The variable frequency water-cooled screw chiller is a more efficient industrial grade variable frequency unit. It not only inherits the high efficiency quality of the original fixed frequency, but also incorporates advanced variable frequency technology. It adopts internationally renowned brand variable frequency converters, greatly improving the energy efficiency of the unit at partial loads. It is a high-end screw unit with dual high efficiency of full load energy efficiency (COP) and comprehensive partial load performance coefficient (IPLV). The outlet temperature control accuracy is within plus or minus 0.5 degrees, and it is widely used in the field of precise temperature control of process cold water, improving product quality and high-precision water temperature requirements.

Overall framework structure description:

The overall framework and bottom plate of the unit are made of galvanized steel plates that have been treated with polyester spray coating on the outer surface to prevent rusting of the unit as a whole.

2. The layout of the unit structure is convenient, compact, and simple. The compressor, evaporator, and condenser are arranged in layers above and below, while other refrigeration components are arranged along the periphery of the frame, making it convenient for users to fully grasp the operating status of the unit. This provides effective protection for the evaporator and condenser during transportation, machine room installation, and daily operation, and makes maintenance more convenient. The layout inside the unit has undergone three-dimensional optimization design, with a compact layout and optimized external proportions. It requires less maintenance and repair space, occupies less room space, and significantly saves space.

Compressor description:

1. Specially designed for HFC134a, the semi enclosed twin-screw compressor has high compression efficiency and can operate efficiently at both full load and partial load.

2. Adopting high-precision machining of twin-screw rotors and aviation grade rotating bearings, it has the characteristics of stable performance, low noise, small vibration, and smooth operation.

3. The compressor is equipped with a three-stage high-efficiency oil separator, which ensures extremely high oil separation efficiency even at very high exhaust speeds. By improving the oil supply and lubrication method, the exhaust oil content and exhaust superheat are effectively reduced, thereby further improving the oil separation effect.

4. Cooperate with the microcomputer control system to automatically adjust the load output according to the working conditions, achieve stepless adjustment through the slide valve, and improve partial load performance.

Evaporator description:

1. Adopting a full liquid high-efficiency evaporator, the evaporator tube is completely immersed in boiling liquid refrigerant, effectively improving the refrigeration capacity and energy efficiency ratio of the unit.

2. The patented design of the ultra efficient enhanced heat transfer tube, with rolled threads on the outside of the tube, significantly improves the boiling and evaporation of refrigerant and facilitates bead condensation, significantly reducing the temperature difference between heat transfer inside and outside the tube.

3. Enhanced heat transfer on the inner side of the tube increases water side disturbance and turbulent heat transfer.

4. The chilled water flows inside the tube for easy cleaning and maintenance.

Condenser:

1. The shell and tube heat exchanger adopts efficient double threaded copper tubes, which improves the heat exchange effect between the shell side refrigerant and the tube side cooling water, and increases the heat exchange efficiency by about 30% compared to ordinary heat transfer copper tubes.

2. The condenser adopts a unique air intake method to evenly distribute the flow of refrigerant, extend the condensation distance, and achieve the best heat transfer effect. It also increases the subcooling of the unit, thereby effectively improving the cycle efficiency of the unit. 3. The design, manufacturing, and inspection of the condenser comply with national standards and regulations for pressure vessels such as GB/150 "Steel Pressure Vessels" and JB/4750 "Pressure Vessels for Refrigeration Equipment".

Control cabinet:

1. The unit start-up and microcomputer control parts are integrated into the same control cabinet, located at the front of the unit, making it easy for on-site operators to operate in the machine room and between units. All electrical repairs can be carried out at the front of the unit.

2. The electrical control box is made of high-quality steel plate, and its outer surface has been galvanized and powder coated to make it resistant to weather and effectively protect the electrical components of the unit.

For the safety of operators, once the host is powered on, operators will not be able to open the isolation board between the control and electrical components to ensure their safety.

Control system:

Adopting a new control system, it has a good human-machine interface, excellent control and adjustment functions, strong scalability, monitoring and management capabilities, and extremely strong compatibility. Multiple expansion accessories, adding remote and group control functions.

1. Friendly human-machine interface: The operation screen is embedded in the unit for convenient operation and good protection. Fully computer-controlled, achieving unmanned operation. The intuitive LCD interface displays data and parameter adjustments in multiple languages and menus. According to Clement's tradition, the press status and parameters have separate intuitive displays, making the operation situation clear at a glance.

2. Unit control and operation management: Siemens PLC computer intelligent control system, built-in with the company's specially designed control algorithm, highlights the energy-saving and reliability of the unit: FIFO compressor running time balance function, extends the life of the whole machine; Automatic load adjustment output function, energy-saving and power-saving; By cooperating with the load reduction system of the compressor, achieve 25-100% stepless adjustment; Adjust and set operating parameters to adapt to different environmental applications; Temperature and pressure protection adopts analog measurement, which can predict and prevent faults and increase reliability.

3. Network communication and building control functions: Supports building control connections. Common building control systems such as MODBUS, LONWorks, BACNET, etc. can be used.

4. FWS Internet Network Server: An optional network server can be used to monitor, set and adjust parameters, and control the operation of the unit through a local area network or Internet network.

5. Fault protection, alarm and analysis capabilities: The microcomputer intelligent controller has complete fault protection, alarm, recording and analysis functions, including high and low voltage switch, phase loss, reverse phase, overload, overcurrent, overheating, exhaust temperature, water flow, antifreeze and other protection functions. It also realizes fault recording and alarm display. The unique "Black Box" black box fault recording and analysis system can record 400 faults and more than 200 on-site data before each fault occurs, which can be used for fault diagnosis after the fault occurs, quickly eliminate faults, and improve technical support effectiveness. By connecting to the Clement Ser vice remote service program, potential faults can be detected and properly prevented before they occur, thus preventing potential problems before they occur. Electronic expansion valve:

The unit adopts electronic expansion valves, which have the following characteristics:
1. Accurately control the refrigerant flow rate and optimize the heat transfer performance of the evaporator.

2. According to the control and adjustment of the suction superheat of the unit, the performance is more stable and the efficiency of the unit deviation from working conditions and low load operation is improved.
3. React quickly, adjust quickly according to load changes, and ensure stable outlet water temperature of the unit.

High quality frequency converter:

1. By changing the frequency of the power supply, the frequency converter can adjust the speed of the compressor motor to achieve variable cooling capacity that matches the actual heat load. The speed can change rapidly, making it more efficient and energy-saving compared to fixed frequency units.

2. The unit is equipped with a frequency converter, which can achieve a frequency conversion starting form without current surge. The starting current of the unit will never exceed its nominal current value at full load, which can optimize the customer's power matching cost, reduce the size of the backup generator, and prevent the motor from overheating during startup.