Commercial Boiler Control Tune-Ups
Russ Landry, P.E.
The project team is assessing the boiler optimization service market and planning for field monitoring. To do this they held meetings and phone interviews with professionals from 13 local organizations. Currently they are analyzing data from the State of Minnesota, Department of Labor and Industry, and a major gas utility, while investigating approaches to monitor gas savings at 20 test sites. Read the full update.
Why this research is needed
Commercial boiler tune-up programs currently provide about 8% of total portfolio savings for natural gas utilities in Minnesota. CIP boiler tune-up programs have primarily achieved savings through burner air-fuel ratio adjustments and have not explicitly addressed adjustments to boiler temperature and staging controls. A recent CARD-funded study of commercial condensing boilers found that adjustment of boiler control settings can provide substantially more savings than traditional burner tune-ups. Boiler temperature and staging/modulation control adjustments were projected to provide more than three times the savings of burner tune-up adjustments. With the increasing dominance of high-efficiency condensing boilers in new construction and boiler replacement situations, expanding the scope of boiler tune-ups to include control optimization provides an important opportunity to update programs and increase their savings per participant. This project will quantify actual savings achieved through such control adjustments for condensing boilers.
Project process and expected outcomes
This project will develop and field test an expanded scope commercial boiler tune-up protocol that goes beyond burner adjustments, to provide a comprehensive review of adjustments to boiler control settings that increase energy savings. A protocol for performing commercial boiler control tune-ups will involve collaboration with a number of industry professionals. Field tests will be conducted in approximately 20 buildings to evaluate costs, savings, operations, persistence, and market and implementation issues. This will provide information that utilities can use to plan CIP program additions or modifications that achieve more boiler “tune-up” savings towards their 1.5 percent savings goal, and can be used to add boiler control adjustment measure(s) to the Technical Resource Manual (TRM).
This project is supported by a grant from the Minnesota Department of Commerce, Division of Energy Resources through the Conservation Applied Research and Development (CARD) program, which is funded by Minnesota ratepayers.