LG HVAC SOLUTION WATER COOLED SCREW CHILLER
LG HVAC SOLUTIONWATER COOLEDSCREW CHILLER
NomenclatureR : Korea (R134a)M : China (R134a)W: Water-cooled(Cooling only)Nominal ton:100RT 010380RT 038R C W W 030C: atureLine up & IntroductionEquipment overviewControlAccessories and optionsSpecificationPerformance dataElectrical dataOutline drawingFoundationPiping diagramControl wiringPower wiringGuide specification02 2015 LG Water Cooled ScrewW: ScrewcompressorA: Flooded typeC: Falling film typeWater working pressure:A: Chilled water : 10kgf/cm²GCooling water : 10kgf/cm²GB: Chilled water : 16kgf/cm²GCooling water : 16kgf/cm²GC: Chilled water : 20kgf/cm²GCooling water : 20kgf/cm²GA A 1 ANumber ofcompressorsDevelopmentsequence
Line upIntroductionLine TR-134a364RT* The above range is based on the nominal tonnage.LG’s latest Water cooled screw chiller offers excellent operational efficiencythanks to the company’s advanced technologies and unrivalled air conditioningexpertise. The new model’s advanced capacity control system valve help toimprove performance and efficiency. LG’s proprietary PID (Proportional, Integral,Differential control), which controls hydraulic-head loss rate, helps to minimizeenergy loss even further. High-performance compressor manufactured by specializedmanufacturer is adopted to ensure that the chiller iseconomical and durable with low vibration and low noise. Highly integrated motherboard is adopted and hence thefunction is strong and reliable. Advanced control algorithm is adopted to control chiller inadvance and hence avoid frequent stoppage protection of chiller. We have set complete safety protection function in order tomake chiller safely and reliably run. The linkage control and remote monitoring function ofperipheral equipment ensure that the chiller can run safelyand the operation and monitoring are convenient. The selection of excellent raw materials and fittings is the keyto guaranteeing chiller quality.High efficiency, High reliabilityThe RCWW & MCWW series is a kind of water-cooled sprayscrew chiller produced by LGE Corporation. Because of thespecial structure design, the chiller has high efficiency andhigh reliability.Optimized dedicated motorR134a with high efficiencyMade of premium grade, low-loss core steel with the specialslot design, the motors of R134a dedicated compressorscan gain the highest efficiency with low power consumption.Besides, different winding for specific voltage and frequencyrequirement contributes to the best power factor andexcellent performance.Constructional design ofdedicated screw compressorThe screw compressor is characterized by a very compactdesign. Most of inner dimensions have been totally modifiedconsidering displacement volume, size of compressionchamber, length & profile of rotors, oil separator specificationand oil piping rearrangement, etc. to ensure consistency andcost effectiveness of the compressor.Compressor Semi-hermetical twin-rotor screw compressor. Direct-drive, low speed/RPM for high efficiency and high reliability. Only three moving parts, resulting in high reliability withsimple solution. Field serviceable compressor and easy maintenance. Precise rotor tip clearance. The world’s advanced patent screw tooth with low noise,smooth operation long life advantages. A refrigerant dispersing cooling device is set internally forcompressor cooling, which uses return-refrigerant cooling. Years of research and testing. The LG screw chiller hasamassed thousands of hours of testing, and conditions2015 LG HVAC Solution 03
FeaturesEquipment overviewbeyond normal air conditioning applications.Unit performance testingLG began promoting factory performance tests for air-cooledchillers and water-cooled chillers, to show we stand behind theproducts we design and build.The benefits of a performance test include verification of performance, prevention of operational problems, and assurance of asmooth start-up.Only a performance test conducted in a laboratory or laboratorygrade facility will confirm both performance and operation of aspecific chiller.Mostly factory performance tests go smoothly. If a problemoccurs, LG personnel easily correct them and chiller is shippedto job site.When a factory performance test is requested, the test can beconducted at the specified, design conditions. The test facilityhas the capability to control ambient test conditions to assureour customers that our chillers will perform as predicted.AHRI certification programand standards and codesChillers conform to the following Standards and Codes: AHRI 550/590 - water chillingpackages using the vaporcompression cycle. ANSI/ASHRAE 34 -number designation and safetyclassification of refrigerants. ASME Section VIII (Option) - boiler and pressure vessel. GB/T 18430.1 - water chilling (heat pump) packages using thevapor compression cycle - part 1: water chilling (heat pump)packages for industrial & commercial and similar applications.