Experiments to Maximize the Use of Ductless Mini- Splits ...
PNNL-29531
Experiments to Maximize the Use of Ductless MiniSplits in Homes with Existing Central or Zonal Heating and Cooling Equipment
May 2020
Travis Ashley Cheryn E. Metzger Jaime T. Kolln Greg Sullivan
Prepared for the U.S. Department of Energy under Contract DE-AC05-76RL01830
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PNNL-29531
Experiments to Maximize the Use of Ductless Mini-Splits in Homes with Existing Central or Zonal Heating and Cooling Equipment
May 2020
Travis Ashley Cheryn E. Metzger Jaime T. Kolln Greg Sullivan
Prepared for the U.S. Department of Energy under Contract DE-AC05-76RL01830
Pacific Northwest National Laboratory Richland, Washington 99354
PNNL-29531
Abstract
In residential retrofit applications, ductless mini-split heat pumps (DHP) offer the potential for high-energy savings, depending on the system they are supplementing or replacing. However, of late, there have been a number of field studies indicating these energy savings are not being achieved, due to the interaction with existing HVAC systems. The primary goal of this project is to determine a cost effective (lowest cost for the most energy saved) and persistent (e.g. automated, hard to change, etc.) solution for controlling a ductless heat pump in a home with an existing central or zonal HVAC system. Various control strategies were evaluated at the Pacific Northwest National Laboratory Lab Homes in order to examine their energy savings and thermal comfort potential.
Abstract
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PNNL-29531
Acknowledgments
The authors would like to thank Silicon Valley Power (specifically, Mary Medeiros McEnroe), the American Public Power Association, the Northwest Energy Efficiency Alliance, especially the leadership of Christopher Dymond, the Bonneville Power Administration and the New York State Research and Development Authority for their support for this project and important topic. The project team appreciates the equipment donation by Mitsubishi Electric and the support of Sam Beeson, who ensured that our team had all our questions answered quickly throughout this project. This project would not be possible without the hard work of Michael Baechler, Graham Parker and Subrato Chandra who developed the concept and saw through the execution of the PNNL Lab Homes, located in Richland, WA. The authors would also like to thank Tom Eckhart for his knowledge and support of the use of ductless mini-splits as a retrofit option. Lastly, the authors would like to thank Sam Rosenburg, Eric Martin, Robert Weber, Michael Baechler, Walter Hunt, Janice Peterson and the entire advisory committee for their thorough review of this project and report.
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