Murfreesboro VA Medical Center, Chiller Plant Upgrade

Modeling old distribution with new all-variable speed

Murfreesboro Veterans Administration Medical Center’s distribution system could not provide adequate cooling for their campus. Multiple buildings experienced chilled water shortfalls during high-load periods.

In collaboration with AE Works, HGA was hired to upgrade the campus chilled water system. We modeled the distribution system, including the previous alteration that had been made, and found a combination of tube fouling and insufficient flow that was impacting chiller performance. We then detailed a phasing plan to maintain existing system operation during construction.

Chilled water pumping was increased to handle the additional plant capacity, and new underground headers were installed at the existing towers, which were routed into a new, remotely-connected cooling tower. Existing condenser water pipes were combined to take advantage of the installed equipment, which increased the redundancy and resiliency of the system.

The project included the reconfiguration of both chilled water pumping and condenser water pumping systems, allowing HGA to convert Murfreesboro VA Medical Center to an all-variable speed plant. HGA’s predictive optimization sequencing directed the dispatch of plant equipment and selection of setpoints to improve performance. The plant now serves year-round cooling loads with winter loads serviced by a “free cooling” heat exchanger.


Murfreesboro, Tennessee

Building Type

Central Utility Plant


8,000 SF