NEBB Building Systems Commissioning Certified Professional case studies
NEBB Building Systems Commissioning Certified Professional · Put your knowledge to work in context.
The NEBB Building Systems Commissioning (Cx) Certified Professional credential is an individual certification offered by NEBB, an association established in 1971 that describes itself as the premier international certification association for firms and their individuals that deliver high performance building systems. NEBB states it is the only high-performance Building System organization offering certifications across 8 disciplines, and that it has certified over 750 firms and 3,205 individuals across multiple countries and continents. The NEBB Building Systems Commissioning Certified Professional case studies are 5 cases and about 2,487 words.
1Variable Primary Chilled Water Plant: Remote DP and Low Delta-T
At a 12-story office, the new chilled water plant is variable primary flow: two 600-ton chillers, three 400-gpm pumps, design 1,200 gpm at 12°F delta-T, and a bypass valve across the plant headers. The differential pressure sensor was installed at the pump discharge header, and the BAS controls pump speed to hold 45 ft there.
584 words, about 3 min2AHU Economizer: Mixed-Air Temperature Does Not Match Command
AHU-3 serves a 20,000-cfm office zone. It has linked outdoor-air, return-air, and relief dampers, a dry-bulb economizer high limit of 65°F, and a mixed-air low limit of 45°F.
474 words, about 2 min3VAV Ventilation Rate and Demand-Controlled Ventilation Acceptance
An 18,000-ft², 120-person open office has a VAV system with 24 boxes. Design outdoor air is calculated per ASHRAE 62.1-2019 Ventilation Rate Procedure: Rp = 5 cfm/person, Ra = 0.06 cfm/ft², system ventilation efficiency Ev = 0.8.
478 words, about 2 min4Stair Pressurization: Nonuniform Pressure and Door Force
During acceptance testing of a 10-story building's stair pressurization system, the project design calls for 0.10 in. minimum and 0.25 in.
466 words, about 2 min5Heating Coil Freeze Failure: Sequence and Freezestat Protection
AHU-8 is a 12,000-cfm built-up unit with a hot-water heating coil, outdoor and return air dampers, and a factory-mounted freezestat with a 6-ft capillary on the leaving-air face. The unit serves a lab and runs 24/7.
485 words, about 2 min