Screw type water-cooled chiller unit single machine

a. The compressors of each refrigeration system are started in sequence, and a single compressor is started with star delta voltage reduction under low load (25%) to reduce the starting current and thus reduce the impact on the power grid.

b. Application of Refrigeration Compressors

◇ Brand 5:6 asymmetric twin-screw compressor, which is the current screw compressor. Its moving parts are 1/10 of reciprocating compressors, and the vibration is 1/5 of reciprocating compressors, without the need for foundation fixation. A total of 11 high-precision German FAG and Swedish SKF bearings are used in both radial and axial directions, combined with axial thrust balance drums to balance axial loads. The failure rate is 1/10 of that of reciprocating compressors, and with the addition of components, the unit can operate stably for a long period of time, with high energy efficiency, long service life (100000 hours of operation), low failure rate, and easy maintenance.

A single compressor can achieve graded and stepless energy regulation, which is flexible, convenient, and energy-efficient in operation.

The double-layer three-dimensional oil separation filter has good oil filtration effect, ensuring the normal operation of the compressor and the cleanliness of the heat exchanger, so that the unit is always in heat exchange.

Adopting a pump free built-in pressure differential lubrication system, energy-saving and reliable.

◇ Fluorine resistant and low loss motor design, equipped with reliable motor overheating protection device to ensure reliable operation of the motor.

Equipped with a liquid refrigerant injection system under low temperature conditions, it reduces the workload and operating temperature of key parts, and improves the reliability of the compressor.

The design of the exhaust chamber and continuous gas supply to the rotor ensure low vibration and low noise of the compressor.

d. The application of economic technology

The outlet temperature of the unit is below -10 ℃, using economizer technology. By fully utilizing the characteristic of the screw compressor with an economizer interface, a portion of the condenser liquid is throttled and depressurized through an expansion valve to enter the economizer for cooling the other majority of the refrigerant in the condenser. This increases the subcooling temperature and improves the cooling capacity of the unit. At the same time, the single-stage compression of the screw compressor is transformed into quasi second stage compression, which improves the gas transmission coefficient of the compressor and thus enhances its efficiency and reliability.

e. Highly reliable functional components

◇ Heat exchanger: The evaporator and condenser of the unit are both shell and tube heat exchangers, using imported plates, and the internal heat exchange copper tubes are made of internally threaded copper tubes. It has high pressure resistance, high heat exchange efficiency, maintenance free, and long service life.

◇ System: The unit adopts Siemens system. Adopting PLC technology, it can accept programming and has complete communication functions, making it easy to interface with building intelligent systems.

Electrical system: The unit uses electrical components from brands such as Siemens and Schneider.

◇ Human machine interface: The unit adopts Siemens touch LCD display screen, with Chinese and English human-machine interface, simple operation program, one click start, and automatic operation.

Other operating components such as expansion valves, solenoid valves, drying filters, electrical components, etc. are all imported brands with reliable quality and long service life.

f. Application of refrigerants

Multiple refrigerants can be used, such as R134a, R407C, R404A, etc., to meet social requirements.