Bock Compressors

1Bock Kältemaschinen GmbH – 09.06.2009

PRODUCT INFORMATIONRKX26 CO T2

Semi-hermetic radial piston compressor fortranscritical CO2 applications up to 130 bar

CO2 Compressor RKX26

2

2


Bock Kältemaschinen GmbH – 09.06.2009

Important Information

•TranscriticalCO2applicationsarestillinthedevelopmentphase•Theyrequireacompletelynewkindofsystemandcontrol•TheyarenotageneralsolutionforthesubstitutionofF-gases• Therefore,wewouldspecificallydrawyourattentiontothefactthatthisinformationispresentedaccording

toourcurrentlevelofknowledgeandmaychangeatanytimeduetofurtherdevelopment.Legalclaimsregardingtheaccuracyoftheinformationcannotbemadeatanytimeandarethusexpresslyexcluded

•Compressorscanonlybemadeavailableforselectedprojects•Operationandwarrantiesaresubjecttoaseparateagreement

At a Glance

Since the beginning of the 1990‘s, Bock, together with leading institutes and manufacturers, has developed compressors for transcritical CO2 systems.

In 1993 the first open CO2 compressor was created for bus air-conditioning, which was then presented to the public in a Konvekta air-conditioning system at the 1994 IAA commercial vehicles fair.

Since then, such compressors have been field-tested and form the basis of many CO2 studies by international institutes.

Semi-Hermetic radial piston compressor RKXIn 6-Cylinder Design

Bock has developed this new radial piston compressor with Obrist Engineering GmbH, who has also worked on the development of CO2 for a long time.

CO2 is a very high capacity refrigerant, so the compressor displacement needed is less than for HFC refrigerants. In addition, the RKX is a radial piston compressor, providing a very compact arrangament. It is an ideal compressor for small to medium capacities.

The compressor is a 6 cylinder machine and can be mounted vertically or horizontally. It can be used on a wide range of CO2 applications, including in single and two stage system. (potential operating pressure up to 130 bar).



SpecialFeatures

•Simpletotalconstruction,alignedtothespecialrequirementsinthetranscriticalsector•Onlytwosurfacesealsontheentirecompressor(housingcover,electricalterminalboard)•Pot-shaped,closedhousingmadeofspheroidalcastironformaximumpressurestrength•Completepowertrainintegratedinthehousing,nocylindercoverrequired•Onlyafewsmallhigh-pressurecompartments•Valveoperationaccordingtotheuniflowprinciple,thesuctiongasispushedinonedirectionthroughthepiston

and is thus compressed. There are no alternating gas movements and a minimum amount of gas pulsation•Centrifugallubricationwithintegratedoilseparation•Excellentoperatingcharacteristics–radialarrangementofsixcylindersononelevel•Welldimensioneddrivemotors,partiallysuctiongascooled,in2and

4 pole versions (1.500 and 3.000 1/min) •Suctionanddischargeconnectionsusingscrewedcuttingringjointsforsteelpipes(withoutshut-offvalves)•Safetyvalvesforthesuctionandpressurearea•ElectricalconnectionboxtoIP65withBockMP10motorprotection

TypeKey

Series 1)

Ester oil fillingSizeNumber of cylindersSwept volumeNumber of polesCO2 version Transcritical

1) RK = Radial piston

RKX26/31-4 CO T2

Type Swept volume 50 Hz[m3/h]

RKX26/31-4 CO2 T 2,7

RKX26/31-2 CO2 T 5,4

Availablemodels

4



Operating LimitsRKX26/31-2 CO T | RKX26/31-4 CO T

Notes

Oil

ThecompressorsareequippedwithBockC120E,aspecialoilfilling, which is available directly from Bock. This is a synthetic esteroilwithhighthermalloadresistance,allowinggoodmixingsolubility with CO2. It possesses a special additive, which protectsthecompressorsagainstwear,evenwhensubjectedtoextremeloads,suchasthosewhichexistinCO2systems.Thisoil can be used both in transcritical and subcritical systems.

