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CUWD - C type chiller is most advanced chiller designed by subsidiary of DAIKIN INDUSTRIES CO.,LTD the DAIKIN AIR-CONDITIONING(SHANGHAI)CO.,LTD HUIZHOU FACTORY. Adopting the most advanced
evaporator and condenser design, the most advanced concept to control the chiller.Not only inherit the stability and reliability of DAIKIN air conditioning but also improve the energy efficiency.It improves both the full load and part load energy efficiency.
● The entire system adopts the most advanced semi-hermetical single-screw compressor currently available in the compressor field. Its high efficiency, reliability, stability,maintenance and other aspects are second to none among similar products. One main forged steel screw meshes orthogonally with a pair of polymer composite gate rotors arranged symmetrically to compress. ● The exhaust and symmetry make the force on moving components completely balanced during mechanical operation, thereby ensuring reliability and stability during the unit's operation. ● The combination of reasonable compressor construction design and precise 3-D mechanical processing technology ensures minimum blowing by between high pressure and low pressure of the compressor, and keeps the compressor operate efficiently in wide range. ● The compressor goes through 12 compression cycles per rotation. The air discharge continuity becomes high, and the pressure pulsation is small, thereby greatly reducing the vibration and noise ● The symmetrically installed gate rotor is injection molded at high pressure using polyphenylene as raw material and polytetrafluoroethylene as auxiliary material, so it has high temperature resistance, wear resistance, tightness and self-lubricating performance. ● Due to perfect balance of force, the screw bearing's wear is minimized during operation; and high precision roller bearing is adopted to ensure the service life of 100,000 hours or more. It is two times or more of the service life of general twin-screw compressor.
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● The oil strainer of horizontal double structure achieves the oil separation effect of up to 99.5 percent. ● The compressor has no contact friction and the gate rotator is self lubricated, which results in low oil temperature and less lubrication demand when the compressor is in operation, so it is unnecessary to set the oil cooler, oil pump and other oil circuit components. At the same time, since the differential pressure oil feeding method is adopted to eliminate the need of complicated oil circuit system, the entire construction becomes simpler, the maintenance more convenient and the operation more reliable.
●The combination of a horizontal shell-tube condenser and a dry shell-tube evaporator features a concise structure and enables stable heat exchange, durable efficiency and easy maintenance. ●The condenser features a high-efficiency heat exchange tube with stable performance, further enhancing the heat exchange performance of heat exchanger and improving the chiller’ COP. ●The all-counter-flow dry evaporator boasting the latest European environmental concept, while retaining the advantages of traditional dry evaporators, makes a qualitative leap in the heat exchange effect. ●The condenser and evaporator are both designed, manufactured and tested in accordance with related national standards on pressure vessels(NB/T47012-2010,TSGR0004-2009).Each pressure vessel has been inspected and approved by the related national quality department.
●The unit operation display adopts large-size LCD touch panel. It can display the
operating condition in many languages (Chinese/English). And it is possible to carry out various settings. ●It is possible to change the starting sequence of the compressor. ●When the unit leaves the factory, the electric motor wiring and duct pilot wiring of compressor have been connected and undergone insulation test and withstand voltage test. ●The unit can go into field operation after it is connected to power source and necessary water pump interlocking line. ●The program controller has the following functions: stat us display, temperature setting, selection of operating mode and abnormity display. ●Startup and shutdown of the unit can be carried out through the operation panel or remote control. ●There are several special and standby contacts in the electric cabinet, which can be used to connect telecommunication line, water pump interlocking line, remote control alarming line and other control lines.
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●Capacity control carries out infinitely variable control of 25~100% over each
compressor by monitoring temperature sensor through program controller and sending action command to capacity regulating motor. ●The operation panel can display all parameters and the operational state of various control elements during the operation of the unit. ●The outlet temperature of chilled water can be setted upon request of the user. ●In the event of unit abnormity, LCD touch panel will automatically pop up fault picture together with the content and reason of abnormity. It is conducive to confirming the state of abnormity and immediately clearing the fault. Starting manner of Y to is adopted by the compressor to guarantee that the compressor can be smoothly started at low voltage. ●The RS-485 connection port is optional configuration for the CUWD-C type chiller,the Bacnet connection port is also optional configuration for the CUWD-C type chiller.
●In the dual system chillers, When a refrigeration circuit compressor or other system components are abnormal, another refrigeration circuit can be still running to ensure the independence of the system. ●The refrigerating circuit is equipped with high efficient device for drying and filtering which is used to remove the water and impurities in the refrigerant so as to guarantee the reliability of refrigeration cycle. ●Effective control of electronic expansion valve evaporator outlet refrigerant superheat steam by ensure adequate sufficient cooling supply. Refrigerant pipe provided with a refrigerant compressor with oil-filled valves and valve. ●All solenoid valves in the refrigerating circuit are equipped with small check valve, which makes it easier to replace the parts.
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●Single-screw compressor is developed on the basis of twin-screw compressor. It adopts orthogonal structure in gas compression and avoids the "leakage triangle" of twin-screw compressor, thereby improving the compression efficiency of the compressor by 5%. ●The single-screw compressor can have efficient operation of 12 compressions in one cycle. The force applied to the main screw during the operation is quite balanced. Comparing with twin-screw compressor, it can avoid the leakage of refrigerant from high-pressure side to low-pressure side in terms of structure and reduce energy loss, thereby enabling the compressor to maintain great mechanical efficiency in long cycle.
●Before it leaves the factory, the unit has undergone strict and all-around trial operation test to guarantee the operation reliability of the unit. ●The unit will be transported as a whole. After installation, the unit can go into field operation after it is connected to power source and water source. It is quite convenient to carry out installation and commissioning. ●The unit produces is with low vibration and without any special requirement for installation site. ●The recommended repair cycle of the compressor is over 40,000 hours. ●After the unit is put into operation, it can maintain unattended operation thanks to its simple structure, low fault rate and plenty automatic protection and adjusting devices.
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About condensation The use of insulation material products generally have the following properties, but after use, the situation has changed.
In chiller operation, water quality management and survey beforehand are very important work cause chilled water, cooling water quality have a great impact on the chiller performance and life time. As for the water quality standards, please refer to the following table. Cycling water in the cooling tower are evaporated because chilled water, it will have solute concentration effect. Water supply and water quality monitoring by circulating water respectively to ensure a certain amount of water supply and flow of circulating water within the standard range. Water quality standard for condenser water, chilled water,hot water and make-up water (JRA GL-02-1994"Guideline of water for refrigerators and air conditioning equipment") JRA:Japan Refrigeration & Air Conditioning Industry Association
Notes (1)The “○” marks in the columns on the right indicate tendency for corrosion or scale to develop. (2)Corrosion has a tendency to occur when water temperature is high(40C°or high),and if metals with no protective coating whatever are directly exposed to water, it would be a good idea to take effective measures against corrosion such as adding a corrosion inhibitor or deaeration treatment. (3)Supply or make-up water should be tap water (from water-works) or water for industrial use. Pure water, natural water should not be used
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