Water-cooled screw low-temperature refrigeration unit -25℃

A water-cooled screw-type low-temperature refrigeration unit is a specialized refrigeration equipment designed for refrigerants at temperatures ranging from -35℃ to 5℃, suitable for various applications requiring low-temperature refrigerants below 5 degrees. It is widely used as a cold source in the production processes of non-ferrous metal metallurgy, chemicals and pharmaceutical intermediates, petrochemicals, grain and oil, food and beverage, machinery, medicine, electronics, air separation, new materials, aerospace, optoelectronics technology, new energy, and energy-saving and environmental protection.

The HHW series water-cooled screw-type low-temperature refrigeration units produced by Huihui Refrigeration can provide the main units of various process cold sources with a certain concentration of ethylene glycol water solution or calcium chloride water solution ranging from -35 to 5°C. This series of low-temperature chillers is mainly composed of several major components, including screw refrigeration compressors, oil separators, shell-and-tube heat exchangers, economizers, expansion valves, desiccant filters, and PLC control systems.

Product Design Features

◆ Featuring an imported high-efficiency and economic semi-hermetic twin-screw compressor, the equipment boasts high energy efficiency, reliable operation, and long service life. The compressors of each refrigeration system start with a star-delta voltage reduction under minimum load (25%), effectively reducing the starting current and impact on the power grid.

◆ The compressor is equipped with an exhaust silencer, ensuring low noise operation of the water-cooled screw type low-temperature refrigeration unit. The optional heat recovery model uses a heat exchanger technology, with summer heat recovery reaching 30% to 40% of the refrigeration capacity. For winter use, the heat recovery can be as high as 75% for the process water-cooled screw type low-temperature cooling unit.

◆ Screw-charged refrigeration compressors utilize internationally renowned brand screw-charged refrigeration compressors, with an efficient 5:6 third-generation asymmetric screw design.

◆ Semi-hermetic water-cooled screw industrial low-temperature refrigeration unit with a design featuring only three moving parts, boasts the advantages of fewer components and low failure rate. It allows for stepped or continuous energy adjustment, with flexible and convenient control, energy-saving, high efficiency, and easy maintenance.

◆Selected SKF and FAG precision, high-reliability zero-clearance thrust and radial bearings, featuring intricate structure and reliability.

◆The water-cooled screw-type low-temperature refrigeration unit employs a double-layer three-dimensional oil separator filter, which ensures excellent oil filtration and effectively guarantees the normal operation of the compressor and the efficient heat exchange of the heat exchanger.

◆ Utilizes a pumpless built-in differential pressure oil lubrication system, featuring energy-saving, high efficiency, and reliability. Designed with a special fluorine-resistant, low iron loss motor, equipped with a reliable motor overheating protection device, ensuring the motor operates efficiently and reliably.

◆CNS11870B7273 (IS0917, JISB8606) test system ensures that the compressor's factory performance meets 100% of design requirements. Installing a non-return valve at the exhaust outlet prevents the rotor from reversing during shutdown.

◆ Water-Cooled Screw Chiller Oil Separator Technology: Utilizes centrifugal spiral-type secondary oil separator to further separate refrigeration oil from exhaust gases, ensuring the unit operates efficiently and stably under low-temperature conditions, widely applicable for process低温 freezing requirements.

Electrical Control: All components for the start-up and control of the unit are installed within the electrical control box, wired by the factory, and fully functional tested. The electrical control section includes: a touch screen, Siemens PLC controller, main contactor, molded-case circuit breakers, etc. The equipment is equipped with an independent emergency stop device, ensuring the safety of the operators.

◆ A unique built-in hydraulic system ensures optimal lubrication for the compressor, with industrial-grade PLC control. This, combined with the energy regulation system of the compressor, allows for precise matching of the water-cooled screw-type low-temperature refrigeration unit to the required cooling load, ensuring the unit operates at peak efficiency and significantly reduces operating costs.

The Huihui HHHW series water-cooled screw-type low-temperature refrigeration units have completed the welding of the refrigerant piping, airtightness leak test, nitrogen pressure retention test, vacuum extraction test, and full-load performance test with refrigerant charging, fully meeting the qualified product requirements of industrial-grade industry standards.

For technical inquiries and solutions regarding water-cooled screw industrial low-temperature refrigeration units (-25℃), please contact Huihui Refrigeration. We are always ready to provide you with professional consultation and service.