Tem

pera

ture

Concentration Oil in CO2

Max.allowedoperatingpressure(HD): 130barMax.allowedpressureduringstandstillperiods:90barMax.alloweddischargeendtemperature: 160°C

Unlimited application range

Supplementary cooling or reduced suction gas temp. tO Evaporatingtemperature(°C)∆tOh Suction gas superheat (K)pO Suction pressure (bar)p High pressure (bar)

2 21

1 RKX26/31-4CO2T min. evaporating temperature tO=-5°C(30,4bar)

10 20 30 50

50

40

90

80

120

-50 -40 -30 -25 -20 -5

-10

-20

20

0

30

Einsatzgrenzen RKX26/31-2 CO 2 T / RKX26/31-4 CO T2

Einsatzgrenzen CO - unterkritischer Betrieb2

-45 -35 -10-15

100

70

60

40 po [bar]

p [bar]

110

10 ? t Oh

= 20 K

130

140

= 10 K Oh

? t

< 10 K Oh

? t

-25 -50-10-20-30-40 10

to [°C]

15

Bock C120EoilisrequiredforRKXapplications



Type Cooling capacity QO[W] PowerconsumptionPe[kW]

Evaporatingtemperature°C

15 10 5 0 -5

tc °C SUBCRITICAL

RKX26/31-4 CO2 T

15QP

20QP

25QP

30QP

tga °C TRANSCRITICAL

RKX26/31-4 CO2 T

30pV2 QP

35pV2 QP

40pV2 QP

45pV2 QP

50pV2 QP

•

50 HzCO2 Performance data2

Subcritical performance data 50 HzRelativeto10Ksuctiongassuperheatwithoutliquidsubcooling

Transcriticalperformancedata50HzRelative to 10 K suction gas superheat

The performance data are indicated at a high pressure level, which is close to a optimal high pressure level.Optimal high pressure is thereby related to an ideal cyclic process.

tc = Condensing temperaturetga = Gas cooler outlet temperaturepV2 = Pressure at the compressor

outlet [bar]

Optimal high pressure is outside of the operating limits. Performancedataareindicatedatmaximalpossiblehighpressure.

12900 1,85

13950 11550 1,90 2,25

14400 12050 9800 2,00 2,35 2,55

11300 9350 7600 2,45 2,70 2,85

75 75 75 75 75 14250 11950 9850 7950 6200 2,35 2,65 2,90 2,95 2,95

85 85 85 90 90 12500 10450 8600 7200 5550 2,90 3,10 3,20 3,30 3,15

100 100 100 100 105 11600 9600 7800 6150 4650 3,60 3,65 3,60 3,50 3,35

110 110 115 115 110 10050 8250 6750 5200 3800 4,00 4,00 4,05 3,85 3,45

125 125 130 125 110 9150 7500 6200 4550 2950 4,75 4,65 4,75 4,30 3,45

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Type Cooling capacity QO[W] PowerconsumptionPe[kW]

Evaporatingtemperature°C

15 10 5 0 -5 -10 -15 -20

tc °C SUBCRITICAL

RKX26/31-2 CO2 T

10QP

15QP

20QP

25QP

30QP

tga °C TRANSCRITICAL

RKX26/31-2 CO2 T

30pV2 QP

35pV2 QP

40pV2 QP

45pV2 QP

50pV2 QP

•

50 HzCO2 Performance data2

Subcritical performance data 50 HzRelativeto10Ksuctiongassuperheatwithoutliquidsubcooling

Transcriticalperformancedata50HzRelative to 10 K suction gas superheat

The performance data are indicated at a high pressure level, which is close to a optimal high pressure level.Optimal high pressure is thereby related to an ideal cyclic process.

tc = Condensing temperaturetga = Gas cooler outlet temperaturepV2 = Pressure at the compressor

outlet [bar]

Optimal high pressure is outside of the operating limits. Performancedataareindicatedatmaximalpossiblehighpressure.

