Magnetic levitation variable frequency centrifugal chiller

The magnetic levitation variable frequency centrifugal chiller is a highly efficient and energy-saving product newly developed by Shenzhen Shenchuangyi Refrigeration Equipment Co., LTD. The entire series features dual first-class energy efficiency. The compressor adopts more advanced magnetic levitation technology, using 5-degree-of-freedom magnetic levitation bearings to optimize magnetic force design and minimize eddy currents. It is equipped with 15 reliable sensor technologies to ensure the stable operation of the entire machine's magnetic levitation bearing system. The multi-core control system with over 10,000 signal processors per second ensures the safe, efficient and stable operation of the unit during high-speed rotation.

The unit is mainly composed of a magnetic levitation centrifugal compressor, evaporator, condenser, economizer, adjustable throttle valve, on-board frequency converter and an automatic control system. The compressor adopts magnetic levitation bearings, which do not require lubricating oil and there is no need to worry about oil return restrictions. It has "0" friction, high efficiency, and is stable and reliable.

Unit composition

Magnetic levitation centrifugal compressor

◆ Two-stage compression, large surge margin, and wider operating range;

◆ The impellers are horizontally opposed, and the axial force is small;

◆ Variable frequency direct drive, low starting current and high unit efficiency;

◆ Magnetic levitation bearing, zero friction during operation, efficiency does not decline;

The built-in stepper motor and guide vane mechanism ensure precise mechanical limit and high reliability.

High-efficiency evaporator

Full liquid type (standard configuration

The liquid inlet of the evaporator adopts a liquid distribution distributor to effectively and evenly distribute the liquid refrigerant and improve the heat transfer efficiency. Meanwhile, the liquid-blocking net on the upper part of the heat exchange tubes not only prevents the evaporator from carrying liquid, but also evenly distributes the refrigerant and maintains pressure balance in the heat exchanger, avoids the occurrence of main pipes, and further improves the heat transfer efficiency of the heat exchanger.

◆ The heat exchange tubes are optionally equipped with dedicated high-efficiency full liquid evaporation tubes;

Add a gas deflector above the liquid deflector screen to prevent the evaporator from carrying liquid twice and improve the reliability of the flooded evaporator.

Falling film type (optional

Equipped with the design and manufacturing technology of falling film evaporators, falling film evaporators have the advantages of high heat transfer efficiency and low refrigerant charge.

Condenser

The intake adopts a baffle plus uniform exhaust structure, which effectively reduces the noise and vibration of the condenser. Evenly distributing the gas to the upper part of the heat exchange tubes can play the role of flushing the liquid film, making the heat transfer efficiency of the condenser higher.

The special subcooler design technology enables the subcooling degree of the unit to reach up to 5℃, effectively enhancing the energy efficiency of the unit.

Throttling mechanism

◆ High-quality electronic expansion valves at home and abroad are adopted to ensure the reliability and accuracy of the refrigeration system operation.

It has the advantages of energy saving, low applicable temperature, high accuracy and fast response speed, and can achieve precise refrigerant flow control according to the system requirements.

Airborne coolant-cooled frequency converter

The heat dissipation effect of refrigerant cooling is significantly better than that of air cooling/water cooling. It has higher cleanliness than air-cooled frequency converters and longer service life of electrical components. The problem of dirty blockage in water-cooled frequency converters is greatly reduced, significantly lowering the probability of unexpected downtime.

◆ Fully closed-loop temperature and humidity intelligent thermal management system, actively and precisely controlling the refrigerant, thereby achieving better cooling effect and energy efficiency ratio.

◆ Multi-objective PID control of flow and temperature difference is adopted to achieve high-load heat dissipation and anti-condensation functions, further enhancing the reliability and applicability of the product.

High efficiency and energy saving

The entire series features dual first-class energy efficiency

High-efficiency, multi-condition pneumatic design

The impeller adopts the optimization technology of CFD calculation + neural network + genetic algorithm to optimize the design of wide working condition parameters, achieving dual high efficiency at rated and partial loads.

Industrial-grade magnetic bearing technology

◆ Radial and axial integrated modular design, compact structure and stable performance;

No lubricating oil is required, with zero friction and low power consumption, only 3 to 10% of that of conventional oil bearings. Moreover, the higher the rotational speed, the more obvious the energy-saving effect.

Permanent magnet synchronous motor technology

The permanent magnet synchronous motor has a compact structure. The motor efficiency is 95% throughout the full operating range, and can reach up to 97.5% at the highest.

The space vector pulse width modulation technology is adopted to achieve energy conservation throughout the full-load operation range.

◆ H-class insulation design, real-time monitoring of stator temperature, achieving precise motor cooling with high reliability.

The two-stage compression + gas injection and enthalpy increase technology makes the unit more energy-efficient

◆ Full-flow field CFD simulation optimization, high pneumatic efficiency, innovative pipeline reflux design, uniform air supply, and low pressure loss.

The two-stage compression gas replenishment technology has increased the cycle efficiency by 5 to 6% compared with the single-stage refrigeration. At the same time, it adopts two-stage compression, with a large airflow Angle at the impeller outlet, a large surge margin, and a wider operating range.

Stable and reliable

Horizontally opposed compressor technology

◆ Double-stage impellers are horizontally opposed and designed with a double cantilever structure;

◆ The critical speed is higher, 30% higher than that of the single cantilever compressor;

The axial force is small, only 10% of that of a single cantilever compressor.

Active bearing control technology

◆ Five-degree-of-freedom bearing control, 10KHz position dynamic scanning;

◆μ m-level position control accuracy ensures precise suspension;

◆ Forward-looking vibration compensation to reduce the influence of unbalance on the vibration of the rotating shaft.

Wide-domain operation

Combined regulation + multi-condition design

The unit adopts variable frequency speed regulation combined with imported guide vanes (IGV) to adjust the cooling capacity. For conventional working conditions, it can achieve cooling capacity regulation from 10% to 10% without the need for hot gas bypass.

The compressor adopts a multi-condition design, mainly for air conditioning conditions, while also taking into account data center and water-ground source heat pump and heat recovery conditions.

Low noise and comfortable

◆ The operating noise is as low as 70dB(A);

◆ Oil-free and frictionless, reducing the transmission noise of mechanical components;

The structure of the horizontally opposed impeller of the compressor and the external pipeline reflux device reduces the aerodynamic noise of the refrigerant during the flow process.

Save costs

Compared with the traditional oil-lubricated centrifuge, the oil-free system significantly improves the reliability of the unit and there is no need to worry about the oil return problem of the unit.

There is no need for regular oil inspection. Maintenance is simpler and more convenient, and the maintenance cost is also lower.

Intelligent control

Product specifications and technical parameters

Unit model performance parameter table: Single Head System

note：

1.Operating conditions: GB/T 18430.1-2024;

2. The inlet and outlet water temperatures of the evaporator are 12℃/7℃, and those of the condenser are 30℃/35℃.

3. Specification parameters and external dimensions may change due to product improvements without further notice.

Unit model performance parameter table: Dual-head system

1.Operating conditions: GB/T 18430.1-2024;

2. The inlet and outlet water temperatures of the evaporator are 12℃/7℃, and those of the condenser are 30℃/35℃.

3. Specification parameters and external dimensions may change due to product improvements without further notice.

Unit model performance parameter table: Dual-head system