LM series twin screw air cooled cold(hot) water chiller

Gree modular air cooled screw water chiller is a real application of Gree rich experience in the design, collect numerous scientific and technological achievements: a high-performance twin-screw compressor, low noise axial fan, high-precision grade electronic expansion valves and advanced control systems , provide you the best air conditioning solution.

* Modular design

* High energy efficiency

* Stable operation,high reliability

* Low noise

* Convenience to maintenance

* Intelligent control

Dilute the main modules and sub-modules

Dilute the main module and sub-module, combined units, any one can be used as the main module, coordinate whole system to work on demand. Start or shut off according to Compressor total running time, each compressor balanced operation, effectively extending the service life of the unit

Top quality refrigeration parts:

1. Industry-leading performance expansion

Good Scalable, the original system can add new modules to expand the capacity of the units, bringing great convenience for the system improvement, each system can be a combination of four modules, the maximum cooling capacity reach up to 2000kw.

Flexible combination, for the same series products, not only the same model can be combined, but in any combination among different models

3. finite element method design

.Unit design based finite element method , the key parts and components was optimized to ensure reliability during Unit running.

Multi gloove tube plate technology

Water side heat exchanger adopt dry shell and tube heat exchangers, compared with other manufacturers of dry shell and tube heat exchangers, abandon the traditional single-tank tube plate hole design. through optimizing the design of the tube plate, greatly reduces the risk of leakage, improve the reliability of unit operation

5. Unique motor chamber cooling technology

Conventional air cooled screw unit uses thermal expansion valve to control liquid refrigerant to eject, to down the compressor motor chamber temperature.thermostatic expansion valve control delays, low accuracy. Gree LM series screw air cooled cold (hot) water unit use liquid spray electronic expansion valve to control, high spray liquid precise , can adapt to different working conditions and different load requirements, ensure reliable operation of the compressor motor

6. Supercooling tube design

In the units heating, not pass heat exchange tube at the bottom of fin, can prevented defrost water freezes at bottom of fin

When the unit is defrosting, add cold pipe at bottom of fin, good defrosting effect

7. patented prevent frostbite technology

Units have multiple freeze-proofing design, including refrigeration freeze-proofing, automatic winter prevent frostbite, and shell and tube prevent frostbite. In the processing of unit running, stand by and fault conditions effectively prevent the shell and tube heat exchanger cracking. Especially the unit under fault conditions, use the industry's original shell and tube with hot prevent frostbite technology, can effectively protect the shell and tube heat exchanger is not bursted

8. intelligent defrost

Use Gree dedicated intelligent defrost control logic, through the comprehensive evaluation system parameters to optimize the time of enter the defrost cycle, can effectively determine defrost demand, so achieve defrost in time, no frost stop. Both to avoid unnecessary heat loss, but also improves the stability of the air-conditioning hot water temperature,better heating performance

9. Capacity adjustment settings,perfect match

Compressor adopt stepless adjustment

Compressor started at minimum load,the grid impact is minimal

Stepless slid valve adjust units capacity,full match real load

10.New throttling,more precise control

According to real units running conditions, automatically count system degree of superheat, and quickly adjust, real time ensure system optimal running status

Electronic expansion valve can precise adjust refrigerant quantity of flow

Guarantee units high efficient running under any load, wider adjustment range

11.Heat exchange tube

TURBO-B super efficient heat exchange tube, Refrigerant form a film in pipe wall, special heat transfer surface design for different mechanism of heat transfer and fluid medium, greatly improving the heat transfer of tube shell. meanwhile reducing the flow pressure loss along the way, reduce the unit energy consumption

Use high-effect high tooth rifled copper pipe as refilled pipe of units heat exchanger, compare with common refilled pipe, heat transfer improve over 10%

12. No distinction design between main module and sub-module

By adding advanced control logic concept, abandon the traditional master module design, each air-cooled screw machine of module no distinction, any one air-cooled screw unit is abnormal, other units can normal work .ensure cold supply of the entire system 

13. High-efficient oil separator. higher separation(proprietary technology)

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Gree LM series air cooled water chiller have very excellent technical properities.

1.Compressor

Gree screw air cooled water chiller adopt new generation high performance Two screw compressor,balance load,efficiently eliminate leak,greatly improve compression efficiency,compressor and motor direct connect and transmission,guiding valve stepless adjustment. integrate optimal refrigeration system and reliable control technology,ensure unit high efficiency operation no matter full load or part load

2.Draught Fan

1.Blade adopt airfoil profile design,reduce blade edge air turbulent flow,noise reduce down to 70dBA

2.high performance draught fan,low power,large wind flow

3.Draught fan according to high pressure side pressure grouping start or shut up control,when environment temperature is lower,only start part fan,reduce energy consumption.

3.Evaporator

Dual flow path design,greatly reduce shell tube flow resistance,improve evaporating temperature,improve units capacity and energy efficiency

4.Reverse M shape fin heat exchanger

Reverse M shape heat exchanger VS  V shape heat exchanger

a.higher strong construction

b. Reduce ventilating resistance,reduce fan input power,save electricity

c.Improve air flow speed distribute,fully utilize heat exchange tube surface,improve heat exchange efficiency.

d.Improve defrost performance

5.Supercooling tube design

Gree air cooled screw water chiller use unique supercooling tube design,greatly increase units subcooled temperature,sharply improve units cooling capacity and further improve units cooling performance

6.Use dry type shell tube heat exchanger

Use shell tube type heat exchanger,water flow among the heat exchange tube.wide heat exchange tube spacing design,not easy blocked by impurities and incrustation scale.avoid heat exchanger be damaged. if use board heat exchaner,water flow between boards,generally the spacing less than 3mm,when water hardness is higher,easy to produce incrustation scale and blocking,damage heat exchanger.

The advantage of dry type shell tube evaporator:

a.Less refrigerant fill,about 40% of tube inner volume,

b.The influence of refrigerant liquid static pressure is less

c.Refrigerant flow in tube,flow speed is high,high oil return efficiency

d.Evaporator construction is compact,no easy to damage vulnerable parts,low maintenance charge

7.Comprehensive protection funtion

Units have comprehensive protection function,ensure units safety operation.

Power supply default phase protection,anti-phase protection,fan over current protection,motor overheat protection,freezing-proof protection,water flow switch protection,low flow volume alert,prevent frequently start function,high voltage protection,low voltage protection,gas exhaust high temperature protection,system voltage difference protection,,automatic antifreezing function,low oil level protection,safety valve protection,sensor default protection,compressor overload protection,oil pressure difference protection,heating prevent overheat protection,cooling prevent freezing protection,low degree of super heat of gas exhaust ,thermal bulb default protection,

other safety control measures,such as pressure too high,too low,high current unload function,compressor oil heater control function,minimum duration control function etc.

these function can efficiently improve units operation reliability.