PWGC was responsible for implementing a test closed loop and thermal conductivity testing, design of the borefield, supply and return piping and headers, and the buried manifold vault located outside adjacent to the mechanical room. PWGC provided construction administration and full-time inspection services during construction, including witnessing start up testing procedures and performance tests.

The closed loop borefield consists of 48 loops each drilled to a depth of 470 feet. Given the building’s cooling-dominant load profile (peak cooling load of 90 tons), PWGC designed in the ability to tie in a dry cooler in the future to supplement the geothermal system, if needed, during peak cooling periods.

We coordinated closely with the architect and mechanical engineer for critical integration of the loop field with the building-side of the system, including the need for a hybrid system. This loop field had to be carefully designed and located on this small urban site to avoid conflicts with other site features such as the bioswale, stormwater mains and drywells, and the soil drainage system.