The CLINT CWW 702-V÷5602-V is a series of water-cooled liquid chillers and heat pumps with screw compressors, designed for industrial and commercial applications. This comprehensive range offers units with cooling capacities from 185 to 1630 kW, making them suitable for a wide array of cooling and heating demands.
Function Description:
The CWW 702-V÷5602-V series units are designed to produce chilled water for air conditioning systems or process cooling, and in heat pump versions, they can also provide hot water for heating. The core of the system is a refrigeration circuit that utilizes screw compressors. These compressors are known for their high efficiency and reliability, especially in variable load conditions. The units incorporate an evaporator for heat exchange with the water circuit and a condenser for rejecting or absorbing heat from an external source (typically a cooling tower or a dry cooler for chillers, or an external heat source for heat pumps).
The control system is managed by a microprocessor, which allows for precise regulation of operating parameters and set-points. This microprocessor-based control ensures optimal performance, energy efficiency, and reliable operation. It can manage up to four compressors, offering flexibility and redundancy. Key functions include monitoring water inlet and outlet temperatures, identifying and displaying system blocks via alphanumeric codes, controlling one or two pumps, and managing compressor and pump sequencing for even wear and extended lifespan. The system also features frost protection, remote on/off capabilities, manual operation, and various alarm signals for high/low pressure, oil, overload, antifreeze, and flow switch errors.
Important Technical Specifications:
The CWW 702-V÷5602-V series offers a wide range of models with varying capacities. For instance, the 702-V model has a cooling capacity of 185 kW and an absorbed power of 47 kW, while the largest 5602-V model boasts a cooling capacity of 1630 kW with an absorbed power of 373 kW.
Cooling Capacity (kW):
- 702-V: 185 kW
- 802-V: 226 kW
- 902-V: 246 kW
- 1102-V: 291 kW
- 1202-V: 319 kW
- 1502-V: 370 kW
- 1602-V: 427 kW
- 1802-V: 470 kW
- 2002-V: 526 kW
- 2202-V: 605 kW
- 2402-V: 633 kW
- 3202-V: 754 kW
- 3302-V: 843 kW
- 3402-V: 897 kW
- 3602-V: 931 kW
- 4002-V: 1026 kW
- 4202-V: 1086 kW
- 4602-V: 1332 kW
- 5002-V: 1508 kW
- 5602-V: 1630 kW
Operating Conditions (Reference):
- Cooling:
- Entering water temperature: 12°C
- Leaving water temperature: 7°C
- Condenser entering water temperature: 30°C
- Condenser leaving water temperature: 35°C
- Heating (for heat pump versions):
- Entering water temperature: 40°C
- Leaving water temperature: 45°C
- Evaporator entering water temperature: 10°C
Operating Limits:
- Evaporator inlet water temperature: 8°C to 20°C
- Evaporator outlet water temperature: 5°C to 15°C
- Evaporator water thermal difference: 3°C to 9°C
- Condenser inlet water temperature: 10°C to 45°C (42°C for 5002-V/5602-V models)
- Condenser outlet water temperature: 25°C to 50°C (47°C for 5002-V/5602-V models)
- Condenser water thermal difference: 4°C to 12°C
- Minimum chilled water/glycol temperature: -8°C
- Max. operating pressure (evaporator water side): 1000 kPa
- Max. operating pressure (condenser water side): 1000 kPa
Construction Features:
The units are built with a galvanized steel frame, protected by polyester powder painting, ensuring durability and resistance to environmental factors. The frame is designed for easy access to internal components for maintenance and repair. The refrigeration circuit includes semi-hermetic screw compressors, an oil separator, crankcase heater, sight glass, thermal protection, and antifreeze protection. The shell and tube type evaporator and condenser are designed for easy maintenance. Each refrigerant circuit is equipped with an independent condenser.
Noise Levels:
Sound pressure levels are measured in free field conditions at 1m distance and 1.5m height from the ground. For example, the 702-V model has a total sound pressure level of 73.6 dB(A) (STD version), while the 5602-V model has 82.3 dB(A) (STD version). SSL (Super Silent Low Noise) versions are available, offering reduced noise levels. For instance, the 702-V SSL has 67.8 dB(A), and the 5602-V SSL has 76.2 dB(A). A tolerance of +/- 3 dB(A) should be considered based on installation type (DIN 45635).
Usage Features:
- Microprocessor Control: The advanced microprocessor allows for precise control of set-points and operating parameters, offering flexibility and efficiency.
- Remote Display (optional): An optional remote display allows for monitoring and control from a distance.
- Serial Interface (RS 485): For connection to centralized control and supervision systems.
- Pressostatic Valve (PV3) (optional): A 3-way pressostatic valve for condensation control.
- Antivibration Dampers (AG/AM) (optional): Rubber or spring shock absorbers can be installed at the base to reduce vibrations.
- Flow Switch (FL): Protects the evaporator from water flow interruptions.
- Soft Start Compressors (optional): Reduces starting current and mechanical stress on compressors.
- Pump Control: The system can control one or two pumps, including a flow switch alarm delay at start-up.
- Compressor and Pump Rotation: Ensures even wear across multiple compressors and pumps, extending their operational life.
- Individual Compressor Start-up: Compressors start individually, not simultaneously, to minimize power surges.
Maintenance Features:
- Easy Access: The unit's design provides easy access to internal components for maintenance and repair.
- Filter-Drier: The refrigeration circuit includes a filter-drier (FD) to maintain refrigerant purity.
- Water Drain (SCA): Allows for easy draining of water from the system.
- Manual Air Vent Valve (SFA): Facilitates the removal of air from the water circuit.
- Temperature Sensors (ST1, ST2): Sensors for unit operation and antifreeze protection allow for continuous monitoring and diagnostics.
- Pressure Transducers (TP, TPL): Monitor high and low pressures within the refrigeration circuit.
- Alarm System: Comprehensive alarm signals (high/low pressure, oil, overload, antifreeze, flow switch, configuration error) aid in quick troubleshooting.
- Hour Counter: Tracks the operating hours of compressors, assisting in scheduling preventive maintenance.
- Fouling Factors: Correction factors are provided for both evaporator and condenser to account for fouling, which can impact performance over time. These factors are crucial for accurate performance calculations and maintenance planning.
- Hydraulic Circuit Maintenance: Regular venting of the system is recommended to prevent air bubbles, which can cause evaporator freezing. Draining the system during winter (or when not in use) is also advised. All components of the hydraulic circuit, including valves, filters, and sensors, are designed for accessibility and maintenance.
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