Summer Consultants led a multi-discipline team to renovate the four-story office and courthouse facility including replacement of the chillers and penthouse roof.
The two existing 100-ton chillers were replaced with two 140-ton air-cooled chillers with remote evaporators, which eliminated the need for a glycol solution for system freeze protection due to the chillers’ location on the roof. The two existing pumps were replaced with three new 5 horsepower pumps and two 10 horsepower pumps in a primary secondary configuration to provide N+1 redundancy. Variable frequency drives were provided for each pump to reduce energy consumption. Additional work included the relocation of two exhaust fans, provision of a new rooftop exhaust fan and provision of direct digital controls which were integrated with the building’s existing BAS system.
The existing 3,400 SF penthouse asphalt and fiberglass felt membrane roof was replaced with a new fully adhered PVC membrane roof. Additional features included a new roof hatch, access ladder, permanent fall protection, and a lightning protection system.
Because the new chillers were 3,000 lbs. heavier and a foot taller than the existing chillers, new steel frames were designed to provide additional structural support for the chillers without having to significantly strengthen the underside of the roof framing. Commissioning was also completed for the new chillers and pumps.