Dantherm DFC 350 - General Principle for DFC Units; Airflow; Efficiency; Principle

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840121 • Version 1.3 • 09.01.2012
OUTDOOR
TEMP
SENSOR
ROOM SENSOR
DAMPER
ACTIVE
COOLING UNIT
AC
SUPPLY
48V DC / 230V AC
DFC
GT1
HEATER
ST2
RADIOBASE SITE
GP
GT2
DFC FLOW
CONTROLLER
LOW DELTA-T UP TO 1,6m
General principle for DFC units
General
A DFC (Displacement Free Cooling) unit supplies the cold outdoor air through a diffu-
sor filter with very low velocity. This will make a dune of cold air at the floor and up to a
height of 1,6 meter in the shelter. The temperature at the ceiling will be relatively high.
The idea is to remove more heat with lower air volume in order to save power con-
sumption of the fan.
This is only possible if a large temperature difference between supply air and air out of
the shelter can be achieved.
Efficiency
The efficiency of the DFC unit depends very much on the circulation of the internal air
circulation in the telecom equipment and in the shelter. It is therefore very necessary to
do a thorough test of the airflows in the shelter before initiating a bigger roll out.
Illustration
The illustration below shows the DFC and some external parts unit mounted in a con-
tainer:
Parts
This table describes the different part (from left to right) in the illustration above:
Part
Description
Outdoor Temp sensor
Measures the outdoor temperature (NTC resistor)
DFC unit
The unit including bag filter and air inlet hood with com-
pact filter
GP
Supply to the unit from power source
Controller
Climate unit controller TKS3000EC, ACUE3000 or oth-
ers
Heater
External electrical heater
Supply 48V DC/230 V AC
Supply to the controller and the DFC
Room sensor GT1
Measures the indoor temperature (NTC resistor)
Active cooling unit
Existing airconditioner (often split unit)
Damper
Electrical damper allowing warm air to leave the shelter
Continued overleaf