a. The refrigeration system circuit is designed with multiple heads to choose from, and the systems do not interfere with each other.

b. 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.

c. Application of Refrigeration Compressors

Brand 5:6 asymmetric twin-screw compressor, which is a screw compressor with moving parts that are 1/10 of reciprocating compressors and vibration that 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 heat pump 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. Highly reliable functional components

◇ Heat exchanger: The evaporator of the unit adopts a shell and tube heat exchanger, using imported sheet metal, and the internal heat exchange copper tube adopts an internally threaded copper tube type. It has high pressure resistance, high heat exchange efficiency, maintenance free, and long service life. The unit condenser adopts hydrophilic film spraying, which has high heat transfer efficiency, prevents ventilation blockage, and improves the corrosion resistance of the fins.

◇ 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.

e. Application of refrigerants

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

f. Unit enclosure

The unit adopts an integrated design, resulting in a compact and simple design. The enclosure structural components are all electrostatically phosphated and sprayed with automatic spraying equipment, which has strong corrosion resistance. It is equipped with a waterproof cabinet to ensure that the unit can be placed outdoors for a long time without fading or corrosion.

Note:

The parameters under nominal operating conditions are as follows: inlet/outlet temperature of chilled water -1 ℃/-5 ℃; The ambient temperature is 35 ℃.

2. Temperature conditions: The outlet temperature range of chilled water is -7 ℃~-3 ℃, and the inlet temperature range of cooling water is 0 ℃~43 ℃.

3. The water side of the evaporator and condenser is designed to withstand a pressure of 1.0MPa

The fouling coefficient on the water side of the evaporator under nominal operating conditions is 0.018 ㎡·℃/KW.

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