Airflow Measurement & Control with Induction Diffuser Technology
Abstract:
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.
Learning Objectives:
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
Sponsored by:
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.
