The control system includes variable frequency drives (VFDs), a duct sensor, and a separate factory-programmed logic controller (PLC) and can operate as a stand-alone or integrate with a building management system using BACnet.
Are your sequences state based? Is there a finite set of conditions that drives your control sequences? If not, you may be missing out on one of the most intuitive ways to write control sequences.
Sensored and sensorless control are among the options to satisfy ASHRAE 90.1
February 21, 2020
An increasing emphasis on variable speed pumping as a means to save energy in commercial buildings has provided engineers with many paths to efficient hydronic system design.
Last month, I started to explore when to use simple sequences and when to use complex sequences. Part of creating the correct sequence lies in the proper use of technology.
Should engineers create a complex sequence that utilizes freely programmable controllers or implement a simple sequence that utilizes the controls that are embedded within the equipment?
It’s the heating season here in North America and that means building operators and controls contractors will soon be scrambling to ensure their heating systems are working properly.
In our day-to-day work as design engineers, this term is typically used in design discussions with an owner to imply some level of building data collection and analysis.
The control systems we use in commercial buildings today have evolved over the last 30 years to provide systems that are cost effective, and provide good performance.