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McQuay InternationalWMCNew Water Cooled Chiller with oil free centrifugal compressors Applied Systems - Strategic Marketing

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Contents

2. Technical Features2.1 Features & benefits2.2 Range2.3 Oil-free compressor with magnetic bearings2.4 Electronic expansion valve2.5 P & I diagram – example: 1 compressor case2.6 Control Panel

1. Introducing WMC 1.1 Product Overview 2010 1.2 Range

3. Focus on the Range3.1 Product line-up3.2 Selection Software3.3 Operating Limits3.4 Dimensions & Weights3.5 Sound Levels3.6 Standard Options3.7 Options on request

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Chapter 1---------------------------------

Introducing WMC

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1.1 Product Overview 2010

50 100 250 500 750 1000 1250 1500Cooling Capacity

2000kW1 circuit2 circuits

3 circuits4 circuits

WSC/WDC (Centrifugal Chiller)

PFS (Flooded Technology)

Ecoplus SE / XE

(WDC up to 9.000 kW)

300

165 604

369 1050

333 1510

362 1134

R-1

34a WHS-E SE

WHS E XE

Proximus Evolution SE / XE(up to 2196 kW)

388

R-4

10A

(WSC up to 4.500 kW)

317

(WMC up to 1.048 kW)WMC (Frictionless Centrifugal Chiller)

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1.2 Range

Product Water cooled chiller with oil free centrifugal compressor

Refrigerant R-134a

Series name WMC

Cooling Capacity From 317 kW to 1.048 kW (nominal cooling capacity) - 6 sizes (Referred to: water evaporator 12/7°C --- water condenser 30/35°C)

Circuits 1 refrigerant circuit (1 or 2 compressors)

Efficiency versions XE High efficiency

Sound Versions ST Standard sound

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Chapter 2---------------------------------

Technical Features

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2.1 Features & benefits

Onboard sophisticated digital electronics to provide smart control

Extensive option list to meet Customer requirements

Breakthrough energy efficiency (especially at partial loads), resulting in great energy savings and fast payback

Totally oil-free operation, resulting in reduced maintenance and increased reliability

Compact design and Light Weight, for example to ease retrofit applications

Easy integration with BMS (Building Management Systems)

Low Noise Level, ideal for sound sensitive environments as libraries, schools,…

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2.2 Nomenclature

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Machine typeWMC = Oil Free Centrifugal Chiller

Model seriesLetter A,B,…: major modification

Efficiency levelXE = Standard Efficiency

Unit size100 ÷ 300Always 3-digit code

Number of compressorsS = 1 D = 2

Noise configurationST = Standard Noise

WMC -A XE 100 S ST

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2.3 Oil-free compressor with magnetic bearings

The compressor, specifically designed for HVACR industry, is a compact FULLY INTEGRATED SYSTEM including:

- Dual stage Centrifugal compressor

- Magnetic bearing system (instead of conventional bearings)

- Variable Speed Permanent Magnet Direct Drive Motor

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The compressor’s one moving part (rotor shaft and impellers) is directly put in rotation by the permanent magnet direct drive motor and kept levitated by a digitally controlled magnetic bearing system; the speed of rotation reduces as the condensing temperature and/or cooling load reduces. Movable inlet guide vanes (activated by a step motor) redirect gas flow into the first stage after the compressor has reached minimum speed.

2.3 Oil-free compressor with magnetic bearings

Pressure and temperature sensors

Inverter speed control

Permanent Magnet

Direct Drive Motor

Motor and bearing control(the electronics)

Inlet Guide Vanes

2 stage centrifugal compressor

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2.3 Oil-free compressor with magnetic bearings

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The shaft / impeller

• Different types for different compressor sizes

• It is the only moving part of the compressor

TT300

TT350

TT400

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How the magnetic bearing system works:

• The rotor shaft’s position is held by front and rear electro-magnetic bearings

• The shafts position is monitored with 10 sensors that send a signal to a digital controller which then sends a command to the 5 separate pulse width modulators (PWM), for a proper shaft repositioning

• In case of power failure, within 0.5 micro-seconds, the motor becomes a generator for the magnetic bearings and the compressor comes gradually to a complete stop; the rotor de-levitates normally unto backup bearings. Onboard capacitors have enough power to fully support the bearing system during the coast down

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2.3 Oil-free compressor with magnetic bearings

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Efficiency versionsavailable

Compressor cabinet

Variable Speed Permanent Magnet Direct Drive Motor

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• Permanent magnet, placed onto the rotor, generate the magnetic flux that is necessary to provide torque; VFD (Variable Speed Drive) is required to allow a soft start (2 amps starting current) and the variability of speed (high speed, from 18,000 to 48,000 RPM).

