Manual master DHA 360 (page 7 of 91) (All languages)

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PLEASE TAKE TIME TO READ THIS MA-

NUAL CAREFULLY BEFORE USE AND

SAVE IT FOR FUTURE REFERENCE.

► 1. PRINCIPLE OF OPERATION

The dehumidier removes water from an airow through,

and the removed water is carried away from the dehu-

midier with the regeneration air (henceforward called

reg.–air). Water adsorption and –extraction takes place

in an rotor made of water resistant silica gel. The air

ows in the dehumidier divides the rotor in two parts :

drying part and reg.–part.

Two separate air ows goes through the rotor as this:

– the main air (moist air inlet) goes through the drying

part, and leaves the dehumidier as dry air

– the reg.–air is taken from the process air, after

passing through two purge sections of the rotor. The

air is then heated to app 110°C by the build–in PTC

heaters. The warm air then passes through the reg.

section of the rotor and removes the adsorbed water

(as water vapours). The water vapours and the reg.–

air now leaves the dehumidier through the reg.– air

outlet.

The two air ows are xed and the rotor turns – this gives

an automatic process of simultaneous adsorption and

water extraction.

► FIG. 1:

1. lter,

2. fan,

3. rotor,

4. dry air,

5. PTC heating element,

6. regeneration air outlet,

7. drying sector,

8. regeneration sector,

9. pure sectors.

CAPACITY DIAGRAM (FIG. 5).

The inlet conditions of the air to be dried, determines

how much water the dehumidier will remove.

On the capacity diagram shows how much water will be

removed per kg process air.

Example, DHA360: (shown in the diagram – FIG. 5)

– inlet air conditions 20°C, 60 %RH, gives water con-

tent 8,7 g/kg

– the diagram shows then dry air condition of X= 5,6 g/

– removed per kg air is then: 8,7 – 5.6 = 3,1 g/kg

Capacity DHA360 at this condition:

Dry air ow is nominal

400 m

/h =(x1,2) = 480 kg/h

Capacity, removed water per hour

= 480x3.1 = 1488 g/h

= 35 kg/24h

Capacity for DHA140 and DHA250 to be calculated in

the same way, using 120 and 290 m

/h.

The temperature of the dry air is higher than for the inlet air.

This is caused by the evaporation heat release and heat

gain from the rotor. The temperature is shown to be 33°C.

If bigger specic capacity g/kg is needed, this is possible

if the process air is reduced to less than nominal.

► 2. APPLICATIONS

Dehumidiers in the DHA range is used for dehumidica-

tion of ambient air at normal atmospheric pressure. This

can be an installation for moisture control in an unheated

store room, in a water work building, production room

for hygro–scopic materials... – with the dehumidier in a

separate installation.

The dehumidier also can be used as a part of a bigger

air treatment system. Here the dehumidier often will be

placed in a by–pass to the main system.

In this case the pressure in the main system will inuence

the dehumidier – and your supplier must be contacted,

as this can inuence the capacity of the dehumidier.

Normally the dehumidier will be placed on the oor, on

a table or in a wall bracket (option). It should always be

placed horizontal, resting on the four pcs. rubber sup-

ports.

The air to the dehumidier should be free from solvents

or other explosive components, and should be free from

pollution from solid particles, oil vapours and exhaust

gases from Diesel engines.

For air to the dehumidier the following limit values must

be respected:

– max. humidity ...................... 100%RH

– max. Temperature ................... 35°C

– max./min. pressure ................. ambient +/–300Pa

The DHA range is for indoor, stationary or temporary

installations. Should not be placed in rooms with

possibility for free water on the cabinet.

CONTENTS

1... PRINCIPLE OF OPERATION

2... APPLICATIONS

3... COMPONENTS

4... INSTALLATION

5... COMMISSIONING

6... AIR FLOWS

7... MAINTENANCE

8... TROUBLE SHOOTING

9... SERVICE/REPAIR

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