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2.4 Heat exchanger
– MHX 85
Introduction
This section will give you a description of the MHX 85 and its functionality.
The MHX85 is a high end heat-exchanger especially designed to meet the require-
ments and challenges within telecom applications.
Core of the product is the new revolutionary Dantherm plastic counter flow heat ex-
changer core, which offers unique performances. It is powered by top quality DC fans
and controlled by specially designed embedded microprocessor operated controller.
Sheet metal
The cabinet is made of aluzink
®
sheet metal parts. The heat exchanger outer cabinet
(chassis body) is made out of one big part sealed and riveted together in each corner.
One big lid is riveted to this part. Internal parts are riveted and screwed together. The
tightness between the inner- and outer circuit is obtained by use of soft foam/gaskets
and liquid sealant. Cleaning of the internal and external fans as well as cleaning of the
core is possible through inspection/service lids.
Mounting
The heat exchanger unit is designed to be fixed to the inside of the door by using 4
long M8 screws (13 mm hex head). A gasket is applied between heat-exchanger and
door duct to seal the airway and maintain the IP55 barrier.
Illustration
This illustration gives an overview of the
heat exchanger which is build into the
MTS4-outdoor enclosure (seen from inside
the cabinet):
Two separate air
flows
The two air flows (internal/external) are totally separated (IP55). The external air is only
used to cool down the internal air via the heat exchanger. The air flows are never
mixed.
Internal air flow
The warm internal air is sucked from the enclosure into the internal fan at the top of the
MHX 85 and let through the heat exchanger, where it is cooled down.
After the cooling in the heat exchanger, the air is let back into the enclosure.
External air flow
The cold external air is sucked into the external fan at the bottom of the MHX 85 and let
through the heat exchanger, where it is cooling down the internal air.
After having passed through the heat exchanger, the air is let back to the external envi-
ronment at the top of the unit.
Continued overleaf
Air inlet, this is where the warm air
returning from the enclosure is be-
ing sucked into the heat exchanger
to be cooled down
Supply air outlet, from
where the cooled air is
supplied back to the en-
closure
