GREE CAC Technical Seminar GREE Photovoltaic DC Inverter Centrifugal Chiller Doha,Qatar Feb.20 th.2016
Petroleum and nature gas can be consumed for only 50 years Coal can be consumed for only 100 years By Y2020,copper,aluminium,tin and zinc will be mined completely. The energy depletion and environmental pollution is indeed threatening our life.
Air conditioner, especially the Central Air Conditioner takes over 60% of the energy consumption in the building.
How to find GREEN Energy Source for the Central Air Conditioners becomes a big challenge for the HVAC industry. GREE, as the world leading HVAC solution provider, we are the first manufacturer to develop the high efficient DC Inverter Centrifugal Chiller with Solar Power application.
GREE PV DC Inverter Centrifugal Chiller Contents 1 GREE Milestones For Centrifugal Chiller 2 GREE CVE Series DC Inverter Centrifugal Chiller 3 GREE CVS Series Photovoltaic DC Inverter Centrifugal Chiller
1 GREE Milestones For Centrifugal Chiller
GREE Milestones For Centrifugal Chiller 2005 2006 The first Chinacreated The first Magnetic Centrifugal Turbocor Centrifugal Chiller Chiller IPLV=6.7 IPLV=13 2008 The first generation Inverter Centrifugal Chiller IPLV=9.6 2013 High Efficiency DC Inverter Centrifugal Chiller IPLV=11.68 2014
2 GREE CVE DC Inverter Centrifugal Chiller Product Range Product Innovative Features Product Application Case Study
GREE CVE Series DC Inverter Centrifugal Chiller Product Range The capacity range of GREE DC Inverter Centrifugal Chiller is from 250Tons to 1500 Tons, which is the largest Inverter Centrifugal Chiller in the wolrd with DC Inverter Compressor Motor.
GREE CVE Series DC Inverter Centrifugal Chiller Product Innovative features High-speed direct-drive two-stage impeller Low viscosity vaned diffuser technology Air makeup and enthalpy gain via two-stage compression High-speed PMS varied-speed motor Four-quadrant airborne inverter All-condition wideband pneumatic design technology
GREE CVE Series DC Inverter Centrifugal Chiller Product Innovative features High-speed direct-drive two-stage impeller Low viscosity vaned diffuser technology Air makeup and enthalpy gain via two-stage compression High-speed PMS varied-speed motor Four-quadrant airborne inverter All-condition wideband pneumatic design technology
GREE CVE Series DC Inverter Centrifugal Chiller Product Innovative features High-speed direct-drive two-stage impeller Impeller Growth Gear Motor Conventional single-stage compressor
GREE CVE Series DC Inverter Centrifugal Chiller Product Innovative features High-speed Direct-drive Two-Stage Impeller Impeller Growth Gear Motor Conventional Single-Stage compressor
GREE CVE Series DC Inverter Centrifugal Chiller Product Innovative features High-speed Direct-drive Two-stage Impeller Two-stage Impeller High-speed PMSM GREE DC Inverter Two-Stage Centrifugal Compressor
GREE CVE Series DC Inverter Centrifugal Chiller Product Innovative features High-speed Direct-drive Two-stage Impeller Two-stage Impeller High-speed PMSM GREE DC Inverter Two-Stage Centrifugal Compressor
DC Inverter Two-stage Centrifugal Compressor Comparison between single stage compressor and DC Inverter Two-stage compressor Growth Gear Motor Two-stage Impeller Single Stage Centrifugal Compressor High-speed PMSM
Comparison between single stage compressor and DC Inverter Two-stage compressor Less Mechanical Loss with DC Inverter Compressor 20 Mechanical loss (kw) 16 12 8 4 DC Inverter AC Inverter Fixed Frequency 0 0 20 40 60 80 100 120 load (%) The compressor mechanical loss of 650RT unit is only 1~ 4 kw, dropped 10 kw compared with the fixed-frequency unit. At the 25% load, the power of 650RT unit is about 60kW, mechanical loss is reduced by 16.7%.
