Gree industrial air conditioner CVE series DC inverter centrifugal water chiller

Gree central air conditioner CVE series DC inverter centrifugal chiller

Gree DC inverter centrifugal chillers was unanimously identified by experts of Academy of Sciences, Tsinghua University, Xi'an Jiaotong University, China Institute of Refrigeration, China Refrigeration and Air Conditioning Industry Association and other authorities as the world's first high-speed high-power DC inverter centrifugal chillers, reached the international advanced level
Gree CVE series DC inverter centrifuge chillers condensed the latest technological achievements of Gree central air conditioning research and development, have 100% independent intellectual property rights, compared with ordinary centrifugal chillers integrated part load performance increase more than 65%, is by far the most energy-efficient large-scale central air conditioning, the unit has outstanding energy efficiency, reliability and adaptability, widely be used in large office buildings, hospitals, schools, shopping malls and processes, and can direct replace units of the existing air conditioning systems for energy saving

Features:

1.High-speed motor direct-drive two-stage impeller

.Gree DC inverter centrifuge chiller adopt high-speed direct-drive motor dual-stage impeller structure, eliminating the conventional centrifuge overdrive gear means and the two radial bearings, which greatly reduces the mechanical loss of the unit, to improve the efficiency of the unit, to a 650RT compressors, mechanical loss less than 4KW, compared with conventional centrifuge with gear over-drive device, reducing mechanical losses 10KW, the decline over 70%.
Direct drive, more simple construction, more reliable running, smaller overall size of the compressor, the size and weight of compressor is only 40% of conventional compressors with the same refrigeration capacity.
Cancel the overdrive gear, no gear high-frequency noise, lower of the compressor running, lower the traditional units 8dBA or more

2. Full conditions wide band aerodynamic design of technology.

Full condition design method: to 25-100% of the load optimize the wheel design, diffuser etc. achieve compressor’s high-efficiency running under all the load. Compared to the conventional full load design , reduces the attenuation of the compressor efficiency.
Conventional inverter centrifuge adopt variable speed+ guide vanes joint adjust refrigeration capacity, at 50-60% load is to start off turndown guide vane, reduce part load efficiency of these units, Gree DC inverter centrifugal load in the range of 25-100% by variable speed can achieve it, thereby reducing throttle loss of guide vanes to improve unit performance of full working condition.

3. high-speed permanent magnet synchronous frequency conversion motor.

The world's first dedicated high-power high-speed permanent magnet synchronous motors for centrifugal compressor refrigeration, power reach up to 400KW or more, speed reach up to 18000rpm or more, high efficiency motor, in the range of operation, the motor efficiency average over 96%, maximum reach up to 97.5% ,more than the level of national motor energy saving. Small size, light weight, 400kw high-speed permanent magnet synchronous motor, weighs only is equal to 75 AC induction motor. Small Starting current, adopt spiral surround refrigerant spray cooling technology, the motor stator and rotor fully cooled. Motor temperature field uniformity, can control the motor temperature at about 40 degrees, ensure the efficient operation of the motor

4. Airborne sine wave inverter

The patented technology of high-speed permanent magnet synchronous no Position Sensor precise control, without sensor, rotor position can be perceived, can constantly accurately monitor the angle position of the motor, improve reliability. Use PWM-controlled rectifier technology, make sure inverter to output the smooth sine wave, improve motor efficiency. Integrated design, inverter is mounted directly on the unit, greatly reducing the covering of the unit, save room area for customer.at same time, all communication connections are completed in the factory ,which improve the reliability of the unit

5. Low consistency vaned diffuser

Unique low consistency vaned diffuser design, airfoil blades for gas diversion, effective convert high-speed gas to high hydrostatic gas, achieve pressure recovery high efficiency ,at part load, the blade deflector effectively reduce reflux loss, improve part load performance, extended range of unit operation, unit performance improved significantly

6.Two-stage compress Increasing enthalpy by replenish gas technology

Adopt Two-stage compress Increasing enthalpy by replenish gas technology,
compared to single-stage refrigeration cycle system, circulatory efficiency improve 5-6% ,two-stage compression, reducing the rotational speed of the compressor, the compressor is more reliable, longer service life.

7.Unique impeller technology

Compressor blade wheel is a new efficient enclosed impeller designed according to the principle of three-dimensional flow, compared with open impeller enclosed impeller have higher efficiency and reliability. using three-dimensional structure airfoil impeller to reduce flow losses, make the impeller better adaptability while change working conditions, guarantee impeller higher performance in different working conditions. More efficient. Finite element analysis of strength through the impeller structure to ensure reliable running under high speed impeller. Meanwhile impeller tested by CMM, dynamic balance test and ultra-speed test, then the actual conditions of operation, to ensure the smooth operation and meet the design requirements. Impeller and spindle seamless connection to avoid local stress concentration and connections set produced additional imbalance to rotor, greatly improving the reliability of the compressor and running stability

8.New high-effective heat exchangers

The special design of heat transfer surface of high-efficient evaporation tube for different heat transfer mechanism and fluid medium, the heat transfer efficiency is optimal. Simultaneously reduce the flow pressure loss along the way, thus reducing energy consumption
Patented design of built-in subcooler is located in the bottom of the condenser, using a dedicated and efficient cold pipe, repeatedly baffled, effectively improve the degree of supercooling of unit, the maximum can be up to 5 degrees
At the separator In the middle of the unit ,where use a smooth pipe twice as thick as threaded pipe to enclosed connect the support plate through expansion, guarantee brass pipe will not collide with the brass plate of the support and generated impact damage under the high-speed refrigerant, Avoid malignant accidents caused by unit tube leakage.
"≡V"shape Groove pipe board hole design
In the process of heat transfer pipe and "≡V"shape pipe board expansion, have enough and homogeneous space, better expansion effect. The hole in" "shape pipe board is" ≡V" shape groove hole, can effectively ensure sealing property, avoid leak.

9.Advanced control platform.

Control systems use a dedicated high-performance 32-bit CPU and DSP digital signal processor, have very high data acquisition accuracy and superior data processing capabilities, ensure the real-time and accuracy of system control. Color LCD touch screen, ensure good man-machine exchange, easy to realize automatic control and manual control when debugging.The advanced Fuzzy - PID compound control algorithm.The control method combined smart technology, fuzzy technology and conventional PID control algorithm, ensuring that the system has faster response time, better steady-state performance

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