In 2003, Heuch was engaged by Munters Australia to provide engineering and equipment support for the installation of a new environmental chamber to be constructed at the University of South Australia in Adelaide for ongoing research and development programs involving athletes and various other personnel.
The equipment was manufactured in Melbourne, where it was matched to a master system by Munters. Heuch personnel attended site for the commissioning and testing after installation by University contractors.
Continuous site monitoring during this period was provided by direct connection between the unit controller and the Heuch Service Network. This allowed for quick and effective tuning of control loops and allowed Heuch Service Engineers ready assessment of potential areas by the monitoring software.
The installed equipment controls the room temperature anywhere between -10oc and + 40oc. A single semi hermetic refrigeration service compressor with a variable speed drive and electronic discharge bypass provided 0% to 100% unloading as required. This arrangement provided the maximum possible capacity turndown.
The equipment was split into four separate sections. There was a fan / coil unit, a packaged air cooled refrigeration service unit, an electrical control cubicle and an air distribution sock for the room.
The package consisted of:
- A vapour tight housing made of 100mm sandwich panel. The housing has inlet and outlet flanges as removable panels to provide access for filter removal and general maintenance.
- A return air roughing panel filter.
- An evaporator coil with aluminium fins, copper tube and aluminium frames. This also allowed for a defrost cycle, as necessary, for operation at 0oc and +5oc room temperatures with high humidity.
- A centrifugal belt driven air circulation fan.
- The air cooled condensing unit was supplied on a common skid base and consisted of a large air cooled condenser, compressor assembly and all necessary refrigeration service components.
The compressor is speed controllable between 750 and 1750 RPM with electronic discharge bypass used to further reduce the cooling capacity and give full capacity control over the full operating temperature range. The air cooled condenser with multiple fans and epoxy coated fins will be cycled in response to the compressor discharge temperature.
A replaceable filter / dryer with upstream service valve was installed to allow for pump down of the refrigerant for ready servicing.
The following mechanical safety devices were incorporated to protect the equipment in the event of a fault condition, for example, compressor low refrigerant pressure, compressor high refrigerant pressure, compressor high discharge temperature and compressor oil pressure.
The electrical enclosure houses all the electrical equipment and has a Heuch DDC on board to communicate with the client’s input/outputs. The enclosure is constructed of heavy gauge sheet steel suitably braced to maintain rigidity and complete with hinged lockable access doors weather proofed to a IP55 standard. The enclosure houses all electrical controls and Heuch DDC equipment.