Product Innovative features Lower Noise for the DC Inverter Compressor Noise Comparison of Compressors (650RT) Traditional Centrifugal Compressor 90dBA DC inverter Centrifugal Compressor 80dBA 80dBA The growth gear of DC Inverter Two-Stage Compressors is removed,without high-frequency noise of the gear, the compressor noise is much lower, only 80dBA.
Product Innovative features Compact Design for DC Inverter Compressor Dc Inverter Centrifugal Compressor (650RT) L W H (mm): 1400 700 720 Weight (kg): 1200 Traditional Centrifugal Compressor (650RT) L W H (mm): 2300 1100 1000 Weight (kg): 2980 Because of cancelling growth gear, the compressor overall size decreases, the volume and weight of the DC inverter centrifugal compressor is only 40% of the same capacity traditional compressor.
Product Innovative features High-speed direct-drive two-stage impeller Low viscosity vaned diffuser technology Air makeup and enthalpy gain via two-stage compression High-speed PMS variedspeed motor Four-quadrant airborne inverter All-condition wideband pneumatic design technology
系系系 Product Innovative features All-condition wideband 1. pneumatic 0N design technology 0. 86 0. 84 0. 86N Patent Technology 0. 82 1. 1N 系系系系系系系系 Pr 2.6 2.4 2.0 1.8 1.6 1.4 1.2 0. 8 系 Pressure 系 Ratio 0. 68N 0. 75N Design target curve Surge 系系系 line 0. 82 0. 8 stage efficiency 系系 cycle 系系 25% 0. 84 0. 68N 0. 86 50% 0. 75N 75% 0. 86N 100% Compressor operation characteristic curve 1. 0N Qv AC operation condition 系系系系 line 系系系 Variable 系系 speed 系系系 stage 系系系 characteristic curve Flow 系系 Q "Full Process" design method. The optimization design of the impeller and the diffuser can realize the high-efficiency operation of the compressor under the load range 25-100%. Compared with the traditional method of full load operation, it makes the efficiency loss of the compressor much lower. Refrigerant flow is simply controlled through the varied speed of the compressor, and the throttling loss can be reduced largely in this way.
Product Innovative features Comparison of the capacity control logic Cooling water inlet temp.( C) 系系系系系系系 / C 35 Hot 系系 gas 系 bypass 系 + 系 +Impeller+speed adjustment 系 + 系系系系 30 25 Guide 系系系 blade 系系 speed adjustment 系系系系 control +speed 系 + 系系系系 adjustment 20 15 10 0 20 40 60 80 100 Load(%) 系系 ( %) Cooling water inlet temp.( C) 系系系系系系系 / C 35 30 25 Hot 系系 gas 系 bypass 系 + 系系 +speed adjustment+impeller + 系系系系 Guide 系系系 blade 系系 control+speed 系 + 系系系系 speed 系系 adjustment 系系 adjustment 20 15 10 0 20 40 60 80 100 Load(%) 系系 ( %) Traditional Inverter Centrifugal Chiller GREE DC Inverter Centrifugal Chiller The traditional inverter centrifugal chiller realizes the capacity control by the variable speed of the compressor and the variable opening angle of the guide vane which begins under the load of 50~60%. This DC inverter centrifugal chiller can realize this by directly changing the speed of the compressor so that the throttling loss will be reduced greatly at the 25% load.
Product Innovative features Guide vane opening/efficiency curve 0.9 Guide vane opening 110 Adiabatic Efficiency 0.85 0.8 0.75 0.7 efficiency curve 22% 100 90 80 70 Guide vane opening(%) 60 50 40 30 20 Insulation efficiency for wideband design Typical AC insulation efficiency Typical AC guide vane opening Guide vane opening for wideband design 0.65 10 0% 25% 50% 75% 100% load The efficiency under Full process can reach more than 0.83. Compared with conventional compressor, the efficiency increases 22% at 25% load.
Product Innovative features High-speed direct-drive two-stage impeller Low viscosity vaned diffuser technology Air makeup and enthalpy gain via two-stage compression High-speed PMS varied-speed motor Four-quadrant airborne inverter All-condition wideband pneumatic design technology
Product Innovative features "Low viscosity vaned diffuser technology Airfoil guide vane Patented Technology Unique Low viscosity vaned diffuser design and Airfoil guide vane, effictively making high-speed gas convert into high static pressure gas and realize pressure recovery with high efficiency. In partial load, the vane diversion effectively reduces backflow loss, improves the performance in partial load, and expands the scope of the unit operation. The unit performance of partial load can be promoted more than 8%.