• This motor, also known as ‘brushless’, is synchronous and is more efficient than the asynchronous because there are no losses into the rotor (as happens in the asynchronous motor to slip the frequency)

• The motor is refrigerant cooled and fully protected with thermistors.

2.3 Oil-free compressor with magnetic bearings

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2.3 Oil-free compressor with magnetic bearings

Case 1 :

Asynchronous

Case 2 :

Synchronous with permanent

magnets

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2.3 Oil-free compressor with magnetic bearings

The Magnetic bearings

The magnetic bearings (180W - 300V dc supply) are used in place of traditional cushions with below purposes/advantages:

• Avoid high mechanical friction losses

• Avoid heat transfer losses due to oil

• Eliminate the issues due to oil management systems (controls and hardware)

• Long lifetime

Modern magnetic bearing system along with the integrated VFD enables outstanding energy efficiency especially at partial loads where significant gains can be realized.

Also the inrush current is strongly reduced thanks to the use of VFD, resulting in an advantageous down-sizing of electrical protection devices.

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2.3 Oil-free compressor with magnetic bearings

The electronics

Inbuilt sophisticated electronics guarantee self-diagnostics on Motor, bearings, compressor, expansion valve, performance, events, faults,…and allow the exchange and visibility of data with the chiller controller

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2.3 Oil-free compressor with magnetic bearingsThe electronics

Line reactor Rectifier MotorDC-link capacitorsIGBT

Compressor controller

DC-DC converter PWM output

Magnetic bearings

Controller

ControlPower - GeneratorPower - Motor

Supply

3 Phases

380-480V

50-60HZ

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2.4 Electronic expansion valve

The unit is equipped with the most advanced electronic expansion valves to achieve precise control of refrigerant mass flow.

These valves, that typically work with a lower Δp between high and low pressure side than a thermostatic valve, allow the system to work

• within a wide operating range without any refrigerant flow problems

• with a perfect chilled water leaving temperature

Finally this type of valve allows the double set-point and generally the application as heat pump: this last point is not true for the WMC due to the envelope of the compressor (see also slide on ‘Operating limits’ )

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2.5 P & I diagram – example: 1 compressor case

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2.6 Control Panel

The power panel (high voltage side) is fitted with main switch interlocked door

Power section includes compressor fuses and control circuit transformer

Control and Power are locatedin two sections of the main panel.Panel is IP54 internally protected against accidental contact (IP20)

Control Power

High Voltage sideLow Voltageside

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Chapter 3---------------------------------

Focus on the range

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3.1 Product line-up

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Oil free centrifugal chillers provide (at fixed evaporator and condenser water conditions) different cooling

capacities, EER’s, sound levels, pressure drops, etc. this depending on the compressor speed of rotation.

TECHNICAL SPECIFICATIONS 100S 125S 150S 200D 250D 300DkW 114-317 128-429 172-521 114-635 128-856 172-1048

5.40 5.40 6.00 5.40 5.50 5.908.60 8.60 9.40 8.80 8.60 9.60

Version XE - ST Cooling CapacityEER up toESEER up to

1) The indicated CC intervals refer to the full load cooling capacity at:

- minimum and maximum compressor speed

- standard working conditions (12/7°C evaporator - 30/35°C condenser)

2) For dual compressor units the minimum capacity is related to the condition with only one

compressor running

3) Maximum EER at standard conditions and a specific compressor speed

4) Maximum ESEER at specific compressor speed

0 200 400 600 800 1000 1200

Cooling capacity (kW)

100S125S

150S200D

250D

300D

WMC range

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3.2 Selection Software• The WMC selection software is basically a excel-based tool, very easy and intuitive.

• To access the software the user is required to enter ‘username’ and ‘password’ (provided by Strategic Marketing)

• Calculations of IPLV, ESEER and NPLV are allowed, providing for each point all the most important technical parameters as water flow, pressure drops, capacity, power input, etc

• Once generated, selections can be easily saved, archived and/or sent by e-mail.

• A dedicated selection software short guide is available to show how to use the tool.

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3.3 Operating Limits

0

5

10

15

20

25

30

35

40

45

50

0 2 4 6 8 10 12 14 16

Evaporator Leaving  Water Temp.  (°C)

Cond

enser Leaving Water  Tem

p. (°C)

Operation with Glycol(below 4°C Evap LWT)

Above diagram is indicative: for the operating limits of the specific models please refer to the WMC selection software.

