategies which will significantly and rapidly reduce energy use in new and renovated commercial buildings. Getting to 50 (GT50) refers to the Energy Policy Act of 2005 (EPACT 2005), which provides tax incentives for buildings that are designed to use 50 percent or less of the energy of typical code buildings (ASHRAE 90.1-2001).

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