GREE Photovoltaic DC Inverter Centrifugal...
Transcript of GREE Photovoltaic DC Inverter Centrifugal...
GREE CAC Technical Seminar
GREE Photovoltaic DC
Inverter Centrifugal Chiller
Doha,Qatar
Feb.20th.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.
Contents
1
GREE CVS Series Photovoltaic DC Inverter Centrifugal Chiller 3
GREE CVE Series DC Inverter Centrifugal Chiller2
GREE PV DC Inverter Centrifugal Chiller
GREE Milestones For Centrifugal Chiller
GREE Milestones For Centrifugal Chiller1
2005 2006
2008
2013
GREE Milestones For Centrifugal Chiller
The first China-
created Centrifugal
Chiller
IPLV=6.7
The first Magnetic
Turbocor Centrifugal
Chiller
IPLV=13
The first generation
Inverter Centrifugal
Chiller
IPLV=9.6
High Efficiency
DC Inverter
Centrifugal Chiller
IPLV=11.68
2014
GREE CVE DC Inverter Centrifugal Chiller2
★ 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.
All-condition “wideband”
pneumatic design technology
High-speed direct-drive two-stage impeller
Air makeup and
enthalpy gain via
two-stage compression
★ Product Innovative features
“Low viscosity”
vaned diffuser
technology
High-speed PMS
varied-speed motor
Four-quadrant
airborne inverter
GREE CVE Series DC Inverter Centrifugal Chiller
High-speed direct-drive two-stage impeller
All-condition “wideband”
pneumatic design technology
Air makeup and
enthalpy gain via
two-stage compression
“Low viscosity”
vaned diffuser
technology
High-speed PMS
varied-speed motor
Four-quadrant
airborne inverter
GREE CVE Series DC Inverter Centrifugal Chiller
★ Product Innovative features
Conventional single-stage compressor
Impeller
Growth Gear Motor
GREE CVE Series DC Inverter Centrifugal Chiller★ Product Innovative features
High-speed direct-drive two-stage impeller
Conventional Single-Stage compressor
Impeller
Growth Gear Motor
GREE CVE Series DC Inverter Centrifugal Chiller★ Product Innovative features
High-speed Direct-drive Two-Stage Impeller
GREE DC Inverter Two-Stage Centrifugal Compressor
High-speed PMSM
Two-stage Impeller
GREE CVE Series DC Inverter Centrifugal Chiller★ Product Innovative features
High-speed Direct-drive Two-stage Impeller
GREE DC Inverter Two-Stage Centrifugal Compressor
High-speed PMSM
Two-stage Impeller
GREE CVE Series DC Inverter Centrifugal Chiller★ Product Innovative features
High-speed Direct-drive Two-stage Impeller
Growth Gear Motor
High-speed PMSM
Two-stage Impeller
DC Inverter Two-stage Centrifugal
Compressor
Comparison between single stage compressor and DC Inverter Two-stage
compressor
Single Stage Centrifugal Compressor
0 20 40 60 80 100 120 load
(%)
0
4
8
12
16
20
Mech
an
ical
loss (k
W)
DC Inverter
AC Inverter
Fixed Frequency
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%.
Less Mechanical Loss with DC Inverter Compressor
Comparison between single stage compressor and DC Inverter Two-stage
compressor
Noise Comparison of Compressors (650RT)
Lower Noise for the DC Inverter Compressor
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.
90dBA
80dBA
DC inverter Centrifugal
Compressor
Traditional Centrifugal Compressor
80dBA
★ Product Innovative features
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.
Dc Inverter Centrifugal Compressor
(650RT)
Traditional Centrifugal Compressor
(650RT)
L×W×H (mm): 2300×1100×1000
Weight (kg): 2980
L×W×H (mm): 1400×700×720
Weight (kg): 1200
Compact Design for DC Inverter Compressor
★ Product Innovative features
All-condition “wideband”
pneumatic design technology
High-speed direct-drive two-stage impeller
Air makeup and
enthalpy gain via
two-stage compression
“Low viscosity”
vaned diffuser
technology
High-speed PMS varied-
speed motor
Four-quadrant airborne
inverter
★ Product Innovative features
Compressor operation
characteristic curve
Design target curve
Patent Technology
"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.
