102

WDCWATER COOLED CHILLER WITH DUAL CENTRIFUGAL COMPRESSOR

OPTIONS ON REQUEST

Start-/ Frequency drive via:- Soft starter- Frequency drive- Star-/ Delta StartMarine water box(es) provides an easy tube accesFlange and mating flange on the evaporator and condenserVictaulic connectionsThickness of heatexchanger tubing from 0,64 bis 0,89 mmWorking pressure of the vessels from 10 to 20 bar (10 bar standard)Flow protectionEvaporator insulation between 13mm and 38 mm. (13mm Standard)Compressor motor starter as separate stand alone unit of factory mountedModem for the transmission of all machine datas for monitoringMonitor software for the transmission of all machine datas to a PCExport packaging in container (standard in plastic wrap)Refrigerant pump out unit including tank for the storeage of the complete refrigerant chargeRefrigerant leak monitoring systemSound reduction kitWitness test of the machine on the test stand in the manufacturing facility

GENERAL CHARACTERISTICS

Cooling capacity up to 9485 kW, per unit.Back-up with at least 60% of the chiller design capacity.Steppless capacity control from 5-100%.High efficiency, partial loads - COP up to 12.Less equipment room space for huge cooling capacity.Operating power optimizied.Semi-hermetic; centrifugal compressorFlooded, shell and tube evaporatorShell and tube condenserThermostatic expansion- and pilot valveControl box with main power switchSafe refrigerant R134a ozone friendlyVariable speed pumpingHydraulic driven discharge diffuserPower loss damage protectionUnit controller and operator interface touch screenEasy to integrate into your building automation system such as BACnet, Modbus, LON, TCP/IP und web.Extensive optional equipment available

Cooling capacity: 1120 kW ÷ 9485 kW

WATER CO

OLED

CHILLERS

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WDCWATER COOLED CHILLER WITH DUAL CENTRIFUGAL COMPRESSOR

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TECHNICAL DATA WDC - cooling only

Range of Capacity1

* Cooling Capacity 1

Unit Power Input 1

Running Amperes 2

COP4

Stepless Capacity Control

Sound Pressure Level3

Compressor

Quantity

Refrigerant

Circuits Number

Condenser

Quantity

Water Volume

Pressure Drop

Water Connections Size

Evaporator

Quantity

Water Volume

Pressure Drop

Water Connections Size

Standard Voltage

kW

kW

kW

A

--

%

dB(A)

Type

Nr

Type

Nr

Type

Nr

l

kPa

mm

Type

Nr

l

kPa

--

V/ph/Hz

063

1.120 - 2.100

1.600

257,4

223

6,22

5 - 100

75

2

1

1

1251

16,2

304,8

1

918

24,2

304,8

WDC

1.500 - 2.800

2.400

374,7

335

6,41

5 - 100

77

2

1

1

1797

17,2

355,6

1

1313

19,1

355,6

079

1.800 - 4.420

3.400

515,5

429

6,60

5 - 100

79

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2

R134a

1

1

1797

25,0

355,6

1

1313

35,6

355,6

087

4.200 - 5.950

5.000

743,8

605

6,72

5- 100

80

2

1

1

3265

37,6

457,2

1

2503

54,4

457,2

100

4.900 - 6.700

6.500

1011,3

821

6,43

5 - 100

79

2

1

1

3265

66,8

457,2

1

2503

87,1

457,2

113

Shell and Tube

Shell and Tube - Flooded

400V / 3ph / 50Hz

5.600 - 9.485

8.400

1343,2

1129

6,25

5 - 100

78

2

1

1

3265

104,8

457,2

1

2503

137,6

457,2

126

NOTES:(1) 12/7°C entering/leaving evaporator water temperature; 30/35°C entering/leaving condenser water temperature.(2) Running Current at 12/7°C entering/leaving evaporator water temperature; 30/35°C entering/leaving condenser water temperature.(3) At 5m, according to ISO 3744, at free field semispherical conditions.(4) A Higher COP - value can be realized through larger heat exchanger surface(*) Example selection

Weight and dimensions

Shipping weight

Operating weight

(A) Length

(B) Width

(C) Height

kg

kg

mm

mm

mm

063

12604

14082

5685

1896

2686

079

20189

23364

5698

2343

2530

087

20189

23364

5698

2343

2530

113

29921

35243

7010

2648

2810

29921

35243

7010

2648

2810

126100

29921

35243

7010

2648

2810

NOTES:Weight and dimensions refer to the example selection

authorized McQuay distributor

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aircool / McQuay reserves the right to make changes in design and construction at anytime without notice

POWER LOSSDAMAGE 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.

Moveable diffuser closing off impeller discharge area

Piston

Lubrificant reservoir

98

WSC - WDCWATER COOLED CHILLERS WITH CENTRIFUGAL COMPRESSORS

WATER CO

OLED

CHILLERS

UNMATCHED UNLOADING

Unloading to 10% of full load for a WSC single compressor chiller and 5% for a WDC 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.

VARIABLE FREQUENCYDRIVE OPTION

Improves part load efficiency.Reduces annual energy costs.

HIGH EFFICIENCY

• Full load - COP up to 7• Partial loads - COP up to 12 (with inverter)

REFRIGERANTSTORAGE 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.

WIDE CHOICE OF CAPACITIES AND EFFICIENCIES

Single compressorWSC: 300 kW ÷ 4500 kW - Approximately 1,1 million possible chiller offerings with combination options of motors, impellers, gears and vessels.Dual compressorWDC: 600 kW ÷ 9000 kW - Approximately 0,75 million possible chiller offerings with combination options of motors, impellers, gears and vessels.

QUIET OPERATION

Liquid InjectionA 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 sound level. The droplets evaporate and reduce discharge superheat.Quieter as chiller unloads McQuay’s design results in a reduction in sound levels at lower loads, where most chillers spend most of their operating hours.

authorized McQuay distributor

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WSC - WDCWATER COOLED CHILLERS WITH CENTRIFUGAL COMPRESSORS

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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 an astonishing ARI certified IPLV.

PARTIAL LOADS EFFICIENCY FOR 2000 KW CENTRIFUGAL UNIT

ONE WDC 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• Capacity reduction to 5% of design value• Standby redundancy for most of the cooling seasonoptions of motors, impellers, gears and vessels. THE REDUNDANCY FEATURE

McQuay dual centrifugal chillers have two of everything, connected to a common evaporator and condenser - two compressors, two lubrication systems, two control systems, two starters. If any component on a compressor system fails, the component can be removed or repaired without shutting down the other compressor; providing an automatic back-up with at least 60 percent of the chiller design capacity available. In the unlikely event of a motor burnout, the chiller refrigerant charge will not be contaminated.

0,0

1,0

2,0

3,0

4,0

5,0

6,0

7,0

8,0

9,0

10,0

WSC WDC WSC-VFD WDC-VFD

7,0 7,4 9,7 10,0

IPLV

WCS: single compressorWDC: double compressorVFD: compressor inverterSpecific selections can vary up or down from this example.

authorized McQuay distributor

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