CDA HCE340 for Manual de Serviço descarregar pdf (Página 13)

VEX340: Control system

Ventilation and airing out can be a major source of energy loss

from a building.

To maintain good indoor air quality it is necessary to continually

replace the air, so that moisture and odours can be removed

from a room. Heat loss resulting from air replacement is signicantly

reduced when ventilation units with heat recovery are used.

Heat loss is practically zero when the VEX340 is installed.

The advantage of counter ow heat exchangers compared to

cross-ow heat exchangers is illustrated in the example below,

which shows the variable temperature curve for a whole year

(24 x 365 = 8760 hours).

Conditions:

Extract air temperature: 22 °C

Supply air temperature: 18 °C

with equal airows

The blue area shows the given share of recovered heat in the

heat exchanger, and the red area shows the need for supple-

mental heat up to 18 °C (desired supply air temperature), if a

heating coil is tted.

Corresponding energy calculations can be done using

EXselect, our product selection tool, where conditions such

as operating hours, supply/extract air temperatures can be

selected. Icing of heat exchanger is not calculated.

Energy calculations

Minimal heat loss with VEX340

Cross-ow heat exchanger VEX340 counter ow heat exchanger

Recovered heat

Heating requirement

Temperature after heat exchanger

Desired supply air temperature

Return air temperature

Outside temperature

RD11854GB-01

-10

-20

-30

1000 2000 3000 4000 5000 6000 7000 8000

h (hours)

(Temperature)

°C

RD11852GB-01

-10

-20

-30

1000 2000 3000 4000 5000 6000 7000 8000

h (hours)

(Temperature)

°C

RD11853GB-01

+22°C

+15°C

+2°C

-6°C

Extract

air

Supply air

+15°C

100%

Fan 2

Fan 1

130%

Exhaust air

Outdoor air

30%

100%

-1°C

RD12483GB-01

Return air principle

Innovative ice detection and control

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