Qv
Pr 系 系 系 系 系 系 系
0. 8
0. 82
0. 84
0. 86
系 系 系
1. 0N
0. 86N
0. 75N0. 68N
1. 1N
系 系 系 系 系 系 系 系
系 系 系 系
Q
Pr
100%
2.6
1.6
2.4
2.0
1.8
1.4
1.2
75%50%25%
系 系 系 系 系 系 系
系 系 系 系 系 系 系 系
系 系
系 系
1. 0N
系 系 系
系 系 系 系
0. 8
0. 82
0. 84
0. 86
0. 86N
0. 75N0. 68N
stage efficiency
cycle
Surge line
Pressure
Ratio
Flow
AC operation
condition line
Variable speed stage
characteristic curve
★ Product Innovative features
All-condition “wideband” pneumatic design technology
系系系系系系系
/C̊
系 系 ( %)
0 20 40 60 80 100
35
30
25
20
15
10
系 系 系 系 系
系 +系 系 系 系 系 系 系 系
系 系 系 系 +系 系
+系 系 系 系
GREE DC Inverter Centrifugal ChillerTraditional Inverter Centrifugal Chiller
Comparison of the capacity control logic
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.
Load(%)
Co
olin
g w
ate
r inle
t tem
p.(°
C)
系系系系系系系
/C̊
系 系 ( %)
0 20 40 60 80 100
35
30
25
20
15
10
系 系 系 系 系
系 +系 系 系 系系 系 系 系
系 系 系 系 +系
系 +系 系 系 系
Co
olin
g w
ate
r inle
t tem
p.(°
C)
Load(%)
Hot gas bypass+Impeller+speed adjustment
Guide blade
control +speed
adjustment
speed adjustment
Hot gas bypass+speed adjustment+Impeller
Guide blade
control+speed
adjustmentspeed adjustment
★ Product Innovative features
0.65 10
0.7
0.75
0.8
0.85
0.9
0% 25% 50% 75% 100%
20
30
40
50
60
70
80
90
100
110
Ad
iab
atic
Effic
ien
cy
Gu
ide
va
ne
op
en
ing
(%)
load
Insulation efficiency for wideband design
Typical AC insulation efficiency
Typical AC guide vane opening
Guide vane opening for wideband design
efficiency
curve
22%
Guide vane opening
Guide vane opening/efficiency curve
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
All-condition “wideband”
pneumatic design technology
High-speed direct-drive two-stage impeller
Air makeup and
enthalpy gain via
two-stage compression
“Low viscosity”
vaned diffuser
technology
High-speed PMS
varied-speed motor
Four-quadrant
airborne inverter
★ Product Innovative features
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%.
Airfoil guide vane
Patented
Technology
★ Product Innovative features
"Low viscosity” vaned diffuser technology
High-speed PMS
varied-speed motor
All-condition “wideband”
pneumatic design technology
High-speed direct-drive two-stage impeller
Air makeup and
enthalpy gain via
two-stage compression
“Low viscosity”
vaned diffuser
technology
Four-quadrant
airborne inverter
★ Product Innovative features
The First 400kW Motor
Rotating Speed 12000rpm
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.
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.
★ 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.0.92
0.94
0.96
0.98
2000 4000 6000 8000 10000
effic
ien
cy
rotate
speed
12000
Unit operation scope
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 PMS varied-speed motor
Four-quadrant
airborne inverter
High-speed PMS
varied-speed motor
All-condition “wideband”
pneumatic design technology
High-speed direct-drive two-stage impeller
Air makeup and
enthalpy gain via
two-stage compression
“Low viscosity”
vaned diffuser
technology
★ Product Innovative features
Conventional inverter technology
Options: installation harmonic filter
Input rectifier Inverter
DC bus
Linear control or capacitor
reduce harmonic content.
Diode conversion
AC into the DC.
Capacitor make the current
level off and storage, then
send it to the inverter.
Transistor, accurate control the
power that send to the motor.
Ac circuit motor
★ Product Innovative features
Four-quadrant airborne inverter
GREE DC Inverter Technology
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.
DC bus
AC Circuit Motor
Active front end
(AFE) rectifierInverter
★ Product Innovative features
Four-quadrant airborne inverter
Low THD value (Total harmonic distortion)
Current waveform of traditional 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.
