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For halocarbon refrigerants and medium /low temperature applications |
General : |
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Construction Reliability for Process Industries … Process industries work 24 x 7 all 365 days unlike comfort applications wherein human comfort is the only question a chiller has to satisfy. The Process chiller has work to keep the process parameters under control save which there are all chances the process may not be able to achieve its final formation as required. Starcore Refrigeration Ltd. has designed a chiller keeping these necessities in mind |
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Range : |
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Standard Component Supply
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Shell and Tube Evaporators : The evaporator is a tube-in-shell heat exchanger design with internally and externally finned copper tubes roller expanded into the tube sheet. The evaporator is designed, tested and stamped in accordance with ASME for a refrigerant side working pressure of 200 psig. The evaporator is designed for a waterside working pressure of 150 psig. Each shell includes a vent, a drain and fittings for temperature control sensors and is insulated with 3/4-inch to 4 inches depending on the required K factor. Optimized for R134a, R22, R404 A high-efficiency duties.
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Condenser and Fans : Air-cooled condenser coils have aluminum fins mechanically bonded to internally finned seamless copper tubing. The condenser coil has an integral sub cooling circuit. Condensers are factory proof and leak tested at 506 psig. Direct-drive vertical discharge condenser fans are dynamically balanced. Three phase Condenser fan motors with permanently lubricated ball bearings and internal thermal overload protection are provided. Standard units will start and operate between 4 to 45Degc ambient. |
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Compressor and Oil Flow System : The rotary screw compressor is semi hermetic, direct drive, 3600 rpm, 60 Hz, [3000 rpm, 50 Hz], with capacity control slide valve, a load/unload valve, rolling element bearings, differential refrigerant pressure oil pump and oil heater. The motor is a suction gas cooled, hermetically sealed, two-pole squirrel cage induction motor. Oil separator and filtration devices are integral with the compressor for medium temperatures and provided separate for low temperature applications. Check valves in the Compressor discharge and lube oil system and solenoid valves in the lube system are also provided. |
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Refrigeration Circuits : Each unit depending on its capacity can have one or two refrigerant circuits, with one or two rotary screw compressors per circuit. Each refrigerant circuit includes a compressor suction and discharge service valve, liquid line shutoff valve, removable core filter, liquid line sight glass with moisture indicator, charging port and an electronic expansion valve. Fully modulating compressors and electronic expansion valves provide variable capacity modulation over the entire operating range. |
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Control Engineering : All unit controls are housed in an outdoor rated weather tight enclosure. All controls, including sensors, are factory mounted and tested prior to shipment. Microcomputer controls provide all control functions including start-up and shut down, leaving antifrogen temperature control, compressor and electronic expansion valve modulation, fan sequencing, anti-recycle logic, automatic lead/lag compressor starting and load limiting. The unit control automatically takes action to avoid unit shutdown due to abnormal operating conditions associated with low refrigerant pressure, high condensing pressure and motor current overload. Should the abnormal operating condition continue until a protective limit is violated, the unit would be shut down? Unit protective functions include loss of chilled water flow, evaporator freezing, low refrigerant pressure, high refrigerant pressure, reverse rotation, compressor starting and running over current, phase loss, phase imbalance, phase reversal, and loss of oil flow. A digital display indicates chilled water setpoint and leaving chilled water temperature as standard. Standard power connections include main three phases power to the compressors, condenser fans and control power is all single phase at 230 Volts. |
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Unit Controls :
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Chiller Inputs :
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Chiller Outputs :
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