Introduction
    Yu Jiang wind-cold low temperature screw-shaft type cold water machine products use imported well-known semi-closed low temperature screw-shaft type air compressor with the condenser, evaporator of high efficiency, intermediary heat exchanger and Cooling Units and control components that 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 machines that our company produce are calculated and tested with accuracy to make rational superior design; the machine is tested at the running test centre, out-factoring once meeting technical requirements, therefore the machine has high efficiency, good quality, less incidents, providing customers with the best products.

Working principle
    Wind-cold low temperature screw-shaft type cold water machine uses wind for cooling, high temperature high pressure gaseous refrigerant escaping from the air compressor going through the winged condenser and heat dissipation ventilator for chilling to become low temperature high pressure liquid refrigerant, then going through expansion valve to provide low temperature low pressure liquid refrigerant for evaporator for evaporation to achieve chilling efficiencies, while the refrigerant reduces the required temperature down 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 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%, has such advantages as stable performance, high efficiency, low incident rate, 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)

Winged condenser and tubular evaporator
    Condenser : uses different heat exchanger copper tubes imported from Germany, Japan or domestically produced, the heat exchanger copper tubes of high efficiency are transparently threaded and the wind guide winged  is made of water permeable corrosion- resistant thin aluminum foils in parallel pairs, that expand the mechanical tube to tightly link the copper tubes and aluminum pieces together in order to maximize heat transfer efficiency, compact structure, small volume, light weight, high efficiency of heat exchange, easy cleaning 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 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 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