RUN-AROUNd-cOIL-SySTEM ENERGy REcOvERy - AL-KO

System description
Operation of the AL-KO
run-around-coil-system
I Use of high performance heat exchangers
in a multiple countercurrent circuit. This
achieves high annual utilisation ratios
of 80 %.
I Each heat exchanger has only one mode
of air-flowing through (fresh or extract
air) so that germs and contamination
cannot be transferred.
I The system is used during the winter
period to pre-heat the fresh air and in
the summer to pre-cool the fresh air
through adiabatic cooling of the ex-
tract air.
I Because of humidification of the ex-
tract air during summer period the air
is cooled and the cooling transferred
to the supply air. Humidity cannot be
transferred between the air-flows Be-
cause the exhaust air temperature is
raised in the exhaust air heat exchanger,
it leaves the building without moisture.
I Depending on the type of humidifier
(evaporation humidifier, high pressure
nebuliser, air washer) the humidification
is able to use service water, demin-
eralized or adul terate water.
I The AL-KO outside air heater can be
divided in accordance with VDI 6022.
The defroster with wide fin spacing, in-
stalled before the filter, raises the out-
side air temperature sufficiently to avoid
frost formation on the filter medium
and thus ensures compliance with the
relative humidity required by VDI 6022.
ETA
SUP
performance
control
pump-hotwater
50/30
I For dehumidifying an additional heat
recovery system exchanger is installed
after the dehumidifying cooler. During
dehumidifying operation the energy me-
dium will first be directed over the heat
recovery reheater to raise the supply air
temperature. The thereby reduced water
temperature considerably reduces the
outlet temperature at the heat recovery
coil. This system circuit saves approximately
20 % cooling capacity.
Hybrid humidifier
ZL
M
MID
PTH
DVE
M VE
SN
M
Hydraulic
Modul
pump-hotwater
50/30
5 2 4 3 2
EHA
ODA