Page 24 - Climate Control News Magazine July 2021

Building Services
Air handling unit at a shopping mall.
Detailed study of
chilled bTeam systems
HERE ARE A few examples of Passive The second is a High Temperature Chiller us-
Chilled Beam (PCB) systems with 100 ing a dedicated chiller to generate and distribute CHILLED BEAM AIR per cent once through outside air cy- HTCHW to the ACBs at zone level.
CONDITIONING SYSTEMS WERE cles, however, the majority of newer This chiller runs at a much higher COP for this
A RARITY IN AUSTRALIA UNTIL
AROUND 2005 WHEN THERE (ACB) configuration with recirculated air. function more efficiently.
WAS HEIGHTENED AWARENESS ABOUT ENERGY EFFICIENCY, AIR‐QUALITY AND GREENHOUSE GAS EMISSION REDUCTION.
The ARBS Education and Research Founda- tion commissioned research paper (from page 6) provides a detailed study of Active Chilled Beam (ACB) systems, and compares the performance of two chilled water plant configurations.
The first is Standard using a single Chilled Water Plant (CHWP) of multiple chiller configu- ration, which uses a Heat eXchanger (HX) to de- liver High Temperature Chilled Water (HTCHW) to Active Chilled Beams (ACBs) at the zone level.
Both systems use a central Air Handling Unit (AHU), that has a function similar to that of a Dedicated Outside Air System (DOAS), which delivers de‐humidified and conditioned air to the ACBs at zone level.
In keeping with recent design trends for such systems in Australia, the AHU is set to recircu- late air and includes an economy cycle that is carefully controlled.
Since the first evaluations, carried out two
projects adopt an Active Chilled Beam duty and allows the overall HVAC system to
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