A multi-floor university building project has central AHUs serving VAVs with induction diffusers. Because airflow at induction diffusers cannot be measured directly with a flow hood, instead they are measured by pressure drop at factory installed ports. Initial work showed that VAV traverses were significantly different than induction diffuser readings. Resolving this conflict required input from the owner, designer, contractor, equipment manufacturer, and Cx provider.
Explain operating principles of induction diffusers
Describe issues related to balancing induction diffusers
Discuss effective coordination with project stakeholders on technical issues and expectations
Describe alternative methods of measuring airflow in induction diffusers
Evergreen Telemetry: Evergreen Telemetry manufactures the unique Wrist ReporterTM, a 6-in-1 meter for Air & Water Pressure / Velocity / Flow / Temperature / Humidity / CO2. The patented Wrist ReporterTM is used for air balancing, commissioning, and troubleshooting in commercial buildings, cleanrooms, and residences. The Wrist ReporterTM displays real-time results from as many as ten wireless sensors at ten different locations. Applications include duct traverse, flow damper setting, ventilation calculations, duct pressures, room-to-room pressure hierarchies, coil performance testing, hood certification, and wireless datalogging. This high-productivity instrument makes TAB and Cx Faster, Easier, Safer.
An independent Testing and Balancing Agency certified by the AABC shall be engaged to Test and Balance the HVAC systems. Systems shall be balanced to plus/minus 10% of design requirements. The contractor shall place all systems and equipment into full operation for Testing and Balancing. One copy of the final Test and Balance report with the AABC National Performance Guaranty shall be sent directly to the engineer of record. Provide five (5) additional copies to the contractor.
AIA-Format LONG-FORM SPECIFICATION
Section 230593 – TESTING, ADJUSTING AND BALANCING FOR HVAC
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