Large Building Re-tuning Resources
Researchers at the Pacific Northwest National Laboratory (PNNL) have developed a number of useful resources to help re-tune large (>100,000 sf) commercial buildings with building automation systems (BASs):
Re-tuning is a systematic semi-automated process to identify operational problems in large commercial buildings that have BASs. The process relies on the trend data collected by the BAS to identify the problems. Download the Microsoft PowerPoint® training material slides.
PNNL also developed an instructors' manual that provides additional information on what to highlight in each of the re-tuning slides. This document is useful for someone teaching a re-tuning class. Download the instructor manual.
ECAM+ is a Microsoft Excel®-based tool developed to analyze data (energy and data from building automation systems) from buildings. The tool makes extensive use of Excel® pivot tables to facilitate summarization and filtering of the data. The original development of ECAM was co-funded by the Northwest Energy Efficiency Alliance (NEEA), New Buildings Institute (NBI), and the California Energy Commission. The update to v2.0 was primarily funded through the California Energy Commission's Public Interest Energy Research (PIER) program, with additional funding from California Commissioning Collaborative (CCC) and NEEA. Version 2.0 also benefits from the incorporation of charting and functionality developed by the Pacific Northwest National Laboratory (PNNL) for their "Building Re-Tuning" Program. Learn more about the CCC version. Since v2.0, ECAM has been upgraded to ECAM+v3.0, which includes upgrades to the PNNL Re-tuning portion of ECAM, and the addition of Modeling and Verification (M&V) for meter data. This version can be downloaded by following the link to ECAM+ above, and an updated user guide can be found there also describing the recent additions included in ECAM+v3.0.
Re-tuning focuses on a number of commonly occurring operational problems in buildings. PNNL is in the process of developing a guide focused on each of the measures. These guides can be downloaded.
PNNL conducted a study to estimate, through simulation, energy savings for common re-tuning/RCx measures. The study investigates and documents savings from a set of re-tuning measures that improves the operating efficiency of large office buildings (>100,000 sf). The re-tuning measures are associated with both air- and water-side HVAC systems.
The savings were estimated using the EnergyPlus building simulation software. Eight EnergyPlus input files can be downloaded for your use. These files have an .idf extension, but can be opened in any text editor, as well as by the IDF Editor in EnergyPlus version 6.0. To use these files with other versions of EnergyPlus may require some changes. These files are representative sampling of 8 of the 864 total input files used for the simulation work that serves as the basis of the report.
Included in this sample are the input files for the baseline model, for Combination 1, Combination 2, and Combination 3. There are two versions of each of these, one for the pre-1980 vintage building prototype and one for the post-1980 vintage prototype. Each of the 8 files includes the specification of the building envelope components specific to DOE Climate Zone 5A, for which the intended city for simulation is Chicago, IL.