Product Innovative features High-speed direct-drive two-stage impeller Low viscosity vaned diffuser technology Air makeup and enthalpy gain via two-stage compression High-speed PMS varied-speed motor Four-quadrant airborne inverter All-condition wideband pneumatic design technology
Product Innovative features High-speed PMS varied-speed motor The First 400kW Motor Rotating Speed 12000rpm The rotor structure design: When the rotor is too big, the permanent magnets will be damaged easily; when the rotor is too small, the output will be insufficient. Magnetic circuit designed for both high and low speed. Eliminate resonance and harmonic. High-speed bearing design. Rotor First high power and high-speed permanent magnet synchronous frequency control motor of refrigeration centrifugal compressor. The power of motor is more than 400 kw, and the rotate speed is more than12000 rpm.
Product Innovative features High-speed PMS varied-speed motor Motor with high efficiency PMS motor, with the permanent magnetic rotor and no excitation loss; Maximum torque/minimal current rector control, with less tear and wear to the motor; Optimized air-gap magnetic field waveform, with less harmonic loss. efficiency 0.98 0.96 0.94 Unit operation scope 0.92 2000 4000 6000 8000 10000 12000 rotate speed Within the scope of unit operation, the motor efficiency were above 96%, the highest efficiency is 97.5%, more than national motor GRADE ONE energy saving level. The efficiency is promoted up to 4%.
Product Innovative features High-speed direct-drive two-stage impeller Low viscosity vaned diffuser technology Air makeup and enthalpy gain via two-stage compression High-speed PMS varied-speed motor Four-quadrant airborne inverter All-condition wideband pneumatic design technology
Product Innovative features Four-quadrant airborne inverter Conventional inverter technology Ac circuit motor Input rectifier Options: installation harmonic filter Linear control or capacitor reduce harmonic content. Diode conversion AC into the DC. DC bus Inverter Capacitor make the current level off and storage, then send it to the inverter. Transistor, accurate control the power that send to the motor.
Product Innovative features Four-quadrant airborne inverter GREE DC Inverter Technology AC Circuit Motor Active front end (AFE) rectifier DC bus Inverter Four-quadrant green inverter,igbt Transistor instead of the traditional diode rectifier to better control time and way of the power output, and fully suppress the harmonic.
Product Innovative features Four-quadrant airborne inverter Low THD value (Total harmonic distortion) Current waveform of traditional Inverter Current waveform of GREE DC Inverter CVE centrifugal chiller use the PWM controlled rectifying technology, total harmonic distortion rate THD < 5%; No auxiliary circuit reactance and harmonic isolation implement, reduce the cost of users; Especially suitable for scientific research institutions, hospitals, factories & schools,which need low harmonic interference.
Product Innovative features Four-quadrant airborne inverter Low THD value (Total harmonic distortion) 40% GREE CVE Traditional inverter 30% 20% 10% 0% Current waveform of GREE DC Inverter THD comparison CVE centrifugal chiller use the PWM controlled rectifying technology, total harmonic distortion rate THD < 5%; No auxiliary circuit reactance and harmonic isolation implement, reduce the cost of users; Especially suitable for scientific research institutions, hospitals, factories & schools, which need low harmonic interference.
Product Innovative features High-speed direct-drive two-stage impeller Low viscosity vaned diffuser technology Air makeup and enthalpy gain via two-stage compression High-speed PMS varied-speed motor Four-quadrant airborne inverter All-condition wideband pneumatic design technology
Product Innovative features Air makeup and enthalpy gain via two-stage compression Leading technology The two-stage compression, circulation system of high efficiency; Compared with single stage compression, the rotating speed is lower, and the reliability is higher. Condensing Save power single-stage compression Throttling compression Evaporation Refrigerating capacity increase The P-h figure of cycle Two-stage compression Compared with the single-stage refrigeration system, the two-stage compression fill gas circulation is the best choice, and it can improve the circulation efficiency 5 ~ 6%.
