Presenter: Srinivas Katipamula, Pacific Northwest National Laboratory

This multiyear research and development project aims to determine the magnitude of energy savings achievable by retrofitting existing packaged rooftop air conditioner units (RTUs) with advanced control strategies not ordinarily used for packaged units. An extensive field demonstration confirmed that advanced RTU controllers can achieve heating, ventilation, and air conditioning (HVAC) energy and cost savings of more than 40% over the typical packaged air conditioners and heat pumps (with constant-speed supply fans) installed on commercial buildings. The technology saves energy by alerting owners and service providers of the need to service units, and it is suitable for use with existing and new RTUs to improve maintenance of neglected HVAC equipment. Energy savings in the project will be measured for five climate zones to provide direct, measured evidence of the benefits of this relatively low-cost technology.

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