Advanced Commercial Rooftop Units

GPG-034, April 2018

GPG, in collaboration with Pacific Northwest National Laboratory researchers, evaluated the first RTU to meet the Department of Energy's High Performance RTU Challenge. Results from measurement and verification at a warehouse in Fort Worth, Texas demonstrated energy savings of 26%. A concurrent PNNL study of high-performance RTUs at two Florida supermarkets found payback of 3.8 years. Click on the infographic below to enlarge.

GPG Findings 034, April 2018, Advanced commercial rooftop units. Opportunity: RTUs condition how
  much floor space nation-wide? >50% OF COMMERCIAL FLOOR SPACE IN
  THE U.S. IS CONDITIONED BY ROOFTOP UNITS (RTUS). Technology: How do advanced
  RTUs work? VARIABLE SPEED INVERTER
  COMPRESSOR MAINTAINS AIR
  TEMPERATURE SETPOINT. VARIABLE SPEED SUPPLY FAN RESPONDS TO ZONE CONDITIONS  Measurement and Verification: Where did M and V occur? PACIFIC NORTHWEST NATIONAL LABORATORY (PNNL) assessed the first RTU to meet the Department of Energy’s High Performance RTU Challenge2. The RTU was provided by Daikin Applied and installed in a GSA warehouse in Fort Worth, Texas. PNNL also conducted a concurrent study of the advanced RTU at two Florida supermarkets. Results: How did the advanced RTU perform in M&V? 26%
  ENERGY
  SAVINGS
  Models predicted 40%
  savings compared to a
  standard RTU. COSTS
  FOR INSTALLATION VARY
  Heavier unit and different footprint
  may require infrastructure
  reinforcement or duct changes. 3.8 YR
  PAYBACK
  demonstrated at
  two Florida
  supermarkets. Advanced RTU exceeds baseline efficiency, particularly at higher outdoor air temperatures. Deployment:Where does M&V
  recommend
  deploying advanced
  RTUs? END-OF-LIFE REPLACEMENT
  Modeling indicates that savings will be greatest in hot, humid climates. [PDF - 263 KB]


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