Principle Of Operation - MCS Master DHA 140 Manual De Instrucciones Para El Uso Y Mantenimiento

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1... PRINCIPLE OF OPERATION

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2... APPLICATIONS
DE 3... COMPONENTS
4... INSTALLATION
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5... COMMISSIONING
6... AIR FLOWS
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7... MAINTENANCE
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8... TROUBLE SHOOTING
9... SERVICE/REPAIR
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PLEASE TAKE TIME TO READ THIS MA-
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NUAL CAREFULLY BEFORE USE AND
SAVE IT FOR FUTURE REFERENCE.
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►► 1. PRINCIPLE OF OPERATION
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The dehumidifier removes water from an airflow through,
and the removed water is carried away from the dehu-
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midifier with the regeneration air (henceforward called
reg.–air). Water adsorption and –extraction takes place
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in an rotor made of water resistant silica gel. The air
flows in the dehumidifier divides the rotor in two parts :
LT drying part and reg.–part.
Two separate air flows goes through the rotor as this:
– the main air (moist air inlet) goes through the drying
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part, and leaves the dehumidifier as dry air
– the reg.–air is taken from the process air, after
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passing through two purge sections of the rotor. The
air is then heated to app 110°C by the build–in PTC
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heaters. The warm air then passes through the reg.
section of the rotor and removes the adsorbed water
PL (as water vapours). The water vapours and the reg.–
air now leaves the dehumidifier through the reg.– air
outlet.
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The two air flows are fixed and the rotor turns – this gives
an automatic process of simultaneous adsorption and
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water extraction.
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► FIG. 1:
1. filter,
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2. fan,
3. rotor,
4. dry air,
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5. PTC heating element,
6. regeneration air outlet,
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7. drying sector,
8. regeneration sector,
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9. pure sectors.
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CAPACITY DIAGRAM (FIG. 5).
The inlet conditions of the air to be dried, determines
how much water the dehumidifier will remove.
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On the capacity diagram shows how much water will be
removed per kg process air.
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Example, DHA360: (shown in the diagram – FIG. 5)
– inlet air conditions 20°C, 60 %RH, gives water con-
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tent 8,7 g/kg
CONTENTS
– the diagram shows then dry air condition of X= 5,6 g/
kg
– removed per kg air is then: 8,7 – 5.6 = 3,1 g/kg
Capacity DHA360 at this condition:
Dry air flow is nominal
400 m /h =(x1,2) = 480 kg/h
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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
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 specific capacity g/kg is needed, this is possible
if the process air is reduced to less than nominal.
►► 2. APPLICATIONS
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Dehumidifiers in the DHA range is used for dehumidifica-
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 dehumidifier in a
separate installation.
The dehumidifier also can be used as a part of a bigger
air treatment system. Here the dehumidifier often will be
placed in a by–pass to the main system.
In this case the pressure in the main system will influence
the dehumidifier – and your supplier must be contacted,
as this can influence the capacity of the dehumidifier.
Normally the dehumidifier will be placed on the floor, 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 dehumidifier 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 dehumidifier 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.
/h.
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