FRESNEL COLLECTORS FOR SOLAR THERMAL COOLING APPLICATIONS · 2018-12-09 · FRESNEL COLLECTORS FOR...
Transcript of FRESNEL COLLECTORS FOR SOLAR THERMAL COOLING APPLICATIONS · 2018-12-09 · FRESNEL COLLECTORS FOR...
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© Dipl.-Ing. Volker Rühle
FRESNEL COLLECTORS FOR SOLAR THERMAL COOLING APPLICATIONS
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25 % of all daily news are about natural disasters, saving energy and the necessity of reducing our carbon
footprint
HOWEVER: WHAT WE ARE DOING IN REALITY?
DEFINITELY NOT ENOUGH!!!
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Industrial Solar Fresnel collectors are designed to generate heat at 130 - 400 °C
250 - 450 °C
130 - 220 °C
90 - 130 °C
40 - 80 °C
„Process Heat“
Large PTC
and Fresnel
Small PTC
and Fresnel
Vacuum tube
CPC collectors
Flat plate collectors
Utility scale power generation
industrial process heat
Industrial process heat solar cooling
commercial water heating
distributed power generation
Solar cooling (single stage)
Low temperature process heat
Domestic water heating, space heating
TECHNOLOGY INTRODUCTION
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TECHNOLOGY BASIC PRINCIPLE
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Development since 1999
Set up of international subsidiaries, JVs
and cooperations for
• Sales
• Installation
• Assembly
• Procurement
PSE AG
• Spin off from Fraunhofer ISE, Freiburg, founded 1999, staff 68
• CEO Dr. Andreas Häberle, member of ESTTP (European Solar Thermal Technology Panel), DSTTP (German Solar Thermal Technology Platform) and expert for European Commission on CSP related research
• Business units: Solar test stands, solar consulting, solar conferences
• Board: Prof. V. Wittwer, Prof. E. Weber, Prof. J. Luther
Pilot-Experience since 2005 Commercialization since 2007
HISTORY FROM PSE TO MIROXX
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Width 7.5 m
Length of one module 4.06 m
Height 4.5 m
11 rows of primary mirrors
1 2 3 4
11 10
6 5
9 8 7
TECHNOLOGY BASIC PRINCIPLE
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• Low wind load
• Good weight-spread
• High ground usage factor
• No north-south alignment necessary compared to non-concentrating collectors
Best suited for rooftop installation
ADVANTAGES I FRESNEL VS. PARABOLIC SMALL SIZE
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ADVANTAGES I FRESNEL VS. PARABOLIC SMALL SIZE
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THERMAL FRESNEL PTC FRESNEL VS. PTC
PEAK POWER GROUND AREA
GROUND AREA GROUND USAGE FACTOR RATIO
88 kWth 264 m2 458 m2 1,73
176 kWth 528 m2 869 m2 1,65
500 kWth 1.500 m2 2.462 m2 1,64
1.0 MWth 3.000 m2 4.923 m2 1,64
10.0 MWth 30.000 m2 48.574 m2 1,62
ADVANTAGES I FRESNEL VS. PARABOLIC SMALL SIZE
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• Primary mirrors made of flat glass vs. aluminum (durability, reflectivity)
• Precise temperature and power control
• Less absorber tube per m² allows high quality 70 mm vacuum absorber tube (industrial standard)
• Remote control and monitoring via LAN and internet
Meets industry requirements
ADVANTAGES II
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Date: 2008/07/16
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8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00
Time (GMT +1h)
Tem
pera
ture
[°C
]
Po
wer
[kW
]
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<T>in-collector [°C] <T>out-collector [°C]
<T>ambient [°C] Collector Power [kW]
DNI (right axis) [W/m²]
Precise temperature control
ADVANTAGES II
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• Stationary receiver, no twisting of flexible connections
• Concentrated sunlight hits absorber tube always from below
Best suited for direct steam generation
Fresnel
Parabolic
ADVANTAGES III
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• Easy cleaning (flat glass/ good access)
• Low water demand for cleaning
• Reliable components
Low O&M
ADVANTAGES IV
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• Low wind load
• Good weight-spread
• High ground usage factor
• No north-south alignment necessary
• Stationary receiver, no flexivle connections
• Concentrated sunlight hits absorber tube always from below
Rooftop installation
Industry
Steam
• Easy cleaning (flat glass / good access)
• Low water demand for cleaning
• Reliable components (mirror/tube/drives)
Low O&M
• Primary mirrors made of flat glass vs. aluminum (durability, reflectivity)
• Precise temperature and power control
• Less absorber tube per m² allows high quality 70 mm vacuum absorber tube (industrial standard)
• Remote control and monitoring via LAN and internet
SUMMARY ADVANTAGES
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• Heat transfer fluid
– Pressurized water
– Steam
– Thermal oil
• Receiver SCHOTT PTR® 70
– Maximum pressure up to 120 bar (different versions 40, 60, 120 bar)
– Maximum temperature up to 380 °C with thermal oil up to 330 °C with saturated steam or pressurized water
– Thermal loss per m² of primary reflector u1 = 0.00043 W/(m²K²) (according to DLR)
FATCS & FIGURES
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Process Heat
Steam
Process heat
Cooling
Absorption Chillers
ORC-Turbines Steam Engines
Process Heat
Low temperature app.
