Central Park - Building 7

The Challenge

Being a new office complex the challenge was set to provide highly efficient tempered fresh air to the building with a minimum fresh air design requirement of 1.43 l/s (per m2 of floor). Varying occupancy rates throughout the working day meaning the air handler unit fans would operate on variable speed drive. Adding to this challenge was the desire to connect the building’s fresh air ventilation solutions to the building management system.

The Solution

Factory corrosion treated Mitsubishi Electric City Multi Y Series Outdoor units (-BS) were combined with Mitsubishi Electric Air Handler Unit (AHU) controllers fitted to two purpose built air handlers from Energy Products International to provide tempered outdoor air to the entire building.

The Mitsubishi Electric Air Handler Unit (AHU) controllers enable variable volumes of fresh air to be supplied to the building depending on its needs at any given time. In Building 7 this is achieved through the use of CO2 sensors which have been strategically stationed at key areas around the building. These CO2 sensors then link back to the Building Management System, and the air handler unit’s and outdoor unit’s will either ramp up or down depending on the levels of occupancy. The variable air volume systems on the air handler unit’s which allow this provide developers with the flexibility to isolate unoccupied floors without wasting energy or affecting the operation of the system.

In short, by controlling the amounts of outdoor air delivered to the building based on actual requirements the maximum efficiency can be achieved as is the case for Building 7.

In adhering to the developers other wishes to link the air handler units and outdoor units to the Building’s Management System, the relatively simple solution of using a BAC-HD150-E (BACnet) interface was decided upon.

Building 7: Air Handling Unit

Building 7: Genesis Fitout