1 New absorption chillers for high efficient solar cooling systems Technische Universität Berlin • Institut für Energietechnik New absorption chillers for high efficient solar cooling systems Dipl.-Ing. Stefan Petersen & Dipl.-Ing. Jan Albers 1. General Technology Overview 2. Operating data 3. Solar cooling system layout 4. Showcase results Foto: TU Berlin Foto: TU Berlin
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New absorption chillers for high efficient solar cooling systems
Technische Universität Berlin • Institut für Energietechnik
New absorption chillers for high efficient solar cooling systemsDipl.-Ing. Stefan Petersen & Dipl.-Ing. Jan Albers
1. General Technology Overview2. Operating data3. Solar cooling system layout4. Showcase results
Foto: TU BerlinFoto: TU Berlin
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New absorption chillers for high efficient solar cooling systems
Technische Universität Berlin • Institut für Energietechnik
open cycles
Solar air-conditioning technologies
electrical systems thermal systems
- PV + Vapor compression chiller
- …heat transformation
processesthermomechanical
processes
- steam jet cycles
- rankine cycle + vapor compression chiller
- …
closed cycles
liquid sorbent
solid sorbent
absorption chiller
adsorption chiller
desiccant and evaporative cooling (DEC)
liquid sorbent
solid sorbent
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New absorption chillers for high efficient solar cooling systems
Technische Universität Berlin • Institut für Energietechnik
coolingwater
electric power
steam
steam
chilled water
vaporous refrigerant
condenser
evaporator
compressorrefrigerant throttle
liquid refrigerant
water-cooled vapor compression chiller [1]
[1] Carrier
Basics –compression chillerinner cycle
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New absorption chillers for high efficient solar cooling systems
Technische Universität Berlin • Institut für Energietechnik
cooling water
10 kW Phönix-absorption chiller-TU Berlin
evaporator
condenser
refrigerant
steam
Chilled water
refrigerantthrottle
steam
cooling water
diluted solution
hot water
concentrated solution
absorber
desorber
Basics – absorption chillerinner cycle
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New absorption chillers for high efficient solar cooling systems
Technische Universität Berlin • Institut für Energietechnik
Short general characteristic
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24 29 34 39 44 49Reject Heat Inlet Temperature [°C]
CO
P [-]
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0 , 8New 50 kW Chiller
High efficient10 kW
Coo
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Cap
acity
[kW
]
Nominal load
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New absorption chillers for high efficient solar cooling systems
Technische Universität Berlin • Institut für Energietechnik
System setup – thermal system configurationHeat transformation process
Basic system configurationStorage almost inevitable
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New absorption chillers for high efficient solar cooling systems
Technische Universität Berlin • Institut für Energietechnik
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50 60 70 80 90 100Heat Source Inlet temperature [°C]
New absorption chillers for high efficient solar cooling systems
Technische Universität Berlin • Institut für Energietechnik
Conclusion
Foto: TU Berlin
Development started in 2008 withcase studies and optimization:- Thermodynamic design- Manufacturing process- Cost efficiency
Final chiller concept fixed in 2009 Starting of pre-industrial manufacturing
and laboratory measurements in 2010 Installation of first prototypes
in Berlin and Dessau in 2011 Commercial launch in 2013:
- high energy efficiency (COP > 0,75)- high energy density and compactness- high cooling water temperatures > 45°C - low driving temperatures (tstart < 60°C)- low investment (~300 €/kW)