Model CYK Compound Centrifugal Liquid Chillers Design Level G 700 Through 2400

Model CYK Compound Centrifugal Liquid Chillers Design Level G 700 Through 2400 TONS (2500 Through 8440 kW) Utilizing HFC-134a FORM 160.82-EG1 (408)  JOHNSON CONTROLS Table of Contents FORM 160.82-EG1 (408)...........................................................................................................................................1 Introduction. ..............................................................................................................................................................3 Mechanical Specifications. ......................................................................................................................................5 Accessories and Modifications. ............................................................................................................................ 11 Application Data.....................................................................................................................................................12 Overall Chiller Arrangement. .................................................................................................................................21 Compact Nozzle Arrangements............................................................................................................................22 Marine Nozzle Arrangements................................................................................................................................28 Guide Specifications. .............................................................................................................................................32 SI Metric Conversion. .............................................................................................................................................38 NOMENCLATURE FORM 160.82-EG1 (408) JOHNSON CONTROLS  The YORK Compound YK Chiller is a design using two centrifugal compressors arranged in series to handle ra­ diator-cooled, brine-chilling, and heat-pump applications at conditions outside the range of typical centrifugal chill­ ers. These custom units use HFC-134a refrigerant and are available in a wide range of capacities: • For air-cooled applications, (air-cooled radiators) 700 to 2,400 tons at 45°F LWT and up to 155°F LCWT (2,500 to 8,440 kWR at 7°C LWT and up to 68.3°C LCWT). • For brine chilling, 400 to 2,000 tons at 20°F LBT and 95°F LCWT (1,410 to 7,030 kWR at -7°C LBT and 35°C LCWT). Brine temperatures as low as 0°F (-17.8°C) can be achieved. • For heat pump applications, 11,000 to 40,000 MBH (3,200 to 11,700 kWR) heat rejection. STANDARD COMPONENTS Each compound chiller employs common parts instead of a one-of-a-kind design. The compressors and heat exchangers use standard technology proven in the suc­ cessful YORK packaged chiller line. Each compressor is driven by a standard, open-drive electric motor. COMPACT FOOTPRINT Compressors and motors are mounted above the shells to assure the smallest footprint for this type of chiller. GREATER ADAPTABILITY With the compound chiller, the impeller diameter, width and speed can be optimized for each stage of compres­ sion based on operating conditions. SUPERIOR PART-LOAD PERFORMANCE Using a compound arrangement allows the use of pre-rota­ tion-vane (PRV) capacity control for the centrifugal impellers of both compressors. Pre-rotation vanes act like a throttle on the suction side of the compressor to control compres­ sor load. With PRV control on both compressors, the result is better part-load performance than for typical multistage compressors. HANDLES VARYING CONDENSING CONDITIONS Since chillers most often operate at off-design conditions, off-design performance is a major factor in the energy saving equation. A compound chiller can operate with a wider range of condensing water temperatures than typical chillers. The compound unit allows one compressor to be shut off, so the chiller can run on just one compressor during low head conditions. This practice not only ensures system stability, it allows the chiller to run more efficiently and takes advantage of cooling water temperatures well below design. Lower inrush current Instead of starting a single, large motor, the compound chiller stagger-starts the motors in sequence. Conse­ quently, peak inrush current is reduced to about 58% com­ pared to starting a motor for a single large compressor. Lower sound levels Acoustically, with compound compressors sharing the workload, compressor RPMs are lower than in standard centrifugal designs — and lower RPMs help lower sound levels. Graphic control A powerful, graphic control panel makes chiller operation easy. Startup is handled by a push of the button; there is no need for manual intervention in the staggered-start sequence of the compressors. A color graphical operator interface means operating parameters, set-points and alarms are clearly visible, ensuring proper reading and response. FLASH Economizer (INTERCOOLER) The Compound YK Chiller includes a flash economizer (intercooler) that results in better efficiency during two stage operation. The Compound YK can be purchased without the economizer but the efficiency will be lower. OPEN DRIVE DESIGN Hermetic-motor burnout can cause catastrophic damage to a chiller. The entire chiller must be cleaned, and the refrigerant replaced. YORK centrifugal chillers eliminate this risk by using air-cooled motors. Refrigerant never comes in contact with the motor, preventing contamination of the rest of the chiller. Insurance companies that offer policies on large air conditioning equipment often consider air-cooled motors a significant advantage over hermetic refrigerant-cooled units. HIGH-EFFICIENCY HEAT EXCHANGERS The chiller heat exchangers offer the latest technology in heat transfer surface design to give you maximum efficiency and compact design. Waterside and refriger­ ant-side design enhancements minimize both energy consumption and tube fouling. SINGLE-STAGE COMPRESSOR DESIGN AND EFFICIENCY PROVEN IN THE MOST DEMANDING APPLICATIONS Designed to be the most reliable chillers we’ve ever made, YORK centrifugal chillers incorporate single- stage compressor design. With fewer moving parts and straightforward, efficient engineering, YORK single-stage Introduction  JOHNSON CONTROLS compressors have proven durability records in hospitals, chemical plants, gas processing plants, the U.S. Navy, and in other applications where minimal downtime is a crucial concern. In thousands of installations worldwide, YORK single stage compressors are working to reduce energy costs. High strength aluminum-alloy compressor impellers feature backward-curved vanes for high efficiency. Airfoil shaped pre-rotation vanes minimize flow disruption for the most efficient part load performance. Precisely positioned and tightly fitted, they allow the compressor to unload smoothly from 100% to minimum load for excellent opera­ tion in all applications. PRECISION CONTROL OF COMPRESSOR OIL PRESSURE Using our expertise in variable speed drive technology and applications, Johnson Controls has moved beyond the fixed head and bypass approach of oil pressure control. The old approach only assures oil pressure at the outlet of the pump rather than at the compressor, and allows no adjustment during chiller operation. The Compound chillers feature two variable speed drive oil pumps, monitoring and providing the right amount of oil flow to each compressor on a continuous basis. This design also provides sophisticated electronic monitoring and protection of the oil pump electrical supply, ensuring long life and reliable operation of the oil pump mo­ tor. Variable speed drive technology reduces oil pump power consumption, running only at the speed required, rather than at full head with a pressure regulating bypass valve. FACTORY PACKAGING REDUCES FIELD LABOR COSTS YORK centrifugal chillers are designed to keep installa­ tion costs low. Where installation access is not a problem, the unit can be shipped completely or partially packaged, requiring minimal piping and wiring to complete the instal­ lation. The flash economizer (intercooler) ships separately for assembly to the chiller at time of installation. All piping between the economizer and the chiller is prefabricated so no welding is required for installation. TAKE ADVANTAGE OF COLDER COOLING TOWER WATER TEMPERATURES YORK centrifugal chillers have been designed to take full advantage of colder cooling tower water temperatures, which are naturally available during most operating hours. Considerable energy savings are available by letting tower water temperature drop, rather than artificially holding it above 75°F (23.9°C), Especially at low load, as some chillers require. Heat Pump The Compound YK is ideal for use in heat pump applica­ tions supplying up to 155°F (68.3°C) leaving condenser water temperature. In this application the CYK can provide Coefficients of performance over 4 times greater than wa­ ter heaters. More information on heat pump applications can be found in Johnson Controls Form 160.00-PM31. COMPUTERIZED PERFORMANCE RATINGS Each chiller is custom-matched to meet the individual building load and energy requirements. Standard heat exchanger tube bundle sizes and pass arrangements, are available to provide the best possible match. It is not practical to provide tabulated performance for each com­ bination, as the energy requirements at both full and part load vary significantly with each heat exchanger and pass arrangement. Computerized ratings are available through each Johnson Controls sales office. These ratings can be tailored to specific job requirements. Introduction - continued FORM 160.82-EG1 (408) JOHNSON CONTROLS 5 Mechanical Specifications GENERAL The YORK CYK Compound Centrifugal Liquid Chillers are factory-packaged including the evaporator, condenser, compressor, motor, lubrication system, control center, and interconnecting unit piping and wiring. The flash econo­ mizer (intercooler) ships loose for assembly to the chiller at time of installation. All piping between the economizer and the chillers is prefabricated in the factory so no weld­ ing is required in the field. The initial charge of refrigerant and oil is supplied for each chiller. Actual shipping procedures will depend on a number of project-specific details. The services of a Johnson Controls factory-trained, field service representative are incurred to supervise or perform the final leak testing, charging, the initial start-up, and concurrent operator instructions. COMPRESSOR Each compressor is a single-stage centrifugal type powered by an open-drive electric motor. The casing is fully acces­ sible with vertical circular joints and fabricated of close-grain cast iron. The complete operating assembly is removable from the compressor and scroll housing. The rotor assembly consists of a heat-treated alloy steel drive shaft and impeller shaft with a high strength, cast aluminum alloy, fully shrouded impeller. The impeller is designed for balanced thrust and is dynamically bal­ anced and overspeed tested for smooth, vibration free operation. The insert-type journal and thrust bearings are fabricated of aluminum alloy and are precision bored and axially grooved. The specially engineered, single helical gears with crowned teeth are designed so that more than one tooth is in contact at all times to provide even distribution of compressor load and quiet operation. Gears are integrally assembled in the compressor rotor support and are film uploads/Management/ guide-specs.pdf