Current waveform of GREE DC Inverter
★ Product Innovative features
Four-quadrant airborne inverter
Current waveform of GREE DC Inverter
0%
10%
20%
30%
40%
THD comparison
GREE CVE
Traditional 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.
Low THD value (Total harmonic distortion)
★ Product Innovative features
Four-quadrant airborne inverter
Air makeup and
enthalpy gain via
two-stage compression
Four-quadrant
airborne inverterHigh-speed PMS
varied-speed motor
All-condition “wideband”
pneumatic design technology
High-speed direct-drive two-stage impeller
“Low viscosity”
vaned diffuser
technology
★ Product Innovative features
Leading technology
Evaporation
Condensing
Throttlingcompression
Save power
Refrigerating capacity increase
The P-h figure of cycle
single-stage compression
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%.
The two-stage compression, circulation system of high efficiency; Compared with
single stage compression, the rotating speed is lower, and the reliability is higher.
★ Product Innovative features
Air makeup and enthalpy gain via two-stage compression
Project Cases Study
• Project area: 100000m2
• Required Cooling load: 1600 kW
• Type:DC Inverter Centrifugal Chiller
• Annual runtime: 2500h
DC Inverter
Centrifugal
Chiller
Fixed frequency
Centrifugal Chiller
Refrigerating capacity
(kW)2285 2285
COP 11.2 6.7
Performance
improvements67%
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 CO2
emissions (Ton)2391
Note: 1 KWh =1.1 yuan= 0.404kg coal= 0.997kg CO2 emission.
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
★ Product Application Case Study
GREE CVS Series Photovoltaic DC Inverter Centrifugal Chiller 3
★ System Composition--3 Systems
★ Product Innovative Technologies
★ System Operating Modes
★ Typical Project Application
★ System Composition--3 Systems
System 1: HVAC System
System-2:Photovoltaic System
★ System Composition--3 Systems
★ System Composition--3 Systems
System-2:Intelligent Management System
5 Core
Technologies
PV
Direct-driven
Technology
MPPT
Technology
PAWM
Technology
Power
Integrated
Management
Technology
Ternary
Commutation
Technology
★ Product Innovative Technologies
PV direct-driven tech
Public power
supplyCurrent converter
DC busbar
Traditional Solution 1Traditional Solution 2Gree Unique Solution
Utilization of PV power: 99%
Energy efficiency: 6%~8%Interconnected inverter
Centrifugal Chiller
Solar cell array
Confluence
unit
★ Product Innovative Technologies
GREE PV Direct-driven Inverter Chiller
DC
Traditional ACPV sub-assy PV inverter
Traditional PV AC Application
Total equipment cost is reduced by 10%,Lower wastage & larger power generation.
PV sub-assy PV direct-driven inverter centrifugal chiller
DC
AC
Save equipmentSave transition
System Advantage
★ Product Innovative Technologies
PV power can be best utilized, up to 99%
System can cancel the stabilizing unit.
StabilizingUnit
Confluence
unit
With Maximum Power Point Tracking Tech:
PV power will be utilized prevail.
★ 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
PVSub-assy
Confluence &
Distribution
PV System
Load
Current converter
Ternary current inversion among: PV system, Centrifugal chiller & Power line.
Power line
It takes less than 10ms to switch to any of the 5 working modes.
★ Product Innovative Technologies
5Operating
modes
Pure
AC mode
Pure
PV mode
PV
AC mode
PV AC &
Power
generation
mode
PV AC &
Power
consumption
mode
★ System Operating Modes
Confluence
unit
When PV generation is not available, Chiller will be powered by
commercial power.
Current converter
★ System Operating Modes
When the Chiller is turned off
Confluence
unit
Current converter
★ System Operating Modes
Confluence
unit
Current converter
When PV power generation is equal to AC power consumption:
★ System Operating Modes
Confluence
unit
Current converter
When PV power generation is more than AC power
consumption:
★ System Operating Modes
Confluence
unit
Current converter
When PV power generation is less than AC power
consumption:
★ System Operating Modes
Total Area 8000 m2
Type of PV plate Multicrystal silicon
Total capacity 803kWp
System name(System 1)
PV power generation
System for lighting
(System 2)
PV Direct-driven
Inverter Centrifugal
Chiller
Project area 4110m2 3890m2
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)
★ Typical Project Application
Enjoy GREEN Life with GREE AC