(This code is only applied to product manufactured in China)Equipment Overviewoil pressure differential switch and other accessories. Thecomplete accessories and their new designs guarantee thecompressor has the best reliability, longest bearing life duringheavy duty running and strict operating conditions.The slide valve for capacity control is located in the compressorchamber. The slide valve is actuated by injection of pressurizedoil into the cylinder from the oil sump as well as bypass ofoil through solenoid valves in each oil lines with pressuredifferential.The screw compressors are equipped with either 3-step/4step capacity control system or continuous (stepless) capacitycontrol system. Both of the capacity control systems consistof a modulation slide valve, piston rod, cylinder, piston andpiston rings. The slide valve and the piston are connected by apiston rod. The principle of operation is using the oil pressureto drive the piston in the cylinder. The lubrication oil flows fromthe oil sump through the oil filter cartridge and capillary thenfills into the cylinder due to the positive oil pressure biggerthan the right side of spring force plus the high pressuregas. The positive pressure differential causes the piston tomove toward the right side in the cylinder. When the slidevalve moves toward the right side, the effective compressionvolume in the compression chamber increases. This means thedisplacement of refrigerant gas also increases, as a result therefrigeration capacity also increases.However, when any of the step solenoid valve (for 4-stepcapacity control system) is opened, the high pressure oil in thecylinder bypasses to the suction port, which causes the pistonand the slide valve to move toward the left side, and thensome of the refrigerant gas bypasses from the compressionchamber back to the suction end. As a result, the refrigerationcapacity decreases because of the reduction of displacementof refrigerant gas flowing in the system. The piston springis used to push the piston back to its original position, i.e.minimum load position in order to reduce the starting currentfor the next starting.Semi-hermetic twin compressorThe semi-hermetic screw compressor is developed especiallyfor applications in air-conditioning and refrigeration. With highoperating load design, each compressor is of high efficiencyand reliability in all operating conditions. Each compressor hasthe latest and advanced 5-to-6 Patented Screw Rotor Profiledesigned to ensure high capacity and efficiency in all operatingconditions.The compressor is equipped with separated radial and axialbearings, liquid injection and economizer connection, PTCmotor temperature thermistors and discharge temperaturethermistors, a motor protector, and oil level switch and04 2015 LG Water Cooled Screw4-steps capacity control
FeaturesEquipment overviewNoComponentNoComponent1Suction filter10Lubricant2Gas in (low pressure)11Oil separator catridge3Motor12Gas out(high pressure without oil)4Oil filter catridge13Capillary5Suction bearings14Solenold valve, SV26Male rotor15Solenold valve, SV17Discharge bearings16Orifice8Oil separator baffle17Slide valve9Gas out (high pressure with oil)tube sheets and copper heat exchange tubes. Removable steelwater boxes at both ends of the cooler allow tube cleaningwithout disturbing the refrigerant circuit.Tubes are mechanically expanded into tube sheets with doublegrooves to ensure leak tight and trouble free operation.Multiple compressor/ circuit chillers have coolers with separaterefrigeration circuits for each compressor.Each refrigeration circuit is provided with its own pressurerelief valve. All chillers are fitted with drain valves on theremovable heads and shell. All coolers are factory insulatedwith 19mm of closed cell expanded synthetic rubber with alljoints vapor sealed.Expansion deviceExpansion unit consists of butterfly valve and orifice. At 100%load situation, the