Sabiana ENY-SP-180, Technical Manual

Page: 62 / 85

60
Energy Smart |
SELECTION PROCEDURE
Energy Smart units are designed for controlled air exchange in residential ambiances and minimise heat dissipation due to
ventilation.
As a result, the units must be sized according to the project air exchange flow rate (nominal flow rate Q
SN
), based on the calcu-
lation rule applicable in the country where the unit is installed.
The calculation rule usually applied in Europe is Standard
DIN 1946-6
, therefore the nominal flow rates recommended are
specified according to the area of the building heated directly or indirectly (table 5 of the standard). At the same time, the intake
flow rate should not be less than the general extraction flow rate required (table 7 of the standard), while the
air exchange
per person should be greater than or equal to 30 m
3
/h or, in the event of a particularly high density, greater than or
equal to 20 m
3
/h
.
However, it is possible to use alternative calculation rules, in accordance with the national legislation in force or with the design-
er’s policy.
After calculating Q
SN
, it is the responsibility of the designer to assess the need of balancing the extraction flow
(Q
EN
= nominal extraction flow rate)*, as well as the value of the project static pressure, which must be indicated for each flow in
order to counteract the pressure drops of the air ducts and distribution components (∆p
SN
, ∆p
EN
).
Once the nominal flow rate/static pressure values have been defined, it is possible to use the pressure-flow rate diagrams to
identify the most suitable model.
The model must be selected in order to enable the “Booster”/“Party” modes, which increase the nominal flow rate
by 30%, resulting in an increase of the required static pressure.
Selection procedure:
1. The
maximum supply
and
maximum extraction flow rates
are defined as follows:
a. Q
SN_max
= 1.3 Q
SN
b. Q
EN_max
= 1.3 Q
EN
2. Quick selection procedure, through “fast selection table and diagrams”
Identify the model whose declared maximum flow rate is just above the maximum value between Q
SN_max
and Q
EN_max
.
3. Check that the following maximum supply and extraction points are within the operating ranges of the fans of the selected
unit:
a. (Q
SN_max
; ∆p
SN_max
) , where ∆p
SN_max
= 1.7∆p
SN
b. (Q
EN_max
; ∆p
EN_max
) , where ∆p
EN_max
= 1.7∆p
EN
4. In the event of a negative result, choose the larger model.
* An imbalance of ±10% between the supply flow and the extraction flow is usually accepted.