In this project the challenge for AIRA was to provide a solution that helped get the lobby and open area ventilation system at the Grand Central Apartments working in the most energy efficient way.
The standard method for a conditioned space usually involves a large air conditioning plant. But AIRA created an alternative solution with a smaller footprint that was cost effective and used less power.
It actually helped the building owner reduce DX system capacity and achieve a higher Green Star rating for the development. The solution which reduced plant load is an Indirect Lobby Heating Cooling Ventilation System.
Basic operation of this unit involves two airstreams into the system. This is how it works.
Airstream one is via the evaporative cooler which precools air by up to 12 degrees depending on relative humidity.
This airstream passes over an energy recovery coil in section two of the system then vents to atmosphere. The second airstream is drawn over filters and the energy exchanger, picking up the sensible cooling load from airstream one.
This air then passes over the DX coil if additional cooling is called for, then through fans and across the heat exchanger (heating section) which provides make up heating when heating is required, and then into the lobby area as a tempered pressurised supply air stream.
This dry air evaporative cooling allows for a much smaller cooling coil and the gas fired heater cuts the running cost of the DX system. Since the completion of the project AIRA has returned to the site a number of times to check the system is working exactly as intended.
AIRA has worked closely with the building consultant to reduce energy consumption and increase comfort. In addition, the building was successful in obtaining an enhanced Green star rating.
AIRA has installed these systems in six apartment towers in Melbourne including the Abode Apartment, The Void and Atrium.