20350 16600 13300 10400 4,45 4,45 4,35 4,15

22450 18500 15000 11900 9150 4,85 4,90 4,85 4,70 4,50

24000 20000 16400 13200 10300 7800 5,25 5,35 5,35 5,25 5,10 4,80

24550 20650 17100 13950 11100 8550 6300 5,70 5,80 5,80 5,75 5,65 5,45 5,10

19850 16600 13650 11000 8650 6550 4650 6,25 6,30 6,30 6,20 6,05 5,75 5,40

75 75 75 75 75 75 75 75 24600 20900 17500 14400 11600 9050 6750 4750 6,45 6,55 6,55 6,50 6,40 6,20 5,90 5,55

85 85 85 90 90 90 85 22000 18600 15450 13300 10450 7900 5550 7,20 7,20 7,15 7,30 7,10 6,80 6,25

100 100 100 100 105 95 21100 17550 14400 11500 8900 6350 8,30 8,20 8,00 7,80 7,65 6,95

110 110 115 115 110 95 18450 15300 12750 10000 7450 4050 9,00 8,80 8,80 8,45 7,85 6,95

125 125 130 125 110 16900 13900 11650 8800 5700 10,00 9,70 9,55 8,85 7,85



Explanations:

Tolerance (± 10%) relates to the mean value of the voltage range. Othervoltagesandcurrenttypesonrequest.

Takeaccountofthemax.operatingcurrent/max.power consumption when designing contactors, leads and fuses. Switches:ServicecategoryAC3

All data are based on the mean value of the voltage range.

220-240V∆/380-420VY-3-50Hz 265-290V∆/440-480VY-3-60Hz

Cutting ring connection for steel pipes

1

2

3

4

5

Technical data

Oil sump heater 110-240 V - 1 - 50/60 Hz (standard)PTCheater,50-120W,self-regulating ›

Oil sump heater is necessary due to the high CO2 solubility in the oil.

Type Number of

cylinders

Swept volume

50 / 60 Hz

Electrical data 3 Weight Connections 5 Oil charge Voltage

1

Max. working current

2

Max. power con-sumption

2

Starting current

(rotor locked)

Discharge line DV

Suction line SV

m³/h A kW A kg mm mm Ltr.∆ / Y ∆ / Y

RKX26/31-4 CO2 T 6 2,70 / 3,30 4 14,3 / 8,2 5 107 / 62 68 Max. 12 Max. 12 1,0

RKX26/31-2 CO2 T 6 5,40 / 6,50 4 40 / 23 10,6 235 / 136 73 Max. 12 Max. 12 1,0



Scope of supply

1) Also available as refill unit in 1 or 5 liter packaging

•Semi-hermetic 6 cylinder radial piston compressor with drive motor for part winding start – 2- or 4 pole version 220-240V∆/380-420VY-3-50Hz 265-290V∆/440-480VY-3-60Hz Single-section compressor housing

•WindingprotectionwithPTCresistorsensorsandelectronicmotorprotectionunitBockMP10

•Thermalprotectionthermostat(PTCthermistor)IP67

•Oilsumpheater110-240V-1-50/60Hz,50-120W—PTCheater self regulating

•Oilcharge:BockC120E1)

•Compressorsafetyvalvehigh-pressureandlow-pressureside

•Capabilityofconnectingforsuctionlineanddischargeline without shut off valves Designincuttingringversionforsteelpipes

•Inertgascharge

•4 anti-vibration pads enclosed

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Notes



Notes

12



Bock Kältemaschinen GmbHBenzstraße 7 D-72636FrickenhausenTelefon +49 7022 [email protected]

Art.Nr. 96094-06.09-GbSubjecttochangewithoutnotice

Bock Compressors

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