Ventilair Comair Aquacom, Manual, Page: 4 / 30

4
I Glossary
To use the Aquacom correctly, it is important to
know the following definitions first.
Ground heat exchanger
A ground heat exchanger is used to preheat the
supply air in the winter and to cool it in the
summer, by using the constant temperature of the
earth. Ducts are placed in the ground, in which a
fluid is circulating. This fluid takes over the
temperature of the ground and is then guided
through a heat exchanger in which the supply air is
heated or cooled.
Balanced ventilation
There is balanced ventilation when there is as
much air extracted from a building than there is
supplied.
Bypass (standard for HRUC-E)
The bypass is used during the summer period, to
extract the heat of a building in the evening or at
night. One of the air flow is not conducted over the
heat exchanger, so the extracted heat is not
transmitted to the supply air flow.
Filter
For an optimum quality of indoor air, the outside
air is conducted through filters before it enters the
building. This keeps the channels of the heat
exchanger cleaner and therefore more efficient.
System D
System D stands for balanced ventilation system
with mechanical supply of fresh air (by fans) and
mechanical extraction of contaminated air. The
amount of supplied and extracted air is adjusted by
the valves.
That is why it is important to keep the same
settings of the valves and to keep the valves at the
same place. It is also important that air can
circulate well in the house, so make sure that
openings under doors are not sealed or reduced.
Cross-flow heat exchanger
The heat exchanger is the part of the Aquacom
where the heat is exchanged between the glycol-
water mix and the supply air. It consists of
aluminum plates that are corrugated. Along these
plates, supply air flows without directly coming
into contact with the glycol-water mix. They speak
of cross-flow because the air flow is perpendicular
to the glycol-water flow. This will yield a higher
performance compared to a co-current heat
exchanger.
Frost protection
To prevent freezing of the heat exchanger of a
ventilation unit at temperatures below 0°C, there is
frost protection. By application of a ground heat
exchanger, frost protection will be necessary only
at lower temperatures. Aquacom also has frost
protection, this ensures that its heat exchanger will
not freeze.
Heat recovery (HR)
The heat exchanger of the ventilation unit will
extract the heat of the exhaust air. This heat is
then transferred to the supply air. In this way, heat
is recovered that normally should be blown out of
the house.