development of high efficiency solar cooling with...
TRANSCRIPT
Professor Yanjun DAISolar Energy Research CenterSolar Energy Research CenterShanghai Jiao Tong UniversityShanghai Jiao Tong University
Development of High Efficiency Solar Development of High Efficiency Solar Cooling with Medium TemperatureCooling with Medium Temperature
Solar CollectorSolar Collector
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Content
Introduction
Future activities
Recent development
Solar Cooling Technologies
1
2
3
4
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Solar thermal application in ChinaSolar thermal application in China
Solar thermal utilization in buildings
Hot waterHot water heatingheating coolingcooling Hybrid systemHybrid system
Technologies in use Demonstration and close to large scale application
The target technology
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STEP 1: Fundamentalresearch
SETP 2: Chiller products study
SETP 3: System integration optimization
Air cooled sorption chiller
Desiccant dehumidification unit
Adsorbent and desiccant performance study (such as silica gel-H2O, activated carbon-NH3, etc. )
Water saving sorption cooling system
Desiccant cooling system
Solar PV cooling system
Absorbent performance study (such as LiBr-H2O, NH3 -H2O, etc. )
Solar collector l and component study (such as new concept collector, etc. )
High efficiency heat transfers study
Solar Cooling Research in SJTU
Water saving sorption chiller
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Major technologies in SJTU
Adsorption chiller Adsorption ice making unitSingle effect LiBr-H2O
Rotary desiccant coolingTwo stage desiccant cooling
Single/Double effect LiBr-H2O
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Recent development
Solar assisted CO2 heat pump with air cooled absorption cooling;Solar driven single/double effect absorption cooling system with Fresnel collectorSolar driven double effect absorption cooling with parabolic collectorDesiccant chiller driven by solar air collectorUse of desiccant coating technology in solar air conditioning.Solar combined cooling and heating
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I. Solar assisted CO2 heat pump
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System configuration
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System performance
Comparison of two refrigeration cycles of proposed CO2 heat pump on p-h diagram
Comparison between experiential and simulation results in hybrid mode
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II. Solar driven single/double effect absorption cooling system with Fresnel collector
Single / double effect absorption coolingpiping
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Fresnel solar collector
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Solar cooling in Shanghai Electric Co.
MM
M
M
M
MV1 MV2
MV5
MV6MV7
T1
T7T5
T8
T9
T10
T15
T16
T17
T19 T20
T18
T22
T21
F2F1
P2
M MV3
T3
T4T2
M
MV4
P1
P6
P3 F3
T11
T12 T14
T13
P4 F4
DN50
DN50
DN65
DN65 DN65
DN65
DN50
DN50
SV1 SV3
SV2 SV4
SV11 SV12
SV13
SV14
SV16
SV15
SV7 SV8
SV5 SV6
SV17
SV47
SV44 SV45
SV51
SV25
SV23 SV24
SV26
SV27
DN20SV9
DN20SV10
SV19
SV20
SV21
SV22
DN50
DN50
DN50
DN50
SV39SV38
SV30 SV28 SV36 SV29 SV37 SV31
DN50 DN50
SV32 SV33
SV42 SV43
SV41
SV40
SV34 SV35
DN65
DN65
SV56
DN80
DN80
DN50
DN50
SV49
SV50
SV48
SV46
DN25
DN25
DN25DN25
DN25
SV53
SV54 SV55
SV52
YF2
YF1
YF6
YF3
YF5
YF4
T6
NV1
NV2
NV1
NV3
NV5
NV4
550 m2 Fresnel solar collector;(150~200℃ Salt thermal energy storage (PCM, 146℃) Double/Single effect absorption chiller(100kW )
Solar fresnel collector Single/double effect
absorption chiller
Molten salt energy storage
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double effect Single effect
Cooling capacity 134 kW 91 kW
Hot water
Flow rate 11.0 m3/h
Inlet/Outlet Temp. 150 /140 oC 105/95 oC
Cold water
Flow rate 23.0 m3/h
Inlet/Outlet Temp. 12/7 oC 12/8.4 oC
Cooling
water
Flow rate 44 m3/h
Inlet/Outlet Temp. 31/36 oC 31/35.3 oCSingle/double LiBr-H2O
chiller
Single/double LiBr-H2O chiller
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8 10 12 14 160
50
100
150
200
Am
bien
t Tem
p. (o C
)
Local Time (hours)
Ambient Temp. Thermal Oil Outlet Temp. Thermal Oil Inlet Temp.