pressure loss at the orifice is smaller thanthe refrigerant pressure loss in the condenser, thus the supercooled refrigerant passes through the orifice.At this stage the maximum amount of refrigerant is flowinginto the evaporator. As the load reduces gradually, thecirculating amount of refrigerant also reduces and accordinglythe refrigerant level in the condenser is getting low.Step-less capacity controlNoComponentNoComponent1Suction filter10Lubricant2Gas in (low pressure)11Oil separator demister3Motor12Gas out (high pressure without oil)4Oil filter catridge13Capillary5Suction bearings14Solenold valve (min. %),SV 25% / 33%6Male rotor15Solenold valve(50% of full load), SV 50%7Discharge bearings16Solenold valve (75% / 66% offull load), SV 75% / 66%8Oil separator baffle17Slide valve9Gas out (high pressure with oil)*For RC2-100, 140 & 180 the SV50% omittedHeat exchangerEvaporatorFalling film type“Falling film” shell and tube type evaporator having refrigerantin the shell and chilled water inside the tubes.Advantage of this type evaporator is higher heat transferperformance and reduced refrigerant charge.Distributer located on the top side of inside shell makesuniform flow of refrigerant, this refrigerant flows downwardby gravity as a continuous film.The shell is of welded carbon steel construction with steelWhen the amount of liquid refrigerant reduces, the gasamount in the orifice is getting larger, raising the resistancethus controlling the flow rate.ControlControl Panel LayoutFunctionHMI with 7 inch Color LCD is composed as a graphic type. Thereare start/stop, control valve 2 and Compressor 2, compressor,lead/lag lamp, and chilled water / coolant flow lamp keys.There are ‘function keys’ at the bottom of the screen thatchange according to the current screen to be able to accesslower categories.The Display of screw chiller's control unit consists of; basic screenwhere present operation can be checked, and main menu whichuser can use conveniently for user setting, problem/warninginformation check, and system menu which is for sensor settingand system pertain item setting.2015 LG HVAC Solution 05
FeaturesControlthe high reliability chiller operation using LG's unique optimumcontrol algorithm.LCD ScreenMenu operationkeyRun/StopkeyAlarm lampFlow control valvemaual operationkeyStatusindicatorlampCompressor 2run stop keyInterlockoperation manualoperation keyController front viewNames of operation unitNameDescriptionLCD screenIt is the color LCD(Liquid Crystal Display) showing operationinformation and status as in text(Korean, English, Chinese) oranimation graphic.Menuoperation keyIt is the key to operate menu displayed on the LCD, such as,selection of the displaying screen or setting of operationcondition, etc. The functions of the oepration keys are isdisplayed at the bottom of the LCD screen, and the functhionsof the operation key changes as with the screens selected.Flow controlvalve manualoperation keyIt is the key to operate(open/close) the solenoid valvemanually. When "Valve manual" indicator lamp is on, it is thestate where that manual operation is possible. Open/close keyoperates only when the key is pressed down.Interlockcontrol manualoperation keyIt is the key to Run/Stop interlock control manually. When"interlock control status" indicator lamp is off, it is the statethat manual operation is possible, and it starts to operatewhen it is pressed down for about 1.5 seconds or longer.Alarm lampWhen a problem or caution warning occurs the alram lamp isturned on. When the alarm lamp is on, the message on aboutthe alarm is displayed on the message display line tin the LCDscreen. At this time, therealease key shows up and buzzer willsounds. If you press the release ky at this time, the buzzerwill stop and the release key will disappears. And when theproblem alarm disappears, the message will also disappears.Run/Stop keyIt is the key to Run/Stop the chiller. It works when you press itdown for about 1.5 seconds or longer, and run indicator lampis on during running, and stop indicator lamp is on when it isstopped.Compressor 2Run/Stop keyIt is used when 2 compressors are operated. It is the key toRun/Stop the second compressor. In the product where 2compressors are installed, it is used as the Run/Stop key ofthe compressor 2. It displays the Run/Stop status of the chillerand devices attached to the chiller and as well as status of thechilled water, cooling water, and flow rate. The indicator lampis on when it is operated.Features of control unitThe Control unit of LG chiller controls temperature, pressure,flow rate, current, voltage, power and capacity control valveusing high capacity microprocessor. It is constructed to provide06 2015 LG Water Cooled ScrewOur controller unit has the following features.1. 