Note - The operation with Glycol influences the unit performance: the WMC selection software is able to adjust the calculations keeping this into account

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3.3 Operating Limits

Max saturated discharge temperature: 56°C

Max saturated discharge temperature: 45°C

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3.4 Dimensions & Weights

179417481755182318231823mm(C) Height

190418531790127612761276mm(B) Width

340132893441341932543254mm(A) Length

533045484074281226342520kgOperating weight

476540953709254624162360kgShipping weight

300D250D200D150S125S100SWeight & dimensions

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Reduction to be applied to standard sound levels

The WMC chillers are very quiet, this mainly thanks to the use of oil-free Centrifugal compressor with magnetic bearings; additional reduction of sound level is possible through the sound proof cabinet (on request)

Figures in the table are related to standard working conditions (evaporator water 12/7°C and condenser water 30/35°C) and maximum cooling capacity

Sound pressure level correction for different distances

3.5 Sound Levels

Power63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz dB(A) dB(A)

100S 38.7 50.1 55.6 58.8 64.5 62.7 63.6 66.6 70.9 89.0125S 39.2 50.6 57.0 59.8 66.0 63.5 64.7 67.9 72.0 90.1150S 39.7 51.7 57.7 61.1 66.8 64.6 66.1 68.5 73.0 91.2200D 41.7 53.0 58.6 61.8 67.4 65.8 66.4 69.6 73.8 92.4250D 42.2 53.6 60.0 62.9 69.1 66.4 67.9 71.0 75.1 93.6300D 42.7 54.9 60.7 63.9 69.8 67.5 69.1 71.3 75.9 94.6

Sound pressure level at 1 m from the unit in semispheric free field (rif. 2 x 10-5 Pa)Unit size

1m 5m 10m 15m 20m 25m 50m100S 0.0 -8.7 -13.7 -16.9 -19.2 -21.1 -26.9125S 0.0 -8.7 -13.8 -17.0 -19.3 -21.1 -26.9150S 0.0 -8.7 -13.7 -16.9 -19.2 -21.0 -26.8200D 0.0 -8.4 -13.4 -16.6 -18.9 -20.7 -26.5250D 0.0 -8.5 -13.5 -16.6 -18.9 -20.7 -26.5300D 0.0 -8.4 -13.4 -16.5 -18.8 -20.6 -26.4

Unit sizeDistance

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Following accessories are supplied as Standard on basic unit:

• Evaporator – 2 passes configuration• Evaporator Victaulic kit – Hydraulic joint with gasket for an easy and quick water connection• Evaporator water side design pressure 10 bar• 20mm evaporator insulation• Condenser – 2 passes configuration• Condenser Victaulic kit – Hydraulic joint with gasket for an easy and quick water connection• Condenser water side design pressure 10 bar• Electronic expansion valve• High pressure side manometers on evaporator and condneser• Water pressure differential switch on evaporator and condenser – Factory mounted, differential switchis available to detect evaporator and condenser loss of flow• Inverter compressor starter – For low inrush current and reduced starting torque• Double pressure relief valve with diverter• Current limit – To limit maximum absorbed current of the unit whenever is required• Hour run meter• General fault contactorSet-point reset – The leaving water temperature set-point can be overwritten withthe following options: 4-20mA from external source (by user); outside ambient temperature; evaporator watetemperature Δt• Demand limit – User can limit the load of the unit by 4-20mA signal or by network system• Alarm from external device – Microprocessor is able to receive an alarm signal from an external device (pump etc…). User can decide if this alarm signal will stop or not the unit

3.6 Standard Options

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Following options are available on request:

• Evaporator and condenser 1/3 passes – availability of these configurations must be checked on the selection software• Evaporator and condenser flange kit – in place of the standard victaulic connections• Evaporator and condenser double flange kit• Evaporator and condenser marine water box (with victaulic or flanged connections). To save time and work marine water boxes cover can be easily removed to clean internal tubes without the disconnection of water pipes.• Evaporator and condenser water side design pressure 21 bar• 20mm condenser insulation• Cu-Ni 90-10 condenser tubes - To work with sea water the heat exchangers are fitted with Cu-Ni tubes and special protection inside the end covers• Evaporator/Condenser Flow switch – Supplied separately to be wired and installed on the evaporator water piping (by the customer)• Suction line shut off valve – Installed on the suction port of the compressor to facilitate maintenance operation• Energy Meter – installed inside the control box, this accessory shows on a digital display: Line-to-Line Voltage, Phase and Average Current, Active and Reactive Power, Active Energy, Frequency• Rubber type antivibration mounts – Supplied separately, these are positioned under the base of theunit during installation. Ideal to reduce the vibrations when the unit is floor mounted• Sound proof system - "integral kind“cabinet to reach the best performance in noise reduction• Witness test – at customer’s presence, in accordance with the procedures indicated on the test form

3.7 Options on request

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Thank You

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