Xcel Energy CASE STUDY
Mike O’Malley, embracing Xcel Energy’s commitment to sustainability excellence, found an opportunity to significantly improve chiller efficiency in the district cooling plant he manages in Denver, Colorado.
USE CASE & BACKGROUND
Mike O’Malley, embracing Xcel Energy’s commitment to sustainability excellence, utilized the Helios Tube Cleaning System to significantly improve chiller efficiency in the district cooling plant he manages in Denver, Colorado.
a single 2,500-ton chiller for a seasonal evaluation
HELIOS TUBE CLEANING SYSTEM
Chiller efficiency improved by 12%
As is so often the case, adopting innovative technology requires a high degree of evaluation and consideration regarding a new approach’s impact.
In Xcel Energy’s case, Mr. O’Malley knew there was room to improve chiller efficiency through tube fouling management. Subsequently, Mike served as the thought leader for integrating the Helios Tube Cleaning System® onto a single 2,500-ton chiller for a seasonal evaluation.
The plant has excellent data acquisition systems and in Mike’s opinion, it would be easy to determine the impact of the Helios installation over the course of a complete cooling season.
In Xcel Energy’s case, the biggest challenge was freeing capital funds to purchase a Helios TCS on a short notice. Mike O’Malley was successful
in finding a funding opportunity and was able to program in the new system.
Once funded, the evaluation was enacted. Mike understood the large potential savings and was the key leader in getting the program started.
Installed on a 2,500-ton chiller in the downtown Denver Central Cooling Plant, the Helios Tube Cleaning System® was run throughout the normal cooling season in 2018. Chiller operation and performance data was recorded from the same chiller from 2017 before it was equipped with the Helios.
As the data demonstrate, the Helios Tube Cleaning System® significantly improved chiller efficiency and increased chiller cooling output during the 2018 cooling season.
The lesson continues to be reinforced at Helios Tube Cleaning System® installations throughout the country. As previously stated, when the tubes on either side of a chiller remain clean and free of fouling, the chiller efficiency improves, and operating costs reduce. This is a generally well-known fact, but it is sometimes hard to quantify.
In Xcel Energy’s case the savings are solidified by the data and equate to a solid payback. Most organizations ask the same question, “We believe the data at the other facilities, but how much will the system save us at our organization?” The answer can usually be found by analyzing the historical chiller operations data.
Assuming the data is supplied by reliable/calibrated sensors, the approximate cost of fouling-related inefficiency can be identified. Once the data is analyzed a consistent truth is exposed. No facility using water-cooled chillers is immune from fouling-related loss. None. Until now.
While typical chiller tube-fouling losses will vary from place to place based on the quality of the water source, local air quality, and water treatment programs, the growing data collection from chillers operating with Helios systems confidently suggests a savings of 6% to 10% in energy expense at over 70% of locations. The remaining 30% is split equally with half experiencing efficiency losses above 10% and half below 6% savings opportunity.
How far below?
The lowest potential efficiency improvement in an evaluated chiller has been 3.5%. Its payback was still under 3.5 years. With the introduction of the Helios Tube Cleaning System®, the tube fouling-related waste can be completely eliminated.
XCEL ENERGY CASE
When Excel Energy tested the Helios TCS at a district cooling plant in Denver, Colorado the average chiller efficiency improved by 12%.
With a commitment to sustainability excellence, Xcel Energy utilized the Helios Tube Cleaning System to significantly improve chiller efficiency in their Denver, Colorado district cooling plant.
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