Product Application Case Study Project Cases Study Refrigerating capacity (kw) DC Inverter Centrifugal Chiller Fixed frequency Centrifugal Chiller 2285 2285 COP 11.2 6.7 Performance improvements 67% Running time (h) 2500 2500 Power consumption (kw h) 3570313 5968284 Power saved (kw h) / 2397971 Saving ratio / 40% Cost saved (RMB) 2637768 Coal saved (Ton) 969 Reduction of CO 2 emissions (Ton) 2391 Project area: 100000m 2 Required Cooling load: 1600 kw Type:DC Inverter Centrifugal Chiller Annual runtime: 2500h Payback period for New project : = 7 x 0.2million / 2.63million = 0.53 years Payback period for Replacement project = 7 x 1 million / 2.63 million = 2.6 years Note: 1 KWh =1.1 yuan= 0.404kg coal= 0.997kg CO 2 emission.
3 GREE CVS Series Photovoltaic DC Inverter Centrifugal Chiller System Composition--3 Systems Product Innovative Technologies System Operating Modes Typical Project Application
System Composition--3 Systems System 1: HVAC System
System Composition--3 Systems System-2:Photovoltaic System
System Composition--3 Systems System-2:Intelligent Management System
Product Innovative Technologies PV Direct-driven Technology Ternary Commutation Technology 5 Core Technologies MPPT Technology Power Integrated Management Technology PAWM Technology
Product Innovative Technologies PV direct-driven tech Traditional Gree Unique Solution Solution 12 Utilization of PV power: 99% Energy efficiency: 6%~8% Interconnected inverter Confluence unit Solar cell array DC busbar Centrifugal Chiller Current converter Public power supply
Product Innovative Technologies System Advantage Traditional PV AC Application DC AC PV sub-assy PV inverter Traditional AC GREE PV Direct-driven Inverter Chiller PV sub-assy DC Save equipment Save transition Total equipment cost is reduced by 10%, Lower wastage & larger power generation. PV direct-driven inverter centrifugal chiller
Product Innovative Technologies With Maximum Power Point Tracking Tech: System can cancel the stabilizing unit. PV power will be utilized prevail. PV power can be best utilized, up to 99% Confluence unit Stabilizing Unit
Product Innovative Technologies With Pulse Amplitude-Width Modulation interleaving control tech: Respond quick change of PV voltage and dynamic requirement of compressor load in real-time. Realize the self-adaptation control of compressor. Assure stable and reliable operation of system.
Product Innovative Technologies Intelligent management for power. Analysis the relationship between AC load and solar irradiance, adjust operation control strategy automatically. Improving the utilization ration of PV power.
Product Innovative Technologies Ternary current inversion among: PV system, Centrifugal chiller & Power line. It takes less than 10ms to switch to any of the 5 working modes. PV System PV Sub-assy Confluence & Distribution Load Power line Current converter
System Operating Modes Pure AC mode PV AC & Power consumption mode PV AC & Power generation mode 5 Operating modes Pure PV mode PV AC mode
System Operating Modes When PV generation is not available, Chiller will be powered by commercial power. Confluence unit Current converter
System Operating Modes When the Chiller is turned off Confluence unit Current converter
System Operating Modes When PV power generation is equal to AC power consumption: Confluence unit Current converter
Current converter System Operating Modes When PV power generation is more than AC power consumption: Confluence unit
Current converter System Operating Modes When PV power generation is less than AC power consumption: Confluence unit
Typical Project Application Total Area 8000 m 2 Type of PV plate Total capacity System name (System 1) PV power generation System for lighting Multicrystal silicon 803kWp (System 2) PV Direct-driven Inverter Centrifugal Chiller Project area 4110m 2 3890m 2 No. of PV plate 1650 pieces 1562 pieces System capacity 412.5kWp 390.5kWp
Typical Project Application Power Generation 831600 kwh per year. Free Electricity, save 140000 USD per year.
Typical Project Application Save fuel 216200 (L) Save coal 299.38 (ton)
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