Principles and procedures of Total Building Commissioning (Cx) are presented as a case study of the U.S. District Courthouse, which is being constructed in Salt Lake City, Utah, USA, as a design-bid-build project. This 10-story building has a floor area of approximately 357,000 gross square feet and has an estimated construction cost of $177 million. The construction is to be completed in July 2014. Setty performed total building commissioning to Commissioning (C x) to evaluate the integrated performance of building systems.
The new courthouse was designed in accordance with the PBS Facilities Standards P100-2005 and the 2007 U.S. Court Design Guide. It has also been designed to achieve “gold certification” in accordance with Leadership in Energy and Environmental Design (LEED®), which, through its requirement for commissioning, is intended to verify that the building has been designed and built using strategies aimed at improving overall performance compared to a baseline design.
This case study focuses on commissioning of several systems during the design phase, and partial commissioning of the envelope system, which was the only system available for performance testing during the early stage of construction. Findings and conclusions are presented regarding performance enhancements of several systems attributable to commissioning during the design phase, and performance testing of the envelope system during the early construction stage.
1) Successful Total Building Commissioning (C x ) is highly dependent on the clarity and timeliness of the criteria and procedures that are defined in the Owner’s Project Requirements (OPR). The 10-year gap from start of initial design to start of construction was an impediment to the C x process in this case study.
2) C x is more than a design process. Commissioning of the physical systems to pre-set criteria at the onset and duration of construction is critical to successful building performance.