Church of St. Joseph
Rosemount, Minnesota USA
Customer: The Church of St. Josephs
Project Contract: US$1,600,000
Project Manager: Steve Lutz & Mike Biebl
The Church of St. Joseph’s is an established parish since the 1850s with a K-8 school located in Rosemount, MN. In 2007, with financing in place and approval from the Archdiocese, the church began construction on a new 44,000 square foot addition to their existing building to house their education program.
The project was originally under design using conventional gas-fired/ DX mechanical systems. However, the church pastor had a passion for GeoExchange systems based on his experience with these systems in North Dakota. In turn, the project architect brought in TRAK International to present its GeoExchange system to the construction team. This system uses central plant hydronic (water-to-water) heat pumps, with four-pipe individual zone fan coil arrangements and several energy recycling components.
The energy-efficient TRAK International GeoExchange system consists of ground source heat pumps, solar panels, energy recovery coils, bore-field, and building management system.
Two 60-ton hydronic heat pumps were implemented to provide simultaneous heating and cooling to zone fan coils. One 10-ton hydronic heat pump with a double-wall heat pump and exchanger was used to provide domestic hot water for the building. Forty solar panels provide either “free” direct heating, source heat for the heat pumps, or recharging of the ground loop depending upon which control sequence is initiated. The heat pumps are custom designed for each project by TRAK and were manufactured at Midwest Fabrication and Supply (MFS), located in Zumbrota, MN.
Six circuits of 10 boreholes each compose the ground loop capacitor. Each hole was drilled approximately 165’ deep. The location and orientation provided many challenges due to possible future expansion.
The TRAK system incorporates the use of a KMC building automation system that operates the heat pumps, air handling units, fan coils, and several control valves to direct heating or cooling fluid and distribute the recycled energy for maximum system efficiency and performance. This web-enabled system allows the operations staff to view their systems operational performance from any place at any given time.