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Dricon
Ammonia
The 3C concept has been extended to the Dricon range, which works on
the same principle but applied to condensing refrigerants like freon
and ammonia. Muller Dricon units offer far superior energy efficiency
over equivalent air-cooled systems because the performance is dependent
on ambient wet bulb temperature, not dry bulb temperature as is the
case with air cooled condensers.
Muller 3C units comprise: -
- Two vertical finned tube heat exchanger coils
- Two sets of evaporative precooling pads
- Bank of low noise axial flow fans
- Water distribution system for air precooling consisting of:
- water circulation pump
- water make-up solenoid
- motorised dump valve (with spring
return)
- Programmable Logic Controller (PLC)
1. Heat Exchanger Coils
Standard coils are manufactured from copper tubes/aluminium fins.
The tubes are mechanically expanded into collared holes in the fins to
ensure proper mechanical and thermal bonding for effective heat
transfer. The coils are a floating tube design. An alternative tube/fin
combination is galvanised steel tubes / aluminium fins.
2. Evaporative Precooling
CeLPad Type 5090 evaporative cooling pads are sed to pre-cool the incoming air.
The Celpads cover the entire air inlet faces on both sides of the
unit, supported by water distribution trays on top and drain troughs at
the bottom.
Precooling is only activated only when ambient air temperature exceeds
the designated preset set-point (for lower ambient air temperature
pre-cooling is not necessary). Water is pumped over the pads to saturate
the pad. The system includes a dump valve, which opens daily or when pre-cooling is not required to drain all the water from the unit to
eliminate any potential.
3. Axial Flow Fans
A bank of fans on the top deck of the unit draws air through precooling
media and the heat exchangers. The fans are low speed axial flow fans
with either winglet/bionic blade design (for SH08) or wide chord blades
(for H07) to provide optimum performance and low noise.
4. PLC Controller
The PLC controller is used to control fan speed (to match cooling demand) and activate precooling function.
Following are some of the features of the controller:
- Full microprocessor control with real time clock
- Memory backup in case of power failure
- Multi-line LCD display of vital parameters and alarms
- User interface for set-point adjustments
- Analogue output for fan speed control
- Digital outputs include: CelPad pump, water dump valve and water makeup valve
- Water dump and auto dry control
- Password protection of all set-points
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