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TF6790_A_NOT_DXA230_EVOLUTION
Aereco S.A.
Specific working of the DXA EVOLUTION version
The EVOLUTION version corresponds to the best HRV solution in terms of
energy savings. In this version, the DX System adapts exhaust airflows
room-by-room based on specific needs, while balancing supply and
exhaust. The exhaust airflows are controlled by humidity sensors or
presence detectors or other activators in the exhaust units.
2.
DESCRIPTION
2.1. GENERAL INFORMATION
The DX System is a range of smart heat recovery ventilation systems that continually supply pollen-free and dust-free preheated fresh air to living areas,
ensuring a comfortable feel-good climate.
The DXA EVOLUTION is a heat recovery unit with demand-controlled airflows for vertical installation (on the wall) in the apartment or in the house, from
2 to 5 main rooms, and from 1 to 5 technical rooms (kitchen, bathroom, others wet rooms). The apartment is limited to 2 floors (1 ground floor and 1 floor
maximum), and has a maximum surface of 210 m². This HRV system can also be used in offices, hostels, etc., if the required airflow is in accordance
with the one offered by the system.
General working of the DX System, EVOLUTION Version
The DX System is comprised of a heat recovery unit (DXA Unit
1
) connected to exhaust units which control airflows. The counter-flow heat exchanger,
integrated into the main unit, ensures the recovery and transfer of most of the energy from the exhaust air to the supply air, thus limiting the energy required
to heat the fresh air.
Airflows are automatically controlled according to the needs of each dwelling’s room (room-by-room DCV): Outdoor filtered air is supplied
3
in the
bedrooms and in the living room. Stale air is extracted
5
from the kitchen, bathroom and WC. On the exhaust side, the BXC units adjust automatically
the airflow, according to parameters read by various sensors: humidity (used in the kitchen, in the bathroom and in WC), presence (can be used in WC).
Versions with switch, presence, remote, CO
2
or VOC sensors can also be used for exhaust units.
According to the size of the dwelling, the exhaust fan motor provides a constant pressure in the exhaust ductwork that can easily be set from the interface
(80 Pa, 100 Pa, 110 Pa or 120 Pa).
At all times, total supply airflows and total exhaust airflows are measured through pressure sensors placed in the DXA unit. The use of electronic pressure
sensors allows to calculate with a very high accuracy supply and exhaust airflows without influence of clogging filters or ductwork pressure drops. So, a
dedicated micro-controller drives the two fan motors in such a way that supply and exhaust massflows are balanced according to the desired airflow setting
point (80 m
3
/h, 140 m
3
/h, 200 m
3
/h or 230 m
3
/h).
When the outside is mild enough, the bypass, located in the DXA unit
1
, automatically allows to the supply air to be filtered and then to be supplied in
the dwelling without going through the heat exchanger, it can also be used in free-cooling mode to provide night cooling in summer.
The DXA EVOLUTION allows 4 specific regulation modes :
-
Absence mode
. This mode runs a 40 m
3
/h airflow ventilation for a
duration the customer may choose within a list of 1, 2, 3, 6, 14 or 30
days.
-
Overventilation mode.
This mode increase ventilation airflows staying
on the bypass rules. The customer may choose the over ventilation
airflows within a list of 140, 200, 230 or 250 m
3
/h for a duration he can
also choose (1, 2, 3, 6, 12 or 24 hours).
-
Free cooling mode or Free warming mode
. This mode is an over
ventilation mode enable only if temperature conditions allow to refresh or
to warm the dwelling.
-
Stop mode
. This mode allows to stop the fan motors. This mode may be
useful, for example not to clog the filters in case of works in the dwelling.
