PROJECT
4
2 3
5 6
In terms of operating logic and controls, a fully integrated
system like this can only be controlled and managed
through a central controller. In this case, a PLC was
custom built for the project and the controls integrated into
a human media interface (HMI), which allows the client the
control and visual operation of the entire system.
Valsir’s design software — Silvestro — was used to
calculate the heat loads and the design piping and to
incorporate this into the CAD drawings that the architects
had generated for the building. Dwg-format drawings are
uploaded into the software, and then various inputs are
fed into the software. It then generates reports on the
required heating/cooling capacity, flow rates, piping, and
pressure drops.
Since the site covers a large area, and there are long
pipe runs between the blocks, over 11km of Valsir Pexal
multilayer pipe were used on this installation, ranging
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from 16mm to 63mm in diameter. Pipes from 16mm
to 32mm were supplied pre-insulated and in rolls. This
eliminated the need for elbows and joints on these
smaller-sized pipes. 1.
By using Valsir’s new Bravo-Press crimp fittings,
available from 16mm to 75mm, it reduced the cost when
compared to conventional joints, as it increased the ease
and speed of installation. 3.
“All of the suppliers were willing to go the extra mile
and make a success of the project,” explains Dennis
Holden of Reliance Eco, who designed the integrated
geothermal HVAC system. “Since this was the first of its
kind, there was a lot that needed to be designed and
correctly selected for the application. Having the correct
team was key, and the important factor was that each
of these suppliers were part of the team that made it all
come together.”
2.
4.
5.
6.
Valsir multilayer
pre-insulated pipe
installed beneath
the slabs.
Storage tanks for
backup water supply.
Header connection
point in the
control room.
Wilo inverter pumps,
swimming pool heater
pumps, and municipal
booster pumps.
Fondital 32kW
condensing gas boiler.
The central plant room.
July 2018 Volume 24 I Number 5