I am on the team that did the Retrocommissioning project in 2018 and I would be happy to share some of our knowledge from that process.  Below is the link to a presentation of that project that we took to a Big Ten energy conference.   Some of our main takeaways are that the combination of chilled beams, dual HX wheels, coil sizing, occupancy ventilation, and thoughtful building pressurization have led to one of the most efficient buildings on campus.  Also, the heat pumps work well to heat/cool with electricity, but would be optimal if there were more of a reheat load, or a hot water loop to send reject heat to a neighboring building in summer, which campus is looking into in certain locations. 

https://www.fs.illinois.edu/services/utilities-energy/energy-conservation/rcx-energy-results

https://webtest2.fs.illinois.edu/docs/default-source/retro/big10-friends-mechanical-energy-conference-2018-09-30.pdf?sfvrsn=7a85cbea_2

Andy Robinson, LEED-AP, CEM

DDC Specialist, F&S Energy Services - RCx