News & Updates

This report summarizes the performance of the 15-ton Daikin Rebel dual fuel heat pump rooftop units (RTUs) RTU2F and RTU3F serving the back zones of 47-01 Queens Blvd, Sunnyside, NY 11104. The performance of these heat pump RTUs was characterized in terms of operating modes, delivered sensible capacity, efficiency, energy inputs, and emissions.

This report provides an analysis of energy and bill savings achievable through the use of dual fuel heat pump RTUs and energy recovery ventilators (ERVs) in Minnesota’s commercial buildings. 

This study sought to determine market barriers to implementing retrofit technologies available for packaged rooftop units (RTUs) and determine ways to overcome them. 

Packaged roof-top units (RTUs) are ubiquitous on commercial buildings throughout the United States because of their low capital cost, reliability and well-developed service and distribution network. There is anecdotal evidence, however, that these systems tend to operate inefficiently and sub-optimally. To validate or refute this evidence, we conducted a multi-level field study to characterize the RTUs in Minnesota.

This project investigated the expectations and the operating performance of ERV units in Minnesota commercial and institutional buildings. The project team used available data to characterize commercial and institutional ERVs in Minnesota and then monitored the performance of representative ERV systems, identified and rectified problems that diminish ERV performance, and documented the energy use and costs associated with under-performing ERVs.