Features of screw chillers

The screw chiller is a central air conditioning equipment host with a semi-enclosed twin-screw compressor as the core and refrigerant as the carrier. When cooling, it uses air or water as the cold source, and releases the heat on the load side to the cold source through the refrigeration cycle, thereby cooling and cooling the load side; when heating, the air-cooled unit uses air as the heat source, extracts the heat from the heat source side through the refrigeration cycle and releases it to the load side, thereby heating and heating the load side; the unit uses a high-quality imported brand twin-screw compressor, whose moving parts are only about 1/10 of the reciprocating compressor, and uses a total of 11 high-precision Swedish SKF bearings in the radial and axial directions. At the same time, it is combined with an axial thrust balance drum to effectively balance the axial load. The rotor is in continuous operation, and the vibration is only about 1/5 of that of the reciprocating type; there is no need to consider shock absorption when installing the whole machine; at the same time, it also ensures the long-term stable operation of the unit; the single compressor can choose a four-stage capacity adjustment method for energy saving, which can save energy as much as possible under partial load conditions while reducing the frequent start-up of the compressor, thereby extending the service life of the unit; combined with the highly intelligent control of PLC , so that the unit can achieve the best energy efficiency ratio regardless of full load or partial load, significantly reducing the user's operating costs; through the combination of multiple compressors, more detailed multi-stage capacity adjustment can be achieved;

The screw chiller can also adopt 25%-100% stepless capacity adjustment, but in order to ensure the long-term operation safety of the unit, it cannot be used in extremely harsh environments

and long-term operation at less than 50% of the nominal cooling capacity of the unit. Please confirm with our technical department before ordering;

The oil return method adopted by the screw unit is differential pressure return, without the need for an external oil pump, which greatly reduces the failure rate of the oil supply system; the compressor adopts an advanced three-stage

oil filter, which makes the oil filtration rate as high as 99.7%, which greatly guarantees the oil return of the compressor;

For units with multiple compressor heads, the microcomputer will automatically memorize the operating time of each compressor, and the compressor with less operating time will be activated first at the next startup; Similarly, when it is necessary to unload the operation, the unit with longer operating time will be unloaded first to achieve balanced operation of each compressor and extend the service life of the whole machine; In order to more fully separate the refrigeration oil from the refrigerant, the low-temperature chiller is equipped with an external centrifugal high-efficiency oil separator, which can greatly reduce the refrigeration oil retained in the evaporator due to low temperature, ensure the safety of the compressor lubrication system, and also improve the heat exchange effect of the evaporator; The screw air-cooled chiller accurately designs the aluminum sheet spacing to minimize the chance of frosting. Comprehensive analysis and judgment based on time, temperature and pressure are fully combined to truly realize on-demand defrosting, and each defrost is thorough, extending the defrosting interval. Screw chillers are widely used in various fields such as central air conditioning and industrial cooling. When used for industrial cooling, the low-temperature water produced by the chiller can be directly sent to the equipment and containers that need to be cooled. However, in order to control the precise and stable water temperature, the water outlet of the chiller is often sent to the buffer pool before entering the equipment or container that needs to be cooled. Screw chillers can be used for various low-temperature cooling in industrial cooling. After adding appropriate antifreeze to the chilled water side, the outlet water temperature can be 0 to -35°C to meet different industrial cooling requirements; the commonly used antifreeze solvents are ethylene glycol, sodium chloride and calcium chloride solutions. In application, it is recommended that customers set different concentrations of antifreeze solutions according to the outlet water temperature. Please refer to the attached table for the freezing points of various solutions; Screw chillers that fully follow the reverse Carnot cycle can obtain 3-4kW of cooling capacity or heating capacity under normal circumstances with an input of 1kW of electricity, and their operating costs will be more advantageous than other air conditioning methods.

Air-cooled chillers are easy to install and maintain, eliminating the need for cooling tower systems. Only chilled water pipes need to be connected. They do not occupy a dedicated machine room, have very few vulnerable parts, and have a low maintenance rate. Water-cooled chillers have high refrigeration efficiency, consume less electricity to produce the same cooling capacity, and have relatively less noise during operation. In order to better protect the atmosphere, in addition to HCFC22, refrigeration and air-conditioning equipment using green and environmentally friendly refrigerant media such as HFC407C and HFC134a can also be produced; the unit adopts advanced PLC control, which is highly intelligent, with built-in multi-stage timer switch control intelligent mode, which can realize automatic operation without guarding all day; the control system has a linkage control of the water pump reserved inside; and various protection functions are complete.

Product options

1.Salt water evaporator

2.Stepless energy regulation

3.Whole heat recovery/partial heat recovery

4.Pump control

5.Special power supply

Products features

※Twin screw compressor brand is employed,with high effciency Jow noise level,less wearing and long operation time.

※Four stage volume control or 0%-100%automatic regulation

※Use PLC microcomputer control from GermanySIEMENS.LCD touch screen,both English and Chinese human-machina intertace.