Poly-Generation
APPLICATIONS
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MARKET
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• Peak load of electricity is already determined by air-conditioning demand in some areas
• At the same time, high solar gains may be utilised
Source: Fraunhofer ISE
MOTIVATION FOR SOLAR COOLING
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• Savings in primary energy consumption
• Reduction in peak electricity power demand
• Reduction in CO2 emissions
• Refrigerants without global warming potential; favorable: water
• All-season use of the solar thermal system: heating, cooling, domestic hot water
MOTIVATION FOR SOLAR COOLING
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Source: Henning, Fraunhofer ISE
SOLAR COOLING TECHNOLOGY
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Double effect
H2O/LiBr
Triple effect
H2O/LiBr
Single effect
NH3/H2O
Temperature lift (max)
25 K 25 K 55 K
Temperature of Cold 5-20°C 5-20°C -20°-20°C
Driving temperature 140-180°C 230-270°C 160-180°C
Max. COP 1,1-1,4 1,6-2,1 0,6-0,7
ABSORPTION CHILLERS
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fan
coils
absorpt.
chiller
ice
storage
dry
cooling
SOLAR COOLING WITH NH3-H2O CHILLER
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SOLAR COOLING WITH NH3-H2O CHILLER
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Collector
•16 modules, 352m² aperture area
•Pressurized water circuit at 16 bar
•Operating temperature 180 °C
Absorption chiller
• 2E water-LiBr
• Cooling capacity 174 kW
SOLAR COOLING WITH 2E WATER-LiBr
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• Built in 2007
• Aperture area 352 m²
• Pressurized water circuit at 16 bar
• Outlet temperature 180°C
• Double effect absorption chiller with 50 TR / 174 kW cooling capacity
SOLAR COOLING SYSTEM AT ESI IN SEVILLA
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Collector
• 64 modules, 1408m² aperture area
• Pressurized water circuit at 16 bar
• Operating temperature 180 °C
Absorption chiller
• 2E water-LiBr
• Cooling capacity 650 kW
SOLAR COOLING WITH 2E WATER-LiBr
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COMBINATION WITH RADIANT COOLING
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COMBINATION WITH RADIANT COOLING
0
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Operative (feeling) temperatur, °C
Lab
ou
r p
rod
ucti
vit
y,
%
Labour productivity as a function of operative (room) temperature
source:
Hettinger, Th.,
Kaminsky, G. ,
Schmale, H.:
Ergonomy at the work place
… which directly influences their labour efficiency
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COMBINATION WITH RADIANT COOLING
We all spend 90 % of the day time indoors: at work, commuting and at home
BUT:
WHAT IS COMFORT FOR US?
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COMBINATION WITH RADIANT COOLING
Reem Emirates Aluminum HQ, Abu Dhabi, UAE
•Radiant floor cooling 5 000m² •Central Air Handling Unit
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COMBINATION WITH RADIANT COOLING
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COMBINATION WITH RADIANT COOLING
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COMBINATION WITH RADIANT COOLING
GARDENS BY THE BAY SINGAPORE
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COMBINATION WITH RADIANT COOLING
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COMBINATION WITH RADIANT COOLING
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Why radiant cooling with solar cooling • We can use chilled water temperature
above 12 °C • PERFECT FOR ABSORPTION CHILLERS as the
capacity increase with higher chilled water leaving temperature (30 -50 % more capacity)
• Higher comfort, less O&M cost
• SUNTAINABILITY. LETS TAKE THIS RESPONSIBILITY.
COMBINATION WITH RADIANT COOLING
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COMBINATION WITH RADIANT COOLING
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© Dipl.-Ing. Volker Rühle
AL HAWAI TOWER 904 | SHEIKH ZAYED ROAD | P.O.BOX: 29717 DUBAI – UAE | T: +971 4 343 4004 | F: +971 4 321 4530
[email protected] | www. centrogulf.ae
Thank you for your attention.
Dipl.-Ing. Volker Rühle, Director Centrogulf LLC.