Documents similaires

THEME : PROPOSITIONS POUR UNE RELANCE DYNAMIQUE DE LA STRATEGIE DE COMMUNICATIO 0 0

Développement d’une stratégie d’innovation pour le développement des systèmes d 0 0

TECHNIQUES D’EXPRESSION ET DE COMMUNICATION: La lettre de motivation Départemen 0 0

Génie des Systèmes Urbains Génie des Systèmes Urbains AUTOMNE 2015 AUTOMNE 2015 0 0

Titre : Le stage pratique Chapitre I : Le stage pratique I-1 Définition d’un st 0 0

Professeur Camélia KERKOUR. FSTH. GPE. S2. M12 Cours « Méthodologie du rapport 0 0

LE RAPPORT DE STAGE ET LA SOUTENANCE Quand faut-il commencer le rapport de stag 0 0

Mathéo ZILIO 229 rue des Semailles, résidence Columba Appartement B08, Agen 470 0 0

Essedraoui Marwa NR 621 02 EME ETAGE SE 01 LOT RYAD OULED MTAA TEMARA 07 00 31 0 0

1 MINISTERE DE L’ENSEIGNEMENT SUPERIEUR ET DE LA RECHERCHE SCIENTIFIQUE DIRECTI 0 0

• Détails
• Publié le Nov 07, 2021
• Catégorie Management
• Langue French
• Taille du fichier 1.5389MB