Profile
● Sanher variable frequency centrifugal chiller unit cooling capacity: 500 to 1400 ton.
● Brand: SANHER or OEM
● Evaporator Water Outlet temperature: 4~13℃
Condenser Water Outlet temperature: 29~38℃
● The power supply options:
Low-voltage unit: 3φ-380V-50Hz
High- voltage unit: 3φ-6KV-50Hz,3φ-6.6KV-50Hz,3φ-10KV-50Hz
● Start Mode: Variable frequency start
Features and Advantages
High efficient and energy saving
1.Centrifugal compressor.
Centrifugal compressor has two stages, with high strength alloy spindle, aluminum alloy material hermetic impeller and high precision gears internally. The bearing is not the plain one but the roller bearing, therefore it does not matter if the compressor emergency stops. Meanwhile, the startup interval can be shortened to 10 minutes, and the life of the bearing can be over 80000 hours.
2.High efficient condenser.
The condenser is divided into two parts-the up one and the low one by the air deflector which can divert the liquid refrigerant to the edge of the shell, so as to greatly improve the of heat exchange efficiency of the lower layer tube and reduce the condensation temperature by 0.5-1℃.This design is very efficient for large capacity unit.
| Compressor discharge |
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| Economizer |
3.Spray type (falling film) evaporator
(1)The liquid refrigerant, running into the evaporator, sprays on the heat exchange tube array from top to bottom. Because the liquid refrigerant forms a thin film on the tube wall and falls downward, the evaporator is also known as falling film one. As it is covered with a layer of liquid refrigerant film on the surface of the heat exchanger tube, the heat transfer efficiency is excellent.
(2)There is only little liquid refrigerant in the bottom of the evaporator so that the refrigerant charge is low, which can meet the requirements of environmental protection.
(3)The lubrication oil concentrates in the bottom of the evaporator after a large amount of refrigerant evaporation. The oil can be extracted by the oil reclaim pump successfully and turn back to the oil tank.
4.Economizer, oil cooler and oil reclaim heat exchanger
(1)Application of the combination of economizer, oil cooler and oil heat exchanger technology can improve the medium pressure saturated flashing gas and liquid refrigerant to separate effectively in the economizer. The medium pressure saturated flashing gas after separation will be injected into the compressor to complete the two-stage compression.
(2)The oil rich liquid refrigerant from the evaporator is heated into the refrigerant vapor and oil, and then turns back to the oil tank.
(3)The high temperature oil from the compressor enters into the economizer first to be cooled to proper temperature, and then injected into the compressor parts that need to lubricate.
Advanced Control
1.Microcomputer controller
Our centrifugal chillers are equipped with advanced microcomputer controller and adopt the core components of double CPU, with 0.25ms operation speed while executing 1K words program, to ensure the unit stable operation
2.Man-machine interface
The touch screen with storage space has high reaction speed. So users can grasp the integrated running states in time. Intuitive operation picture with the language selection of English and Chinese, all you have to do is to click on the menu so that operate and set the unit.
3.PID control function
Microcomputer controller adopts advanced PID control function, adjusting the unit load automatically according to the integer of the cold water outlet temperature and target temperature to meet the requirements in the shortest time; and making the water outlet temperature stable within +-0.2℃ of the target temperature.
4.Unit protection function
Provide protection of over voltage, under voltage, three phase unbalance and anti-phase lack for user's unit power. Besides, there are more than 30 kinds of protecting functions.
5.Multiple anti-surge functions
Unit has advanced multi anti-surge function, with the combination methods of prevention, control and alarm, to enable the unit to meet the customer's demand of refrigerating capacity in the safe operating range.
(1)Prevention: The unit will adjust state automatically when the running condition approximately approaches the surge line through accurate calculation of surge curve.
(2)Control: The unit will adjust running status timely when surge occurs, making control of surge effectively.
(3)Alarm: If unit surge lasts for a period of time, it will alert to remind customers and execute the stop operation.
6.Reserve connection points for users
(1)Reserve the control points of the fan of cooling tower, cooling water pump and chilling water pump for users, and make the fan and water pump controlled by the unit, optimizing the organization of the customer's system.
(2)Unit reserves alarm output points for remote alarm display.
(3)Also reserves central monitoring connection points (RS-485 interface), to enable the unit to be connected seamlessly to the building monitoring system.
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