Ongoing energy performance: ratings and savings for existing buildings

Panel: 5B. Cutting the energy use of buildings: Policy and programmes

This is a peer-reviewed paper.

Authors:
Jason Steinbock, The Weidt Group, USA
David Eijadi, The Weidt Group, USA
Ryan Schwartz, The Weidt Group, USA
Chris Baker, The Weidt Group, USA

Abstract

Utilities in the United States are now helping customers find additional energy savings opportunities by leveraging the relationships and energy models created as part of earlier energy design assistance programs. A process currently being piloted by one utility and considered by others called Ongoing Performance helps re-optimize building operations that drift from original behaviors for a variety of reasons. It also helps fined new savings based on changes in technologies and business operations.

Candidate projects are targeted using quick benchmarking methodologies. In this way, rate payer dollars are spent first on the buildings with the greatest opportunity for savings. Using utility billing information, actual building performance is benchmarked against the expected performance from the pre-construction, design energy models that were created as part of utility sponsored programs. If the meter usage shows 20% or more energy use than the model, potential exists for cost effective energy savings opportunities in operations.

The original Baseline and Proposed energy models are updated to reflect the current operation of the building. These updates use the utility billing information and ASHRAE Level I auditing techniques. The updated models account for changes in occupancy, weather and even space usage since the design period. Current savings for the original energy efficiency investment are then calculated, but the real power lies in using an Actualized Building Model to help the building owner, operator and utilities understand the new potential energy savings opportunities in the existing building.

Customers have been excited participants in the initial pilots and significant energy savings in both low cost operational adjustments and future capitol planning have been found and are in the process of being implemented. This paper will detail the process and provide case study examples of completed projects.