0
200
400
600
800
Dire
ct R
adia
tion
(W/m
2)
Direct Radiation
8 10 12 14 160.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Single Effect Model
Single Effect Model
CO
P
Local Time (hours)
COPDouble Effect Model
Under sunny days,double effect mode from 10am -14 pmSingle effect mode for the other time.Daily average COP is about 0.8Cooling production for 6-8 hours
Performance analysis
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Single/double effect LiBr-H2O Chiller(Changle Shandong)
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III. Solar driven double effect absorption cooling with parabolic collector
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System Performance Daily solar thermal efficiency of the collector is about 40%。
Temperature increase is about 12-15℃。
COP is about 1.0。
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• Solar driven hybrid Air cooled absorption chiller + VC air conditioning system
• Trough collector is about 135 m2
• About 25kW air cooled absorption chiller
• Vanke real estate Co. , research center
Solar driven air cooled absorption cooling
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Solar driven air cooled absorption cooling
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iV. A novel chiller with desiccant dehumidification and regenerative evaporative cooling
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System Operation
Dehumidification subsystem (DS)
• process air cycle:1-2-3-4-5
• Regeneration air cycle:11-12-13-14-1511-12-16-17-18
REC subsystem (RS)• dry air for producing
chilled water cycle:5-6-7-8
• reused air cycle:8-9-10
• process air cycle:5-9-10
0 10 20 30 40 50 60 70 80 900.000
0.005
0.010
0.015
0.020
0.025
0.030
0.035
11
109
2%
13
87
6
16
15
12 5%1%
Hum
idity
ratio
(kg/
kg)
10%20
%40%
60%
80%
100%
Dry bulb temperature (oC)
18
14(17)1
23
45
Latent load removed by DS
Sensible load removed by RS
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Performance in producing chilling water
1 2 3 4 5 6 7 8 9 1015
30
45
60
75
90
Tem
pera
ture
(o C)
No.
5
10
15
20
25
30
Tamb
damb
Hum
idity
ratio
(g/k
g)
Treg
(a)
1 2 3 4 5 6 7 8 9 1010
15
20
25
30
15 oC
18 oC
Tw,ret
Tem
pera
ture
(o C)
No.
Tw,sup
(b)
20 oC
1 2 3 4 5 6 7 8 9 100.0
0.2
0.4
0.6
0.8
CO
Pth
,w
No.
(c)
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18 20 22 24 26 28 30 32 34 360.006
0.009
0.012
0.015
0.018
0.021
0.024
Tw,ave=18.7 oC Qualified supply air
High humid
20%
Ambient conditions
Conventional cycle
60%
30%
100%
Hum
idity
ratio
(kg/
kg)
70%
40%
80%
50%
90%
Dry bulb temperature (oC)
Novel cycle Rdis=0.375
Comparison between the supply air condition of the novel cycle and that of the conventional cycle under high humid climate (1130.6 m3/h, 674.2 m3/h, 1.04 m3/h, July 22, 2011)
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V. Desiccant heat exchanger units
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0 10 20 30 40 50 60 70 80 90 1000.000
0.005
0.010
0.015
0.020
0.025
0.030
0.035
0.040
1%
SCHE A in dehumidification process SCHE A in regeneration process SCHE B in dehumidification process SCHE B in regeneration process
2%
5%
Hum
idity
ratio
(kg/
kg)
10%20
%
40%
60%
80%
100%
Dry bulb temperature (oC)
Dynamic analysis of two SCHEs in one cycle
200 400 600 800 1000 12003.0
3.5
4.0
4.5
5.0
5.5
6.0
Average Moisture Removal COP
Time (sec)
Ave
rage
Moi
stur
e R
emov
al (g
/kg)
0.20
0.25
0.30
0.35
0.40
0.45
0.50
Ambient Air Humidity Ratio: 15-16 g/kgRegeneration Hot Water Temperature: 80-85 oC
CO
P
Effect of cycle time on average moisture removal and COPth
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Solar heating and cooling system in Auhua Co., Ltd.
3F integration building (3层综合楼)
7F Office building (7层办公楼)
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System design (Sino – Denmark joint Project)
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50kW adsorption chiller
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80kW desiccant cooling system
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Green Energy Lab (GEL)
Gold Medel – LEED certification
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Solar driven adsorption chiller
60 m2 heat pipe solar collector15-20kW adsorption chillerCooling ceiling
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Radiant cooling
Chilled water 15℃,radiant coolingCOP is about 0.5.
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CPC solar collector + absorption chiller
CPC solar collector, 110~130℃.LiBr-H2O ChillerCapacity: 17kW
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Solar ice making system
Solar trough collector:130-150℃Adsorption ice makerCOP=0.3
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Solar air conditioning system in GEL
Solar adsorption cooling
Desiccant cooling Solar assisted CO2 heat pump
Micro CCHPWater resource heat pump
Main system
Ground source heat pump
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Solar PV cooling
Lennox
PV air conditioning becomes more competitive with the PV cost goes down.
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Medium temperature solar collector
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Solar Fresnel Collector
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Novel solar collector
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Factory of solar cooling machine
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Future ActivitiesCompact solar adsorption chiller
• Silica Gel- H2O, 5,10,20,50 kW• Chemical adsorption ice making unit• Multi slats and multi effect sorption cooling
Efficient desiccant dehumidification and cooling• Desiccant wheel• Desiccant coating • Advanced materials
Multi effects absorption coolingSolar collector and Thermal storageSolar combined system and simulation
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Thanks for your attention
谢 谢!