7 inch Color wide LCD Display (800x480 Graphic)2. R emote operation/stop function which allows the chiller tobe operated remotely.3. Scheduled operaton function which allows setting theoperation time period in holiday and weekdays.4. Soft loading function for the low load startup5. Various preventive control function for preventing overload,condenser high pressure, evaporator low pressure, surge, etc.6. Advanced control function for the optimum control7. Improved control function to protect the chiller8. Self diagnosis function for easy checking of abnormal situation9. Help function describing actions to take when problem occurs10. O peration data and operaton status (error and controlaction) saving function11. Automatic sensor setting function to set the sensorsautomatically (set by software)12. Automatic repeat key function for setting values easily13. Modbus protocol communication function for remotesurveillance control- RS485: Standard installation- BACnet & RS232C: Optional14. Graphictrend function showing the chilled water outlettemperature and operation current change in real time.15. Print function for printing operation or problem data(Optional)16. Cooling tower fan control function for keeping stablecooling water temperature17. Interlock check function for checking peripherals andmalfunction18. Time display function showing number of operations andtotal run time of the pump and motor which are attachedto main body.Controller system composition diagramMaster, slave, HMI, Relay board communicates with RS485, andin one master/slave board, there are analog input (temp. 12channel, current 10 channel), analog output (current 4 channel),digital input (20 channel), digital output (16 channel). Relayboard controls Solenoid valve in 2 comp.BMS support functionScrew chiller’s basic communication protocol is Modbus protocol,and it is compatible with the higher level communication methods.Communication protocol support Communication method- Basic: RS-485, Ethernet(Optional) Protocol- Basic: MODBUS
FeaturesControl- Option: BACnet, TCP/IPRS485Multi-DropTCP/IPRS485ConverterSerial to LANconverterProtocolconverterProvide equipment with power factor correction capacitors asrequired to maintain a displacement power factor of 95% at allload conditions.NFB (Non-Fused Breaker)power disconnect switchA non-fused disconnect is available as a factory-installed optionfor all units with single point power connection units. Thisoption is that power supply is disconnected during service &repair work as well as door interlock.Connecting to max 8 unitsThe chillers can be managed up to 255 units when using communication of RS485 or TCP/IP.Detailed diagrams of BMSSuction service isolation valveService suction isolation valve is installed with unit for eachrefrigerant circuit as a standard.Accessories and optionsCompressor acoustic enclosureThe compressor acoustic enclosure can be provided as anoption to reduce compressor sound levels. This enclosure isconstructed of painted panels and sound absorbing insulationfor maximum sound attenuation.The panels and the sound foam, provide sound dampingeffect. This panel fastened with bolt for service The enclosureis factory installed option.Evaporator optionsDouble thickness insulationAs a standard, the evaporator shell is insulated with 3/4”(19mm).As an option, it can be insulated with 1-1/2” (38mm).General optionsFlow switch accessoryWater flow detection switch is should be installed to detectwater flow. The water flow switch comes with SPDT(SinglePole Double Throw) output function, 1.6MPa (232 psi) workingpressure, -10 C to 120 C (-14 F to 248 F) with 1” NPTconnection for upright mounting in horizontal pipe (This flowswitch or equivalent must be furnished with each unit). Fieldmounted.Vibration isolationFor installation on building roofs or in sensitive noise areas(hospitals, studios and some residential areas) pre-selectedspring type isolators with 1” or 2” deflection are available as afactory option – shipped loose part for field installation.Power factor correction2015 LG HVAC Solution 07
