Introduction
    Yu Jiang water-cool low temperature screw-shaft type cold water machine uses semi-closed low temperature screw-shaft type air compressor imported from well-known brands, high efficiency condenser, evaporator and intermediary heat exchanger and Cooling Units and control components  are the most famous in the globe, in technical cooperation with the Chinese Research Institute, required temperature can reach to -80℃; have such advantages as superior features, stable performance, simple manipulation, compact structure, good-looking appearance, regardless of use of Ethylene glycol or brine, required temperature 0℃～-80℃, our company can all make manufacture design at the requests from customers, low temperature screw-shaft type cold water machine that our company produces is calculated and tested with accuracy, to make rational superior design; tested at the running test center, out-factoring once meeting technical requirements, therefore the machine has high efficiency, good quality, less incidents, providing customers with the best products.

Working principle
    Water-cool low temperature screw-shaft type cold water machine uses water for cooling, high temperature high pressure gaseous refrigerant escaping from air compressor goes through tubular condenser and chilling tower to become low temperature high pressure liquid refrigerant, then goes through expansion valve to provide low temperature low pressure liquid refrigerant to tubular evaporator to achieve chilling efficiencies, while the refrigerating part reduces the required temperature to below  0℃ by Ethylene glycol or brine, to provide used equipment.
Scope of use: In industrial production sector to reduce the required temperature or in chilling that requires super-low temperature

Semi-closed low temperature screw-shaft air compressor
    Air compressor : uses semi-closed low temperature screw-shaft type air compressor of imported famous brand names such as HANBELL、BITZER、Ref Comp is designed with helical screw-shaft rotor of ultra-high efficiency at ratio of 5:6, has higher efficiency normal air compressors from 20%-30%, have such advantages as stable performance, high efficiency, low ratio of incidents, convenient maintenance. When all or part of the machine is in load operation, each air compressor can conduct single or multi-level control with the 75% -100% of the capacity
(Semi-closed screw-shaft type air compressor uses refrigerants such as R22, R134a, 404a, R407C, R407c)

Tubular condenser and evaporator
    Condenser : uses different heat exchanger copper tubes wholy imported from Germany, Japan or domestically produced, the outside of the copper tubes are processed in reinforced steel ladder that increase the heat exchange area, enhance the exchange heat, the inside of the copper tubes are polished to reduce water pressure, facilitate hygiene and maintenance
    With ethylene glycol as introducing agent, the evaporator uses internal thread high effective heat exchange copper tube, thereby increasing the heat exchange area, improving heat transfer efficiency, and saving energy.
    With brine as introducing agent, the evaporator is made by 316L stainless steel or copper alloy, which is resistant to alkali and corrosion, thereby increasing efficiency and longevity of the machine and helping maintain machine stable performance.
Cooling Units
    Cooling Units use world famous brand names such as DANFOSS ,ALCO,SPORLAN of top quality, superior features that help the machine makes full use of its high efficiency..

Electric control-system
    Electric control-system uses the PLC, PC smart touch screen control system in Chinese language, quick reaction, precise control, with automatic control of water required temperature and record of the causes of incidents, simple and easy to understand manipulation, and have automatic protection function that can prevent the machine from being damaged during operation, extend the life span of the machine and can perform remote control and central control

Protection devices 
    Overload protection devices of air compressor, over heat protection devices of coiler, overload protection devices of ventilator engine, protection devices of low-high pressure switch, phase protection devices (reverse-phase, phase shortage), protection devices of anti-freezing, safety valve or safety bolt, are best protecter of the machine