Development of Multi-Stack Exhaust System for Laboratory Buildings

A multi-stack exhaust system has been developed for use in laboratory buildings. The multi-stack system activates different stacks and uses a variable speed drive (VSD) to change the fan speed when the laboratory exhaust airflow changes. This system satisfies safety requirements and uses less fan power than a conventional system. The typical fan power savings is 40% or higher, depending on the flow usage profile and the exhaust system duct design characteristics. This paper presents the system models and optimization procedures for the design of a multi-stack system.