12 ELFOFresh² BT15B012GB-00
The principle of cooling and heating operation
Recovery that does not penalize ventilation
The mechanical, controlled-ventilation system with active recovery involves a unit, with an extremely ecient refrigeration circuit with
reduced air-side pressure drops and signicant energy cost reductions for ventilation compared with traditional static systems.
Active thermodynamic recovery exchangers have high-eciency n batteries that guarantee extremely modest pressure drops during the
entire operating cycle.
Winter operation
The indoor air (A), at a temperature of 20°C, before being released outside
(C) becomes the thermal source of the heat pump passing through the
evaporation coil (B) so that the heat can be recovered.
The cooling uid of the heat pump, after withdrawing the heat from the
exhaust air, through evaporation, releases it to the fresh air (D) through the
condensation coil (E) before to be released into the rooms (F).
Summer operation
Through the 4-way valve, the cooling cycle is inverted so that the “cold”
contained in the exhaust air ow (A), is used in the condensation coil (B)
before being exhausted (C).
The fresh air (D), viene ltrata, is ltered, cooled and subsequently
dehumidied passing through the evaporator (E) before being released into
the rooms (F).
Intermediate season operation (FREE-COOLING/FREE HEATING)
The summer fresh air conditions, especially at night, may be more agreeable
than the indoor ones, at least in terms of temperature.
Houses, in fact, accumulate the heat during the central hours of the day and
then let it during the night. In similar conditions, the ELFOFresh
2
technology
allows the air supply in the room at cost zero, “FREE-COOLING”, only with
the fan operating.
The contrary phenomenon, the “FREE-HEATING”, occurs in particular
climatic conditions, e.g. in the South of Italy.
Thanks to modulating fans, is possible to introduce in the room an air ow
higher than the one strectly necessary to the normal renewal.
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