St. Joseph Elementary School
Rosemount, Minnesota USA
Customer and General Contractor: Aldofson & Peterson
Construction Manager: Jeff Maxwell (250-575-5856)
TRAK Contract Amount: $2,000,000 (GeoExchange & Controls)
TRAK provided the plumbing, piping, HVAC and GeoExchange design for this 44,000 square foot K-8 school addition to their existing sanctuary and administration space. The school addition includes eleven classrooms, a library, a two-story gymnasium, a kitchen and a large social area. The installed system has two nominal 60-ton heat pumps that provide simultaneous heating and cooling for the space. The system also has one nominal 10-ton heat pump providing domestic hot water.
Heat pumps were manufactured at Harris’ fabrication shop, Midwest Fabrication and Supply (MFS) in Zumbrota, MN. Forty (40) hydronic solar panels provide “free” direct heating source heat for the heat pumps or recharging of the ground loop depending upon which control sequence is initiated. Each fan coil has a TRAK Energy Device (TED box) that incorporates incoming hot and chilled water supply piping and supplies outgoing piping to the fan coils. The TED box switches the system from heating to cooling based upon inputs from the zone temperature control sensors. Two (2) heat recovery coils are in the building relief air streams to capture energy from the warm air before it leaves the building. The heat recovery coils can be used to blow-off system heat if needed to maximize the efficiency of the system as a whole. Harris Companies modelled the Mechanical Room in 3D and sent the information to MFS for full prefabrication of the Mechanical Room piping.
Upgrade: In 2021, TRAK completed a controls update and integration with a new 1MW PV Solar farm that produces all the school's electrical needs with excess sold back to the grid.