※Perfect breakdown protection:high and low pressure protection,air discharge protection,oil level protection,water flow protection,reverse and lack phase protection,chilled water anti-freezing protection,cooling water overheat protection.

Product specification

Refrigerant: R22/R134a/R407C

Evaporator max water pressure drop:1.0MPa

Evaporator:Fouling factor 0.018 m’℃/KW

Power supply: 380V/3P/50Hz

Allowable voltage fluctuate: ±5%

Allowable frequency fluctuate: ±2%

The unit uses high efficiency heat exchanger with advanced, unique shape design and systems. Units can be installed directly on the roof, or other well-ventilated place outdoors, without a separate room, space saving construction. Compact shape, appearance, unit uses“W”type coil design, space utilization, small unit size, in order to adapt to the outdoor weather conditions to ensure that the unit has a good operating results during the life cycle

Product Features

High efficiency and energy saving

1: Adopting high-efficiency screw compressors specially designed for evaporative cooling: adopting the most advanced screw tooth design, high-precision processing technology, and volumetric efficiency up to 95%; using internationally renowned brand high-efficiency fluorine-resistant motors, all working conditions are at the best efficiency.

2: End high energy consumption: further reduce the water and electricity consumption of the unit,saving operating costs

High-efficiency evaporative condenser

★The condensation heat of the refrigerant is directly discharged to the outdoor air and water, without the intermediate heat exchange link of the cooling water system. The condensation temperature of the unit can be reduced by about 4C compared with the traditional water-cooled unit, and the energy efficiency ratio can be improved by 12%. At the same time, the cooling water pump can be saved, which greatly reduces the input power consumption.

★The cooling water spray system adopts a large-flow anti-clogging basket-type nozzle to ensure continuous and uniform water distribution, so that water, air and refrigerant can fully exchange heat and ensure the excellent heat exchange performance of the condenser.

★The Fengshui co-directional mixed flow heat exchange technology is used, and the cooling technology of the PVC filler combination is used to achieve efficient heat exchange.

Self-contained cooling source: The compressor is fully linked with the condenser fan and water pump. When the load is partial, some or all condenser fans and water pumps are automatically shut down, effectively avoiding the defect that the cooling water pump and cooling tower still run at full load after the water cooling system compressor is unloaded and shut down, and the system operates efficiently. End the shirking of responsibility: After the refrigeration system fails, the main engine, cooling tower, water pump, installation and other suppliers shirk their responsibilities, which saves users' worries.

Excellent quality

High reliability compressor:

Screw compressor has few running parts, the internationally renowned brand high-efficiency fluorine-resistant motor has a built-in PTC electronic protection module, and the main bearing uses Swedish SKF rolling bearings with a life of up to 100,000 hours. So far, hundreds of thousands of compressors have been running all over the world.

The unit undergoes strict air tightness and vacuum tests before leaving the factory to ensure that there are no leaks in the whole machine and its components; the stringent performance, corrosion resistance and durability tests ensure that any unit is a high-reliability product.

The shell of the evaporative condenser is made of high-quality galvanized aluminum plate or stainless steel plate, which is one of the most corrosion-resistant plates today. Its service life is 3 to 6 times that of ordinary galvanized plates. It has the advantages of strong thermal resistance, high heat resistance, and beautiful appearance. After welding, the condenser is hot-dip galvanized as a whole to enhance its anti-corrosion ability;

Easy installation

1. End classified procurement: solve the repeated consultation and negotiation between users and suppliers of main engine, cooling tower, water pump installation, etc., saving valuable time;

2. End machine room investment: no dedicated machine room is required, saving land and machine room construction costs;

The unit adopts modular design, which is divided into parts for easy transportation and on-site hoisting. It can realize the networking operation of a single unit and 3 modules of any size.

Quiet operation

The semi-enclosed screw compressor adopts a double-layer shell structure and a standard base vibration-damping pad, which runs smoothly and reliably with low noise;

The condenser adopts an aluminum alloy axial flow fan specially used for evaporative cooling, with a forward-inclined wind blade structure design and a streamlined inlet air duct, which has low wind resistance, large air volume, low noise and high efficiency.

Intelligent control

Advanced Siemens PLC microcomputer controller;

Touch-type operation interface, users only need to turn on and off the machine and set the water temperature to complete the unit operation;

Remote central monitoring system (optional)

★ Can realize group control of up to 8 units and centralized control of chilled water pumps;

★ According to the trend of chilled water temperature change, adopt fuzzy control algorithm, intelligently detect air conditioning load, and optimize system operation efficiency:

★ Automatically record and save chilled water temperature, refrigerant pressure, current and operating parameters, and can be transmitted to Guoxiang in real time to provide expert technical services; high service quality and service efficiency:

★ Automatically send SMS to client equipment managers and manufacturers in case of failure.