Case studies

LonWorks system that provides monitoring and control of the following mechanical systems:

• Variable air volume air handling unit with heat recovery wheel, hydronic heating/cooling and associated terminal units
• Radiant slab heating/cooling hydronic loop with three packaged heat pumps and 10 zones
• Finned tube radiators
• Building exhaust fans
• Natural ventilation using window motor actuators and conditions based on various temperature and wind speed sensors

A major terminal addition to Roberts Field Redmond Municipal Airport with control of several major HVAC systems:

• Boiler hot water generation, distribution and flow monitoring system
• Central refrigeration equipment, such as: chillers, cooling towers, power purification system and condenser water system
• Several variable air volume air handling units and associated terminal units both with and without hydronic reheat
• Radiant floor heating
• Hydronic fin tube heaters
• Infrared unit heaters
• Multiple exhaust fans

A 2010 Daily Journal of Commerce Top Project Finalist for Public Buildings $5 Million – $15 Million. Open system that integrates LonWorks, BACnet and Modbus protocols into one user interface:

• BACnet communication trunk carries interface with variable frequency drives and airflow monitoring stations
• LonWorks trunk carries variable air volume air handling units with heat recovery wheel, hydronic heating/cooling, airflow monitoring stations, carbon dioxide and humidity control
• Fire alarm panel interface and general exhaust fan control
• Clerestory window control with remote control/monitoring station and rain sensor
• Modbus communication trunk to interface with boiler and chiller prepackaged controllers
• Photovoltaic array controls to supplement domestic hot water
• Control of 30 hydronic radiant manifold zones

A 2010 Daily Journal of Commerce Top Project 3rd Place Award for Private Buildings $5 Million – $15 Million. This project included controls for the following equipment:

• Boiler hot water distribution system
• Roof top unit with powered exhaust, hot water heat, and direct expansion cooling
• Several heat pumps
• Building exhaust fan controls using a variable frequency drive to maintain static pressure

A 2010 Daily Journal of Commerce Top Project 1st Place Award for Public Buildings $15.1 Million – $50 Million. Designed for LEED® Silver certification, the building met or exceeded LEED® requirements for efficiencies in uses of water, energy, materials and operations. Siemens TALON System controls the following pieces of equipment:

• Variable air volume air handling units
• Several terminal units with electric stages of reheat
• Several fan-powered terminal units with electric stages of reheat
• Several fan coils with direct expansion cooling
• Several building exhaust fans
• Domestic hot water distribution