air-cooled chillers for die-casting machines

air-cooled chillers for die-casting machines

Air-cooled screw chillers for die-casting machines are special refrigeration equipment used in die-casting production processes. They are used to cool the hydraulic oil and molds of die-casting machines to ensure the stable operation of the die-casting process and the quality of die-cast products. The following is a detailed introduction:

Working Principle

The working principle of air-cooled screw chillers for die-casting machines is based on the vapor compression refrigeration cycle. The screw compressor sucks in the low-temperature and low-pressure gaseous refrigerant from the evaporator, compresses it into a high-temperature and high-pressure gaseous refrigerant, then sends it to the air-cooled condenser. In the condenser, the high-temperature and high-pressure gaseous refrigerant exchanges heat with the air, condenses into a high-pressure liquid refrigerant, and then passes through the throttle device to become a low-temperature and low-pressure liquid refrigerant. Finally, it enters the evaporator, absorbs the heat of the cooling medium (such as water or ethylene glycol solution) in the evaporator, evaporates into a low-temperature and low-pressure gaseous refrigerant, and returns to the compressor to start the next refrigeration cycle.

Product introduction for screw water chillers
Industrial screw water chillers equipped with screw compressors are called screw chillers. screw chillers have two kind: water-cooled screw chillers and air-cooled screw chillers. 

The difference of water-cooled screw chillers and air-cooled screw chillers:
Industrial water cooled and cooling screw chiller don't have fans on top, must work with cooling towers which can cool the condenser of the chiller.



Industrial air cooling screw compressor chillers are equipped with  fans on top, have threee kind compressors brand (Hanbell, Bitzer, Refcomp) for you to choose.



Specifications for Industrial air cooled and cooling screw chiller:

Inside pictures of Industrial air cooled and cooling screw chiller

01 Semi-hermetic Compressors

▪ Adopted world famous branded semi-hermetic compressors for long term reliable and efficient running; ▪ Compressor runs with no stage limits to realize stageless continuous adjustment of cooling capacity in between 25%-100% power loaded and maintaining stable outputs; ▪ Option: HANBELL, BITZER

      bitzer compressor                                                                                                Hanbellcompressor

02 AIr cooled high-efficient inner threaded copper-tubing hydrophilic aluminum foil fin type Evaporator

The condenser type is hydrophilic aluminum foil fin type. The aluminum foil is hydrophilic treated. Through special processing, a hydrophilic layer is coated on the surface. The condensed water will spread quickly on the hydrophilic aluminum foil and will not condense into water droplets. Increase the heat exchange area, speed up the cooling and heating speed, and effectively avoid the noise caused by condensed water blocking the air flow.

The raw material of the heat exchanger is hydrophilic aluminum foil, which can increase the refrigeration efficiency by 5%. It is also anti-corrosion and anti-mold, has no odor, and will not cause the accumulation of water droplets to block the heat exchange.

03 Shell and Tube Evaporator

shell and tube type evaporator adopts inner treaded copper design, with larger heat exchanging area for higher efficiency and maximizing system performance.



05 Dry filter
Adopt welded angle filter, the filter element is imported molecular sieve. Can filter water, acid and other impurities, and easy to replace. 

 
06 Thermal expansion valve

The imported thermal expansion valve is used to throttle and cool the high-pressure super cooled liquid into a low-temperature and low-pressure liquid, and automatically adjust the flow rate of the refrigerant into the evaporator according to the evaporation temperature, and maintain a certain pressure to ensure evaporation in the evaporator. rate.

07 Electrical control system

The control panel is an LCD touch screen, highly automated, easy to operate, intuitive interface, which can make the unit to continuously adjust the performance energy between 25% and 100% (or stepless energy adjustment) to ensure the complete performance of the compressor Play and help users save operating costs to the greatest extent. The control panel interface has two languages, Chinese and English.

08 Safety protection device：

The system is equipped with motor overload, short circuit protection, overheating, high pressure, low pressure, compressor delay start protection, water flow protection and other functions, the unit runs safely and reliably.

Structural Composition

• Screw Compressor: It is the core component of the chiller, usually using a semi-closed twin-screw compressor, with the advantages of high efficiency, reliability, low vibration and low noise.
• Air-cooled Condenser: It is generally a fin-tube structure, which is composed of copper tubes and aluminum fins. The external rotor fan is used to make the air flow through the fins to take away the heat of the refrigerant, so as to achieve the purpose of cooling the refrigerant.
• Evaporator: The commonly used shell-and-tube evaporator has high heat transfer efficiency. The refrigerant flows inside the tube, and the cooling medium flows outside the shell. Through heat exchange, the cooling medium is cooled.
• Throttle Device: It includes thermal expansion valve and electronic expansion valve. The thermal expansion valve automatically adjusts according to the temperature of the refrigerant at the outlet of the evaporator, while the electronic expansion valve can be precisely controlled by a computer, with higher adjustment accuracy and is suitable for variable load scenarios.
• Control System: Equipped with a PLC or microcomputer controller, it supports touch screen operation, can monitor the operating status of the chiller in real-time, and has multiple safety protection functions such as high and low pressure protection, overload protection, phase loss protection, and anti-freeze protection.

Characteristics and Advantages

• High Cooling Capacity: It can meet the large cooling demand of die-casting machines, especially for large-scale die-casting islands of 2000T and above, and can provide stable cooling capacity.
• Flexible Installation: It only depends on air for heat dissipation, without the need for water sources, cooling towers, cooling water pumps and water pipelines, saving installation space and water resources, and is suitable for water-scarce areas, outdoor scenes or temporary projects.
• Energy Saving and Consumption Reduction: The screw compressor can realize stepless adjustment of 25-100%, and can automatically adjust the operating state according to the load change to avoid energy waste. In addition, the frequency conversion fan motor can also adjust the wind speed according to the ambient temperature, further reducing energy consumption.
• Intelligent Control: With PID+PLC control system and a 10-inch touch screen, it has a friendly human-machine interface and supports full protocols such as Modbus-RTU, Profinet, EtherCAT, and OPC-UA, which can be seamlessly docked with the host machines of major brands such as Haitian, Zhenxiong, Sumitomo, Toshiba, Engel, KraussMaffei, Trumpf, Bystronic, Han's Laser, Huagong, LK, and Yizumi, and can record faults.

Application Scenarios