1. Large Tonnage Chiller WC Centrifugal

2. Content Mechanical System Key Components Motor Starters Application 2

3. Mechanical System 3

4. Layout 4 EconomizerCentrifugal Compressor Shell & Tube Condenser Full falling film Evaporator Control Panel

5. Layout 5 ChillerStarter

6. 6

7. 7

8. Key Components 8

9. Compressor Motor Gear Box Compressor

10. 10

11. Compressor 11 ◇ IGV movable diffuser (Patent no. : ZL01 2 56825.2). Benefits: Elimination of Surge

12. Compressor 12

13. Compressor 13 Enclosed motor Open-type motor Evaporator Condenser MotorGear Impeller Entry guide vane Coupling Oil leakage of shaft seal Oil bottle

14. Compressor 14 Item Open-typeSemi-hermetic Key characteristics 1. Refrigerant spraying cooling; 2. The motor's operation environment is good and clean, and the service life is long; 3. The operating temperature is not affected by the external environment and the operating efficiency remains high; 4. No dedicated ventilation and air-conditioning equipment is needed for the equipment room, lowering the initial investment and operation costs; 5. The motor shaft is a large-gear shaft, preventing decentraction of the coupling; 6. IP54 protection grade is realized. 1. Open-type air-cooled motor, low cooling efficiency, loud noise, and large body; 2. the equipment room needs effective ventilation and cooling facilities, which should be able to maintain appropriate humidity, thus increasing power consumption; 3. the operation environmental temperature of the motor is high, shortening the service life; 4. the inspection and maintenance period is short and working intensity is high; 5. the alignment calibration of the motor, shaft seal and compressor is a key link of the operation process; flange connection is adopted, unlike soft connection that can absorb impacts in case of failures; if the coupling becomes a vibration source without proper measures, the failure rate of other parts such as the oil circuit will increase; the unit vibration is increased; 6. IP23 protection grade is realized. Impacts on the power grid The starting current is high, leading to a large impact on the power grid. Expensive software starter or frequency converter is needed to reduce the impact on the power grid. The starting current is low, with a small impact on the power grid. Running noises The noises are loud because the motor is exposed Low noises Market share It is an alternative product manufactured by one or two companies. It is mainly used for low-temperature cooling. It is a mainstream product, which takes up a market share of over 80%. Motor protection High-temperature protection and over-current protection (Midea takes the following measures: 1. embedded PTC high-temperature protection; 2. PLC over-current protection; 3. thermal relay over-current protection. Different manufacturers take similar methods.)

15. Compressor 15 Enclosed impeller Open-type impeller Refrigera nt gas Discharge direction Suction direction

16. Compressor 16 ItemEnclosedOpen Leakage Low, enclosed structure, no leakage caused by tolerance clearance in the compression process High, leakage of compression gas caused by tolerance clearance during starting, load increasing and decreasing of the compressor. Efficiency High level and stable operation, with few fluctuation The efficiency drops with the service duration. Repair and maintenanc e Convenient maintenance and low maintenance cost Open structure, hard-to-maintain; the later maintenance cost is high due to leakage of refrigerant WearingLittle wearing Open-type, high requirement for precision tolerance (high-precision clearance fit between the impeller and compressor), causing wearing easily. Market share Over 95%Only used by one or two companies in the field

17. Compressor 17 Gear acceleration transmissionDirect motor driving

18. Compressor 18 ItemFeatures Gear acceleration transmission Compact unit structure, small body; relatively loud noises; wide application scope The main bearing surface is made of babbitt metal, with high intensity and oxidation resistance. Direct connect motor transmission The unit is large, but with low noises. Note: TRANE CVGF series adopts gear acceleration transmission.

19. Compressor 19

20. Compressor

21. Motor starters 21

22. 22 Starter type Type Full voltage Cross the line Reduce voltage Closed Y- ∆ Auto transformer Primary reactor Solid state VFD

23. 23 Closed Star Delta Application: < 690V Advantage: Start Ampere: 33% of LRA; Reduce transition tap inrush ampere. Disadvantage: Starting torque is 33% of cross the line and cannot change; Only the motor with 3 phase, 6 poles available.

24. 24 Solid State Starter Application: < 690V Advantage: Start Ampere: 45% of LRA; No transition tap inrush ampere. The starting torque can be set. Disadvantage: High price; Harmonic during starting.

25. 25 VFD Starter Application: All Advantage: Start Ampere: Smoothly and FLA; No tap inrush ampere. Energy saving in part load. Disadvantage: High price; Harmonic during starting.

26. 26 Across The Line Application: 6kV, 10kV, 11kV, 13.8kV Advantage: Start Ampere: 100% of LRA; Large starting torque. Starter is simple and low price. Disadvantage: High tap inrush ampere;

27. 27 Auto Transformer Application: 10kV, 11kV, 13.8kV Advantage: Start Ampere: 33% ~ 64% of LRA; Starting torque can be set. Disadvantage: Large dimension and high price;

28. 28 Primary Reactor Application: 10kV, 11kV, 13.8kV Advantage: Start Ampere: 65% / 80% of LRA; Starting torque can be set. Disadvantage: Large dimension and high price;

29. Applications 29

30. 30 Series System Parallel System Storage

31. 31 COND: E/LWT 32/37 ℃  32/40 ℃. EVA: E/LWT 7/12 ℃  5/13 ℃. ∆T 5 ℃  8 ℃

32. 32

33. 33 Thank You!