BT15B012GB-00 ELFOFresh² 15
Multiplies the energy recovered from exhaust air
Passive cross-ow recovery unit and 70% eciency rate
The passive recovery unit is able to supply, by recovering it from exhaust
air, only a small percentage of the energy required by the building.
Therefore, the residual demand needs to be provided by a generator,
which in the illustrated case is a traditional boiler.
The system’s seasonal eciency drops considerably due to the poor
contribution of the recovery unit.
Thermodynamic recovery unit
The graph shows how under the same ambient conditions and in the
same building, the part of energy that is recovered and supplied in the
room can be as high as 80% of the overall energy demand.
The favourable conditions ELFOFresh
2
operates in and the important
contribution in terms of energy supplied ensure a relevant input to the
seasonal eciency of the whole system.
Improved Energy Eciency Class for the building
ELFOFresh²’s eciency reduces
the absorbed primary energy in
comparison to a traditional system.
The example shows that, having the
same building features (insulation,
doors and windows, etc.), replacing
the crossover ows recovery with
ELFOFresh² unit, the class of energy
eciency increases from C to B.
Also, considering the use of Gaia as
a primary generator, the building
energy class becomes “A”, thus
remarkably increasing the building
value.
NOTES: This ex. refers to the energy eciency classication according to the Italian guidelines, as per Law Decree dated 26 June, 2009, for a single house in Milan, with climate
class E, and with the following features: Floor surface: 200m
2
; heated gross volume: 600m
3
; dispersing surface: 440m
2
; S/V ratio: 0.73m-1. Walls and roof insulation: compared to
the limit U- value as per law (Uwalls: 0.34; Uroof 0.30; Ubasement 0.33; Uwindows: 2.2 W/m
2
K).
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