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
© Vallox • We reserve the right to make changes without prior notice.
FILTERING, HEAT RECOVERY, HEATING/MLV RADIATOR
12
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 in dirty extract air
can be transferred to the outdoor air that is taken inside. The
efficiency of the heat recovery cell is about 80%. If outdoor air
does not get sufficiently warm in the heat recovery cells, it can be
heated with a water-circulating or electric post-heating unit. The
automatic heat recovery bypass function in the unit ensures that
there is no need to heat outdoor air in summer. The unit also has
an automatic defrost function for the water-circulating post-heating
unit (VKL model).
Defrost
When exhaust air temperature goes below the threshold value set,
the automatic defrost function of the heat recovery cell switches
the preheating unit on. If the power of the preheating unit is not
enough, the unit momentarily stops the supply air fan.
VALLOX 200 SE
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
Ethylene glycol 25% Flow 0.075 dm
3
/s
Air coming in -12
°
C
Air coming in -30
°
C
Liquid flow dm
3
/s
Air flow = 60 dm
3
/s
Temperature of geothermal liquid coming to radiator
°
C
Temperature of geothermal liquid leaving radiator
°
C
