DWSC / DWDC

-Centrifugál folyadékhűtő-

Cooling          
 
Modell típus Névleges teljesítmény[kW]
Egy kompresszoros típusok
DWSC 300 - 4500
   
Duál kompresszoros típusok
DWDC 600 - 9000
  • Egy kompresszoros típusok akár 4.5MW-ig
  • Dual compressor unit on single circuit up to 9MW
  • Optional variable speed drives (VFD) for superior partload performance
  • Compressor unloading down to 5% for dual compressor units and 10% for single compressor units without hot gas bypass
  • Control flexibility for easy integration into BMS

WIDE CHOICE OF CAPACITIES AND EFFICIENCIES
Single compressor

  • DWSC: 300 kW - 4,500 kW - Approximately 1.1 million possible chiller offerings with combination options of motors, impellers, gears and vessels
Dual compressor
  • DWDC: 600 kW - 9,000 kW - Approximately 0.75 million possible chiller offerings with combination options of motors, impellers, gears and vessels

VARIABLE FREQUENCY DRIVE OPTION (VFD)
  • Inverter technology greatly improving part load efficiency
  • Reducing annual energy costs

HIGH EFFICIENCY
  • COP up to 7 at full load
  • COP up to 12 at partial load (when coupled with inverter VFD)

POWER LOSS DAMAGE PROTECTION
Power failures do not allow chillers to proceed through their normal shutdown sequence. Poor lubrication at this point can damage the bearings and reduce compressor life. The compressors are equipped with a lubricant reservoir and a piston with a compressed spring that provides pressurized lubricant to the bearings during the coast-down period. Also, the compressors decelerate quickly due to
the low inertia.

REFRIGERANT STORAGE CAPABILITY
The condensers are sized to hold the entire chiller refrigerant charge and are provided with the necessary valves to isolate this charge. This feature eliminates the need for separate storage vessels in most applications.



UNMATCHED UNLOADING

Unloading to 10% of full load for a DWSC single compressor chiller and 5% for a DWDC dual compressor unit, without using inefficient hot gas bypass. This unloading capability provides improved stability of the chilled water temperature and less harmful cycling of compressors. Movable discharge diffuser increases stability and reduces vibrations.


LOW OPERATIONAL SOUND LEVEL

Liquid Injection
A small amount of liquid refrigerant is taken from the condenser and injected into the compressor discharge area. The liquid droplets absorb sound energy and reduce the compressor’s overall operational sound level. The droplets evaporate and reduce discharge superheat.

Quieter as chiller unloads

Daikin.s design results in a reduction in sound levels at lower loads, where most chillers spend most of
their operating hours.


ONE D-DWDC DUAL COMPRESSOR CHILLER VERSUS TWO SINGLE

COMPRESSOR CHILLERS
  • Lower equipment costs than two separate chillers
  • Lower installation cost than two separate chillers
  • Lower annual operating cost than either one large or two small chillers
  • Less equipment room space required than for two separate chillers (smaller footprint)
  • Capacity reduction to 5% of design value
  • Standby redundancy for most of the cooling season options of motors, impellers, gears and vessels

EXCELLENT PART LOAD EFFICIENCY
When one compressor is running, it is able to utilize the heat transfer area of the entire chiller, twice the amount found on a single
compressor chiller. This huge amount of surface provides exceptional part load efficiency. The addition of VFDs to the dual compressor
chiller produces a very high ARI certified Integrated Part Load Value (IPLV).

PARTIAL LOADS EFFICIENCY FOR 2,000 kW CENTRIFUGAL UNIT

DWSC: single compressor
DWDC: double compressor
VFD: compressor inverter

Specific selections can vary up or down from this example.

 

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