RTWA 108-110 - Heating and Air Conditioning …

1 RT WA 108-110 screw compressor liquid chiller, circuit Packaged unit. Nominal cooling capacity : 130 to 180 kW (R134a, 50 Hz). TRANE Helirotor screw compressor. Microprocessor based stepless capacity control. Adaptive Control providing superior operation reliability. Easy integration in a Building Management System. Electronic expansion valve. Factor y tested prior to shipment. Designed and manufactured in accordance with the TRANEQ uality Management System, approved to ISO screw compressor liquid chiller, water cooling capacities : 130 to 180 kW (R134a, 50Hz).

2 By introducing the RTWA, TRANE is now ableto offer a complete range of liquid chillers fittedwith rotary compressors covering the coolingcapacity range from 50 up to 4000 the largest cooling capacities, TRANE offersthe centrifugal compressor liquid chillers. Thesemachines have an excellent reputation for relia-bility . A survey published in the USA in 1988revealed that more than 90% of the centrifugalchillers installed during the 50 last years werestill in lower cooling capacities, TRANE has intro-duced more recently, the 3D-Scroll compressorsand the Helirotor screw these technologies still being conside-red a novelty in some quarters, within TRANE this relates to todays technology.

3 For examplethe 3D-Scroll compressors introduced in 1989have completely replaced the reciprocating com-pressors for cooling capacities up to 160 the upper range, thewater-cooled Screwcompressor liquidchillers, seriesRTHA, introducedin 1988. is a verysuccesful product: with more than1500 machinesinstalled everyyear worlwide,TRANE can beconsidered asthe Number 1 inthis area. TRANE has also introduced a range ofair cooled screw compressor liquid the type of technology, the rotarycompressors offer some very specific commonbenefits : superior energy efficiency and reliabili-ty combined with reduced sound and vibrationlevel being the most obvious : Number 1 in rotar y compressors : A combination of the latest technological innova-tions in the field of liquid RTWA offers in many areas a combinationof the most advanced technologies availabletoday.

4 - screw compressor, with stepless capacitycontrol and 5/7 lobes rotors profiles desi-gned and patented by Advanced microprocessor based "Adaptive Control" including PID leavingchilled water temperature control and aserial communication link for easy integra-tion into a Building Management Electronic expansion valve. Gives steadieroperation, optimized evaporator efficiencyand improved energy efficiency with reducedcondensing High efficiency heat exchange surfaces :energy efficiency combined with reducedsurface the specifier :- High energy efficiency, less floor spacerequired : the unit can be more easilyintegrated into an existing plant room,which allows for an increase of the avai-lable cooling Higher application flexibility.

5 Ice stora-ge, multiple operating conditions- Reduced sound and vibrations levelsallowing installation in sensitive the mechanical contractor :- Compact design, reduced shippingweight : easier handling during Condenser hydraulic connections pos-sible from both sides allowing easierintegration into the plant Fully factory tested reducing the com-missioning cost and the operating contractor :- State of the art motor protection : theunit control module permanentlysenses the current of each phase of themotor power supply as well as the tem-perature of the motor windings, thusensuring a complete and efficient pro-tection of the Adaptive Control, anticipates any ope-rating problems : the control moduleconsequently takes corective actions toenable the chiller to stay within opera-ting limits to guarantee trouble freeoperation even under critical condi-tions.

6 The unit control module is pro-grammed to react when faced with anemergency situtation such as refrige-rant loss, too low evaporator water flowrate, phase imbalance or even a stuckcontactor. The chiller can continue tooperate at a reduced load under thesecritical conditions until normal opera-tion can be restored whereas a stan-dard chiller would just stop as a Sophisticated operator interface : theclear language display board allows fora quick and precise identification of theoperating status of the machine or of anoperating fault as soon as it is detectedby the unit control Serial link allows for a remote monito-ring of the the owner.

7 - Superior energy efficiency reducingoperating Increase chiller life and drasticallyreduced maintenance costs : the com-pressors have been designed to opera-te for the whole life of the chillerwithout any major maintenance opera-tions. - Steady and safe operation : thanks tothe stepless capacity control, the elec-tronic expansion valve and the sophisti-cated control algorithms, the chillercan exactly match the required coolingcapacity and maintain the chiller wateroutlet temperature within a range of + C of the Serial communication link facility tostart and stop the chiller, modify thesetpoints or to limit the current drawnfrom a remote : Designed to offer more attractive benefits in all American Standard Inc.

8 20003 TRANE Helirotor screw compressors :Superior energy efficiency and expansion valve-Less critical components : only two rotatingparts, reduced number of components and par-ticularly of critical parts (the total number ofcritical components is on average 30 timeslower compared to a standard reciprocatingchiller)-Rugged design : all potentially fragile compo-nents (suction and discharge valves, springs)have been eliminated,the compressors are fit-ted with class 5 bearings designed not to bereplaced during compressor life time.

9 Thisperformance cannot be compared with recipro-cating compressors and even existing screwcompressors which are fitted with journal bea-rings which require periodical overhauling tocheck or replace the rotor 5/7 lobes profiles patentedby TRANE : only TRANE provide this specificcompressor design. This specific design gua-rantees a superior rotor rigidity. The latest evo-lutions allow in particular an extended capacitycontrol range precision machining : the very preciserotor tip tolerance (10 micrometers) is achie-ved due to the most advanced machine toolsavailable today.

10 TRANE is ableto build screw compressorswith a reduced amount ofleakage between thehigh and low pressurecavities. As a result, theenergy efficiency of thecompressor is conside-rably improved comparedto the first generation of screwcompressors which were in some cases derived from air compression technolgy- Rotary compressor :reduced sound andvibration level compared to reciprocatingequipments. The overall sound level is lowerand furthermore the shape ofthe soundspectrum isdifferent : the soundlevel is inferior in the low frequenciesbands.