does not get sufficiently warm in the heat recovery cells, it can be
heated with a water or electric post-heating unit (option). The unit
features an automatic heat recovery bypass function, which
eliminates needless heating of outdoor air during summer. The unit
also has a water post-heating unit with an automatic antifreeze
function.
Antifreezing
The automatic antifreeze function of the heat recovery cells
intermittently stops the supply air fans when the temperature of
exhaust air goes below the set threshold value. In order to minimise
momentary stoppages of the supply air fans the unit is also equipped
with an electric preheating unit or a liquid-circulating preheating
MLV unit.
© Vallox • We reserve the right to make changes without prior notification.
What the units include can vary depending on the sales area.
VALLOX 200SE
9
FILTERING, HEAT RECOVERY / HEATING, MLV RADIATOR
Filtering
Efficient filtering of outdoor air (G4 + F7) prevents harmful particles
from entering the ductwork and rooms via the unit. Good filtering
of extract air (G4) diminishes the contamination of the unit and
ensures efficient heat recovery and extract air fan operation.
Clogging of the supply/extract air filters and of the ductwork can
be monitored by equipping the unit with a pressure difference
switch.
Heat recovery and heating
With efficient heat recovery, most of the heat from contaminated
extract air can be transmitted to outdoor air coming inside. The
efficiency of the heat recovery cell is circa 80%. If outdoor air
0.06
0.08
0.1
0
0.5
1.0
1.5
2.0
MLV unit cooling power
0.04
0.10
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
Pressure loss in liquid circulation of MLV unit
0.06
0.08
MLV unit heating power
0.06
0.08
0.1
0
0.5
1.0
1.5
2.0
Cooling of geothermal liquid of MLV radiator
-2
-10
0
2
4
-12
65
4
6
2
0
6
150
-8
-6
-4
-4
150
65
-2
8
Power and pressure loss in liquid circulation of MLV preheating/cooling unit
Air flow = 150 dm
3
/s
Heating power
, kW
Air flow = 110 dm
3
/s
Air flow = 65 dm
3
/s
Liquid flow dm
3
/s
- liquid = ethylene glycol 25%
- air coming to the unit = -12
°
C
- liquid coming to the unit = 5
°
C
Cooling power
, kW
Air flow
= 140 dm
3
/s
Air flow
= 60 dm
3
/s
Liquid flow dm
3
/s.
- liquid = ethylene glycol 25%
- air coming to the unit = 25
°
C
- liquid coming to the unit = 5
°
C
Heating power
, kW
Liquid flow dm
3
/s.
Temperature of geothermal liquid leaving radiator
°
C
Temperature of geothermal liquid coming to radiator
°
C
Air flows d
m
3
/s
Ethylene glycol 25% Flow 0.075 dm
3
/s
Air coming in -12
°
C
Air coming in -30
°
C