FeaturesAccessories and optionsCategoryRefrigerantOptional listStandardOptionRemark Factory chargingLeaving chilled water 5 15 CEntering cooling water 18 35 CModbus Operation temperatureBMS Interface BACnetHigher pressure water side construction (150psig) Higher pressure water side construction (300psig)Heat exchangersFlange Exclude counter flangeVictaulic ASME pressure vessel codes certification Compressor acoustic enclosure Double thickness insulation Step-less control Soft starter InsulationsSuction service isolation valveOthers Single power point connection NFB (Non-Fused Breaker) power disconnect switch Power factor correction Spring isolator Flow switch (Pedal type) Flow switch (Differential pressure switch) 08 2015 LG Water Cooled ScrewExclude coupling
Specification60HzR134a (60Hz)ModelStandardConditionCooling capacityInput PowerCOPCooling capacityAHRIConditionsGeneral ionInput PowerCOPIPLVNumber of CircuitsRefrigerant,R-134aOil ChargeShipping WeightOperating WeightCompressor typeQuantityEvaporator typeWater VolumeMax. WaterPressureMax. RefrigerantPressureMin. Cooling WaterFlow RateMax. CoolingWater Flow RateWater ConnectionsEvaporator typeWater VolumeMax. WaterPressureMax. RefrigerantPressureMin. Chilled WaterFlow RateMax. Chilled WaterFlow RateWater 1A RCWW010CA1A RCWW011CA1A RCWW012CA1A RCWW014CA1A RCWW016CA1A RCWW018CA1A 92kg70809010012014016080 / 603,310283,1803,46016 / 7100125Shell and 8.410.111.212.611.2ℓ/s22.3
04 2015 LG Water Cooled Screw Equipment overview beyond normal air conditioning applications. Unit performance testing LG began promoting factory performance tests for air-cooled chillers and water-cooled chillers, to show we stand behind the products we design and build. The benefits of a performance test include verification of perfor-
Maximum Series portable chillers can be used on a variety of process applications that require 20 F to 80 F chilled water. MAXIMUM SERIES † Air & Water-Cooled † 1/4 to 40 Tons † 20 F to 80 F † Using Non-Ozone Depleting Refrigerants 10 ton air-cooled model 10 ton water-cooled model 2 ton water-cooled model 1 ton air-cooled model
air-cooled, water cooled and split systems scroll, screw, or oil free centrifugal compressors precise capacity control & redundancy tanks, pumps and free-cooling modules advanced microprocessor controls highest quality modular chillers air & water cooled chillers for hvac & process cooling. 2
hvac piping abbreviations hvac piping symbols hvac symbols hvac electrical symbols sheet metal general notes hvac piping general notes project general notes all starters, disconnect switches, motor control centers, and variable frequency drives, for equipment provided under division 23, shall be furnished under
AIR-COOLED Air-Cooled chillers utilize plant ambient air to extract heat from the refrigeration circuit. Fan or blowers move the plant air across generously sized finned condenser coils to permit full rated capacity at design conditions. WATER-COOLED Water-Cooled chillers utilize a secondary plant water source such as cooling tower or city .
cause water-cooled chillers can take advantage of lower condensing temperatures than air-cooled chillers. Air-cooled chillers have a full load kW/ton of approxi-mately 1.25 while water-cooled chillers have a full load kW/ton of between 0.55 and 0.8 kW/ton. The kW draw of the cooling tower fans and con-denser water pump should be
Water cooled W 220-240V, 50Hz 2 Inverter H-Q Water cooled 0 0 1 2 R132 C Earth source E 115-220V, 50/60Hz 3 DC inverter R-Z Earth source R134A D 220-220V, 60Hz 4 Air-cooled module chiller A R410A E 110V, 50-60Hz 5 Light chiller Split-packaged H Cooling only R22 M 220V, 50-60Hz 6 Single-packaged R R407C N 127V, 60Hz 7 Water-cooled cabinet .
EWY Air-cooled chiller, heat pump EWL Remote condenser chiller ERA Air cooled condensing unit EWW Water-cooled chiller, cooling only EWC Air-cooled chiller, cooling only with centrifugal fan EWT Air-cooled chiller, cooling only with heat recovery Refrigerant D R-134a P R-407c Q R-410a Capacity class in kW (Cooling) Always 3 .
INTRODUCTION TO OPENFOAM open Field Operation And Manipulation C libraries Name. INTRODUCTION TO OPENFOAM open Field Operation And Manipulation C libraries Rita F. Carvalho, MARE, Department of Civil Engineering, University of Coimbra, Portugal OpenFOAM Equations Solvers How to use/code Examples Conclusions 3 25 26 33 46 49 50. SOLVE PARTIAL DIFFERENTIAL EQUATIONS (PDE .
